// Copyright 2020-2023 The NATS Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package server
import (
"bytes"
"encoding/binary"
"encoding/json"
"errors"
"fmt"
"math"
"math/rand"
"os"
"path/filepath"
"reflect"
"sort"
"strings"
"sync/atomic"
"time"
"github.com/klauspost/compress/s2"
"github.com/minio/highwayhash"
"github.com/nats-io/nuid"
)
// jetStreamCluster holds information about the meta group and stream assignments.
type jetStreamCluster struct {
// The metacontroller raftNode.
meta RaftNode
// For stream and consumer assignments. All servers will have this be the same.
// ACCOUNT -> STREAM -> Stream Assignment -> Consumers
streams map[string]map[string]*streamAssignment
// These are inflight proposals and used to apply limits when there are
// concurrent requests that would otherwise be accepted.
// We also record the group for the stream. This is needed since if we have
// concurrent requests for same account and stream we need to let it process to get
// a response but they need to be same group, peers etc.
inflight map[string]map[string]*raftGroup
// Signals meta-leader should check the stream assignments.
streamsCheck bool
// Server.
s *Server
// Internal client.
c *client
// Processing assignment results.
streamResults *subscription
consumerResults *subscription
// System level request to have the leader stepdown.
stepdown *subscription
// System level requests to remove a peer.
peerRemove *subscription
// System level request to move a stream
peerStreamMove *subscription
// System level request to cancel a stream move
peerStreamCancelMove *subscription
// To pop out the monitorCluster before the raft layer.
qch chan struct{}
}
// Used to guide placement of streams and meta controllers in clustered JetStream.
type Placement struct {
Cluster string `json:"cluster,omitempty"`
Tags []string `json:"tags,omitempty"`
}
// Define types of the entry.
type entryOp uint8
// ONLY ADD TO THE END, DO NOT INSERT IN BETWEEN WILL BREAK SERVER INTEROP.
const (
// Meta ops.
assignStreamOp entryOp = iota
assignConsumerOp
removeStreamOp
removeConsumerOp
// Stream ops.
streamMsgOp
purgeStreamOp
deleteMsgOp
// Consumer ops.
updateDeliveredOp
updateAcksOp
// Compressed consumer assignments.
assignCompressedConsumerOp
// Filtered Consumer skip.
updateSkipOp
// Update Stream.
updateStreamOp
// For updating information on pending pull requests.
addPendingRequest
removePendingRequest
// For sending compressed streams, either through RAFT or catchup.
compressedStreamMsgOp
)
// raftGroups are controlled by the metagroup controller.
// The raftGroups will house streams and consumers.
type raftGroup struct {
Name string `json:"name"`
Peers []string `json:"peers"`
Storage StorageType `json:"store"`
Cluster string `json:"cluster,omitempty"`
Preferred string `json:"preferred,omitempty"`
// Internal
node RaftNode
}
// streamAssignment is what the meta controller uses to assign streams to peers.
type streamAssignment struct {
Client *ClientInfo `json:"client,omitempty"`
Created time.Time `json:"created"`
Config *StreamConfig `json:"stream"`
Group *raftGroup `json:"group"`
Sync string `json:"sync"`
Subject string `json:"subject"`
Reply string `json:"reply"`
Restore *StreamState `json:"restore_state,omitempty"`
// Internal
consumers map[string]*consumerAssignment
responded bool
recovering bool
err error
}
// consumerAssignment is what the meta controller uses to assign consumers to streams.
type consumerAssignment struct {
Client *ClientInfo `json:"client,omitempty"`
Created time.Time `json:"created"`
Name string `json:"name"`
Stream string `json:"stream"`
Config *ConsumerConfig `json:"consumer"`
Group *raftGroup `json:"group"`
Subject string `json:"subject"`
Reply string `json:"reply"`
State *ConsumerState `json:"state,omitempty"`
// Internal
responded bool
recovering bool
deleted bool
err error
}
// streamPurge is what the stream leader will replicate when purging a stream.
type streamPurge struct {
Client *ClientInfo `json:"client,omitempty"`
Stream string `json:"stream"`
LastSeq uint64 `json:"last_seq"`
Subject string `json:"subject"`
Reply string `json:"reply"`
Request *JSApiStreamPurgeRequest `json:"request,omitempty"`
}
// streamMsgDelete is what the stream leader will replicate when deleting a message.
type streamMsgDelete struct {
Client *ClientInfo `json:"client,omitempty"`
Stream string `json:"stream"`
Seq uint64 `json:"seq"`
NoErase bool `json:"no_erase,omitempty"`
Subject string `json:"subject"`
Reply string `json:"reply"`
}
const (
defaultStoreDirName = "_js_"
defaultMetaGroupName = "_meta_"
defaultMetaFSBlkSize = 1024 * 1024
jsExcludePlacement = "!jetstream"
)
// Returns information useful in mixed mode.
func (s *Server) trackedJetStreamServers() (js, total int) {
s.mu.RLock()
defer s.mu.RUnlock()
if !s.running || !s.eventsEnabled() {
return -1, -1
}
s.nodeToInfo.Range(func(k, v interface{}) bool {
si := v.(nodeInfo)
if si.js {
js++
}
total++
return true
})
return js, total
}
func (s *Server) getJetStreamCluster() (*jetStream, *jetStreamCluster) {
s.mu.RLock()
shutdown, js := s.shutdown, s.js
s.mu.RUnlock()
if shutdown || js == nil {
return nil, nil
}
// Only set once, do not need a lock.
return js, js.cluster
}
func (s *Server) JetStreamIsClustered() bool {
js := s.getJetStream()
if js == nil {
return false
}
return js.isClustered()
}
func (s *Server) JetStreamIsLeader() bool {
js := s.getJetStream()
if js == nil {
return false
}
js.mu.RLock()
defer js.mu.RUnlock()
return js.cluster.isLeader()
}
func (s *Server) JetStreamIsCurrent() bool {
js := s.getJetStream()
if js == nil {
return false
}
js.mu.RLock()
defer js.mu.RUnlock()
return js.cluster.isCurrent()
}
func (s *Server) JetStreamSnapshotMeta() error {
js := s.getJetStream()
if js == nil {
return NewJSNotEnabledError()
}
js.mu.RLock()
cc := js.cluster
isLeader := cc.isLeader()
meta := cc.meta
js.mu.RUnlock()
if !isLeader {
return errNotLeader
}
return meta.InstallSnapshot(js.metaSnapshot())
}
func (s *Server) JetStreamStepdownStream(account, stream string) error {
js, cc := s.getJetStreamCluster()
if js == nil {
return NewJSNotEnabledError()
}
if cc == nil {
return NewJSClusterNotActiveError()
}
// Grab account
acc, err := s.LookupAccount(account)
if err != nil {
return err
}
// Grab stream
mset, err := acc.lookupStream(stream)
if err != nil {
return err
}
if node := mset.raftNode(); node != nil && node.Leader() {
node.StepDown()
}
return nil
}
func (s *Server) JetStreamStepdownConsumer(account, stream, consumer string) error {
js, cc := s.getJetStreamCluster()
if js == nil {
return NewJSNotEnabledError()
}
if cc == nil {
return NewJSClusterNotActiveError()
}
// Grab account
acc, err := s.LookupAccount(account)
if err != nil {
return err
}
// Grab stream
mset, err := acc.lookupStream(stream)
if err != nil {
return err
}
o := mset.lookupConsumer(consumer)
if o == nil {
return NewJSConsumerNotFoundError()
}
if node := o.raftNode(); node != nil && node.Leader() {
node.StepDown()
}
return nil
}
func (s *Server) JetStreamSnapshotStream(account, stream string) error {
js, cc := s.getJetStreamCluster()
if js == nil {
return NewJSNotEnabledForAccountError()
}
if cc == nil {
return NewJSClusterNotActiveError()
}
// Grab account
acc, err := s.LookupAccount(account)
if err != nil {
return err
}
// Grab stream
mset, err := acc.lookupStream(stream)
if err != nil {
return err
}
mset.mu.RLock()
if !mset.node.Leader() {
mset.mu.RUnlock()
return NewJSNotEnabledForAccountError()
}
n := mset.node
mset.mu.RUnlock()
return n.InstallSnapshot(mset.stateSnapshot())
}
func (s *Server) JetStreamClusterPeers() []string {
js := s.getJetStream()
if js == nil {
return nil
}
js.mu.RLock()
defer js.mu.RUnlock()
cc := js.cluster
if !cc.isLeader() {
return nil
}
peers := cc.meta.Peers()
var nodes []string
for _, p := range peers {
si, ok := s.nodeToInfo.Load(p.ID)
if !ok || si == nil {
continue
}
ni := si.(nodeInfo)
// Ignore if offline, no JS, or no current stats have been received.
if ni.offline || !ni.js || ni.stats == nil {
continue
}
nodes = append(nodes, si.(nodeInfo).name)
}
return nodes
}
// Read lock should be held.
func (cc *jetStreamCluster) isLeader() bool {
if cc == nil {
// Non-clustered mode
return true
}
return cc.meta != nil && cc.meta.Leader()
}
// isCurrent will determine if this node is a leader or an up to date follower.
// Read lock should be held.
func (cc *jetStreamCluster) isCurrent() bool {
if cc == nil {
// Non-clustered mode
return true
}
if cc.meta == nil {
return false
}
return cc.meta.Current()
}
// isStreamCurrent will determine if the stream is up to date.
// For R1 it will make sure the stream is present on this server.
// Read lock should be held.
func (cc *jetStreamCluster) isStreamCurrent(account, stream string) bool {
if cc == nil {
// Non-clustered mode
return true
}
as := cc.streams[account]
if as == nil {
return false
}
sa := as[stream]
if sa == nil {
return false
}
rg := sa.Group
if rg == nil {
return false
}
if rg.node == nil || rg.node.Current() {
// Check if we are processing a snapshot and are catching up.
acc, err := cc.s.LookupAccount(account)
if err != nil {
return false
}
mset, err := acc.lookupStream(stream)
if err != nil {
return false
}
if mset.isCatchingUp() {
return false
}
// Success.
return true
}
return false
}
// isStreamHealthy will determine if the stream is up to date or very close.
// For R1 it will make sure the stream is present on this server.
// Read lock should be held.
func (cc *jetStreamCluster) isStreamHealthy(account, stream string) bool {
if cc == nil {
// Non-clustered mode
return true
}
as := cc.streams[account]
if as == nil {
return false
}
sa := as[stream]
if sa == nil {
return false
}
rg := sa.Group
if rg == nil {
return false
}
if rg.node == nil || rg.node.Healthy() {
// Check if we are processing a snapshot and are catching up.
acc, err := cc.s.LookupAccount(account)
if err != nil {
return false
}
mset, err := acc.lookupStream(stream)
if err != nil {
return false
}
if mset.isCatchingUp() {
return false
}
// Success.
return true
}
return false
}
// isConsumerCurrent will determine if the consumer is up to date.
// For R1 it will make sure the consunmer is present on this server.
// Read lock should be held.
func (cc *jetStreamCluster) isConsumerCurrent(account, stream, consumer string) bool {
if cc == nil {
// Non-clustered mode
return true
}
acc, err := cc.s.LookupAccount(account)
if err != nil {
return false
}
mset, err := acc.lookupStream(stream)
if err != nil {
return false
}
o := mset.lookupConsumer(consumer)
if o == nil {
return false
}
if n := o.raftNode(); n != nil && !n.Current() {
return false
}
return true
}
// subjectsOverlap checks all existing stream assignments for the account cross-cluster for subject overlap
// Use only for clustered JetStream
// Read lock should be held.
func (jsc *jetStreamCluster) subjectsOverlap(acc string, subjects []string, osa *streamAssignment) bool {
asa := jsc.streams[acc]
for _, sa := range asa {
// can"t overlap yourself, assume osa pre-checked for deep equal if passed
if osa != nil && sa == osa {
continue
}
for _, subj := range sa.Config.Subjects {
for _, tsubj := range subjects {
if SubjectsCollide(tsubj, subj) {
return true
}
}
}
}
return false
}
func (a *Account) getJetStreamFromAccount() (*Server, *jetStream, *jsAccount) {
a.mu.RLock()
jsa := a.js
a.mu.RUnlock()
if jsa == nil {
return nil, nil, nil
}
jsa.mu.RLock()
js := jsa.js
jsa.mu.RUnlock()
if js == nil {
return nil, nil, nil
}
js.mu.RLock()
s := js.srv
js.mu.RUnlock()
return s, js, jsa
}
func (s *Server) JetStreamIsStreamLeader(account, stream string) bool {
js, cc := s.getJetStreamCluster()
if js == nil || cc == nil {
return false
}
js.mu.RLock()
defer js.mu.RUnlock()
return cc.isStreamLeader(account, stream)
}
func (a *Account) JetStreamIsStreamLeader(stream string) bool {
s, js, jsa := a.getJetStreamFromAccount()
if s == nil || js == nil || jsa == nil {
return false
}
js.mu.RLock()
defer js.mu.RUnlock()
return js.cluster.isStreamLeader(a.Name, stream)
}
func (s *Server) JetStreamIsStreamCurrent(account, stream string) bool {
js, cc := s.getJetStreamCluster()
if js == nil {
return false
}
js.mu.RLock()
defer js.mu.RUnlock()
return cc.isStreamCurrent(account, stream)
}
func (a *Account) JetStreamIsConsumerLeader(stream, consumer string) bool {
s, js, jsa := a.getJetStreamFromAccount()
if s == nil || js == nil || jsa == nil {
return false
}
js.mu.RLock()
defer js.mu.RUnlock()
return js.cluster.isConsumerLeader(a.Name, stream, consumer)
}
func (s *Server) JetStreamIsConsumerLeader(account, stream, consumer string) bool {
js, cc := s.getJetStreamCluster()
if js == nil || cc == nil {
return false
}
js.mu.RLock()
defer js.mu.RUnlock()
return cc.isConsumerLeader(account, stream, consumer)
}
func (s *Server) enableJetStreamClustering() error {
if !s.isRunning() {
return nil
}
js := s.getJetStream()
if js == nil {
return NewJSNotEnabledForAccountError()
}
// Already set.
if js.cluster != nil {
return nil
}
s.Noticef("Starting JetStream cluster")
// We need to determine if we have a stable cluster name and expected number of servers.
s.Debugf("JetStream cluster checking for stable cluster name and peers")
hasLeafNodeSystemShare := s.canExtendOtherDomain()
if s.isClusterNameDynamic() && !hasLeafNodeSystemShare {
return errors.New("JetStream cluster requires cluster name")
}
if s.configuredRoutes() == 0 && !hasLeafNodeSystemShare {
return errors.New("JetStream cluster requires configured routes or solicited leafnode for the system account")
}
return js.setupMetaGroup()
}
// isClustered returns if we are clustered.
// Lock should not be held.
func (js *jetStream) isClustered() bool {
// This is only ever set, no need for lock here.
return js.cluster != nil
}
// isClusteredNoLock returns if we are clustered, but unlike isClustered() does
// not use the jetstream"s lock, instead, uses an atomic operation.
// There are situations where some code wants to know if we are clustered but
// can"t use js.isClustered() without causing a lock inversion.
func (js *jetStream) isClusteredNoLock() bool {
return atomic.LoadInt32(&js.clustered) == 1
}
func (js *jetStream) setupMetaGroup() error {
s := js.srv
s.Noticef("Creating JetStream metadata controller")
// Setup our WAL for the metagroup.
sysAcc := s.SystemAccount()
storeDir := filepath.Join(js.config.StoreDir, sysAcc.Name, defaultStoreDirName, defaultMetaGroupName)
fs, err := newFileStoreWithCreated(
FileStoreConfig{StoreDir: storeDir, BlockSize: defaultMetaFSBlkSize, AsyncFlush: false},
StreamConfig{Name: defaultMetaGroupName, Storage: FileStorage},
time.Now().UTC(),
s.jsKeyGen(defaultMetaGroupName),
)
if err != nil {
s.Errorf("Error creating filestore: %v", err)
return err
}
cfg := &RaftConfig{Name: defaultMetaGroupName, Store: storeDir, Log: fs}
// If we are soliciting leafnode connections and we are sharing a system account and do not disable it with a hint,
// we want to move to observer mode so that we extend the solicited cluster or supercluster but do not form our own.
cfg.Observer = s.canExtendOtherDomain() && s.opts.JetStreamExtHint != jsNoExtend
var bootstrap bool
if ps, err := readPeerState(storeDir); err != nil {
s.Noticef("JetStream cluster bootstrapping")
bootstrap = true
peers := s.ActivePeers()
s.Debugf("JetStream cluster initial peers: %+v", peers)
if err := s.bootstrapRaftNode(cfg, peers, false); err != nil {
return err
}
if cfg.Observer {
s.Noticef("Turning JetStream metadata controller Observer Mode on")
}
} else {
s.Noticef("JetStream cluster recovering state")
// correlate the value of observer with observations from a previous run.
if cfg.Observer {
switch ps.domainExt {
case extExtended:
s.Noticef("Keeping JetStream metadata controller Observer Mode on - due to previous contact")
case extNotExtended:
s.Noticef("Turning JetStream metadata controller Observer Mode off - due to previous contact")
cfg.Observer = false
case extUndetermined:
s.Noticef("Turning JetStream metadata controller Observer Mode on - no previous contact")
s.Noticef("In cases where JetStream will not be extended")
s.Noticef("and waiting for leader election until first contact is not acceptable,")
s.Noticef(`manually disable Observer Mode by setting the JetStream Option "extension_hint: %s"`, jsNoExtend)
}
} else {
// To track possible configuration changes, responsible for an altered value of cfg.Observer,
// set extension state to undetermined.
ps.domainExt = extUndetermined
if err := writePeerState(storeDir, ps); err != nil {
return err
}
}
}
// Start up our meta node.
n, err := s.startRaftNode(sysAcc.GetName(), cfg)
if err != nil {
s.Warnf("Could not start metadata controller: %v", err)
return err
}
// If we are bootstrapped with no state, start campaign early.
if bootstrap {
n.Campaign()
}
c := s.createInternalJetStreamClient()
sacc := s.SystemAccount()
js.mu.Lock()
defer js.mu.Unlock()
js.cluster = &jetStreamCluster{
meta: n,
streams: make(map[string]map[string]*streamAssignment),
s: s,
c: c,
qch: make(chan struct{}),
}
atomic.StoreInt32(&js.clustered, 1)
c.registerWithAccount(sacc)
js.srv.startGoRoutine(js.monitorCluster)
return nil
}
func (js *jetStream) getMetaGroup() RaftNode {
js.mu.RLock()
defer js.mu.RUnlock()
if js.cluster == nil {
return nil
}
return js.cluster.meta
}
func (js *jetStream) server() *Server {
js.mu.RLock()
s := js.srv
js.mu.RUnlock()
return s
}
// Will respond if we do not think we have a metacontroller leader.
func (js *jetStream) isLeaderless() bool {
js.mu.RLock()
defer js.mu.RUnlock()
cc := js.cluster
if cc == nil || cc.meta == nil {
return false
}
// If we don"t have a leader.
// Make sure we have been running for enough time.
if cc.meta.GroupLeader() == _EMPTY_ && time.Since(cc.meta.Created()) > lostQuorumIntervalDefault {
return true
}
return false
}
// Will respond iff we are a member and we know we have no leader.
func (js *jetStream) isGroupLeaderless(rg *raftGroup) bool {
if rg == nil || js == nil {
return false
}
js.mu.RLock()
defer js.mu.RUnlock()
cc := js.cluster
// If we are not a member we can not say..
if cc.meta == nil {
return false
}
if !rg.isMember(cc.meta.ID()) {
return false
}
// Single peer groups always have a leader if we are here.
if rg.node == nil {
return false
}
// If we don"t have a leader.
if rg.node.GroupLeader() == _EMPTY_ {
// Threshold for jetstream startup.
const startupThreshold = 5 * time.Second
if rg.node.HadPreviousLeader() {
// Make sure we have been running long enough to intelligently determine this.
if time.Since(js.started) > startupThreshold {
return true
}
}
// Make sure we have been running for enough time.
if time.Since(rg.node.Created()) > lostQuorumIntervalDefault {
return true
}
}
return false
}
func (s *Server) JetStreamIsStreamAssigned(account, stream string) bool {
js, cc := s.getJetStreamCluster()
if js == nil || cc == nil {
return false
}
acc, _ := s.LookupAccount(account)
if acc == nil {
return false
}
js.mu.RLock()
assigned := cc.isStreamAssigned(acc, stream)
js.mu.RUnlock()
return assigned
}
// streamAssigned informs us if this server has this stream assigned.
func (jsa *jsAccount) streamAssigned(stream string) bool {
jsa.mu.RLock()
js, acc := jsa.js, jsa.account
jsa.mu.RUnlock()
if js == nil {
return false
}
js.mu.RLock()
assigned := js.cluster.isStreamAssigned(acc, stream)
js.mu.RUnlock()
return assigned
}
// Read lock should be held.
func (cc *jetStreamCluster) isStreamAssigned(a *Account, stream string) bool {
// Non-clustered mode always return true.
if cc == nil {
return true
}
if cc.meta == nil {
return false
}
as := cc.streams[a.Name]
if as == nil {
return false
}
sa := as[stream]
if sa == nil {
return false
}
rg := sa.Group
if rg == nil {
return false
}
// Check if we are the leader of this raftGroup assigned to the stream.
ourID := cc.meta.ID()
for _, peer := range rg.Peers {
if peer == ourID {
return true
}
}
return false
}
// Read lock should be held.
func (cc *jetStreamCluster) isStreamLeader(account, stream string) bool {
// Non-clustered mode always return true.
if cc == nil {
return true
}
if cc.meta == nil {
return false
}
var sa *streamAssignment
if as := cc.streams[account]; as != nil {
sa = as[stream]
}
if sa == nil {
return false
}
rg := sa.Group
if rg == nil {
return false
}
// Check if we are the leader of this raftGroup assigned to the stream.
ourID := cc.meta.ID()
for _, peer := range rg.Peers {
if peer == ourID {
if len(rg.Peers) == 1 || rg.node != nil && rg.node.Leader() {
return true
}
}
}
return false
}
// Read lock should be held.
func (cc *jetStreamCluster) isConsumerLeader(account, stream, consumer string) bool {
// Non-clustered mode always return true.
if cc == nil {
return true
}
if cc.meta == nil {
return false
}
var sa *streamAssignment
if as := cc.streams[account]; as != nil {
sa = as[stream]
}
if sa == nil {
return false
}
// Check if we are the leader of this raftGroup assigned to this consumer.
ca := sa.consumers[consumer]
if ca == nil {
return false
}
rg := ca.Group
ourID := cc.meta.ID()
for _, peer := range rg.Peers {
if peer == ourID {
if len(rg.Peers) == 1 || (rg.node != nil && rg.node.Leader()) {
return true
}
}
}
return false
}
// Remove the stream `streamName` for the account `accName` from the inflight
// proposals map. This is done on success (processStreamAssignment) or on
// failure (processStreamAssignmentResults).
// (Write) Lock held on entry.
func (cc *jetStreamCluster) removeInflightProposal(accName, streamName string) {
streams, ok := cc.inflight[accName]
if !ok {
return
}
delete(streams, streamName)
if len(streams) == 0 {
delete(cc.inflight, accName)
}
}
// Return the cluster quit chan.
func (js *jetStream) clusterQuitC() chan struct{} {
js.mu.RLock()
defer js.mu.RUnlock()
if js.cluster != nil {
return js.cluster.qch
}
return nil
}
// Mark that the meta layer is recovering.
func (js *jetStream) setMetaRecovering() {
js.mu.Lock()
defer js.mu.Unlock()
if js.cluster != nil {
// metaRecovering
js.metaRecovering = true
}
}
// Mark that the meta layer is no longer recovering.
func (js *jetStream) clearMetaRecovering() {
js.mu.Lock()
defer js.mu.Unlock()
js.metaRecovering = false
}
// Return whether the meta layer is recovering.
func (js *jetStream) isMetaRecovering() bool {
js.mu.RLock()
defer js.mu.RUnlock()
return js.metaRecovering
}
// During recovery track any stream and consumer delete and update operations.
type recoveryUpdates struct {
removeStreams map[string]*streamAssignment
removeConsumers map[string]*consumerAssignment
updateStreams map[string]*streamAssignment
updateConsumers map[string]*consumerAssignment
}
// Called after recovery of the cluster on startup to check for any orphans.
// Streams and consumers are recovered from disk, and the meta layer"s mappings
// should clean them up, but under crash scenarios there could be orphans.
func (js *jetStream) checkForOrphans() {
consumerName := func(o *consumer) string {
o.mu.RLock()
defer o.mu.RUnlock()
return o.name
}
// Can not hold jetstream lock while trying to delete streams or consumers.
js.mu.Lock()
s, cc := js.srv, js.cluster
s.Debugf("JetStream cluster checking for orphans")
var streams []*stream
var consumers []*consumer
for accName, jsa := range js.accounts {
asa := cc.streams[accName]
for stream, mset := range jsa.streams {
if sa := asa[stream]; sa == nil {
streams = append(streams, mset)
} else {
// This one is good, check consumers now.
for _, o := range mset.getConsumers() {
consumer := consumerName(o)
if sa.consumers[consumer] == nil {
consumers = append(consumers, o)
}
}
}
}
}
js.mu.Unlock()
for _, mset := range streams {
mset.mu.RLock()
accName, stream := mset.acc.Name, mset.cfg.Name
mset.mu.RUnlock()
s.Warnf("Detected orphaned stream "%s > %s", will cleanup", accName, stream)
if err := mset.delete(); err != nil {
s.Warnf("Deleting stream encountered an error: %v", err)
}
}
for _, o := range consumers {
o.mu.RLock()
accName, mset, consumer := o.acc.Name, o.mset, o.name
o.mu.RUnlock()
stream := "N/A"
if mset != nil {
mset.mu.RLock()
stream = mset.cfg.Name
mset.mu.RUnlock()
}
s.Warnf("Detected orphaned consumer "%s > %s > %s", will cleanup", accName, stream, consumer)
if err := o.delete(); err != nil {
s.Warnf("Deleting consumer encountered an error: %v", err)
}
}
}
func (js *jetStream) monitorCluster() {
s, n := js.server(), js.getMetaGroup()
qch, rqch, lch, aq := js.clusterQuitC(), n.QuitC(), n.LeadChangeC(), n.ApplyQ()
defer s.grWG.Done()
s.Debugf("Starting metadata monitor")
defer s.Debugf("Exiting metadata monitor")
// Make sure to stop the raft group on exit to prevent accidental memory bloat.
defer n.Stop()
const compactInterval = 2 * time.Minute
t := time.NewTicker(compactInterval)
defer t.Stop()
// Used to check cold boot cluster when possibly in mixed mode.
const leaderCheckInterval = time.Second
lt := time.NewTicker(leaderCheckInterval)
defer lt.Stop()
var (
isLeader bool
lastSnap []byte
lastSnapTime time.Time
minSnapDelta = 10 * time.Second
)
// Highwayhash key for generating hashes.
key := make([]byte, 32)
rand.Read(key)
// Set to true to start.
js.setMetaRecovering()
// Snapshotting function.
doSnapshot := func() {
// Suppress during recovery.
if js.isMetaRecovering() {
return
}
snap := js.metaSnapshot()
if hash := highwayhash.Sum(snap, key); !bytes.Equal(hash[:], lastSnap) {
if err := n.InstallSnapshot(snap); err == nil {
lastSnap, lastSnapTime = hash[:], time.Now()
} else if err != errNoSnapAvailable && err != errNodeClosed {
s.Warnf("Error snapshotting JetStream cluster state: %v", err)
}
}
}
ru := &recoveryUpdates{
removeStreams: make(map[string]*streamAssignment),
removeConsumers: make(map[string]*consumerAssignment),
updateStreams: make(map[string]*streamAssignment),
updateConsumers: make(map[string]*consumerAssignment),
}
for {
select {
case <-s.quitCh:
return
case <-rqch:
return
case <-qch:
// Clean signal from shutdown routine so do best effort attempt to snapshot meta layer.
doSnapshot()
// Return the signal back since shutdown will be waiting.
close(qch)
return
case <-aq.ch:
ces := aq.pop()
for _, ce := range ces {
if ce == nil {
// Signals we have replayed all of our metadata.
js.clearMetaRecovering()
// Process any removes that are still valid after recovery.
for _, ca := range ru.removeConsumers {
js.processConsumerRemoval(ca)
}
for _, sa := range ru.removeStreams {
js.processStreamRemoval(sa)
}
// Process pending updates.
for _, sa := range ru.updateStreams {
js.processUpdateStreamAssignment(sa)
}
// Now consumers.
for _, ca := range ru.updateConsumers {
js.processConsumerAssignment(ca)
}
// Clear.
ru = nil
s.Debugf("Recovered JetStream cluster metadata")
js.checkForOrphans()
continue
}
// FIXME(dlc) - Deal with errors.
if didSnap, didStreamRemoval, didConsumerRemoval, err := js.applyMetaEntries(ce.Entries, ru); err == nil {
_, nb := n.Applied(ce.Index)
if js.hasPeerEntries(ce.Entries) || didSnap || didStreamRemoval {
// Since we received one make sure we have our own since we do not store
// our meta state outside of raft.
doSnapshot()
} else if didConsumerRemoval && time.Since(lastSnapTime) > minSnapDelta/2 {
doSnapshot()
} else if lls := len(lastSnap); nb > uint64(lls*8) && lls > 0 && time.Since(lastSnapTime) > minSnapDelta {
doSnapshot()
}
}
}
aq.recycle(&ces)
case isLeader = <-lch:
js.processLeaderChange(isLeader)
if isLeader {
s.sendInternalMsgLocked(serverStatsPingReqSubj, _EMPTY_, nil, nil)
// Install a snapshot as we become leader.
js.checkClusterSize()
doSnapshot()
}
case <-t.C:
doSnapshot()
// Periodically check the cluster size.
if n.Leader() {
js.checkClusterSize()
}
case <-lt.C:
s.Debugf("Checking JetStream cluster state")
// If we have a current leader or had one in the past we can cancel this here since the metaleader
// will be in charge of all peer state changes.
// For cold boot only.
if n.GroupLeader() != _EMPTY_ || n.HadPreviousLeader() {
lt.Stop()
continue
}
// If we are here we do not have a leader and we did not have a previous one, so cold start.
// Check to see if we can adjust our cluster size down iff we are in mixed mode and we have
// seen a total that is what our original estimate was.
cs := n.ClusterSize()
if js, total := s.trackedJetStreamServers(); js < total && total >= cs && js != cs {
s.Noticef("Adjusting JetStream expected peer set size to %d from original %d", js, cs)
n.AdjustBootClusterSize(js)
}
}
}
}
// This is called on first leader transition to double check the peers and cluster set size.
func (js *jetStream) checkClusterSize() {
s, n := js.server(), js.getMetaGroup()
if n == nil {
return
}
// We will check that we have a correct cluster set size by checking for any non-js servers
// which can happen in mixed mode.
ps := n.(*raft).currentPeerState()
if len(ps.knownPeers) >= ps.clusterSize {
return
}
// Grab our active peers.
peers := s.ActivePeers()
// If we have not registered all of our peers yet we can"t do
// any adjustments based on a mixed mode. We will periodically check back.
if len(peers) < ps.clusterSize {
return
}
s.Debugf("Checking JetStream cluster size")
// If we are here our known set as the leader is not the same as the cluster size.
// Check to see if we have a mixed mode setup.
var totalJS int
for _, p := range peers {
if si, ok := s.nodeToInfo.Load(p); ok && si != nil {
if si.(nodeInfo).js {
totalJS++
}
}
}
// If we have less then our cluster size adjust that here. Can not do individual peer removals since
// they will not be in the tracked peers.
if totalJS < ps.clusterSize {
s.Debugf("Adjusting JetStream cluster size from %d to %d", ps.clusterSize, totalJS)
if err := n.AdjustClusterSize(totalJS); err != nil {
s.Warnf("Error adjusting JetStream cluster size: %v", err)
}
}
}
// Represents our stable meta state that we can write out.
type writeableStreamAssignment struct {
Client *ClientInfo `json:"client,omitempty"`
Created time.Time `json:"created"`
Config *StreamConfig `json:"stream"`
Group *raftGroup `json:"group"`
Sync string `json:"sync"`
Consumers []*consumerAssignment
}
func (js *jetStream) clusterStreamConfig(accName, streamName string) (StreamConfig, bool) {
js.mu.RLock()
defer js.mu.RUnlock()
if sa, ok := js.cluster.streams[accName][streamName]; ok {
return *sa.Config, true
}
return StreamConfig{}, false
}
func (js *jetStream) metaSnapshot() []byte {
var streams []writeableStreamAssignment
js.mu.RLock()
cc := js.cluster
for _, asa := range cc.streams {
for _, sa := range asa {
wsa := writeableStreamAssignment{
Client: sa.Client,
Created: sa.Created,
Config: sa.Config,
Group: sa.Group,
Sync: sa.Sync,
}
for _, ca := range sa.consumers {
wsa.Consumers = append(wsa.Consumers, ca)
}
streams = append(streams, wsa)
}
}
if len(streams) == 0 {
js.mu.RUnlock()
return nil
}
b, _ := json.Marshal(streams)
js.mu.RUnlock()
return s2.EncodeBetter(nil, b)
}
func (js *jetStream) applyMetaSnapshot(buf []byte, ru *recoveryUpdates, isRecovering bool) error {
var wsas []writeableStreamAssignment
if len(buf) > 0 {
jse, err := s2.Decode(nil, buf)
if err != nil {
return err
}
if err = json.Unmarshal(jse, &wsas); err != nil {
return err
}
}
// Build our new version here outside of js.
streams := make(map[string]map[string]*streamAssignment)
for _, wsa := range wsas {
fixCfgMirrorWithDedupWindow(wsa.Config)
as := streams[wsa.Client.serviceAccount()]
if as == nil {
as = make(map[string]*streamAssignment)
streams[wsa.Client.serviceAccount()] = as
}
sa := &streamAssignment{Client: wsa.Client, Created: wsa.Created, Config: wsa.Config, Group: wsa.Group, Sync: wsa.Sync}
if len(wsa.Consumers) > 0 {
sa.consumers = make(map[string]*consumerAssignment)
for _, ca := range wsa.Consumers {
sa.consumers[ca.Name] = ca
}
}
as[wsa.Config.Name] = sa
}
js.mu.Lock()
cc := js.cluster
var saAdd, saDel, saChk []*streamAssignment
// Walk through the old list to generate the delete list.
for account, asa := range cc.streams {
nasa := streams[account]
for sn, sa := range asa {
if nsa := nasa[sn]; nsa == nil {
saDel = append(saDel, sa)
} else {
saChk = append(saChk, nsa)
}
}
}
// Walk through the new list to generate the add list.
for account, nasa := range streams {
asa := cc.streams[account]
for sn, sa := range nasa {
if asa[sn] == nil {
saAdd = append(saAdd, sa)
}
}
}
// Now walk the ones to check and process consumers.
var caAdd, caDel []*consumerAssignment
for _, sa := range saChk {
// Make sure to add in all the new ones from sa.
for _, ca := range sa.consumers {
caAdd = append(caAdd, ca)
}
if osa := js.streamAssignment(sa.Client.serviceAccount(), sa.Config.Name); osa != nil {
for _, ca := range osa.consumers {
if sa.consumers[ca.Name] == nil {
caDel = append(caDel, ca)
} else {
caAdd = append(caAdd, ca)
}
}
}
}
js.mu.Unlock()
// Do removals first.
for _, sa := range saDel {
js.setStreamAssignmentRecovering(sa)
if isRecovering {
key := sa.recoveryKey()
ru.removeStreams[key] = sa
delete(ru.updateStreams, key)
} else {
js.processStreamRemoval(sa)
}
}
// Now do add for the streams. Also add in all consumers.
for _, sa := range saAdd {
js.setStreamAssignmentRecovering(sa)
js.processStreamAssignment(sa)
// We can simply process the consumers.
for _, ca := range sa.consumers {
js.setConsumerAssignmentRecovering(ca)
js.processConsumerAssignment(ca)
}
}
// Perform updates on those in saChk. These were existing so make
// sure to process any changes.
for _, sa := range saChk {
js.setStreamAssignmentRecovering(sa)
if isRecovering {
key := sa.recoveryKey()
ru.updateStreams[key] = sa
delete(ru.removeStreams, key)
} else {
js.processUpdateStreamAssignment(sa)
}
}
// Now do the deltas for existing stream"s consumers.
for _, ca := range caDel {
js.setConsumerAssignmentRecovering(ca)
if isRecovering {
key := ca.recoveryKey()
ru.removeConsumers[key] = ca
delete(ru.updateConsumers, key)
} else {
js.processConsumerRemoval(ca)
}
}
for _, ca := range caAdd {
js.setConsumerAssignmentRecovering(ca)
if isRecovering {
key := ca.recoveryKey()
delete(ru.removeConsumers, key)
ru.updateConsumers[key] = ca
} else {
js.processConsumerAssignment(ca)
}
}
return nil
}
// Called on recovery to make sure we do not process like original.
func (js *jetStream) setStreamAssignmentRecovering(sa *streamAssignment) {
js.mu.Lock()
defer js.mu.Unlock()
sa.responded = true
sa.recovering = true
sa.Restore = nil
if sa.Group != nil {
sa.Group.Preferred = _EMPTY_
}
}
// Called on recovery to make sure we do not process like original.
func (js *jetStream) setConsumerAssignmentRecovering(ca *consumerAssignment) {
js.mu.Lock()
defer js.mu.Unlock()
ca.responded = true
ca.recovering = true
if ca.Group != nil {
ca.Group.Preferred = _EMPTY_
}
}
// Just copies over and changes out the group so it can be encoded.
// Lock should be held.
func (sa *streamAssignment) copyGroup() *streamAssignment {
csa, cg := *sa, *sa.Group
csa.Group = &cg
csa.Group.Peers = copyStrings(sa.Group.Peers)
return &csa
}
// Just copies over and changes out the group so it can be encoded.
// Lock should be held.
func (ca *consumerAssignment) copyGroup() *consumerAssignment {
cca, cg := *ca, *ca.Group
cca.Group = &cg
cca.Group.Peers = copyStrings(ca.Group.Peers)
return &cca
}
// Lock should be held.
func (sa *streamAssignment) missingPeers() bool {
return len(sa.Group.Peers) < sa.Config.Replicas
}
// Called when we detect a new peer. Only the leader will process checking
// for any streams, and consequently any consumers.
func (js *jetStream) processAddPeer(peer string) {
js.mu.Lock()
defer js.mu.Unlock()
s, cc := js.srv, js.cluster
isLeader := cc.isLeader()
// Now check if we are meta-leader. We will check for any re-assignments.
if !isLeader {
return
}
sir, ok := s.nodeToInfo.Load(peer)
if !ok || sir == nil {
return
}
si := sir.(nodeInfo)
for _, asa := range cc.streams {
for _, sa := range asa {
if sa.missingPeers() {
// Make sure the right cluster etc.
if si.cluster != sa.Client.Cluster {
continue
}
// If we are here we can add in this peer.
csa := sa.copyGroup()
csa.Group.Peers = append(csa.Group.Peers, peer)
// Send our proposal for this csa. Also use same group definition for all the consumers as well.
cc.meta.Propose(encodeAddStreamAssignment(csa))
for _, ca := range sa.consumers {
// Ephemerals are R=1, so only auto-remap durables, or R>1.
if ca.Config.Durable != _EMPTY_ || len(ca.Group.Peers) > 1 {
cca := ca.copyGroup()
cca.Group.Peers = csa.Group.Peers
cc.meta.Propose(encodeAddConsumerAssignment(cca))
}
}
}
}
}
}
func (js *jetStream) processRemovePeer(peer string) {
js.mu.Lock()
s, cc := js.srv, js.cluster
if cc.meta == nil {
js.mu.Unlock()
return
}
isLeader := cc.isLeader()
// All nodes will check if this is them.
isUs := cc.meta.ID() == peer
disabled := js.disabled
js.mu.Unlock()
// We may be already disabled.
if disabled {
return
}
if isUs {
s.Errorf("JetStream being DISABLED, our server was removed from the cluster")
adv := &JSServerRemovedAdvisory{
TypedEvent: TypedEvent{
Type: JSServerRemovedAdvisoryType,
ID: nuid.Next(),
Time: time.Now().UTC(),
},
Server: s.Name(),
ServerID: s.ID(),
Cluster: s.cachedClusterName(),
Domain: s.getOpts().JetStreamDomain,
}
s.publishAdvisory(nil, JSAdvisoryServerRemoved, adv)
go s.DisableJetStream()
}
// Now check if we are meta-leader. We will attempt re-assignment.
if !isLeader {
return
}
js.mu.Lock()
defer js.mu.Unlock()
for _, asa := range cc.streams {
for _, sa := range asa {
if rg := sa.Group; rg.isMember(peer) {
js.removePeerFromStreamLocked(sa, peer)
}
}
}
}
// Assumes all checks have already been done.
func (js *jetStream) removePeerFromStream(sa *streamAssignment, peer string) bool {
js.mu.Lock()
defer js.mu.Unlock()
return js.removePeerFromStreamLocked(sa, peer)
}
// Lock should be held.
func (js *jetStream) removePeerFromStreamLocked(sa *streamAssignment, peer string) bool {
if rg := sa.Group; !rg.isMember(peer) {
return false
}
s, cc, csa := js.srv, js.cluster, sa.copyGroup()
replaced := cc.remapStreamAssignment(csa, peer)
if !replaced {
s.Warnf("JetStream cluster could not replace peer for stream "%s > %s"", sa.Client.serviceAccount(), sa.Config.Name)
}
// Send our proposal for this csa. Also use same group definition for all the consumers as well.
cc.meta.Propose(encodeAddStreamAssignment(csa))
rg := csa.Group
for _, ca := range sa.consumers {
// Ephemerals are R=1, so only auto-remap durables, or R>1.
if ca.Config.Durable != _EMPTY_ {
cca := ca.copyGroup()
cca.Group.Peers, cca.Group.Preferred = rg.Peers, _EMPTY_
cc.meta.Propose(encodeAddConsumerAssignment(cca))
} else if ca.Group.isMember(peer) {
// These are ephemerals. Check to see if we deleted this peer.
cc.meta.Propose(encodeDeleteConsumerAssignment(ca))
}
}
return replaced
}
// Check if we have peer related entries.
func (js *jetStream) hasPeerEntries(entries []*Entry) bool {
for _, e := range entries {
if e.Type == EntryRemovePeer || e.Type == EntryAddPeer {
return true
}
}
return false
}
const ksep = ":"
func (sa *streamAssignment) recoveryKey() string {
if sa == nil {
return _EMPTY_
}
return sa.Client.serviceAccount() + ksep + sa.Config.Name
}
func (ca *consumerAssignment) recoveryKey() string {
if ca == nil {
return _EMPTY_
}
return ca.Client.serviceAccount() + ksep + ca.Stream + ksep + ca.Name
}
func (js *jetStream) applyMetaEntries(entries []*Entry, ru *recoveryUpdates) (bool, bool, bool, error) {
var didSnap, didRemoveStream, didRemoveConsumer bool
isRecovering := js.isMetaRecovering()
for _, e := range entries {
if e.Type == EntrySnapshot {
js.applyMetaSnapshot(e.Data, ru, isRecovering)
didSnap = true
} else if e.Type == EntryRemovePeer {
if !isRecovering {
js.processRemovePeer(string(e.Data))
}
} else if e.Type == EntryAddPeer {
if !isRecovering {
js.processAddPeer(string(e.Data))
}
} else {
buf := e.Data
switch entryOp(buf[0]) {
case assignStreamOp:
sa, err := decodeStreamAssignment(buf[1:])
if err != nil {
js.srv.Errorf("JetStream cluster failed to decode stream assignment: %q", buf[1:])
return didSnap, didRemoveStream, didRemoveConsumer, err
}
if isRecovering {
js.setStreamAssignmentRecovering(sa)
delete(ru.removeStreams, sa.recoveryKey())
}
if js.processStreamAssignment(sa) {
didRemoveStream = true
}
case removeStreamOp:
sa, err := decodeStreamAssignment(buf[1:])
if err != nil {
js.srv.Errorf("JetStream cluster failed to decode stream assignment: %q", buf[1:])
return didSnap, didRemoveStream, didRemoveConsumer, err
}
if isRecovering {
js.setStreamAssignmentRecovering(sa)
key := sa.recoveryKey()
ru.removeStreams[key] = sa
delete(ru.updateStreams, key)
} else {
js.processStreamRemoval(sa)
didRemoveStream = true
}
case assignConsumerOp:
ca, err := decodeConsumerAssignment(buf[1:])
if err != nil {
js.srv.Errorf("JetStream cluster failed to decode consumer assignment: %q", buf[1:])
return didSnap, didRemoveStream, didRemoveConsumer, err
}
if isRecovering {
js.setConsumerAssignmentRecovering(ca)
key := ca.recoveryKey()
delete(ru.removeConsumers, key)
ru.updateConsumers[key] = ca
} else {
js.processConsumerAssignment(ca)
}
case assignCompressedConsumerOp:
ca, err := decodeConsumerAssignmentCompressed(buf[1:])
if err != nil {
js.srv.Errorf("JetStream cluster failed to decode compressed consumer assignment: %q", buf[1:])
return didSnap, didRemoveStream, didRemoveConsumer, err
}
if isRecovering {
js.setConsumerAssignmentRecovering(ca)
key := ca.recoveryKey()
delete(ru.removeConsumers, key)
ru.updateConsumers[key] = ca
} else {
js.processConsumerAssignment(ca)
}
case removeConsumerOp:
ca, err := decodeConsumerAssignment(buf[1:])
if err != nil {
js.srv.Errorf("JetStream cluster failed to decode consumer assignment: %q", buf[1:])
return didSnap, didRemoveStream, didRemoveConsumer, err
}
if isRecovering {
js.setConsumerAssignmentRecovering(ca)
key := ca.recoveryKey()
ru.removeConsumers[key] = ca
delete(ru.updateConsumers, key)
} else {
js.processConsumerRemoval(ca)
didRemoveConsumer = true
}
case updateStreamOp:
sa, err := decodeStreamAssignment(buf[1:])
if err != nil {
js.srv.Errorf("JetStream cluster failed to decode stream assignment: %q", buf[1:])
return didSnap, didRemoveStream, didRemoveConsumer, err
}
if isRecovering {
js.setStreamAssignmentRecovering(sa)
key := sa.recoveryKey()
ru.updateStreams[key] = sa
delete(ru.removeStreams, key)
} else {
js.processUpdateStreamAssignment(sa)
}
default:
panic("JetStream Cluster Unknown meta entry op type")
}
}
}
return didSnap, didRemoveStream, didRemoveConsumer, nil
}
func (rg *raftGroup) isMember(id string) bool {
if rg == nil {
return false
}
for _, peer := range rg.Peers {
if peer == id {
return true
}
}
return false
}
func (rg *raftGroup) setPreferred() {
if rg == nil || len(rg.Peers) == 0 {
return
}
if len(rg.Peers) == 1 {
rg.Preferred = rg.Peers[0]
} else {
// For now just randomly select a peer for the preferred.
pi := rand.Int31n(int32(len(rg.Peers)))
rg.Preferred = rg.Peers[pi]
}
}
// createRaftGroup is called to spin up this raft group if needed.
func (js *jetStream) createRaftGroup(accName string, rg *raftGroup, storage StorageType) error {
js.mu.Lock()
s, cc := js.srv, js.cluster
if cc == nil || cc.meta == nil {
js.mu.Unlock()
return NewJSClusterNotActiveError()
}
// If this is a single peer raft group or we are not a member return.
if len(rg.Peers) <= 1 || !rg.isMember(cc.meta.ID()) {
js.mu.Unlock()
// Nothing to do here.
return nil
}
// Check if we already have this assigned.
if node := s.lookupRaftNode(rg.Name); node != nil {
s.Debugf("JetStream cluster already has raft group %q assigned", rg.Name)
rg.node = node
js.mu.Unlock()
return nil
}
js.mu.Unlock()
s.Debugf("JetStream cluster creating raft group:%+v", rg)
sysAcc := s.SystemAccount()
if sysAcc == nil {
s.Debugf("JetStream cluster detected shutdown processing raft group: %+v", rg)
return errors.New("shutting down")
}
// Check here to see if we have a max HA Assets limit set.
if maxHaAssets := s.getOpts().JetStreamLimits.MaxHAAssets; maxHaAssets > 0 {
if s.numRaftNodes() > maxHaAssets {
s.Warnf("Maximum HA Assets limit reached: %d", maxHaAssets)
// Since the meta leader assigned this, send a statsz update to them to get them up to date.
go s.sendStatszUpdate()
return errors.New("system limit reached")
}
}
storeDir := filepath.Join(js.config.StoreDir, sysAcc.Name, defaultStoreDirName, rg.Name)
var store StreamStore
if storage == FileStorage {
fs, err := newFileStoreWithCreated(
FileStoreConfig{StoreDir: storeDir, BlockSize: defaultMediumBlockSize, AsyncFlush: false, SyncInterval: 5 * time.Minute},
StreamConfig{Name: rg.Name, Storage: FileStorage},
time.Now().UTC(),
s.jsKeyGen(rg.Name),
)
if err != nil {
s.Errorf("Error creating filestore WAL: %v", err)
return err
}
store = fs
} else {
ms, err := newMemStore(&StreamConfig{Name: rg.Name, Storage: MemoryStorage})
if err != nil {
s.Errorf("Error creating memstore WAL: %v", err)
return err
}
store = ms
}
cfg := &RaftConfig{Name: rg.Name, Store: storeDir, Log: store, Track: true}
if _, err := readPeerState(storeDir); err != nil {
s.bootstrapRaftNode(cfg, rg.Peers, true)
}
n, err := s.startRaftNode(accName, cfg)
if err != nil || n == nil {
s.Debugf("Error creating raft group: %v", err)
return err
}
// Need locking here for the assignment to avoid data-race reports
js.mu.Lock()
rg.node = n
// See if we are preferred and should start campaign immediately.
if n.ID() == rg.Preferred && n.Term() == 0 {
n.Campaign()
}
js.mu.Unlock()
return nil
}
func (mset *stream) raftGroup() *raftGroup {
if mset == nil {
return nil
}
mset.mu.RLock()
defer mset.mu.RUnlock()
if mset.sa == nil {
return nil
}
return mset.sa.Group
}
func (mset *stream) raftNode() RaftNode {
if mset == nil {
return nil
}
mset.mu.RLock()
defer mset.mu.RUnlock()
return mset.node
}
func (mset *stream) removeNode() {
mset.mu.Lock()
defer mset.mu.Unlock()
if n := mset.node; n != nil {
n.Delete()
mset.node = nil
}
}
// Helper function to generate peer info.
// lists and sets for old and new.
func genPeerInfo(peers []string, split int) (newPeers, oldPeers []string, newPeerSet, oldPeerSet map[string]bool) {
newPeers = peers[split:]
oldPeers = peers[:split]
newPeerSet = make(map[string]bool, len(newPeers))
oldPeerSet = make(map[string]bool, len(oldPeers))
for i, peer := range peers {
if i < split {
oldPeerSet[peer] = true
} else {
newPeerSet[peer] = true
}
}
return
}
// Monitor our stream node for this stream.
func (js *jetStream) monitorStream(mset *stream, sa *streamAssignment, sendSnapshot bool) {
s, cc := js.server(), js.cluster
defer s.grWG.Done()
if mset != nil {
defer mset.monitorWg.Done()
}
js.mu.RLock()
n := sa.Group.node
meta := cc.meta
js.mu.RUnlock()
if n == nil || meta == nil {
s.Warnf("No RAFT group for "%s > %s"", sa.Client.serviceAccount(), sa.Config.Name)
return
}
qch, lch, aq, uch, ourPeerId := n.QuitC(), n.LeadChangeC(), n.ApplyQ(), mset.updateC(), meta.ID()
s.Debugf("Starting stream monitor for "%s > %s" [%s]", sa.Client.serviceAccount(), sa.Config.Name, n.Group())
defer s.Debugf("Exiting stream monitor for "%s > %s" [%s]", sa.Client.serviceAccount(), sa.Config.Name, n.Group())
// Make sure to stop the raft group on exit to prevent accidental memory bloat.
defer n.Stop()
// Make sure we do not leave the apply channel to fill up and block the raft layer.
defer func() {
if n.State() == Closed {
return
}
if n.Leader() {
n.StepDown()
}
// Drain the commit queue...
aq.drain()
}()
const (
compactInterval = 2 * time.Minute
compactSizeMin = 8 * 1024 * 1024
compactNumMin = 65536
minSnapDelta = 10 * time.Second
)
// Spread these out for large numbers on server restart.
rci := time.Duration(rand.Int63n(int64(time.Minute)))
t := time.NewTicker(compactInterval + rci)
defer t.Stop()
js.mu.RLock()
isLeader := cc.isStreamLeader(sa.Client.serviceAccount(), sa.Config.Name)
isRestore := sa.Restore != nil
js.mu.RUnlock()
acc, err := s.LookupAccount(sa.Client.serviceAccount())
if err != nil {
s.Warnf("Could not retrieve account for stream "%s > %s"", sa.Client.serviceAccount(), sa.Config.Name)
return
}
accName := acc.GetName()
// Hash of the last snapshot (fixed size in memory).
var lastSnap []byte
var lastSnapTime time.Time
// Highwayhash key for generating hashes.
key := make([]byte, 32)
rand.Read(key)
// Should only to be called from leader.
doSnapshot := func() {
if mset == nil || isRestore || time.Since(lastSnapTime) < minSnapDelta {
return
}
snap := mset.stateSnapshot()
ne, nb := n.Size()
hash := highwayhash.Sum(snap, key)
// If the state hasn"t changed but the log has gone way over
// the compaction size then we will want to compact anyway.
// This shouldn"t happen for streams like it can for pull
// consumers on idle streams but better to be safe than sorry!
if !bytes.Equal(hash[:], lastSnap) || ne >= compactNumMin || nb >= compactSizeMin {
if err := n.InstallSnapshot(snap); err == nil {
lastSnap, lastSnapTime = hash[:], time.Now()
} else if err != errNoSnapAvailable && err != errNodeClosed {
s.Warnf("Failed to install snapshot for "%s > %s" [%s]: %v", mset.acc.Name, mset.name(), n.Group(), err)
}
}
}
// We will establish a restoreDoneCh no matter what. Will never be triggered unless
// we replace with the restore chan.
restoreDoneCh := make(<-chan error)
isRecovering := true
// For migration tracking.
var mmt *time.Ticker
var mmtc <-chan time.Time
startMigrationMonitoring := func() {
if mmt == nil {
mmt = time.NewTicker(500 * time.Millisecond)
mmtc = mmt.C
}
}
stopMigrationMonitoring := func() {
if mmt != nil {
mmt.Stop()
mmt, mmtc = nil, nil
}
}
defer stopMigrationMonitoring()
// This is to optionally track when we are ready as a non-leader for direct access participation.
// Either direct or if we are a direct mirror, or both.
var dat *time.Ticker
var datc <-chan time.Time
startDirectAccessMonitoring := func() {
if dat == nil {
dat = time.NewTicker(1 * time.Second)
datc = dat.C
}
}
stopDirectMonitoring := func() {
if dat != nil {
dat.Stop()
dat, datc = nil, nil
}
}
defer stopDirectMonitoring()
// This is triggered during a scale up from R1 to clustered mode. We need the new followers to catchup,
// similar to how we trigger the catchup mechanism post a backup/restore.
// We can arrive here NOT being the leader, so we send the snapshot only if we are, and in this case
// reset the notion that we need to send the snapshot. If we are not, then the first time the server
// will switch to leader (in the loop below), we will send the snapshot.
if sendSnapshot && isLeader && mset != nil && n != nil {
n.SendSnapshot(mset.stateSnapshot())
sendSnapshot = false
}
for {
select {
case <-s.quitCh:
return
case <-qch:
return
case <-aq.ch:
var ne, nb uint64
ces := aq.pop()
for _, ce := range ces {
// No special processing needed for when we are caught up on restart.
if ce == nil {
isRecovering = false
// Check on startup if we should snapshot/compact.
if _, b := n.Size(); b > compactSizeMin || n.NeedSnapshot() {
doSnapshot()
}
continue
}
// Apply our entries.
if err := js.applyStreamEntries(mset, ce, isRecovering); err == nil {
// Update our applied.
ne, nb = n.Applied(ce.Index)
} else {
s.Warnf("Error applying entries to "%s > %s": %v", accName, sa.Config.Name, err)
if isClusterResetErr(err) {
if mset.isMirror() && mset.IsLeader() {
mset.retryMirrorConsumer()
continue
}
// We will attempt to reset our cluster state.
if mset.resetClusteredState(err) {
aq.recycle(&ces)
return
}
} else if isOutOfSpaceErr(err) {
// If applicable this will tear all of this down, but don"t assume so and return.
s.handleOutOfSpace(mset)
}
}
}
aq.recycle(&ces)
// Check about snapshotting
// If we have at least min entries to compact, go ahead and try to snapshot/compact.
if ne >= compactNumMin || nb > compactSizeMin {
doSnapshot()
}
case isLeader = <-lch:
if isLeader {
if sendSnapshot && mset != nil && n != nil {
n.SendSnapshot(mset.stateSnapshot())
sendSnapshot = false
}
if isRestore {
acc, _ := s.LookupAccount(sa.Client.serviceAccount())
restoreDoneCh = s.processStreamRestore(sa.Client, acc, sa.Config, _EMPTY_, sa.Reply, _EMPTY_)
continue
} else if n.NeedSnapshot() {
doSnapshot()
}
// Always cancel if this was running.
stopDirectMonitoring()
} else if n.GroupLeader() != noLeader {
js.setStreamAssignmentRecovering(sa)
}
// Process our leader change.
js.processStreamLeaderChange(mset, isLeader)
// We may receive a leader change after the stream assignment which would cancel us
// monitoring for this closely. So re-assess our state here as well.
// Or the old leader is no longer part of the set and transferred leadership
// for this leader to resume with removal
migrating := mset.isMigrating()
// Check for migrations here. We set the state on the stream assignment update below.
if isLeader && migrating {
startMigrationMonitoring()
}
// Here we are checking if we are not the leader but we have been asked to allow
// direct access. We now allow non-leaders to participate in the queue group.
if !isLeader && mset != nil {
mset.mu.Lock()
// Check direct gets first.
if mset.cfg.AllowDirect {
if mset.directSub == nil && mset.isCurrent() {
mset.subscribeToDirect()
} else {
startDirectAccessMonitoring()
}
}
// Now check for mirror directs as well.
if mset.cfg.MirrorDirect {
if mset.mirror != nil && mset.mirror.dsub == nil && mset.isCurrent() {
mset.subscribeToMirrorDirect()
} else {
startDirectAccessMonitoring()
}
}
mset.mu.Unlock()
}
case <-datc:
mset.mu.Lock()
ad, md, current := mset.cfg.AllowDirect, mset.cfg.MirrorDirect, mset.isCurrent()
if !current {
const syncThreshold = 90.0
// We are not current, but current means exactly caught up. Under heavy publish
// loads we may never reach this, so check if we are within 90% caught up.
_, c, a := mset.node.Progress()
if p := float64(a) / float64(c) * 100.0; p < syncThreshold {
mset.mu.Unlock()
continue
} else {
s.Debugf("Stream "%s > %s" enabling direct gets at %.0f%% synchronized",
sa.Client.serviceAccount(), sa.Config.Name, p)
}
}
// We are current, cancel monitoring and create the direct subs as needed.
if ad {
mset.subscribeToDirect()
}
if md {
mset.subscribeToMirrorDirect()
}
mset.mu.Unlock()
// Stop monitoring.
stopDirectMonitoring()
case <-t.C:
doSnapshot()
// Check is we have preAcks left over if we have become the leader.
if isLeader {
mset.mu.Lock()
if mset.preAcks != nil {
mset.preAcks = nil
}
mset.mu.Unlock()
}
case <-uch:
// keep stream assignment current
sa = mset.streamAssignment()
// keep peer list up to date with config
js.checkPeers(mset.raftGroup())
// We get this when we have a new stream assignment caused by an update.
// We want to know if we are migrating.
if migrating := mset.isMigrating(); migrating {
if isLeader && mmtc == nil {
startMigrationMonitoring()
}
} else {
stopMigrationMonitoring()
}
case <-mmtc:
if !isLeader {
// We are no longer leader, so not our job.
stopMigrationMonitoring()
continue
}
// Check to see where we are..
rg := mset.raftGroup()
ci := js.clusterInfo(rg)
mset.checkClusterInfo(ci)
// Track the new peers and check the ones that are current.
mset.mu.RLock()
replicas := mset.cfg.Replicas
mset.mu.RUnlock()
if len(rg.Peers) <= replicas {
// Migration no longer happening, so not our job anymore
stopMigrationMonitoring()
continue
}
newPeers, oldPeers, newPeerSet, oldPeerSet := genPeerInfo(rg.Peers, len(rg.Peers)-replicas)
// If we are part of the new peerset and we have been passed the baton.
// We will handle scale down.
if newPeerSet[ourPeerId] {
// First need to check on any consumers and make sure they have moved properly before scaling down ourselves.
js.mu.RLock()
var needToWait bool
for name, c := range sa.consumers {
for _, peer := range c.Group.Peers {
// If we have peers still in the old set block.
if oldPeerSet[peer] {
s.Debugf("Scale down of "%s > %s" blocked by consumer "%s"", accName, sa.Config.Name, name)
needToWait = true
break
}
}
if needToWait {
break
}
}
js.mu.RUnlock()
if needToWait {
continue
}
// We are good to go, can scale down here.
for _, p := range oldPeers {
n.ProposeRemovePeer(p)
}
csa := sa.copyGroup()
csa.Group.Peers = newPeers
csa.Group.Preferred = ourPeerId
csa.Group.Cluster = s.cachedClusterName()
cc.meta.ForwardProposal(encodeUpdateStreamAssignment(csa))
s.Noticef("Scaling down "%s > %s" to %+v", accName, sa.Config.Name, s.peerSetToNames(newPeers))
} else {
// We are the old leader here, from the original peer set.
// We are simply waiting on the new peerset to be caught up so we can transfer leadership.
var newLeaderPeer, newLeader string
neededCurrent, current := replicas/2+1, 0
for _, r := range ci.Replicas {
if r.Current && newPeerSet[r.Peer] {
current++
if newLeader == _EMPTY_ {
newLeaderPeer, newLeader = r.Peer, r.Name
}
}
}
// Check if we have a quorom.
if current >= neededCurrent {
s.Noticef("Transfer of stream leader for "%s > %s" to "%s"", accName, sa.Config.Name, newLeader)
n.StepDown(newLeaderPeer)
}
}
case err := <-restoreDoneCh:
// We have completed a restore from snapshot on this server. The stream assignment has
// already been assigned but the replicas will need to catch up out of band. Consumers
// will need to be assigned by forwarding the proposal and stamping the initial state.
s.Debugf("Stream restore for "%s > %s" completed", sa.Client.serviceAccount(), sa.Config.Name)
if err != nil {
s.Debugf("Stream restore failed: %v", err)
}
isRestore = false
sa.Restore = nil
// If we were successful lookup up our stream now.
if err == nil {
if mset, err = acc.lookupStream(sa.Config.Name); mset != nil {
mset.monitorWg.Add(1)
defer mset.monitorWg.Done()
mset.setStreamAssignment(sa)
// Make sure to update our updateC which would have been nil.
uch = mset.updateC()
}
}
if err != nil {
if mset != nil {
mset.delete()
}
js.mu.Lock()
sa.err = err
if n != nil {
n.Delete()
}
result := &streamAssignmentResult{
Account: sa.Client.serviceAccount(),
Stream: sa.Config.Name,
Restore: &JSApiStreamRestoreResponse{ApiResponse: ApiResponse{Type: JSApiStreamRestoreResponseType}},
}
result.Restore.Error = NewJSStreamAssignmentError(err, Unless(err))
js.mu.Unlock()
// Send response to the metadata leader. They will forward to the user as needed.
s.sendInternalMsgLocked(streamAssignmentSubj, _EMPTY_, nil, result)
return
}
if !isLeader {
panic("Finished restore but not leader")
}
// Trigger the stream followers to catchup.
if n = mset.raftNode(); n != nil {
n.SendSnapshot(mset.stateSnapshot())
}
js.processStreamLeaderChange(mset, isLeader)
// Check to see if we have restored consumers here.
// These are not currently assigned so we will need to do so here.
if consumers := mset.getPublicConsumers(); len(consumers) > 0 {
for _, o := range consumers {
name, cfg := o.String(), o.config()
rg := cc.createGroupForConsumer(&cfg, sa)
// Pick a preferred leader.
rg.setPreferred()
// Place our initial state here as well for assignment distribution.
state, _ := o.store.State()
ca := &consumerAssignment{
Group: rg,
Stream: sa.Config.Name,
Name: name,
Config: &cfg,
Client: sa.Client,
Created: o.createdTime(),
State: state,
}
// We make these compressed in case state is complex.
addEntry := encodeAddConsumerAssignmentCompressed(ca)
cc.meta.ForwardProposal(addEntry)
// Check to make sure we see the assignment.
go func() {
ticker := time.NewTicker(time.Second)
defer ticker.Stop()
for range ticker.C {
js.mu.RLock()
ca, meta := js.consumerAssignment(ca.Client.serviceAccount(), sa.Config.Name, name), cc.meta
js.mu.RUnlock()
if ca == nil {
s.Warnf("Consumer assignment has not been assigned, retrying")
if meta != nil {
meta.ForwardProposal(addEntry)
} else {
return
}
} else {
return
}
}
}()
}
}
}
}
}
// Determine if we are migrating
func (mset *stream) isMigrating() bool {
if mset == nil {
return false
}
mset.mu.RLock()
js, sa := mset.js, mset.sa
mset.mu.RUnlock()
js.mu.RLock()
defer js.mu.RUnlock()
// During migration we will always be R>1, even when we start R1.
// So if we do not have a group or node we no we are not migrating.
if sa == nil || sa.Group == nil || sa.Group.node == nil {
return false
}
// The sign of migration is if our group peer count != configured replica count.
if sa.Config.Replicas == len(sa.Group.Peers) {
return false
}
return true
}
// resetClusteredState is called when a clustered stream had a sequence mismatch and needs to be reset.
func (mset *stream) resetClusteredState(err error) bool {
mset.mu.RLock()
s, js, jsa, sa, acc, node := mset.srv, mset.js, mset.jsa, mset.sa, mset.acc, mset.node
stype, isLeader, tierName := mset.cfg.Storage, mset.isLeader(), mset.tier
mset.mu.RUnlock()
// Stepdown regardless if we are the leader here.
if isLeader && node != nil {
node.StepDown()
}
// Server
if js.limitsExceeded(stype) {
s.Debugf("Will not reset stream, server resources exceeded")
return false
}
// Account
if exceeded, _ := jsa.limitsExceeded(stype, tierName); exceeded {
s.Warnf("stream "%s > %s" errored, account resources exceeded", acc, mset.name())
return false
}
// We delete our raft state. Will recreate.
if node != nil {
node.Delete()
}
// Preserve our current state and messages unless we have a first sequence mismatch.
shouldDelete := err == errFirstSequenceMismatch
mset.stop(shouldDelete, false)
if sa != nil {
s.Warnf("Resetting stream cluster state for "%s > %s"", sa.Client.serviceAccount(), sa.Config.Name)
js.mu.Lock()
sa.Group.node = nil
js.mu.Unlock()
go js.restartClustered(acc, sa)
}
return true
}
// This will reset the stream and consumers.
// Should be done in separate go routine.
func (js *jetStream) restartClustered(acc *Account, sa *streamAssignment) {
// Check and collect consumers first.
js.mu.RLock()
var consumers []*consumerAssignment
if cc := js.cluster; cc != nil && cc.meta != nil {
ourID := cc.meta.ID()
for _, ca := range sa.consumers {
if rg := ca.Group; rg != nil && rg.isMember(ourID) {
rg.node = nil // Erase group raft/node state.
consumers = append(consumers, ca)
}
}
}
js.mu.RUnlock()
// Reset stream.
js.processClusterCreateStream(acc, sa)
// Reset consumers.
for _, ca := range consumers {
js.processClusterCreateConsumer(ca, nil, false)
}
}
func isControlHdr(hdr []byte) bool {
return bytes.HasPrefix(hdr, []byte("NATS/1.0 100 "))
}
// Apply our stream entries.
func (js *jetStream) applyStreamEntries(mset *stream, ce *CommittedEntry, isRecovering bool) error {
for _, e := range ce.Entries {
if e.Type == EntryNormal {
buf, op := e.Data, entryOp(e.Data[0])
switch op {
case streamMsgOp, compressedStreamMsgOp:
if mset == nil {
continue
}
s := js.srv
mbuf := buf[1:]
if op == compressedStreamMsgOp {
var err error
mbuf, err = s2.Decode(nil, mbuf)
if err != nil {
panic(err.Error())
}
}
subject, reply, hdr, msg, lseq, ts, err := decodeStreamMsg(mbuf)
if err != nil {
if node := mset.raftNode(); node != nil {
s.Errorf("JetStream cluster could not decode stream msg for "%s > %s" [%s]",
mset.account(), mset.name(), node.Group())
}
panic(err.Error())
}
// Check for flowcontrol here.
if len(msg) == 0 && len(hdr) > 0 && reply != _EMPTY_ && isControlHdr(hdr) {
if !isRecovering {
mset.sendFlowControlReply(reply)
}
continue
}
// Grab last sequence and CLFS.
last, clfs := mset.lastSeqAndCLFS()
// We can skip if we know this is less than what we already have.
if lseq-clfs < last {
s.Debugf("Apply stream entries for "%s > %s" skipping message with sequence %d with last of %d",
mset.account(), mset.name(), lseq+1-clfs, last)
continue
}
// Skip by hand here since first msg special case.
// Reason is sequence is unsigned and for lseq being 0
// the lseq under stream would have to be -1.
if lseq == 0 && last != 0 {
continue
}
// Messages to be skipped have no subject or timestamp or msg or hdr.
if subject == _EMPTY_ && ts == 0 && len(msg) == 0 && len(hdr) == 0 {
// Skip and update our lseq.
mset.setLastSeq(mset.store.SkipMsg())
continue
}
// Process the actual message here.
if err := mset.processJetStreamMsg(subject, reply, hdr, msg, lseq, ts); err != nil {
// Only return in place if we are going to reset stream or we are out of space.
if isClusterResetErr(err) || isOutOfSpaceErr(err) {
return err
}
s.Debugf("Apply stream entries for "%s > %s" got error processing message: %v",
mset.account(), mset.name(), err)
}
case deleteMsgOp:
md, err := decodeMsgDelete(buf[1:])
if err != nil {
if node := mset.raftNode(); node != nil {
s := js.srv
s.Errorf("JetStream cluster could not decode delete msg for "%s > %s" [%s]",
mset.account(), mset.name(), node.Group())
}
panic(err.Error())
}
s, cc := js.server(), js.cluster
var removed bool
if md.NoErase {
removed, err = mset.removeMsg(md.Seq)
} else {
removed, err = mset.eraseMsg(md.Seq)
}
// Cluster reset error.
if err == ErrStoreEOF {
return err
}
if err != nil && !isRecovering {
s.Debugf("JetStream cluster failed to delete stream msg %d from "%s > %s": %v",
md.Seq, md.Client.serviceAccount(), md.Stream, err)
}
js.mu.RLock()
isLeader := cc.isStreamLeader(md.Client.serviceAccount(), md.Stream)
js.mu.RUnlock()
if isLeader && !isRecovering {
var resp = JSApiMsgDeleteResponse{ApiResponse: ApiResponse{Type: JSApiMsgDeleteResponseType}}
if err != nil {
resp.Error = NewJSStreamMsgDeleteFailedError(err, Unless(err))
s.sendAPIErrResponse(md.Client, mset.account(), md.Subject, md.Reply, _EMPTY_, s.jsonResponse(resp))
} else if !removed {
resp.Error = NewJSSequenceNotFoundError(md.Seq)
s.sendAPIErrResponse(md.Client, mset.account(), md.Subject, md.Reply, _EMPTY_, s.jsonResponse(resp))
} else {
resp.Success = true
s.sendAPIResponse(md.Client, mset.account(), md.Subject, md.Reply, _EMPTY_, s.jsonResponse(resp))
}
}
case purgeStreamOp:
sp, err := decodeStreamPurge(buf[1:])
if err != nil {
if node := mset.raftNode(); node != nil {
s := js.srv
s.Errorf("JetStream cluster could not decode purge msg for "%s > %s" [%s]",
mset.account(), mset.name(), node.Group())
}
panic(err.Error())
}
// Ignore if we are recovering and we have already processed.
if isRecovering {
if mset.state().FirstSeq <= sp.LastSeq {
// Make sure all messages from the purge are gone.
mset.store.Compact(sp.LastSeq + 1)
}
continue
}
s := js.server()
purged, err := mset.purge(sp.Request)
if err != nil {
s.Warnf("JetStream cluster failed to purge stream %q for account %q: %v", sp.Stream, sp.Client.serviceAccount(), err)
}
js.mu.RLock()
isLeader := js.cluster.isStreamLeader(sp.Client.serviceAccount(), sp.Stream)
js.mu.RUnlock()
if isLeader && !isRecovering {
var resp = JSApiStreamPurgeResponse{ApiResponse: ApiResponse{Type: JSApiStreamPurgeResponseType}}
if err != nil {
resp.Error = NewJSStreamGeneralError(err, Unless(err))
s.sendAPIErrResponse(sp.Client, mset.account(), sp.Subject, sp.Reply, _EMPTY_, s.jsonResponse(resp))
} else {
resp.Purged = purged
resp.Success = true
s.sendAPIResponse(sp.Client, mset.account(), sp.Subject, sp.Reply, _EMPTY_, s.jsonResponse(resp))
}
}
default:
panic("JetStream Cluster Unknown group entry op type!")
}
} else if e.Type == EntrySnapshot {
if !isRecovering && mset != nil {
var snap streamSnapshot
if err := json.Unmarshal(e.Data, &snap); err != nil {
return err
}
if !mset.IsLeader() {
if err := mset.processSnapshot(&snap); err != nil {
return err
}
}
} else if isRecovering && mset != nil {
// On recovery, reset CLFS/FAILED.
var snap streamSnapshot
if err := json.Unmarshal(e.Data, &snap); err != nil {
return err
}
mset.mu.Lock()
mset.clfs = snap.Failed
mset.mu.Unlock()
}
} else if e.Type == EntryRemovePeer {
js.mu.RLock()
var ourID string
if js.cluster != nil && js.cluster.meta != nil {
ourID = js.cluster.meta.ID()
}
js.mu.RUnlock()
// We only need to do processing if this is us.
if peer := string(e.Data); peer == ourID && mset != nil {
// Double check here with the registered stream assignment.
shouldRemove := true
if sa := mset.streamAssignment(); sa != nil && sa.Group != nil {
js.mu.RLock()
shouldRemove = !sa.Group.isMember(ourID)
js.mu.RUnlock()
}
if shouldRemove {
mset.stop(true, false)
}
}
return nil
}
}
return nil
}
// Returns the PeerInfo for all replicas of a raft node. This is different than node.Peers()
// and is used for external facing advisories.
func (s *Server) replicas(node RaftNode) []*PeerInfo {
now := time.Now()
var replicas []*PeerInfo
for _, rp := range node.Peers() {
if sir, ok := s.nodeToInfo.Load(rp.ID); ok && sir != nil {
si := sir.(nodeInfo)
pi := &PeerInfo{Peer: rp.ID, Name: si.name, Current: rp.Current, Active: now.Sub(rp.Last), Offline: si.offline, Lag: rp.Lag}
replicas = append(replicas, pi)
}
}
return replicas
}
// Will check our node peers and see if we should remove a peer.
func (js *jetStream) checkPeers(rg *raftGroup) {
js.mu.Lock()
defer js.mu.Unlock()
// FIXME(dlc) - Single replicas?
if rg == nil || rg.node == nil {
return
}
for _, peer := range rg.node.Peers() {
if !rg.isMember(peer.ID) {
rg.node.ProposeRemovePeer(peer.ID)
}
}
}
// Process a leader change for the clustered stream.
func (js *jetStream) processStreamLeaderChange(mset *stream, isLeader bool) {
if mset == nil {
return
}
sa := mset.streamAssignment()
if sa == nil {
return
}
js.mu.Lock()
s, account, err := js.srv, sa.Client.serviceAccount(), sa.err
client, subject, reply := sa.Client, sa.Subject, sa.Reply
hasResponded := sa.responded
sa.responded = true
peers := copyStrings(sa.Group.Peers)
js.mu.Unlock()
streamName := mset.name()
if isLeader {
s.Noticef("JetStream cluster new stream leader for "%s > %s"", account, streamName)
s.sendStreamLeaderElectAdvisory(mset)
// Check for peer removal and process here if needed.
js.checkPeers(sa.Group)
mset.checkAllowMsgCompress(peers)
} else {
// We are stepping down.
// Make sure if we are doing so because we have lost quorum that we send the appropriate advisories.
if node := mset.raftNode(); node != nil && !node.Quorum() && time.Since(node.Created()) > 5*time.Second {
s.sendStreamLostQuorumAdvisory(mset)
}
}
// Tell stream to switch leader status.
mset.setLeader(isLeader)
if !isLeader || hasResponded {
return
}
acc, _ := s.LookupAccount(account)
if acc == nil {
return
}
// Send our response.
var resp = JSApiStreamCreateResponse{ApiResponse: ApiResponse{Type: JSApiStreamCreateResponseType}}
if err != nil {
resp.Error = NewJSStreamCreateError(err, Unless(err))
s.sendAPIErrResponse(client, acc, subject, reply, _EMPTY_, s.jsonResponse(&resp))
} else {
resp.StreamInfo = &StreamInfo{
Created: mset.createdTime(),
State: mset.state(),
Config: mset.config(),
Cluster: js.clusterInfo(mset.raftGroup()),
Sources: mset.sourcesInfo(),
Mirror: mset.mirrorInfo(),
}
resp.DidCreate = true
s.sendAPIResponse(client, acc, subject, reply, _EMPTY_, s.jsonResponse(&resp))
if node := mset.raftNode(); node != nil {
mset.sendCreateAdvisory()
}
}
}
// Fixed value ok for now.
const lostQuorumAdvInterval = 10 * time.Second
// Determines if we should send lost quorum advisory. We throttle these after first one.
func (mset *stream) shouldSendLostQuorum() bool {
mset.mu.Lock()
defer mset.mu.Unlock()
if time.Since(mset.lqsent) >= lostQuorumAdvInterval {
mset.lqsent = time.Now()
return true
}
return false
}
func (s *Server) sendStreamLostQuorumAdvisory(mset *stream) {
if mset == nil {
return
}
node, stream, acc := mset.raftNode(), mset.name(), mset.account()
if node == nil {
return
}
if !mset.shouldSendLostQuorum() {
return
}
s.Warnf("JetStream cluster stream "%s > %s" has NO quorum, stalled", acc.GetName(), stream)
subj := JSAdvisoryStreamQuorumLostPre + "." + stream
adv := &JSStreamQuorumLostAdvisory{
TypedEvent: TypedEvent{
Type: JSStreamQuorumLostAdvisoryType,
ID: nuid.Next(),
Time: time.Now().UTC(),
},
Stream: stream,
Replicas: s.replicas(node),
Domain: s.getOpts().JetStreamDomain,
}
// Send to the user"s account if not the system account.
if acc != s.SystemAccount() {
s.publishAdvisory(acc, subj, adv)
}
// Now do system level one. Place account info in adv, and nil account means system.
adv.Account = acc.GetName()
s.publishAdvisory(nil, subj, adv)
}
func (s *Server) sendStreamLeaderElectAdvisory(mset *stream) {
if mset == nil {
return
}
node, stream, acc := mset.raftNode(), mset.name(), mset.account()
if node == nil {
return
}
subj := JSAdvisoryStreamLeaderElectedPre + "." + stream
adv := &JSStreamLeaderElectedAdvisory{
TypedEvent: TypedEvent{
Type: JSStreamLeaderElectedAdvisoryType,
ID: nuid.Next(),
Time: time.Now().UTC(),
},
Stream: stream,
Leader: s.serverNameForNode(node.GroupLeader()),
Replicas: s.replicas(node),
Domain: s.getOpts().JetStreamDomain,
}
// Send to the user"s account if not the system account.
if acc != s.SystemAccount() {
s.publishAdvisory(acc, subj, adv)
}
// Now do system level one. Place account info in adv, and nil account means system.
adv.Account = acc.GetName()
s.publishAdvisory(nil, subj, adv)
}
// Will lookup a stream assignment.
// Lock should be held.
func (js *jetStream) streamAssignment(account, stream string) (sa *streamAssignment) {
cc := js.cluster
if cc == nil {
return nil
}
if as := cc.streams[account]; as != nil {
sa = as[stream]
}
return sa
}
// processStreamAssignment is called when followers have replicated an assignment.
func (js *jetStream) processStreamAssignment(sa *streamAssignment) bool {
js.mu.Lock()
s, cc := js.srv, js.cluster
accName, stream := sa.Client.serviceAccount(), sa.Config.Name
noMeta := cc == nil || cc.meta == nil
var ourID string
if !noMeta {
ourID = cc.meta.ID()
}
var isMember bool
if sa.Group != nil && ourID != _EMPTY_ {
isMember = sa.Group.isMember(ourID)
}
// Remove this stream from the inflight proposals
cc.removeInflightProposal(accName, sa.Config.Name)
if s == nil || noMeta {
js.mu.Unlock()
return false
}
accStreams := cc.streams[accName]
if accStreams == nil {
accStreams = make(map[string]*streamAssignment)
} else if osa := accStreams[stream]; osa != nil && osa != sa {
// Copy over private existing state from former SA.
sa.Group.node = osa.Group.node
sa.consumers = osa.consumers
sa.responded = osa.responded
sa.err = osa.err
}
// Update our state.
accStreams[stream] = sa
cc.streams[accName] = accStreams
hasResponded := sa.responded
js.mu.Unlock()
acc, err := s.LookupAccount(accName)
if err != nil {
ll := fmt.Sprintf("Account [%s] lookup for stream create failed: %v", accName, err)
if isMember {
if !hasResponded {
// If we can not lookup the account and we are a member, send this result back to the metacontroller leader.
result := &streamAssignmentResult{
Account: accName,
Stream: stream,
Response: &JSApiStreamCreateResponse{ApiResponse: ApiResponse{Type: JSApiStreamCreateResponseType}},
}
result.Response.Error = NewJSNoAccountError()
s.sendInternalMsgLocked(streamAssignmentSubj, _EMPTY_, nil, result)
}
s.Warnf(ll)
} else {
s.Debugf(ll)
}
return false
}
var didRemove bool
// Check if this is for us..
if isMember {
js.processClusterCreateStream(acc, sa)
} else if mset, _ := acc.lookupStream(sa.Config.Name); mset != nil {
// We have one here even though we are not a member. This can happen on re-assignment.
s.removeStream(ourID, mset, sa)
}
// If this stream assignment does not have a sync subject (bug) set that the meta-leader should check when elected.
if sa.Sync == _EMPTY_ {
js.mu.Lock()
cc.streamsCheck = true
js.mu.Unlock()
return false
}
return didRemove
}
// processUpdateStreamAssignment is called when followers have replicated an updated assignment.
func (js *jetStream) processUpdateStreamAssignment(sa *streamAssignment) {
js.mu.RLock()
s, cc := js.srv, js.cluster
js.mu.RUnlock()
if s == nil || cc == nil {
// TODO(dlc) - debug at least
return
}
accName := sa.Client.serviceAccount()
stream := sa.Config.Name
js.mu.Lock()
if cc.meta == nil {
js.mu.Unlock()
return
}
ourID := cc.meta.ID()
var isMember bool
if sa.Group != nil {
isMember = sa.Group.isMember(ourID)
}
accStreams := cc.streams[accName]
if accStreams == nil {
js.mu.Unlock()
return
}
osa := accStreams[stream]
if osa == nil {
js.mu.Unlock()
return
}
// Copy over private existing state from former SA.
sa.Group.node = osa.Group.node
sa.consumers = osa.consumers
sa.err = osa.err
// If we detect we are scaling down to 1, non-clustered, and we had a previous node, clear it here.
if sa.Config.Replicas == 1 && sa.Group.node != nil {
sa.Group.node = nil
}
// Update our state.
accStreams[stream] = sa
cc.streams[accName] = accStreams
// Make sure we respond if we are a member.
if isMember {
sa.responded = false
} else {
// Make sure to clean up any old node in case this stream moves back here.
sa.Group.node = nil
}
js.mu.Unlock()
acc, err := s.LookupAccount(accName)
if err != nil {
s.Warnf("Update Stream Account %s, error on lookup: %v", accName, err)
return
}
// Check if this is for us..
if isMember {
js.processClusterUpdateStream(acc, osa, sa)
} else if mset, _ := acc.lookupStream(sa.Config.Name); mset != nil {
// We have one here even though we are not a member. This can happen on re-assignment.
s.removeStream(ourID, mset, sa)
}
}
// Common function to remove ourself from this server.
// This can happen on re-assignment, move, etc
func (s *Server) removeStream(ourID string, mset *stream, nsa *streamAssignment) {
if mset == nil {
return
}
// Make sure to use the new stream assignment, not our own.
s.Debugf("JetStream removing stream "%s > %s" from this server", nsa.Client.serviceAccount(), nsa.Config.Name)
if node := mset.raftNode(); node != nil {
if node.Leader() {
node.StepDown(nsa.Group.Preferred)
}
node.ProposeRemovePeer(ourID)
// shut down monitor by shutting down raft
node.Delete()
}
// Make sure this node is no longer attached to our stream assignment.
if js, _ := s.getJetStreamCluster(); js != nil {
js.mu.Lock()
nsa.Group.node = nil
js.mu.Unlock()
}
// wait for monitor to be shut down
mset.monitorWg.Wait()
mset.stop(true, false)
}
// processClusterUpdateStream is called when we have a stream assignment that
// has been updated for an existing assignment and we are a member.
func (js *jetStream) processClusterUpdateStream(acc *Account, osa, sa *streamAssignment) {
if sa == nil {
return
}
js.mu.Lock()
s, rg := js.srv, sa.Group
client, subject, reply := sa.Client, sa.Subject, sa.Reply
alreadyRunning, numReplicas := osa.Group.node != nil, len(rg.Peers)
needsNode := rg.node == nil
storage, cfg := sa.Config.Storage, sa.Config
hasResponded := sa.responded
sa.responded = true
recovering := sa.recovering
js.mu.Unlock()
mset, err := acc.lookupStream(cfg.Name)
if err == nil && mset != nil {
// Make sure we have not had a new group assigned to us.
if osa.Group.Name != sa.Group.Name {
s.Warnf("JetStream cluster detected stream remapping for "%s > %s" from %q to %q",
acc, cfg.Name, osa.Group.Name, sa.Group.Name)
mset.removeNode()
alreadyRunning, needsNode = false, true
// Make sure to clear from original.
js.mu.Lock()
osa.Group.node = nil
js.mu.Unlock()
}
var needsSetLeader bool
if !alreadyRunning && numReplicas > 1 {
if needsNode {
mset.setLeader(false)
js.createRaftGroup(acc.GetName(), rg, storage)
}
mset.monitorWg.Add(1)
// Start monitoring..
s.startGoRoutine(func() { js.monitorStream(mset, sa, needsNode) })
} else if numReplicas == 1 && alreadyRunning {
// We downgraded to R1. Make sure we cleanup the raft node and the stream monitor.
mset.removeNode()
// Make sure we are leader now that we are R1.
needsSetLeader = true
// In case we need to shutdown the cluster specific subs, etc.
mset.setLeader(false)
js.mu.Lock()
rg.node = nil
js.mu.Unlock()
}
// Call update.
if err = mset.updateWithAdvisory(cfg, !recovering); err != nil {
s.Warnf("JetStream cluster error updating stream %q for account %q: %v", cfg.Name, acc.Name, err)
}
// Set the new stream assignment.
mset.setStreamAssignment(sa)
// Make sure we are the leader now that we are R1.
if needsSetLeader {
mset.setLeader(true)
}
}
// If not found we must be expanding into this node since if we are here we know we are a member.
if err == ErrJetStreamStreamNotFound {
js.processStreamAssignment(sa)
return
}
if err != nil {
js.mu.Lock()
sa.err = err
result := &streamAssignmentResult{
Account: sa.Client.serviceAccount(),
Stream: sa.Config.Name,
Response: &JSApiStreamCreateResponse{ApiResponse: ApiResponse{Type: JSApiStreamCreateResponseType}},
Update: true,
}
result.Response.Error = NewJSStreamGeneralError(err, Unless(err))
js.mu.Unlock()
// Send response to the metadata leader. They will forward to the user as needed.
s.sendInternalMsgLocked(streamAssignmentSubj, _EMPTY_, nil, result)
return
}
isLeader := mset.IsLeader()
// Check for missing syncSubject bug.
if isLeader && osa != nil && osa.Sync == _EMPTY_ {
if node := mset.raftNode(); node != nil {
node.StepDown()
}
return
}
// If we were a single node being promoted assume leadership role for purpose of responding.
if !hasResponded && !isLeader && !alreadyRunning {
isLeader = true
}
// Check if we should bail.
if !isLeader || hasResponded || recovering {
return
}
// Send our response.
var resp = JSApiStreamUpdateResponse{ApiResponse: ApiResponse{Type: JSApiStreamUpdateResponseType}}
resp.StreamInfo = &StreamInfo{
Created: mset.createdTime(),
State: mset.state(),
Config: mset.config(),
Cluster: js.clusterInfo(mset.raftGroup()),
Mirror: mset.mirrorInfo(),
Sources: mset.sourcesInfo(),
}
s.sendAPIResponse(client, acc, subject, reply, _EMPTY_, s.jsonResponse(&resp))
}
// processClusterCreateStream is called when we have a stream assignment that
// has been committed and this server is a member of the peer group.
func (js *jetStream) processClusterCreateStream(acc *Account, sa *streamAssignment) {
if sa == nil {
return
}
js.mu.RLock()
s, rg := js.srv, sa.Group
alreadyRunning := rg.node != nil
storage := sa.Config.Storage
js.mu.RUnlock()
// Process the raft group and make sure it"s running if needed.
err := js.createRaftGroup(acc.GetName(), rg, storage)
// If we are restoring, create the stream if we are R>1 and not the preferred who handles the
// receipt of the snapshot itself.
shouldCreate := true
if sa.Restore != nil {
if len(rg.Peers) == 1 || rg.node != nil && rg.node.ID() == rg.Preferred {
shouldCreate = false
} else {
sa.Restore = nil
}
}
// Our stream.
var mset *stream
// Process here if not restoring or not the leader.
if shouldCreate && err == nil {
// Go ahead and create or update the stream.
mset, err = acc.lookupStream(sa.Config.Name)
if err == nil && mset != nil {
osa := mset.streamAssignment()
// If we already have a stream assignment and they are the same exact config, short circuit here.
if osa != nil {
if reflect.DeepEqual(osa.Config, sa.Config) {
if sa.Group.Name == osa.Group.Name && reflect.DeepEqual(sa.Group.Peers, osa.Group.Peers) {
// Since this already exists we know it succeeded, just respond to this caller.
js.mu.RLock()
client, subject, reply, recovering := sa.Client, sa.Subject, sa.Reply, sa.recovering
js.mu.RUnlock()
if !recovering {
var resp = JSApiStreamCreateResponse{ApiResponse: ApiResponse{Type: JSApiStreamCreateResponseType}}
resp.StreamInfo = &StreamInfo{
Created: mset.createdTime(),
State: mset.state(),
Config: mset.config(),
Cluster: js.clusterInfo(mset.raftGroup()),
Sources: mset.sourcesInfo(),
Mirror: mset.mirrorInfo(),
}
s.sendAPIResponse(client, acc, subject, reply, _EMPTY_, s.jsonResponse(&resp))
}
return
} else {
// We had a bug where we could have multiple assignments for the same
// stream but with different group assignments, including multiple raft
// groups. So check for that here. We can only bet on the last one being
// consistent in the long run, so let it continue if we see this condition.
s.Warnf("JetStream cluster detected duplicate assignment for stream %q for account %q", sa.Config.Name, acc.Name)
if osa.Group.node != nil && osa.Group.node != sa.Group.node {
osa.Group.node.Delete()
osa.Group.node = nil
}
}
}
}
mset.setStreamAssignment(sa)
if err = mset.updateWithAdvisory(sa.Config, false); err != nil {
s.Warnf("JetStream cluster error updating stream %q for account %q: %v", sa.Config.Name, acc.Name, err)
if osa != nil {
// Process the raft group and make sure it"s running if needed.
js.createRaftGroup(acc.GetName(), osa.Group, storage)
mset.setStreamAssignment(osa)
}
if rg.node != nil {
rg.node.Delete()
rg.node = nil
}
}
} else if err == NewJSStreamNotFoundError() {
// Add in the stream here.
mset, err = acc.addStreamWithAssignment(sa.Config, nil, sa)
}
if mset != nil {
mset.setCreatedTime(sa.Created)
}
}
// This is an error condition.
if err != nil {
if IsNatsErr(err, JSStreamStoreFailedF) {
s.Warnf("Stream create failed for "%s > %s": %v", sa.Client.serviceAccount(), sa.Config.Name, err)
err = errStreamStoreFailed
}
js.mu.Lock()
sa.err = err
hasResponded := sa.responded
// If out of space do nothing for now.
if isOutOfSpaceErr(err) {
hasResponded = true
}
if rg.node != nil {
rg.node.Delete()
}
var result *streamAssignmentResult
if !hasResponded {
result = &streamAssignmentResult{
Account: sa.Client.serviceAccount(),
Stream: sa.Config.Name,
Response: &JSApiStreamCreateResponse{ApiResponse: ApiResponse{Type: JSApiStreamCreateResponseType}},
}
result.Response.Error = NewJSStreamCreateError(err, Unless(err))
}
js.mu.Unlock()
// Send response to the metadata leader. They will forward to the user as needed.
if result != nil {
s.sendInternalMsgLocked(streamAssignmentSubj, _EMPTY_, nil, result)
}
return
}
// Start our monitoring routine.
if rg.node != nil {
if !alreadyRunning {
if mset != nil {
mset.monitorWg.Add(1)
}
s.startGoRoutine(func() { js.monitorStream(mset, sa, false) })
}
} else {
// Single replica stream, process manually here.
// If we are restoring, process that first.
if sa.Restore != nil {
// We are restoring a stream here.
restoreDoneCh := s.processStreamRestore(sa.Client, acc, sa.Config, _EMPTY_, sa.Reply, _EMPTY_)
s.startGoRoutine(func() {
defer s.grWG.Done()
select {
case err := <-restoreDoneCh:
if err == nil {
mset, err = acc.lookupStream(sa.Config.Name)
if mset != nil {
mset.setStreamAssignment(sa)
mset.setCreatedTime(sa.Created)
}
}
if err != nil {
if mset != nil {
mset.delete()
}
js.mu.Lock()
sa.err = err
result := &streamAssignmentResult{
Account: sa.Client.serviceAccount(),
Stream: sa.Config.Name,
Restore: &JSApiStreamRestoreResponse{ApiResponse: ApiResponse{Type: JSApiStreamRestoreResponseType}},
}
result.Restore.Error = NewJSStreamRestoreError(err, Unless(err))
js.mu.Unlock()
// Send response to the metadata leader. They will forward to the user as needed.
b, _ := json.Marshal(result) // Avoids auto-processing and doing fancy json with newlines.
s.sendInternalMsgLocked(streamAssignmentSubj, _EMPTY_, nil, b)
return
}
js.processStreamLeaderChange(mset, true)
// Check to see if we have restored consumers here.
// These are not currently assigned so we will need to do so here.
if consumers := mset.getPublicConsumers(); len(consumers) > 0 {
js.mu.RLock()
cc := js.cluster
js.mu.RUnlock()
for _, o := range consumers {
name, cfg := o.String(), o.config()
rg := cc.createGroupForConsumer(&cfg, sa)
// Place our initial state here as well for assignment distribution.
ca := &consumerAssignment{
Group: rg,
Stream: sa.Config.Name,
Name: name,
Config: &cfg,
Client: sa.Client,
Created: o.createdTime(),
}
addEntry := encodeAddConsumerAssignment(ca)
cc.meta.ForwardProposal(addEntry)
// Check to make sure we see the assignment.
go func() {
ticker := time.NewTicker(time.Second)
defer ticker.Stop()
for range ticker.C {
js.mu.RLock()
ca, meta := js.consumerAssignment(ca.Client.serviceAccount(), sa.Config.Name, name), cc.meta
js.mu.RUnlock()
if ca == nil {
s.Warnf("Consumer assignment has not been assigned, retrying")
if meta != nil {
meta.ForwardProposal(addEntry)
} else {
return
}
} else {
return
}
}
}()
}
}
case <-s.quitCh:
return
}
})
} else {
js.processStreamLeaderChange(mset, true)
}
}
}
// processStreamRemoval is called when followers have replicated an assignment.
func (js *jetStream) processStreamRemoval(sa *streamAssignment) {
js.mu.Lock()
s, cc := js.srv, js.cluster
if s == nil || cc == nil || cc.meta == nil {
// TODO(dlc) - debug at least
js.mu.Unlock()
return
}
stream := sa.Config.Name
isMember := sa.Group.isMember(cc.meta.ID())
wasLeader := cc.isStreamLeader(sa.Client.serviceAccount(), stream)
// Check if we already have this assigned.
accStreams := cc.streams[sa.Client.serviceAccount()]
needDelete := accStreams != nil && accStreams[stream] != nil
if needDelete {
delete(accStreams, stream)
if len(accStreams) == 0 {
delete(cc.streams, sa.Client.serviceAccount())
}
}
js.mu.Unlock()
if needDelete {
js.processClusterDeleteStream(sa, isMember, wasLeader)
}
}
func (js *jetStream) processClusterDeleteStream(sa *streamAssignment, isMember, wasLeader bool) {
if sa == nil {
return
}
js.mu.RLock()
s := js.srv
node := sa.Group.node
hadLeader := node == nil || node.GroupLeader() != noLeader
offline := s.allPeersOffline(sa.Group)
var isMetaLeader bool
if cc := js.cluster; cc != nil {
isMetaLeader = cc.isLeader()
}
recovering := sa.recovering
js.mu.RUnlock()
stopped := false
var resp = JSApiStreamDeleteResponse{ApiResponse: ApiResponse{Type: JSApiStreamDeleteResponseType}}
var err error
var acc *Account
// Go ahead and delete the stream if we have it and the account here.
if acc, _ = s.LookupAccount(sa.Client.serviceAccount()); acc != nil {
if mset, _ := acc.lookupStream(sa.Config.Name); mset != nil {
// shut down monitor by shutting down raft
if n := mset.raftNode(); n != nil {
n.Delete()
}
// wait for monitor to be shut down
mset.monitorWg.Wait()
err = mset.stop(true, wasLeader)
stopped = true
}
}
// Always delete the node if present.
if node != nil {
node.Delete()
}
// This is a stop gap cleanup in case
// 1) the account does not exist (and mset couldn"t be stopped) and/or
// 2) node was nil (and couldn"t be deleted)
if !stopped || node == nil {
if sacc := s.SystemAccount(); sacc != nil {
os.RemoveAll(filepath.Join(js.config.StoreDir, sacc.GetName(), defaultStoreDirName, sa.Group.Name))
// cleanup dependent consumer groups
if !stopped {
for _, ca := range sa.consumers {
os.RemoveAll(filepath.Join(js.config.StoreDir, sacc.GetName(), defaultStoreDirName, ca.Group.Name))
}
}
}
}
accDir := filepath.Join(js.config.StoreDir, sa.Client.serviceAccount())
streamDir := filepath.Join(accDir, streamsDir)
os.RemoveAll(filepath.Join(streamDir, sa.Config.Name))
// no op if not empty
os.Remove(streamDir)
os.Remove(accDir)
// Normally we want only the leader to respond here, but if we had no leader then all members will respond to make
// sure we get feedback to the user.
if !isMember || (hadLeader && !wasLeader) {
// If all the peers are offline and we are the meta leader we will also respond, so suppress returning here.
if !(offline && isMetaLeader) {
return
}
}
// Do not respond if the account does not exist any longer
if acc == nil || recovering {
return
}
if err != nil {
resp.Error = NewJSStreamGeneralError(err, Unless(err))
s.sendAPIErrResponse(sa.Client, acc, sa.Subject, sa.Reply, _EMPTY_, s.jsonResponse(resp))
} else {
resp.Success = true
s.sendAPIResponse(sa.Client, acc, sa.Subject, sa.Reply, _EMPTY_, s.jsonResponse(resp))
}
}
// processConsumerAssignment is called when followers have replicated an assignment for a consumer.
func (js *jetStream) processConsumerAssignment(ca *consumerAssignment) {
js.mu.RLock()
s, cc := js.srv, js.cluster
accName, stream, consumerName := ca.Client.serviceAccount(), ca.Stream, ca.Name
noMeta := cc == nil || cc.meta == nil
var ourID string
if !noMeta {
ourID = cc.meta.ID()
}
var isMember bool
if ca.Group != nil && ourID != _EMPTY_ {
isMember = ca.Group.isMember(ourID)
}
js.mu.RUnlock()
if s == nil || noMeta {
return
}
sa := js.streamAssignment(accName, stream)
if sa == nil {
s.Debugf("Consumer create failed, could not locate stream "%s > %s"", accName, stream)
return
}
// Might need this below.
numReplicas := sa.Config.Replicas
// Track if this existed already.
var wasExisting bool
// Check if we have an existing consumer assignment.
js.mu.Lock()
if sa.consumers == nil {
sa.consumers = make(map[string]*consumerAssignment)
} else if oca := sa.consumers[ca.Name]; oca != nil {
wasExisting = true
// Copy over private existing state from former SA.
ca.Group.node = oca.Group.node
ca.responded = oca.responded
ca.err = oca.err
}
// Capture the optional state. We will pass it along if we are a member to apply.
// This is only applicable when restoring a stream with consumers.
state := ca.State
ca.State = nil
// Place into our internal map under the stream assignment.
// Ok to replace an existing one, we check on process call below.
sa.consumers[ca.Name] = ca
js.mu.Unlock()
acc, err := s.LookupAccount(accName)
if err != nil {
ll := fmt.Sprintf("Account [%s] lookup for consumer create failed: %v", accName, err)
if isMember {
if !js.isMetaRecovering() {
// If we can not lookup the account and we are a member, send this result back to the metacontroller leader.
result := &consumerAssignmentResult{
Account: accName,
Stream: stream,
Consumer: consumerName,
Response: &JSApiConsumerCreateResponse{ApiResponse: ApiResponse{Type: JSApiConsumerCreateResponseType}},
}
result.Response.Error = NewJSNoAccountError()
s.sendInternalMsgLocked(consumerAssignmentSubj, _EMPTY_, nil, result)
}
s.Warnf(ll)
} else {
s.Debugf(ll)
}
return
}
// Check if this is for us..
if isMember {
js.processClusterCreateConsumer(ca, state, wasExisting)
} else {
// We need to be removed here, we are no longer assigned.
// Grab consumer if we have it.
var o *consumer
if mset, _ := acc.lookupStream(sa.Config.Name); mset != nil {
o = mset.lookupConsumer(ca.Name)
}
// Check if we have a raft node running, meaning we are no longer part of the group but were.
js.mu.Lock()
if node := ca.Group.node; node != nil {
// We have one here even though we are not a member. This can happen on re-assignment.
s.Debugf("JetStream removing consumer "%s > %s > %s" from this server", sa.Client.serviceAccount(), sa.Config.Name, ca.Name)
if node.Leader() {
s.Debugf("JetStream consumer "%s > %s > %s" is being removed and was the leader, will perform stepdown",
sa.Client.serviceAccount(), sa.Config.Name, ca.Name)
peers, cn := node.Peers(), s.cachedClusterName()
migrating := numReplicas != len(peers)
// Select a new peer to transfer to. If we are a migrating make sure its from the new cluster.
var npeer string
for _, r := range peers {
if !r.Current {
continue
}
if !migrating {
npeer = r.ID
break
} else if sir, ok := s.nodeToInfo.Load(r.ID); ok && sir != nil {
si := sir.(nodeInfo)
if si.cluster != cn {
npeer = r.ID
break
}
}
}
// Clear the raftnode from our consumer so that a subsequent o.delete will not also issue a stepdown.
if o != nil {
o.clearRaftNode()
}
// Manually handle the stepdown and deletion of the node.
node.UpdateKnownPeers(ca.Group.Peers)
node.StepDown(npeer)
node.Delete()
} else {
node.UpdateKnownPeers(ca.Group.Peers)
}
}
// Always clear the old node.
ca.Group.node = nil
ca.err = nil
js.mu.Unlock()
if o != nil {
o.deleteWithoutAdvisory()
}
}
}
func (js *jetStream) processConsumerRemoval(ca *consumerAssignment) {
js.mu.Lock()
s, cc := js.srv, js.cluster
if s == nil || cc == nil || cc.meta == nil {
// TODO(dlc) - debug at least
js.mu.Unlock()
return
}
isMember := ca.Group.isMember(cc.meta.ID())
wasLeader := cc.isConsumerLeader(ca.Client.serviceAccount(), ca.Stream, ca.Name)
// Delete from our state.
var needDelete bool
if accStreams := cc.streams[ca.Client.serviceAccount()]; accStreams != nil {
if sa := accStreams[ca.Stream]; sa != nil && sa.consumers != nil && sa.consumers[ca.Name] != nil {
needDelete = true
delete(sa.consumers, ca.Name)
}
}
js.mu.Unlock()
if needDelete {
js.processClusterDeleteConsumer(ca, isMember, wasLeader)
}
}
type consumerAssignmentResult struct {
Account string `json:"account"`
Stream string `json:"stream"`
Consumer string `json:"consumer"`
Response *JSApiConsumerCreateResponse `json:"response,omitempty"`
}
// processClusterCreateConsumer is when we are a member of the group and need to create the consumer.
func (js *jetStream) processClusterCreateConsumer(ca *consumerAssignment, state *ConsumerState, wasExisting bool) {
if ca == nil {
return
}
js.mu.RLock()
s := js.srv
rg := ca.Group
alreadyRunning := rg != nil && rg.node != nil
accName, stream, consumer := ca.Client.serviceAccount(), ca.Stream, ca.Name
js.mu.RUnlock()
acc, err := s.LookupAccount(accName)
if err != nil {
s.Warnf("JetStream cluster failed to lookup axccount %q: %v", accName, err)
return
}
// Go ahead and create or update the consumer.
mset, err := acc.lookupStream(stream)
if err != nil {
if !js.isMetaRecovering() {
js.mu.Lock()
s.Warnf("Consumer create failed, could not locate stream "%s > %s > %s"", ca.Client.serviceAccount(), ca.Stream, ca.Name)
ca.err = NewJSStreamNotFoundError()
result := &consumerAssignmentResult{
Account: ca.Client.serviceAccount(),
Stream: ca.Stream,
Consumer: ca.Name,
Response: &JSApiConsumerCreateResponse{ApiResponse: ApiResponse{Type: JSApiConsumerCreateResponseType}},
}
result.Response.Error = NewJSStreamNotFoundError()
s.sendInternalMsgLocked(consumerAssignmentSubj, _EMPTY_, nil, result)
js.mu.Unlock()
}
return
}
// Check if we already have this consumer running.
o := mset.lookupConsumer(consumer)
if !alreadyRunning {
// Process the raft group and make sure its running if needed.
storage := mset.config().Storage
if ca.Config.MemoryStorage {
storage = MemoryStorage
}
js.createRaftGroup(accName, rg, storage)
} else {
// If we are clustered update the known peers.
js.mu.RLock()
if node := rg.node; node != nil {
node.UpdateKnownPeers(ca.Group.Peers)
}
js.mu.RUnlock()
}
// Check if we already have this consumer running.
var didCreate, isConfigUpdate, needsLocalResponse bool
if o == nil {
// Add in the consumer if needed.
if o, err = mset.addConsumerWithAssignment(ca.Config, ca.Name, ca, false); err == nil {
didCreate = true
}
} else {
// This consumer exists.
// Only update if config is really different.
cfg := o.config()
if isConfigUpdate = !reflect.DeepEqual(&cfg, ca.Config); isConfigUpdate {
// Call into update, ignore consumer exists error here since this means an old deliver subject is bound
// which can happen on restart etc.
if err := o.updateConfig(ca.Config); err != nil && err != NewJSConsumerNameExistError() {
// This is essentially an update that has failed. Respond back to metaleader if we are not recovering.
js.mu.RLock()
if !js.metaRecovering {
result := &consumerAssignmentResult{
Account: accName,
Stream: stream,
Consumer: consumer,
Response: &JSApiConsumerCreateResponse{ApiResponse: ApiResponse{Type: JSApiConsumerCreateResponseType}},
}
result.Response.Error = NewJSConsumerNameExistError()
s.sendInternalMsgLocked(consumerAssignmentSubj, _EMPTY_, nil, result)
}
s.Warnf("Consumer create failed during update for "%s > %s > %s": %v", ca.Client.serviceAccount(), ca.Stream, ca.Name, err)
js.mu.RUnlock()
return
}
}
var sendState bool
js.mu.RLock()
n := rg.node
// Check if we already had a consumer assignment and its still pending.
cca, oca := ca, o.consumerAssignment()
if oca != nil {
if !oca.responded {
// We can"t override info for replying here otherwise leader once elected can not respond.
// So copy over original client and the reply from the old ca.
cac := *ca
cac.Client = oca.Client
cac.Reply = oca.Reply
cca = &cac
needsLocalResponse = true
}
// If we look like we are scaling up, let"s send our current state to the group.
sendState = len(ca.Group.Peers) > len(oca.Group.Peers) && o.IsLeader() && n != nil
// Signal that this is an update
if ca.Reply != _EMPTY_ {
isConfigUpdate = true
}
}
js.mu.RUnlock()
if sendState {
if snap, err := o.store.EncodedState(); err == nil {
n.SendSnapshot(snap)
}
}
// Set CA for our consumer.
o.setConsumerAssignment(cca)
s.Debugf("JetStream cluster, consumer was already running")
}
// If we have an initial state set apply that now.
if state != nil && o != nil {
o.mu.Lock()
err = o.setStoreState(state)
o.mu.Unlock()
}
if err != nil {
if IsNatsErr(err, JSConsumerStoreFailedErrF) {
s.Warnf("Consumer create failed for "%s > %s > %s": %v", ca.Client.serviceAccount(), ca.Stream, ca.Name, err)
err = errConsumerStoreFailed
}
js.mu.Lock()
ca.err = err
hasResponded := ca.responded
// If out of space do nothing for now.
if isOutOfSpaceErr(err) {
hasResponded = true
}
if rg.node != nil {
rg.node.Delete()
}
var result *consumerAssignmentResult
if !hasResponded && !js.metaRecovering {
result = &consumerAssignmentResult{
Account: ca.Client.serviceAccount(),
Stream: ca.Stream,
Consumer: ca.Name,
Response: &JSApiConsumerCreateResponse{ApiResponse: ApiResponse{Type: JSApiConsumerCreateResponseType}},
}
result.Response.Error = NewJSConsumerCreateError(err, Unless(err))
} else if err == errNoInterest {
// This is a stranded ephemeral, let"s clean this one up.
subject := fmt.Sprintf(JSApiConsumerDeleteT, ca.Stream, ca.Name)
mset.outq.send(newJSPubMsg(subject, _EMPTY_, _EMPTY_, nil, nil, nil, 0))
}
js.mu.Unlock()
if result != nil {
// Send response to the metadata leader. They will forward to the user as needed.
b, _ := json.Marshal(result) // Avoids auto-processing and doing fancy json with newlines.
s.sendInternalMsgLocked(consumerAssignmentSubj, _EMPTY_, nil, b)
}
} else {
if didCreate {
o.setCreatedTime(ca.Created)
} else {
// Check for scale down to 1..
if rg.node != nil && len(rg.Peers) == 1 {
o.clearNode()
o.setLeader(true)
// Need to clear from rg too.
js.mu.Lock()
rg.node = nil
client, subject, reply := ca.Client, ca.Subject, ca.Reply
js.mu.Unlock()
var resp = JSApiConsumerCreateResponse{ApiResponse: ApiResponse{Type: JSApiConsumerCreateResponseType}}
resp.ConsumerInfo = o.info()
s.sendAPIResponse(client, acc, subject, reply, _EMPTY_, s.jsonResponse(&resp))
return
}
}
if rg.node == nil {
// Single replica consumer, process manually here.
js.mu.Lock()
// Force response in case we think this is an update.
if !js.metaRecovering && isConfigUpdate {
ca.responded = false
}
js.mu.Unlock()
js.processConsumerLeaderChange(o, true)
} else {
// Clustered consumer.
// Start our monitoring routine if needed.
if !alreadyRunning && !o.isMonitorRunning() {
s.startGoRoutine(func() { js.monitorConsumer(o, ca) })
}
// For existing consumer, only send response if not recovering.
if wasExisting && !js.isMetaRecovering() {
if o.IsLeader() || (!didCreate && needsLocalResponse) {
// Process if existing as an update. Double check that this is not recovered.
js.mu.RLock()
client, subject, reply, recovering := ca.Client, ca.Subject, ca.Reply, ca.recovering
js.mu.RUnlock()
if !recovering {
var resp = JSApiConsumerCreateResponse{ApiResponse: ApiResponse{Type: JSApiConsumerCreateResponseType}}
resp.ConsumerInfo = o.info()
s.sendAPIResponse(client, acc, subject, reply, _EMPTY_, s.jsonResponse(&resp))
}
}
}
}
}
}
func (js *jetStream) processClusterDeleteConsumer(ca *consumerAssignment, isMember, wasLeader bool) {
if ca == nil {
return
}
js.mu.RLock()
s := js.srv
node := ca.Group.node
offline := s.allPeersOffline(ca.Group)
var isMetaLeader bool
if cc := js.cluster; cc != nil {
isMetaLeader = cc.isLeader()
}
recovering := ca.recovering
js.mu.RUnlock()
stopped := false
var resp = JSApiConsumerDeleteResponse{ApiResponse: ApiResponse{Type: JSApiConsumerDeleteResponseType}}
var err error
var acc *Account
// Go ahead and delete the consumer if we have it and the account.
if acc, _ = s.LookupAccount(ca.Client.serviceAccount()); acc != nil {
if mset, _ := acc.lookupStream(ca.Stream); mset != nil {
if o := mset.lookupConsumer(ca.Name); o != nil {
err = o.stopWithFlags(true, false, true, wasLeader)
stopped = true
}
}
}
// Always delete the node if present.
if node != nil {
node.Delete()
}
// This is a stop gap cleanup in case
// 1) the account does not exist (and mset consumer couldn"t be stopped) and/or
// 2) node was nil (and couldn"t be deleted)
if !stopped || node == nil {
if sacc := s.SystemAccount(); sacc != nil {
os.RemoveAll(filepath.Join(js.config.StoreDir, sacc.GetName(), defaultStoreDirName, ca.Group.Name))
}
}
if !wasLeader || ca.Reply == _EMPTY_ {
if !(offline && isMetaLeader) {
return
}
}
// Do not respond if the account does not exist any longer or this is during recovery.
if acc == nil || recovering {
return
}
if err != nil {
resp.Error = NewJSStreamNotFoundError(Unless(err))
s.sendAPIErrResponse(ca.Client, acc, ca.Subject, ca.Reply, _EMPTY_, s.jsonResponse(resp))
} else {
resp.Success = true
s.sendAPIResponse(ca.Client, acc, ca.Subject, ca.Reply, _EMPTY_, s.jsonResponse(resp))
}
}
// Returns the consumer assignment, or nil if not present.
// Lock should be held.
func (js *jetStream) consumerAssignment(account, stream, consumer string) *consumerAssignment {
if sa := js.streamAssignment(account, stream); sa != nil {
return sa.consumers[consumer]
}
return nil
}
// consumerAssigned informs us if this server has this consumer assigned.
func (jsa *jsAccount) consumerAssigned(stream, consumer string) bool {
jsa.mu.RLock()
js, acc := jsa.js, jsa.account
jsa.mu.RUnlock()
if js == nil {
return false
}
js.mu.RLock()
defer js.mu.RUnlock()
return js.cluster.isConsumerAssigned(acc, stream, consumer)
}
// Read lock should be held.
func (cc *jetStreamCluster) isConsumerAssigned(a *Account, stream, consumer string) bool {
// Non-clustered mode always return true.
if cc == nil {
return true
}
if cc.meta == nil {
return false
}
var sa *streamAssignment
accStreams := cc.streams[a.Name]
if accStreams != nil {
sa = accStreams[stream]
}
if sa == nil {
// TODO(dlc) - This should not happen.
return false
}
ca := sa.consumers[consumer]
if ca == nil {
return false
}
rg := ca.Group
// Check if we are the leader of this raftGroup assigned to the stream.
ourID := cc.meta.ID()
for _, peer := range rg.Peers {
if peer == ourID {
return true
}
}
return false
}
// Returns our stream and underlying raft node.
func (o *consumer) streamAndNode() (*stream, RaftNode) {
if o == nil {
return nil, nil
}
o.mu.RLock()
defer o.mu.RUnlock()
return o.mset, o.node
}
// Return the replica count for this consumer. If the consumer has been
// stopped, this will return an error.
func (o *consumer) replica() (int, error) {
o.mu.RLock()
oCfg := o.cfg
mset := o.mset
o.mu.RUnlock()
if mset == nil {
return 0, errBadConsumer
}
sCfg := mset.config()
return oCfg.replicas(&sCfg), nil
}
func (o *consumer) raftGroup() *raftGroup {
if o == nil {
return nil
}
o.mu.RLock()
defer o.mu.RUnlock()
if o.ca == nil {
return nil
}
return o.ca.Group
}
func (o *consumer) clearRaftNode() {
if o == nil {
return
}
o.mu.Lock()
defer o.mu.Unlock()
o.node = nil
}
func (o *consumer) raftNode() RaftNode {
if o == nil {
return nil
}
o.mu.RLock()
defer o.mu.RUnlock()
return o.node
}
func (js *jetStream) monitorConsumer(o *consumer, ca *consumerAssignment) {
s, n, cc := js.server(), o.raftNode(), js.cluster
defer s.grWG.Done()
if n == nil {
s.Warnf("No RAFT group for "%s > %s > %s"", o.acc.Name, ca.Stream, ca.Name)
return
}
// Make sure only one is running.
if o.checkInMonitor() {
return
}
defer o.clearMonitorRunning()
qch, lch, aq, uch, ourPeerId := n.QuitC(), n.LeadChangeC(), n.ApplyQ(), o.updateC(), cc.meta.ID()
s.Debugf("Starting consumer monitor for "%s > %s > %s" [%s]", o.acc.Name, ca.Stream, ca.Name, n.Group())
defer s.Debugf("Exiting consumer monitor for "%s > %s > %s" [%s]", o.acc.Name, ca.Stream, ca.Name, n.Group())
// Make sure to stop the raft group on exit to prevent accidental memory bloat.
defer n.Stop()
const (
compactInterval = 2 * time.Minute
compactSizeMin = 64 * 1024 // What is stored here is always small for consumers.
compactNumMin = 1024
minSnapDelta = 10 * time.Second
)
// Spread these out for large numbers on server restart.
rci := time.Duration(rand.Int63n(int64(time.Minute)))
t := time.NewTicker(compactInterval + rci)
defer t.Stop()
// Highwayhash key for generating hashes.
key := make([]byte, 32)
rand.Read(key)
// Hash of the last snapshot (fixed size in memory).
var lastSnap []byte
var lastSnapTime time.Time
doSnapshot := func() {
// Bail if trying too fast and not in a forced situation.
if time.Since(lastSnapTime) < minSnapDelta {
return
}
// Check several things to see if we need a snapshot.
ne, nb := n.Size()
if !n.NeedSnapshot() {
// Check if we should compact etc. based on size of log.
if ne < compactNumMin && nb < compactSizeMin {
return
}
}
if snap, err := o.store.EncodedState(); err == nil {
hash := highwayhash.Sum(snap, key)
// If the state hasn"t changed but the log has gone way over
// the compaction size then we will want to compact anyway.
// This can happen for example when a pull consumer fetches a
// lot on an idle stream, log entries get distributed but the
// state never changes, therefore the log never gets compacted.
if !bytes.Equal(hash[:], lastSnap) || ne >= compactNumMin || nb >= compactSizeMin {
if err := n.InstallSnapshot(snap); err == nil {
lastSnap, lastSnapTime = hash[:], time.Now()
} else if err != errNoSnapAvailable && err != errNodeClosed {
s.Warnf("Failed to install snapshot for "%s > %s > %s" [%s]: %v", o.acc.Name, ca.Stream, ca.Name, n.Group(), err)
}
}
}
}
// For migration tracking.
var mmt *time.Ticker
var mmtc <-chan time.Time
startMigrationMonitoring := func() {
if mmt == nil {
mmt = time.NewTicker(500 * time.Millisecond)
mmtc = mmt.C
}
}
stopMigrationMonitoring := func() {
if mmt != nil {
mmt.Stop()
mmt, mmtc = nil, nil
}
}
defer stopMigrationMonitoring()
// Track if we are leader.
var isLeader bool
recovering := true
for {
select {
case <-s.quitCh:
return
case <-qch:
return
case <-aq.ch:
ces := aq.pop()
for _, ce := range ces {
// No special processing needed for when we are caught up on restart.
if ce == nil {
recovering = false
if n.NeedSnapshot() {
doSnapshot()
}
continue
}
if err := js.applyConsumerEntries(o, ce, isLeader); err == nil {
ne, nb := n.Applied(ce.Index)
// If we have at least min entries to compact, go ahead and snapshot/compact.
if nb > 0 && ne >= compactNumMin || nb > compactSizeMin {
doSnapshot()
}
} else {
s.Warnf("Error applying consumer entries to "%s > %s"", ca.Client.serviceAccount(), ca.Name)
}
}
aq.recycle(&ces)
case isLeader = <-lch:
if recovering && !isLeader {
js.setConsumerAssignmentRecovering(ca)
}
if err := js.processConsumerLeaderChange(o, isLeader); err == nil && isLeader {
doSnapshot()
}
// We may receive a leader change after the consumer assignment which would cancel us
// monitoring for this closely. So re-assess our state here as well.
// Or the old leader is no longer part of the set and transferred leadership
// for this leader to resume with removal
rg := o.raftGroup()
// Check for migrations (peer count and replica count differ) here.
// We set the state on the stream assignment update below.
replicas, err := o.replica()
if err != nil {
continue
}
if isLeader && len(rg.Peers) != replicas {
startMigrationMonitoring()
} else {
stopMigrationMonitoring()
}
case <-uch:
// keep consumer assignment current
ca = o.consumerAssignment()
// We get this when we have a new consumer assignment caused by an update.
// We want to know if we are migrating.
rg := o.raftGroup()
// keep peer list up to date with config
js.checkPeers(rg)
// If we are migrating, monitor for the new peers to be caught up.
replicas, err := o.replica()
if err != nil {
continue
}
if isLeader && len(rg.Peers) != replicas {
startMigrationMonitoring()
} else {
stopMigrationMonitoring()
}
case <-mmtc:
if !isLeader {
// We are no longer leader, so not our job.
stopMigrationMonitoring()
continue
}
rg := o.raftGroup()
ci := js.clusterInfo(rg)
replicas, err := o.replica()
if err != nil {
continue
}
if len(rg.Peers) <= replicas {
// Migration no longer happening, so not our job anymore
stopMigrationMonitoring()
continue
}
newPeers, oldPeers, newPeerSet, _ := genPeerInfo(rg.Peers, len(rg.Peers)-replicas)
// If we are part of the new peerset and we have been passed the baton.
// We will handle scale down.
if newPeerSet[ourPeerId] {
for _, p := range oldPeers {
n.ProposeRemovePeer(p)
}
cca := ca.copyGroup()
cca.Group.Peers = newPeers
cca.Group.Cluster = s.cachedClusterName()
cc.meta.ForwardProposal(encodeAddConsumerAssignment(cca))
s.Noticef("Scaling down "%s > %s > %s" to %+v", ca.Client.serviceAccount(), ca.Stream, ca.Name, s.peerSetToNames(newPeers))
} else {
var newLeaderPeer, newLeader, newCluster string
neededCurrent, current := replicas/2+1, 0
for _, r := range ci.Replicas {
if r.Current && newPeerSet[r.Peer] {
current++
if newCluster == _EMPTY_ {
newLeaderPeer, newLeader, newCluster = r.Peer, r.Name, r.cluster
}
}
}
// Check if we have a quorom
if current >= neededCurrent {
s.Noticef("Transfer of consumer leader for "%s > %s > %s" to "%s"", ca.Client.serviceAccount(), ca.Stream, ca.Name, newLeader)
n.StepDown(newLeaderPeer)
}
}
case <-t.C:
doSnapshot()
}
}
}
func (js *jetStream) applyConsumerEntries(o *consumer, ce *CommittedEntry, isLeader bool) error {
for _, e := range ce.Entries {
if e.Type == EntrySnapshot {
// No-op needed?
state, err := decodeConsumerState(e.Data)
if err != nil {
if mset, node := o.streamAndNode(); mset != nil && node != nil {
s := js.srv
s.Errorf("JetStream cluster could not decode consumer snapshot for "%s > %s > %s" [%s]",
mset.account(), mset.name(), o, node.Group())
}
panic(err.Error())
}
if err = o.store.Update(state); err != nil {
o.mu.RLock()
s, acc, mset, name := o.srv, o.acc, o.mset, o.name
o.mu.RUnlock()
if s != nil && mset != nil {
s.Warnf("Consumer "%s > %s > %s" error on store update from snapshot entry: %v", acc, mset.name(), name, err)
}
} else if state, err := o.store.State(); err == nil {
// See if we need to process this update if our parent stream is not a limits policy stream.
o.mu.RLock()
mset := o.mset
shouldProcessAcks := mset != nil && o.retention != LimitsPolicy
o.mu.RUnlock()
// We should make sure to update the acks.
if shouldProcessAcks {
var ss StreamState
mset.store.FastState(&ss)
for seq := ss.FirstSeq; seq <= state.AckFloor.Stream; seq++ {
mset.ackMsg(o, seq)
}
}
}
} else if e.Type == EntryRemovePeer {
js.mu.RLock()
var ourID string
if js.cluster != nil && js.cluster.meta != nil {
ourID = js.cluster.meta.ID()
}
js.mu.RUnlock()
if peer := string(e.Data); peer == ourID {
shouldRemove := true
if mset := o.getStream(); mset != nil {
if sa := mset.streamAssignment(); sa != nil && sa.Group != nil {
js.mu.RLock()
shouldRemove = !sa.Group.isMember(ourID)
js.mu.RUnlock()
}
}
if shouldRemove {
o.stopWithFlags(true, false, false, false)
}
}
return nil
} else if e.Type == EntryAddPeer {
// Ignore for now.
} else {
buf := e.Data
switch entryOp(buf[0]) {
case updateDeliveredOp:
// These are handled in place in leaders.
if !isLeader {
dseq, sseq, dc, ts, err := decodeDeliveredUpdate(buf[1:])
if err != nil {
if mset, node := o.streamAndNode(); mset != nil && node != nil {
s := js.srv
s.Errorf("JetStream cluster could not decode consumer delivered update for "%s > %s > %s" [%s]",
mset.account(), mset.name(), o, node.Group())
}
panic(err.Error())
}
// Make sure to update delivered under the lock.
o.mu.Lock()
err = o.store.UpdateDelivered(dseq, sseq, dc, ts)
o.ldt = time.Now()
o.mu.Unlock()
if err != nil {
panic(err.Error())
}
}
case updateAcksOp:
dseq, sseq, err := decodeAckUpdate(buf[1:])
if err != nil {
if mset, node := o.streamAndNode(); mset != nil && node != nil {
s := js.srv
s.Errorf("JetStream cluster could not decode consumer ack update for "%s > %s > %s" [%s]",
mset.account(), mset.name(), o, node.Group())
}
panic(err.Error())
}
o.processReplicatedAck(dseq, sseq)
case updateSkipOp:
o.mu.Lock()
if !o.isLeader() {
var le = binary.LittleEndian
if sseq := le.Uint64(buf[1:]); sseq > o.sseq {
o.sseq = sseq
}
}
o.mu.Unlock()
case addPendingRequest:
o.mu.Lock()
if !o.isLeader() {
if o.prm == nil {
o.prm = make(map[string]struct{})
}
o.prm[string(buf[1:])] = struct{}{}
}
o.mu.Unlock()
case removePendingRequest:
o.mu.Lock()
if !o.isLeader() {
if o.prm != nil {
delete(o.prm, string(buf[1:]))
}
}
o.mu.Unlock()
default:
panic(fmt.Sprintf("JetStream Cluster Unknown group entry op type! %v", entryOp(buf[0])))
}
}
}
return nil
}
func (o *consumer) processReplicatedAck(dseq, sseq uint64) {
o.mu.Lock()
// Update activity.
o.lat = time.Now()
// Do actual ack update to store.
o.store.UpdateAcks(dseq, sseq)
mset := o.mset
if mset == nil || o.retention == LimitsPolicy {
o.mu.Unlock()
return
}
var sagap uint64
if o.cfg.AckPolicy == AckAll {
if o.isLeader() {
sagap = sseq - o.asflr
} else {
// We are a follower so only have the store state, so read that in.
state, err := o.store.State()
if err != nil {
o.mu.Unlock()
return
}
sagap = sseq - state.AckFloor.Stream
}
}
o.mu.Unlock()
if sagap > 1 {
// FIXME(dlc) - This is very inefficient, will need to fix.
for seq := sseq; seq > sseq-sagap; seq-- {
mset.ackMsg(o, seq)
}
} else {
mset.ackMsg(o, sseq)
}
}
var errBadAckUpdate = errors.New("jetstream cluster bad replicated ack update")
var errBadDeliveredUpdate = errors.New("jetstream cluster bad replicated delivered update")
func decodeAckUpdate(buf []byte) (dseq, sseq uint64, err error) {
var bi, n int
if dseq, n = binary.Uvarint(buf); n < 0 {
return 0, 0, errBadAckUpdate
}
bi += n
if sseq, n = binary.Uvarint(buf[bi:]); n < 0 {
return 0, 0, errBadAckUpdate
}
return dseq, sseq, nil
}
func decodeDeliveredUpdate(buf []byte) (dseq, sseq, dc uint64, ts int64, err error) {
var bi, n int
if dseq, n = binary.Uvarint(buf); n < 0 {
return 0, 0, 0, 0, errBadDeliveredUpdate
}
bi += n
if sseq, n = binary.Uvarint(buf[bi:]); n < 0 {
return 0, 0, 0, 0, errBadDeliveredUpdate
}
bi += n
if dc, n = binary.Uvarint(buf[bi:]); n < 0 {
return 0, 0, 0, 0, errBadDeliveredUpdate
}
bi += n
if ts, n = binary.Varint(buf[bi:]); n < 0 {
return 0, 0, 0, 0, errBadDeliveredUpdate
}
return dseq, sseq, dc, ts, nil
}
func (js *jetStream) processConsumerLeaderChange(o *consumer, isLeader bool) error {
stepDownIfLeader := func() error {
if node := o.raftNode(); node != nil && isLeader {
node.StepDown()
}
return errors.New("failed to update consumer leader status")
}
ca := o.consumerAssignment()
if ca == nil {
return stepDownIfLeader()
}
js.mu.Lock()
s, account, err := js.srv, ca.Client.serviceAccount(), ca.err
client, subject, reply := ca.Client, ca.Subject, ca.Reply
hasResponded := ca.responded
ca.responded = true
js.mu.Unlock()
streamName, consumerName := o.streamName(), o.String()
acc, _ := s.LookupAccount(account)
if acc == nil {
return stepDownIfLeader()
}
if isLeader {
s.Noticef("JetStream cluster new consumer leader for "%s > %s > %s"", ca.Client.serviceAccount(), streamName, consumerName)
s.sendConsumerLeaderElectAdvisory(o)
// Check for peer removal and process here if needed.
js.checkPeers(ca.Group)
} else {
// We are stepping down.
// Make sure if we are doing so because we have lost quorum that we send the appropriate advisories.
if node := o.raftNode(); node != nil && !node.Quorum() && time.Since(node.Created()) > 5*time.Second {
s.sendConsumerLostQuorumAdvisory(o)
}
}
// Tell consumer to switch leader status.
o.setLeader(isLeader)
if !isLeader || hasResponded {
if isLeader {
o.clearInitialInfo()
}
return nil
}
var resp = JSApiConsumerCreateResponse{ApiResponse: ApiResponse{Type: JSApiConsumerCreateResponseType}}
if err != nil {
resp.Error = NewJSConsumerCreateError(err, Unless(err))
s.sendAPIErrResponse(client, acc, subject, reply, _EMPTY_, s.jsonResponse(&resp))
} else {
resp.ConsumerInfo = o.initialInfo()
s.sendAPIResponse(client, acc, subject, reply, _EMPTY_, s.jsonResponse(&resp))
if node := o.raftNode(); node != nil {
o.sendCreateAdvisory()
}
}
return nil
}
// Determines if we should send lost quorum advisory. We throttle these after first one.
func (o *consumer) shouldSendLostQuorum() bool {
o.mu.Lock()
defer o.mu.Unlock()
if time.Since(o.lqsent) >= lostQuorumAdvInterval {
o.lqsent = time.Now()
return true
}
return false
}
func (s *Server) sendConsumerLostQuorumAdvisory(o *consumer) {
if o == nil {
return
}
node, stream, consumer, acc := o.raftNode(), o.streamName(), o.String(), o.account()
if node == nil {
return
}
if !o.shouldSendLostQuorum() {
return
}
s.Warnf("JetStream cluster consumer "%s > %s > %s" has NO quorum, stalled.", acc.GetName(), stream, consumer)
subj := JSAdvisoryConsumerQuorumLostPre + "." + stream + "." + consumer
adv := &JSConsumerQuorumLostAdvisory{
TypedEvent: TypedEvent{
Type: JSConsumerQuorumLostAdvisoryType,
ID: nuid.Next(),
Time: time.Now().UTC(),
},
Stream: stream,
Consumer: consumer,
Replicas: s.replicas(node),
Domain: s.getOpts().JetStreamDomain,
}
// Send to the user"s account if not the system account.
if acc != s.SystemAccount() {
s.publishAdvisory(acc, subj, adv)
}
// Now do system level one. Place account info in adv, and nil account means system.
adv.Account = acc.GetName()
s.publishAdvisory(nil, subj, adv)
}
func (s *Server) sendConsumerLeaderElectAdvisory(o *consumer) {
if o == nil {
return
}
node, stream, consumer, acc := o.raftNode(), o.streamName(), o.String(), o.account()
if node == nil {
return
}
subj := JSAdvisoryConsumerLeaderElectedPre + "." + stream + "." + consumer
adv := &JSConsumerLeaderElectedAdvisory{
TypedEvent: TypedEvent{
Type: JSConsumerLeaderElectedAdvisoryType,
ID: nuid.Next(),
Time: time.Now().UTC(),
},
Stream: stream,
Consumer: consumer,
Leader: s.serverNameForNode(node.GroupLeader()),
Replicas: s.replicas(node),
Domain: s.getOpts().JetStreamDomain,
}
// Send to the user"s account if not the system account.
if acc != s.SystemAccount() {
s.publishAdvisory(acc, subj, adv)
}
// Now do system level one. Place account info in adv, and nil account means system.
adv.Account = acc.GetName()
s.publishAdvisory(nil, subj, adv)
}
type streamAssignmentResult struct {
Account string `json:"account"`
Stream string `json:"stream"`
Response *JSApiStreamCreateResponse `json:"create_response,omitempty"`
Restore *JSApiStreamRestoreResponse `json:"restore_response,omitempty"`
Update bool `json:"is_update,omitempty"`
}
// Determine if this is an insufficient resources" error type.
func isInsufficientResourcesErr(resp *JSApiStreamCreateResponse) bool {
return resp != nil && resp.Error != nil && IsNatsErr(resp.Error, JSInsufficientResourcesErr, JSMemoryResourcesExceededErr, JSStorageResourcesExceededErr)
}
// Process error results of stream and consumer assignments.
// Success will be handled by stream leader.
func (js *jetStream) processStreamAssignmentResults(sub *subscription, c *client, _ *Account, subject, reply string, msg []byte) {
var result streamAssignmentResult
if err := json.Unmarshal(msg, &result); err != nil {
// TODO(dlc) - log
return
}
acc, _ := js.srv.LookupAccount(result.Account)
if acc == nil {
// TODO(dlc) - log
return
}
js.mu.Lock()
defer js.mu.Unlock()
s, cc := js.srv, js.cluster
// This should have been done already in processStreamAssignment, but in
// case we have a code path that gets here with no processStreamAssignment,
// then we will do the proper thing. Otherwise will be a no-op.
cc.removeInflightProposal(result.Account, result.Stream)
// FIXME(dlc) - suppress duplicates?
if sa := js.streamAssignment(result.Account, result.Stream); sa != nil {
canDelete := !result.Update && time.Since(sa.Created) < 5*time.Second
// See if we should retry in case this cluster is full but there are others.
if cfg, ci := sa.Config, sa.Client; cfg != nil && ci != nil && isInsufficientResourcesErr(result.Response) && canDelete {
// If cluster is defined we can not retry.
if cfg.Placement == nil || cfg.Placement.Cluster == _EMPTY_ {
// If we have additional clusters to try we can retry.
if ci != nil && len(ci.Alternates) > 0 {
if rg, err := js.createGroupForStream(ci, cfg); err != nil {
s.Warnf("Retrying cluster placement for stream "%s > %s" failed due to placement error: %+v", result.Account, result.Stream, err)
} else {
if org := sa.Group; org != nil && len(org.Peers) > 0 {
s.Warnf("Retrying cluster placement for stream "%s > %s" due to insufficient resources in cluster %q",
result.Account, result.Stream, s.clusterNameForNode(org.Peers[0]))
} else {
s.Warnf("Retrying cluster placement for stream "%s > %s" due to insufficient resources", result.Account, result.Stream)
}
// Pick a new preferred leader.
rg.setPreferred()
// Get rid of previous attempt.
cc.meta.Propose(encodeDeleteStreamAssignment(sa))
// Propose new.
sa.Group, sa.err = rg, nil
cc.meta.Propose(encodeAddStreamAssignment(sa))
return
}
}
}
}
// Respond to the user here.
var resp string
if result.Response != nil {
resp = s.jsonResponse(result.Response)
} else if result.Restore != nil {
resp = s.jsonResponse(result.Restore)
}
if !sa.responded || result.Update {
sa.responded = true
js.srv.sendAPIErrResponse(sa.Client, acc, sa.Subject, sa.Reply, _EMPTY_, resp)
}
// Remove this assignment if possible.
if canDelete {
sa.err = NewJSClusterNotAssignedError()
cc.meta.Propose(encodeDeleteStreamAssignment(sa))
}
}
}
func (js *jetStream) processConsumerAssignmentResults(sub *subscription, c *client, _ *Account, subject, reply string, msg []byte) {
var result consumerAssignmentResult
if err := json.Unmarshal(msg, &result); err != nil {
// TODO(dlc) - log
return
}
acc, _ := js.srv.LookupAccount(result.Account)
if acc == nil {
// TODO(dlc) - log
return
}
js.mu.Lock()
defer js.mu.Unlock()
s, cc := js.srv, js.cluster
if sa := js.streamAssignment(result.Account, result.Stream); sa != nil && sa.consumers != nil {
if ca := sa.consumers[result.Consumer]; ca != nil && !ca.responded {
js.srv.sendAPIErrResponse(ca.Client, acc, ca.Subject, ca.Reply, _EMPTY_, s.jsonResponse(result.Response))
ca.responded = true
// Check if this failed.
// TODO(dlc) - Could have mixed results, should track per peer.
// Make sure this is recent response, do not delete existing consumers.
if result.Response.Error != nil && result.Response.Error != NewJSConsumerNameExistError() && time.Since(ca.Created) < 2*time.Second {
// So while we are deleting we will not respond to list/names requests.
ca.err = NewJSClusterNotAssignedError()
cc.meta.Propose(encodeDeleteConsumerAssignment(ca))
s.Warnf("Proposing to delete consumer `%s > %s > %s" due to assignment response error: %v",
result.Account, result.Stream, result.Consumer, result.Response.Error)
}
}
}
}
const (
streamAssignmentSubj = "$SYS.JSC.STREAM.ASSIGNMENT.RESULT"
consumerAssignmentSubj = "$SYS.JSC.CONSUMER.ASSIGNMENT.RESULT"
)
// Lock should be held.
func (js *jetStream) startUpdatesSub() {
cc, s, c := js.cluster, js.srv, js.cluster.c
if cc.streamResults == nil {
cc.streamResults, _ = s.systemSubscribe(streamAssignmentSubj, _EMPTY_, false, c, js.processStreamAssignmentResults)
}
if cc.consumerResults == nil {
cc.consumerResults, _ = s.systemSubscribe(consumerAssignmentSubj, _EMPTY_, false, c, js.processConsumerAssignmentResults)
}
if cc.stepdown == nil {
cc.stepdown, _ = s.systemSubscribe(JSApiLeaderStepDown, _EMPTY_, false, c, s.jsLeaderStepDownRequest)
}
if cc.peerRemove == nil {
cc.peerRemove, _ = s.systemSubscribe(JSApiRemoveServer, _EMPTY_, false, c, s.jsLeaderServerRemoveRequest)
}
if cc.peerStreamMove == nil {
cc.peerStreamMove, _ = s.systemSubscribe(JSApiServerStreamMove, _EMPTY_, false, c, s.jsLeaderServerStreamMoveRequest)
}
if cc.peerStreamCancelMove == nil {
cc.peerStreamCancelMove, _ = s.systemSubscribe(JSApiServerStreamCancelMove, _EMPTY_, false, c, s.jsLeaderServerStreamCancelMoveRequest)
}
if js.accountPurge == nil {
js.accountPurge, _ = s.systemSubscribe(JSApiAccountPurge, _EMPTY_, false, c, s.jsLeaderAccountPurgeRequest)
}
}
// Lock should be held.
func (js *jetStream) stopUpdatesSub() {
cc := js.cluster
if cc.streamResults != nil {
cc.s.sysUnsubscribe(cc.streamResults)
cc.streamResults = nil
}
if cc.consumerResults != nil {
cc.s.sysUnsubscribe(cc.consumerResults)
cc.consumerResults = nil
}
if cc.stepdown != nil {
cc.s.sysUnsubscribe(cc.stepdown)
cc.stepdown = nil
}
if cc.peerRemove != nil {
cc.s.sysUnsubscribe(cc.peerRemove)
cc.peerRemove = nil
}
if cc.peerStreamMove != nil {
cc.s.sysUnsubscribe(cc.peerStreamMove)
cc.peerStreamMove = nil
}
if cc.peerStreamCancelMove != nil {
cc.s.sysUnsubscribe(cc.peerStreamCancelMove)
cc.peerStreamCancelMove = nil
}
if js.accountPurge != nil {
cc.s.sysUnsubscribe(js.accountPurge)
js.accountPurge = nil
}
}
func (js *jetStream) processLeaderChange(isLeader bool) {
if isLeader {
js.srv.Noticef("Self is new JetStream cluster metadata leader")
} else {
var node string
if meta := js.getMetaGroup(); meta != nil {
node = meta.GroupLeader()
}
if node == _EMPTY_ {
js.srv.Noticef("JetStream cluster no metadata leader")
} else if srv := js.srv.serverNameForNode(node); srv == _EMPTY_ {
js.srv.Noticef("JetStream cluster new remote metadata leader")
} else if clst := js.srv.clusterNameForNode(node); clst == _EMPTY_ {
js.srv.Noticef("JetStream cluster new metadata leader: %s", srv)
} else {
js.srv.Noticef("JetStream cluster new metadata leader: %s/%s", srv, clst)
}
}
js.mu.Lock()
defer js.mu.Unlock()
if isLeader {
js.startUpdatesSub()
} else {
js.stopUpdatesSub()
// TODO(dlc) - stepdown.
}
// If we have been signaled to check the streams, this is for a bug that left stream
// assignments with no sync subject after an update and no way to sync/catchup outside of the RAFT layer.
if isLeader && js.cluster.streamsCheck {
cc := js.cluster
for acc, asa := range cc.streams {
for _, sa := range asa {
if sa.Sync == _EMPTY_ {
js.srv.Warnf("Stream assigment corrupt for stream "%s > %s"", acc, sa.Config.Name)
nsa := &streamAssignment{Group: sa.Group, Config: sa.Config, Subject: sa.Subject, Reply: sa.Reply, Client: sa.Client}
nsa.Sync = syncSubjForStream()
cc.meta.Propose(encodeUpdateStreamAssignment(nsa))
}
}
}
// Clear check.
cc.streamsCheck = false
}
}
// Lock should be held.
func (cc *jetStreamCluster) remapStreamAssignment(sa *streamAssignment, removePeer string) bool {
// Invoke placement algo passing RG peers that stay (existing) and the peer that is being removed (ignore)
var retain, ignore []string
for _, v := range sa.Group.Peers {
if v == removePeer {
ignore = append(ignore, v)
} else {
retain = append(retain, v)
}
}
newPeers, placementError := cc.selectPeerGroup(len(sa.Group.Peers), sa.Group.Cluster, sa.Config, retain, 0, ignore)
if placementError == nil {
sa.Group.Peers = newPeers
// Don"t influence preferred leader.
sa.Group.Preferred = _EMPTY_
return true
}
// If we are here let"s remove the peer at least.
for i, peer := range sa.Group.Peers {
if peer == removePeer {
sa.Group.Peers[i] = sa.Group.Peers[len(sa.Group.Peers)-1]
sa.Group.Peers = sa.Group.Peers[:len(sa.Group.Peers)-1]
break
}
}
return false
}
type selectPeerError struct {
excludeTag bool
offline bool
noStorage bool
uniqueTag bool
misc bool
noJsClust bool
noMatchTags map[string]struct{}
}
func (e *selectPeerError) Error() string {
b := strings.Builder{}
writeBoolErrReason := func(hasErr bool, errMsg string) {
if !hasErr {
return
}
b.WriteString(", ")
b.WriteString(errMsg)
}
b.WriteString("no suitable peers for placement")
writeBoolErrReason(e.offline, "peer offline")
writeBoolErrReason(e.excludeTag, "exclude tag set")
writeBoolErrReason(e.noStorage, "insufficient storage")
writeBoolErrReason(e.uniqueTag, "server tag not unique")
writeBoolErrReason(e.misc, "miscellaneous issue")
writeBoolErrReason(e.noJsClust, "jetstream not enabled in cluster")
if len(e.noMatchTags) != 0 {
b.WriteString(", tags not matched [")
var firstTagWritten bool
for tag := range e.noMatchTags {
if firstTagWritten {
b.WriteString(", ")
}
firstTagWritten = true
b.WriteRune("\"")
b.WriteString(tag)
b.WriteRune("\"")
}
b.WriteString("]")
}
return b.String()
}
func (e *selectPeerError) addMissingTag(t string) {
if e.noMatchTags == nil {
e.noMatchTags = map[string]struct{}{}
}
e.noMatchTags[t] = struct{}{}
}
func (e *selectPeerError) accumulate(eAdd *selectPeerError) {
if eAdd == nil {
return
}
acc := func(val *bool, valAdd bool) {
if valAdd {
*val = valAdd
}
}
acc(&e.offline, eAdd.offline)
acc(&e.excludeTag, eAdd.excludeTag)
acc(&e.noStorage, eAdd.noStorage)
acc(&e.uniqueTag, eAdd.uniqueTag)
acc(&e.misc, eAdd.misc)
acc(&e.noJsClust, eAdd.noJsClust)
for tag := range eAdd.noMatchTags {
e.addMissingTag(tag)
}
}
// selectPeerGroup will select a group of peers to start a raft group.
// when peers exist already the unique tag prefix check for the replaceFirstExisting will be skipped
func (cc *jetStreamCluster) selectPeerGroup(r int, cluster string, cfg *StreamConfig, existing []string, replaceFirstExisting int, ignore []string) ([]string, *selectPeerError) {
if cluster == _EMPTY_ || cfg == nil {
return nil, &selectPeerError{misc: true}
}
var maxBytes uint64
if cfg.MaxBytes > 0 {
maxBytes = uint64(cfg.MaxBytes)
}
// Check for tags.
var tags []string
if cfg.Placement != nil && len(cfg.Placement.Tags) > 0 {
tags = cfg.Placement.Tags
}
// Used for weighted sorting based on availability.
type wn struct {
id string
avail uint64
ha int
}
var nodes []wn
// peers is a randomized list
s, peers := cc.s, cc.meta.Peers()
uniqueTagPrefix := s.getOpts().JetStreamUniqueTag
if uniqueTagPrefix != _EMPTY_ {
for _, tag := range tags {
if strings.HasPrefix(tag, uniqueTagPrefix) {
// disable uniqueness check if explicitly listed in tags
uniqueTagPrefix = _EMPTY_
break
}
}
}
var uniqueTags = make(map[string]*nodeInfo)
checkUniqueTag := func(ni *nodeInfo) (bool, *nodeInfo) {
for _, t := range ni.tags {
if strings.HasPrefix(t, uniqueTagPrefix) {
if n, ok := uniqueTags[t]; !ok {
uniqueTags[t] = ni
return true, ni
} else {
return false, n
}
}
}
// default requires the unique prefix to be present
return false, nil
}
// Map existing.
var ep map[string]struct{}
if le := len(existing); le > 0 {
if le >= r {
return existing[:r], nil
}
ep = make(map[string]struct{})
for i, p := range existing {
ep[p] = struct{}{}
if uniqueTagPrefix == _EMPTY_ {
continue
}
si, ok := s.nodeToInfo.Load(p)
if !ok || si == nil || i < replaceFirstExisting {
continue
}
ni := si.(nodeInfo)
// collect unique tags, but do not require them as this node is already part of the peerset
checkUniqueTag(&ni)
}
}
// Map ignore
var ip map[string]struct{}
if li := len(ignore); li > 0 {
ip = make(map[string]struct{})
for _, p := range ignore {
ip[p] = struct{}{}
}
}
maxHaAssets := s.getOpts().JetStreamLimits.MaxHAAssets
// An error is a result of multiple individual placement decisions.
// Which is why we keep taps on how often which one happened.
err := selectPeerError{}
// Shuffle them up.
rand.Shuffle(len(peers), func(i, j int) { peers[i], peers[j] = peers[j], peers[i] })
for _, p := range peers {
si, ok := s.nodeToInfo.Load(p.ID)
if !ok || si == nil {
err.misc = true
continue
}
ni := si.(nodeInfo)
// Only select from the designated named cluster.
if ni.cluster != cluster {
s.Debugf("Peer selection: discard %s@%s reason: not target cluster %s", ni.name, ni.cluster, cluster)
continue
}
// If we know its offline or we do not have config or err don"t consider.
if ni.offline || ni.cfg == nil || ni.stats == nil {
s.Debugf("Peer selection: discard %s@%s reason: offline", ni.name, ni.cluster)
err.offline = true
continue
}
// If ignore skip
if _, ok := ip[p.ID]; ok {
continue
}
// If existing also skip, we will add back in to front of the list when done.
if _, ok := ep[p.ID]; ok {
continue
}
if ni.tags.Contains(jsExcludePlacement) {
s.Debugf("Peer selection: discard %s@%s tags: %v reason: %s present",
ni.name, ni.cluster, ni.tags, jsExcludePlacement)
err.excludeTag = true
continue
}
if len(tags) > 0 {
matched := true
for _, t := range tags {
if !ni.tags.Contains(t) {
matched = false
s.Debugf("Peer selection: discard %s@%s tags: %v reason: mandatory tag %s not present",
ni.name, ni.cluster, ni.tags, t)
err.addMissingTag(t)
break
}
}
if !matched {
continue
}
}
var available uint64
var ha int
if ni.stats != nil {
switch cfg.Storage {
case MemoryStorage:
used := ni.stats.ReservedMemory
if ni.stats.Memory > used {
used = ni.stats.Memory
}
if ni.cfg.MaxMemory > int64(used) {
available = uint64(ni.cfg.MaxMemory) - used
}
case FileStorage:
used := ni.stats.ReservedStore
if ni.stats.Store > used {
used = ni.stats.Store
}
if ni.cfg.MaxStore > int64(used) {
available = uint64(ni.cfg.MaxStore) - used
}
}
ha = ni.stats.HAAssets
}
// Otherwise check if we have enough room if maxBytes set.
if maxBytes > 0 && maxBytes > available {
s.Warnf("Peer selection: discard %s@%s (Max Bytes: %d) exceeds available %s storage of %d bytes",
ni.name, ni.cluster, maxBytes, cfg.Storage.String(), available)
err.noStorage = true
continue
}
// HAAssets contain _meta_ which we want to ignore, hence > and not >=.
if maxHaAssets > 0 && ni.stats != nil && ni.stats.HAAssets > maxHaAssets {
s.Warnf("Peer selection: discard %s@%s (HA Asset Count: %d) exceeds max ha asset limit of %d for stream placement",
ni.name, ni.cluster, ni.stats.HAAssets, maxHaAssets)
err.misc = true
continue
}
if uniqueTagPrefix != _EMPTY_ {
if unique, owner := checkUniqueTag(&ni); !unique {
if owner != nil {
s.Debugf("Peer selection: discard %s@%s tags:%v reason: unique prefix %s owned by %s@%s",
ni.name, ni.cluster, ni.tags, owner.name, owner.cluster)
} else {
s.Debugf("Peer selection: discard %s@%s tags:%v reason: unique prefix %s not present",
ni.name, ni.cluster, ni.tags)
}
err.uniqueTag = true
continue
}
}
// Add to our list of potential nodes.
nodes = append(nodes, wn{p.ID, available, ha})
}
// If we could not select enough peers, fail.
if len(nodes) < (r - len(existing)) {
s.Debugf("Peer selection: required %d nodes but found %d (cluster: %s replica: %d existing: %v/%d peers: %d result-peers: %d err: %+v)",
(r - len(existing)), len(nodes), cluster, r, existing, replaceFirstExisting, len(peers), len(nodes), err)
if len(peers) == 0 {
err.noJsClust = true
}
return nil, &err
}
// Sort based on available from most to least.
sort.Slice(nodes, func(i, j int) bool { return nodes[i].avail > nodes[j].avail })
// If we are placing a replicated stream, let"s sort based in haAssets, as that is more important to balance.
if cfg.Replicas > 1 {
sort.SliceStable(nodes, func(i, j int) bool { return nodes[i].ha < nodes[j].ha })
}
var results []string
if len(existing) > 0 {
results = append(results, existing...)
r -= len(existing)
}
for _, r := range nodes[:r] {
results = append(results, r.id)
}
return results, nil
}
func groupNameForStream(peers []string, storage StorageType) string {
return groupName("S", peers, storage)
}
func groupNameForConsumer(peers []string, storage StorageType) string {
return groupName("C", peers, storage)
}
func groupName(prefix string, peers []string, storage StorageType) string {
gns := getHash(nuid.Next())
return fmt.Sprintf("%s-R%d%s-%s", prefix, len(peers), storage.String()[:1], gns)
}
// returns stream count for this tier as well as applicable reservation size (not including reservations for cfg)
// jetStream read lock should be held
func tieredStreamAndReservationCount(asa map[string]*streamAssignment, tier string, cfg *StreamConfig) (int, int64) {
numStreams := len(asa)
reservation := int64(0)
if tier == _EMPTY_ {
for _, sa := range asa {
if sa.Config.MaxBytes > 0 && sa.Config.Name != cfg.Name {
if sa.Config.Storage == cfg.Storage {
reservation += (int64(sa.Config.Replicas) * sa.Config.MaxBytes)
}
}
}
} else {
numStreams = 0
for _, sa := range asa {
if isSameTier(sa.Config, cfg) {
numStreams++
if sa.Config.MaxBytes > 0 {
if sa.Config.Storage == cfg.Storage && sa.Config.Name != cfg.Name {
reservation += (int64(sa.Config.Replicas) * sa.Config.MaxBytes)
}
}
}
}
}
return numStreams, reservation
}
// createGroupForStream will create a group for assignment for the stream.
// Lock should be held.
func (js *jetStream) createGroupForStream(ci *ClientInfo, cfg *StreamConfig) (*raftGroup, *selectPeerError) {
replicas := cfg.Replicas
if replicas == 0 {
replicas = 1
}
// Default connected cluster from the request origin.
cc, cluster := js.cluster, ci.Cluster
// If specified, override the default.
clusterDefined := cfg.Placement != nil && cfg.Placement.Cluster != _EMPTY_
if clusterDefined {
cluster = cfg.Placement.Cluster
}
clusters := []string{cluster}
if !clusterDefined {
clusters = append(clusters, ci.Alternates...)
}
// Need to create a group here.
errs := &selectPeerError{}
for _, cn := range clusters {
peers, err := cc.selectPeerGroup(replicas, cn, cfg, nil, 0, nil)
if len(peers) < replicas {
errs.accumulate(err)
continue
}
return &raftGroup{Name: groupNameForStream(peers, cfg.Storage), Storage: cfg.Storage, Peers: peers, Cluster: cn}, nil
}
return nil, errs
}
func (acc *Account) selectLimits(cfg *StreamConfig) (*JetStreamAccountLimits, string, *jsAccount, *ApiError) {
// Grab our jetstream account info.
acc.mu.RLock()
jsa := acc.js
acc.mu.RUnlock()
if jsa == nil {
return nil, _EMPTY_, nil, NewJSNotEnabledForAccountError()
}
jsa.usageMu.RLock()
selectedLimits, tierName, ok := jsa.selectLimits(cfg)
jsa.usageMu.RUnlock()
if !ok {
return nil, _EMPTY_, nil, NewJSNoLimitsError()
}
return &selectedLimits, tierName, jsa, nil
}
// Read lock needs to be held
func (js *jetStream) jsClusteredStreamLimitsCheck(acc *Account, cfg *StreamConfig) *ApiError {
selectedLimits, tier, _, apiErr := acc.selectLimits(cfg)
if apiErr != nil {
return apiErr
}
asa := js.cluster.streams[acc.Name]
numStreams, reservations := tieredStreamAndReservationCount(asa, tier, cfg)
// Check for inflight proposals...
if cc := js.cluster; cc != nil && cc.inflight != nil {
numStreams += len(cc.inflight[acc.Name])
}
if selectedLimits.MaxStreams > 0 && numStreams >= selectedLimits.MaxStreams {
return NewJSMaximumStreamsLimitError()
}
// Check for account limits here before proposing.
if err := js.checkAccountLimits(selectedLimits, cfg, reservations); err != nil {
return NewJSStreamLimitsError(err, Unless(err))
}
return nil
}
func (s *Server) jsClusteredStreamRequest(ci *ClientInfo, acc *Account, subject, reply string, rmsg []byte, config *StreamConfig) {
js, cc := s.getJetStreamCluster()
if js == nil || cc == nil {
return
}
var resp = JSApiStreamCreateResponse{ApiResponse: ApiResponse{Type: JSApiStreamCreateResponseType}}
ccfg, apiErr := s.checkStreamCfg(config, acc)
if apiErr != nil {
resp.Error = apiErr
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
cfg := &ccfg
// Now process the request and proposal.
js.mu.Lock()
defer js.mu.Unlock()
// Capture if we have existing assignment first.
osa := js.streamAssignment(acc.Name, cfg.Name)
var areEqual bool
if osa != nil {
areEqual = reflect.DeepEqual(osa.Config, cfg)
}
// If this stream already exists, turn this into a stream info call.
if osa != nil {
// If they are the same then we will forward on as a stream info request.
// This now matches single server behavior.
if areEqual {
// This works when we have a stream leader. If we have no leader let the dupe
// go through as normal. We will handle properly on the other end.
// We must check interest at the $SYS account layer, not user account since import
// will always show interest.
sisubj := fmt.Sprintf(clusterStreamInfoT, acc.Name, cfg.Name)
if s.SystemAccount().Interest(sisubj) > 0 {
isubj := fmt.Sprintf(JSApiStreamInfoT, cfg.Name)
// We want to make sure we send along the client info.
cij, _ := json.Marshal(ci)
hdr := map[string]string{
ClientInfoHdr: string(cij),
JSResponseType: jsCreateResponse,
}
// Send this as system account, but include client info header.
s.sendInternalAccountMsgWithReply(nil, isubj, reply, hdr, nil, true)
return
}
} else {
resp.Error = NewJSStreamNameExistError()
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
}
if cfg.Sealed {
resp.Error = NewJSStreamInvalidConfigError(fmt.Errorf("stream configuration for create can not be sealed"))
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
var self *streamAssignment
if osa != nil && areEqual {
self = osa
}
// Check for subject collisions here.
if cc.subjectsOverlap(acc.Name, cfg.Subjects, self) {
resp.Error = NewJSStreamSubjectOverlapError()
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
apiErr = js.jsClusteredStreamLimitsCheck(acc, cfg)
// Check for stream limits here before proposing. These need to be tracked from meta layer, not jsa.
if apiErr != nil {
resp.Error = apiErr
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
// Raft group selection and placement.
var rg *raftGroup
if osa != nil && areEqual {
rg = osa.Group
} else {
// Check inflight before proposing in case we have an existing inflight proposal.
if cc.inflight == nil {
cc.inflight = make(map[string]map[string]*raftGroup)
}
streams, ok := cc.inflight[acc.Name]
if !ok {
streams = make(map[string]*raftGroup)
cc.inflight[acc.Name] = streams
} else if existing, ok := streams[cfg.Name]; ok {
// We have existing for same stream. Re-use same group.
rg = existing
}
}
// Create a new one here.
if rg == nil {
nrg, err := js.createGroupForStream(ci, cfg)
if err != nil {
resp.Error = NewJSClusterNoPeersError(err)
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
rg = nrg
// Pick a preferred leader.
rg.setPreferred()
}
// Sync subject for post snapshot sync.
sa := &streamAssignment{Group: rg, Sync: syncSubjForStream(), Config: cfg, Subject: subject, Reply: reply, Client: ci, Created: time.Now().UTC()}
if err := cc.meta.Propose(encodeAddStreamAssignment(sa)); err == nil {
// On success, add this as an inflight proposal so we can apply limits
// on concurrent create requests while this stream assignment has
// possibly not been processed yet.
if streams, ok := cc.inflight[acc.Name]; ok {
streams[cfg.Name] = rg
}
}
}
var (
errReqTimeout = errors.New("timeout while waiting for response")
errReqSrvExit = errors.New("server shutdown while waiting for response")
)
// blocking utility call to perform requests on the system account
// returns (synchronized) v or error
func (s *Server) sysRequest(v interface{}, subjFormat string, args ...interface{}) (interface{}, error) {
isubj := fmt.Sprintf(subjFormat, args...)
s.mu.Lock()
inbox := s.newRespInbox()
results := make(chan interface{}, 1)
// Store our handler.
s.sys.replies[inbox] = func(sub *subscription, _ *client, _ *Account, subject, _ string, msg []byte) {
if err := json.Unmarshal(msg, v); err != nil {
s.Warnf("Error unmarshalling response for request "%s":%v", isubj, err)
return
}
select {
case results <- v:
default:
s.Warnf("Failed placing request response on internal channel")
}
}
s.mu.Unlock()
s.sendInternalMsgLocked(isubj, inbox, nil, nil)
const timeout = 2 * time.Second
notActive := time.NewTimer(timeout)
defer notActive.Stop()
var err error
var data interface{}
select {
case <-s.quitCh:
err = errReqSrvExit
case <-notActive.C:
err = errReqTimeout
case data = <-results:
}
// Clean up here.
s.mu.Lock()
if s.sys != nil && s.sys.replies != nil {
delete(s.sys.replies, inbox)
}
s.mu.Unlock()
return data, err
}
func (s *Server) jsClusteredStreamUpdateRequest(ci *ClientInfo, acc *Account, subject, reply string, rmsg []byte, cfg *StreamConfig, peerSet []string) {
js, cc := s.getJetStreamCluster()
if js == nil || cc == nil {
return
}
// Now process the request and proposal.
js.mu.Lock()
defer js.mu.Unlock()
var resp = JSApiStreamUpdateResponse{ApiResponse: ApiResponse{Type: JSApiStreamUpdateResponseType}}
osa := js.streamAssignment(acc.Name, cfg.Name)
if osa == nil {
resp.Error = NewJSStreamNotFoundError()
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
var newCfg *StreamConfig
if jsa := js.accounts[acc.Name]; jsa != nil {
js.mu.Unlock()
ncfg, err := jsa.configUpdateCheck(osa.Config, cfg, s)
js.mu.Lock()
if err != nil {
resp.Error = NewJSStreamUpdateError(err, Unless(err))
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
} else {
newCfg = ncfg
}
} else {
resp.Error = NewJSNotEnabledForAccountError()
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
// Check for mirror changes which are not allowed.
if !reflect.DeepEqual(newCfg.Mirror, osa.Config.Mirror) {
resp.Error = NewJSStreamMirrorNotUpdatableError()
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
// Check for subject collisions here.
if cc.subjectsOverlap(acc.Name, cfg.Subjects, osa) {
resp.Error = NewJSStreamSubjectOverlapError()
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
// Make copy so to not change original.
rg := osa.copyGroup().Group
// Check for a move request.
var isMoveRequest, isMoveCancel bool
if lPeerSet := len(peerSet); lPeerSet > 0 {
isMoveRequest = true
// check if this is a cancellation
if lPeerSet == osa.Config.Replicas && lPeerSet <= len(rg.Peers) {
isMoveCancel = true
// can only be a cancellation if the peer sets overlap as expected
for i := 0; i < lPeerSet; i++ {
if peerSet[i] != rg.Peers[i] {
isMoveCancel = false
break
}
}
}
} else {
isMoveRequest = newCfg.Placement != nil && !reflect.DeepEqual(osa.Config.Placement, newCfg.Placement)
}
// Check for replica changes.
isReplicaChange := newCfg.Replicas != osa.Config.Replicas
// We stage consumer updates and do them after the stream update.
var consumers []*consumerAssignment
// Check if this is a move request, but no cancellation, and we are already moving this stream.
if isMoveRequest && !isMoveCancel && osa.Config.Replicas != len(rg.Peers) {
// obtain stats to include in error message
msg := _EMPTY_
if s.allPeersOffline(rg) {
msg = fmt.Sprintf("all %d peers offline", len(rg.Peers))
} else {
// Need to release js lock.
js.mu.Unlock()
if si, err := s.sysRequest(&StreamInfo{}, clusterStreamInfoT, ci.serviceAccount(), cfg.Name); err != nil {
msg = fmt.Sprintf("error retrieving info: %s", err.Error())
} else if si := si.(*StreamInfo); si != nil {
currentCount := 0
if si.Cluster.Leader != _EMPTY_ {
currentCount++
}
combinedLag := uint64(0)
for _, r := range si.Cluster.Replicas {
if r.Current {
currentCount++
}
combinedLag += r.Lag
}
msg = fmt.Sprintf("total peers: %d, current peers: %d, combined lag: %d",
len(rg.Peers), currentCount, combinedLag)
}
// Re-acquire here.
js.mu.Lock()
}
resp.Error = NewJSStreamMoveInProgressError(msg)
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
// Can not move and scale at same time.
if isMoveRequest && isReplicaChange {
resp.Error = NewJSStreamMoveAndScaleError()
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
if isReplicaChange {
// We are adding new peers here.
if newCfg.Replicas > len(rg.Peers) {
peers, err := cc.selectPeerGroup(newCfg.Replicas, rg.Cluster, newCfg, rg.Peers, 0, nil)
if err != nil {
resp.Error = NewJSClusterNoPeersError(err)
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
// Single nodes are not recorded by the NRG layer so we can rename.
if len(peers) == 1 {
rg.Name = groupNameForStream(peers, rg.Storage)
} else if len(rg.Peers) == 1 {
// This is scale up from being a singelton, set preferred to that singelton.
rg.Preferred = rg.Peers[0]
}
rg.Peers = peers
} else {
// We are deleting nodes here. We want to do our best to preserve the current leader.
// We have support now from above that guarantees we are in our own Go routine, so can
// ask for stream info from the stream leader to make sure we keep the leader in the new list.
var curLeader string
if !s.allPeersOffline(rg) {
// Need to release js lock.
js.mu.Unlock()
if si, err := s.sysRequest(&StreamInfo{}, clusterStreamInfoT, ci.serviceAccount(), cfg.Name); err != nil {
s.Warnf("Did not receive stream info results for "%s > %s" due to: %s", acc, cfg.Name, err)
} else if cl := si.(*StreamInfo).Cluster; cl != nil && cl.Leader != _EMPTY_ {
curLeader = getHash(cl.Leader)
}
// Re-acquire here.
js.mu.Lock()
}
// If we identified a leader make sure its part of the new group.
selected := make([]string, 0, newCfg.Replicas)
if curLeader != _EMPTY_ {
selected = append(selected, curLeader)
}
for _, peer := range rg.Peers {
if len(selected) == newCfg.Replicas {
break
}
if peer == curLeader {
continue
}
if si, ok := s.nodeToInfo.Load(peer); ok && si != nil {
if si.(nodeInfo).offline {
continue
}
selected = append(selected, peer)
}
}
rg.Peers = selected
}
// Need to remap any consumers.
for _, ca := range osa.consumers {
// Ephemerals are R=1, so only auto-remap durables, or R>1, unless stream is interest or workqueue policy.
numPeers := len(ca.Group.Peers)
if ca.Config.Durable != _EMPTY_ || numPeers > 1 || cfg.Retention != LimitsPolicy {
cca := ca.copyGroup()
// Adjust preferred as needed.
if numPeers == 1 && len(rg.Peers) > 1 {
cca.Group.Preferred = ca.Group.Peers[0]
} else {
cca.Group.Preferred = _EMPTY_
}
// Assign new peers.
cca.Group.Peers = rg.Peers
// We can not propose here before the stream itself so we collect them.
consumers = append(consumers, cca)
}
}
} else if isMoveRequest {
if len(peerSet) == 0 {
nrg, err := js.createGroupForStream(ci, newCfg)
if err != nil {
resp.Error = NewJSClusterNoPeersError(err)
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
// filter peers present in both sets
for _, peer := range rg.Peers {
found := false
for _, newPeer := range nrg.Peers {
if peer == newPeer {
found = true
break
}
}
if !found {
peerSet = append(peerSet, peer)
}
}
peerSet = append(peerSet, nrg.Peers...)
}
if len(rg.Peers) == 1 {
rg.Preferred = peerSet[0]
}
rg.Peers = peerSet
for _, ca := range osa.consumers {
cca := ca.copyGroup()
r := cca.Config.replicas(osa.Config)
// shuffle part of cluster peer set we will be keeping
randPeerSet := copyStrings(peerSet[len(peerSet)-newCfg.Replicas:])
rand.Shuffle(newCfg.Replicas, func(i, j int) { randPeerSet[i], randPeerSet[j] = randPeerSet[j], randPeerSet[i] })
// move overlapping peers at the end of randPeerSet and keep a tally of non overlapping peers
dropPeerSet := make([]string, 0, len(cca.Group.Peers))
for _, p := range cca.Group.Peers {
found := false
for i, rp := range randPeerSet {
if p == rp {
randPeerSet[i] = randPeerSet[newCfg.Replicas-1]
randPeerSet[newCfg.Replicas-1] = p
found = true
break
}
}
if !found {
dropPeerSet = append(dropPeerSet, p)
}
}
cPeerSet := randPeerSet[newCfg.Replicas-r:]
// In case of a set or cancel simply assign
if len(peerSet) == newCfg.Replicas {
cca.Group.Peers = cPeerSet
} else {
cca.Group.Peers = append(dropPeerSet, cPeerSet...)
}
// make sure it overlaps with peers and remove if not
if cca.Group.Preferred != _EMPTY_ {
found := false
for _, p := range cca.Group.Peers {
if p == cca.Group.Preferred {
found = true
break
}
}
if !found {
cca.Group.Preferred = _EMPTY_
}
}
// We can not propose here before the stream itself so we collect them.
consumers = append(consumers, cca)
}
} else {
// All other updates make sure no preferred is set.
rg.Preferred = _EMPTY_
}
sa := &streamAssignment{Group: rg, Sync: osa.Sync, Created: osa.Created, Config: newCfg, Subject: subject, Reply: reply, Client: ci}
cc.meta.Propose(encodeUpdateStreamAssignment(sa))
// Process any staged consumers.
for _, ca := range consumers {
cc.meta.Propose(encodeAddConsumerAssignment(ca))
}
}
func (s *Server) jsClusteredStreamDeleteRequest(ci *ClientInfo, acc *Account, stream, subject, reply string, rmsg []byte) {
js, cc := s.getJetStreamCluster()
if js == nil || cc == nil {
return
}
js.mu.Lock()
defer js.mu.Unlock()
osa := js.streamAssignment(acc.Name, stream)
if osa == nil {
var resp = JSApiStreamDeleteResponse{ApiResponse: ApiResponse{Type: JSApiStreamDeleteResponseType}}
resp.Error = NewJSStreamNotFoundError()
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
sa := &streamAssignment{Group: osa.Group, Config: osa.Config, Subject: subject, Reply: reply, Client: ci}
cc.meta.Propose(encodeDeleteStreamAssignment(sa))
}
// Process a clustered purge request.
func (s *Server) jsClusteredStreamPurgeRequest(
ci *ClientInfo,
acc *Account,
mset *stream,
stream, subject, reply string,
rmsg []byte,
preq *JSApiStreamPurgeRequest,
) {
js, cc := s.getJetStreamCluster()
if js == nil || cc == nil {
return
}
js.mu.Lock()
sa := js.streamAssignment(acc.Name, stream)
if sa == nil {
resp := JSApiStreamPurgeResponse{ApiResponse: ApiResponse{Type: JSApiStreamPurgeResponseType}}
resp.Error = NewJSStreamNotFoundError()
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
js.mu.Unlock()
return
}
if n := sa.Group.node; n != nil {
sp := &streamPurge{Stream: stream, LastSeq: mset.state().LastSeq, Subject: subject, Reply: reply, Client: ci, Request: preq}
n.Propose(encodeStreamPurge(sp))
js.mu.Unlock()
return
}
js.mu.Unlock()
if mset == nil {
return
}
var resp = JSApiStreamPurgeResponse{ApiResponse: ApiResponse{Type: JSApiStreamPurgeResponseType}}
purged, err := mset.purge(preq)
if err != nil {
resp.Error = NewJSStreamGeneralError(err, Unless(err))
} else {
resp.Purged = purged
resp.Success = true
}
s.sendAPIResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(resp))
}
func (s *Server) jsClusteredStreamRestoreRequest(
ci *ClientInfo,
acc *Account,
req *JSApiStreamRestoreRequest,
stream, subject, reply string, rmsg []byte) {
js, cc := s.getJetStreamCluster()
if js == nil || cc == nil {
return
}
js.mu.Lock()
defer js.mu.Unlock()
cfg := &req.Config
resp := JSApiStreamRestoreResponse{ApiResponse: ApiResponse{Type: JSApiStreamRestoreResponseType}}
if err := js.jsClusteredStreamLimitsCheck(acc, cfg); err != nil {
resp.Error = err
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
if sa := js.streamAssignment(ci.serviceAccount(), cfg.Name); sa != nil {
resp.Error = NewJSStreamNameExistRestoreFailedError()
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
// Raft group selection and placement.
rg, err := js.createGroupForStream(ci, cfg)
if err != nil {
resp.Error = NewJSClusterNoPeersError(err)
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
// Pick a preferred leader.
rg.setPreferred()
sa := &streamAssignment{Group: rg, Sync: syncSubjForStream(), Config: cfg, Subject: subject, Reply: reply, Client: ci, Created: time.Now().UTC()}
// Now add in our restore state and pre-select a peer to handle the actual receipt of the snapshot.
sa.Restore = &req.State
cc.meta.Propose(encodeAddStreamAssignment(sa))
}
// Determine if all peers for this group are offline.
func (s *Server) allPeersOffline(rg *raftGroup) bool {
if rg == nil {
return false
}
// Check to see if this stream has any servers online to respond.
for _, peer := range rg.Peers {
if si, ok := s.nodeToInfo.Load(peer); ok && si != nil {
if !si.(nodeInfo).offline {
return false
}
}
}
return true
}
// This will do a scatter and gather operation for all streams for this account. This is only called from metadata leader.
// This will be running in a separate Go routine.
func (s *Server) jsClusteredStreamListRequest(acc *Account, ci *ClientInfo, filter string, offset int, subject, reply string, rmsg []byte) {
defer s.grWG.Done()
js, cc := s.getJetStreamCluster()
if js == nil || cc == nil {
return
}
js.mu.RLock()
var streams []*streamAssignment
for _, sa := range cc.streams[acc.Name] {
if IsNatsErr(sa.err, JSClusterNotAssignedErr) {
continue
}
if filter != _EMPTY_ {
// These could not have subjects auto-filled in since they are raw and unprocessed.
if len(sa.Config.Subjects) == 0 {
if SubjectsCollide(filter, sa.Config.Name) {
streams = append(streams, sa)
}
} else {
for _, subj := range sa.Config.Subjects {
if SubjectsCollide(filter, subj) {
streams = append(streams, sa)
break
}
}
}
} else {
streams = append(streams, sa)
}
}
// Needs to be sorted for offsets etc.
if len(streams) > 1 {
sort.Slice(streams, func(i, j int) bool {
return strings.Compare(streams[i].Config.Name, streams[j].Config.Name) < 0
})
}
scnt := len(streams)
if offset > scnt {
offset = scnt
}
if offset > 0 {
streams = streams[offset:]
}
if len(streams) > JSApiListLimit {
streams = streams[:JSApiListLimit]
}
var resp = JSApiStreamListResponse{
ApiResponse: ApiResponse{Type: JSApiStreamListResponseType},
Streams: make([]*StreamInfo, 0, len(streams)),
}
js.mu.RUnlock()
if len(streams) == 0 {
resp.Limit = JSApiListLimit
resp.Offset = offset
s.sendAPIResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(resp))
return
}
// Create an inbox for our responses and send out our requests.
s.mu.Lock()
inbox := s.newRespInbox()
rc := make(chan *StreamInfo, len(streams))
// Store our handler.
s.sys.replies[inbox] = func(sub *subscription, _ *client, _ *Account, subject, _ string, msg []byte) {
var si StreamInfo
if err := json.Unmarshal(msg, &si); err != nil {
s.Warnf("Error unmarshaling clustered stream info response:%v", err)
return
}
select {
case rc <- &si:
default:
s.Warnf("Failed placing remote stream info result on internal channel")
}
}
s.mu.Unlock()
// Cleanup after.
defer func() {
s.mu.Lock()
if s.sys != nil && s.sys.replies != nil {
delete(s.sys.replies, inbox)
}
s.mu.Unlock()
}()
var missingNames []string
sent := map[string]int{}
// Send out our requests here.
js.mu.RLock()
for _, sa := range streams {
if s.allPeersOffline(sa.Group) {
// Place offline onto our results by hand here.
si := &StreamInfo{Config: *sa.Config, Created: sa.Created, Cluster: js.offlineClusterInfo(sa.Group)}
resp.Streams = append(resp.Streams, si)
missingNames = append(missingNames, sa.Config.Name)
} else {
isubj := fmt.Sprintf(clusterStreamInfoT, sa.Client.serviceAccount(), sa.Config.Name)
s.sendInternalMsgLocked(isubj, inbox, nil, nil)
sent[sa.Config.Name] = len(sa.consumers)
}
}
// Don"t hold lock.
js.mu.RUnlock()
const timeout = 4 * time.Second
notActive := time.NewTimer(timeout)
defer notActive.Stop()
LOOP:
for len(sent) > 0 {
select {
case <-s.quitCh:
return
case <-notActive.C:
s.Warnf("Did not receive all stream info results for %q", acc)
for sName := range sent {
missingNames = append(missingNames, sName)
}
break LOOP
case si := <-rc:
consCount := sent[si.Config.Name]
if consCount > 0 {
si.State.Consumers = consCount
}
delete(sent, si.Config.Name)
resp.Streams = append(resp.Streams, si)
// Check to see if we are done.
if len(resp.Streams) == len(streams) {
break LOOP
}
}
}
// Needs to be sorted as well.
if len(resp.Streams) > 1 {
sort.Slice(resp.Streams, func(i, j int) bool {
return strings.Compare(resp.Streams[i].Config.Name, resp.Streams[j].Config.Name) < 0
})
}
resp.Total = scnt
resp.Limit = JSApiListLimit
resp.Offset = offset
resp.Missing = missingNames
s.sendAPIResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(resp))
}
// This will do a scatter and gather operation for all consumers for this stream and account.
// This will be running in a separate Go routine.
func (s *Server) jsClusteredConsumerListRequest(acc *Account, ci *ClientInfo, offset int, stream, subject, reply string, rmsg []byte) {
defer s.grWG.Done()
js, cc := s.getJetStreamCluster()
if js == nil || cc == nil {
return
}
js.mu.RLock()
var consumers []*consumerAssignment
if sas := cc.streams[acc.Name]; sas != nil {
if sa := sas[stream]; sa != nil {
// Copy over since we need to sort etc.
for _, ca := range sa.consumers {
consumers = append(consumers, ca)
}
}
}
// Needs to be sorted.
if len(consumers) > 1 {
sort.Slice(consumers, func(i, j int) bool {
return strings.Compare(consumers[i].Name, consumers[j].Name) < 0
})
}
ocnt := len(consumers)
if offset > ocnt {
offset = ocnt
}
if offset > 0 {
consumers = consumers[offset:]
}
if len(consumers) > JSApiListLimit {
consumers = consumers[:JSApiListLimit]
}
// Send out our requests here.
var resp = JSApiConsumerListResponse{
ApiResponse: ApiResponse{Type: JSApiConsumerListResponseType},
Consumers: []*ConsumerInfo{},
}
js.mu.RUnlock()
if len(consumers) == 0 {
resp.Limit = JSApiListLimit
resp.Offset = offset
s.sendAPIResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(resp))
return
}
// Create an inbox for our responses and send out requests.
s.mu.Lock()
inbox := s.newRespInbox()
rc := make(chan *ConsumerInfo, len(consumers))
// Store our handler.
s.sys.replies[inbox] = func(sub *subscription, _ *client, _ *Account, subject, _ string, msg []byte) {
var ci ConsumerInfo
if err := json.Unmarshal(msg, &ci); err != nil {
s.Warnf("Error unmarshaling clustered consumer info response:%v", err)
return
}
select {
case rc <- &ci:
default:
s.Warnf("Failed placing consumer info result on internal chan")
}
}
s.mu.Unlock()
// Cleanup after.
defer func() {
s.mu.Lock()
if s.sys != nil && s.sys.replies != nil {
delete(s.sys.replies, inbox)
}
s.mu.Unlock()
}()
var missingNames []string
sent := map[string]struct{}{}
// Send out our requests here.
js.mu.RLock()
for _, ca := range consumers {
if s.allPeersOffline(ca.Group) {
// Place offline onto our results by hand here.
ci := &ConsumerInfo{Config: ca.Config, Created: ca.Created, Cluster: js.offlineClusterInfo(ca.Group)}
resp.Consumers = append(resp.Consumers, ci)
missingNames = append(missingNames, ca.Name)
} else {
isubj := fmt.Sprintf(clusterConsumerInfoT, ca.Client.serviceAccount(), stream, ca.Name)
s.sendInternalMsgLocked(isubj, inbox, nil, nil)
sent[ca.Name] = struct{}{}
}
}
// Don"t hold lock.
js.mu.RUnlock()
const timeout = 4 * time.Second
notActive := time.NewTimer(timeout)
defer notActive.Stop()
LOOP:
for len(sent) > 0 {
select {
case <-s.quitCh:
return
case <-notActive.C:
s.Warnf("Did not receive all consumer info results for "%s > %s"", acc, stream)
for cName := range sent {
missingNames = append(missingNames, cName)
}
break LOOP
case ci := <-rc:
delete(sent, ci.Name)
resp.Consumers = append(resp.Consumers, ci)
// Check to see if we are done.
if len(resp.Consumers) == len(consumers) {
break LOOP
}
}
}
// Needs to be sorted as well.
if len(resp.Consumers) > 1 {
sort.Slice(resp.Consumers, func(i, j int) bool {
return strings.Compare(resp.Consumers[i].Name, resp.Consumers[j].Name) < 0
})
}
resp.Total = len(resp.Consumers)
resp.Limit = JSApiListLimit
resp.Offset = offset
resp.Missing = missingNames
s.sendAPIResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(resp))
}
func encodeStreamPurge(sp *streamPurge) []byte {
var bb bytes.Buffer
bb.WriteByte(byte(purgeStreamOp))
json.NewEncoder(&bb).Encode(sp)
return bb.Bytes()
}
func decodeStreamPurge(buf []byte) (*streamPurge, error) {
var sp streamPurge
err := json.Unmarshal(buf, &sp)
return &sp, err
}
func (s *Server) jsClusteredConsumerDeleteRequest(ci *ClientInfo, acc *Account, stream, consumer, subject, reply string, rmsg []byte) {
js, cc := s.getJetStreamCluster()
if js == nil || cc == nil {
return
}
js.mu.Lock()
defer js.mu.Unlock()
var resp = JSApiConsumerDeleteResponse{ApiResponse: ApiResponse{Type: JSApiConsumerDeleteResponseType}}
sa := js.streamAssignment(acc.Name, stream)
if sa == nil {
resp.Error = NewJSStreamNotFoundError()
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
if sa.consumers == nil {
resp.Error = NewJSConsumerNotFoundError()
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
oca := sa.consumers[consumer]
if oca == nil {
resp.Error = NewJSConsumerNotFoundError()
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
oca.deleted = true
ca := &consumerAssignment{Group: oca.Group, Stream: stream, Name: consumer, Config: oca.Config, Subject: subject, Reply: reply, Client: ci}
cc.meta.Propose(encodeDeleteConsumerAssignment(ca))
}
func encodeMsgDelete(md *streamMsgDelete) []byte {
var bb bytes.Buffer
bb.WriteByte(byte(deleteMsgOp))
json.NewEncoder(&bb).Encode(md)
return bb.Bytes()
}
func decodeMsgDelete(buf []byte) (*streamMsgDelete, error) {
var md streamMsgDelete
err := json.Unmarshal(buf, &md)
return &md, err
}
func (s *Server) jsClusteredMsgDeleteRequest(ci *ClientInfo, acc *Account, mset *stream, stream, subject, reply string, req *JSApiMsgDeleteRequest, rmsg []byte) {
js, cc := s.getJetStreamCluster()
if js == nil || cc == nil {
return
}
js.mu.Lock()
sa := js.streamAssignment(acc.Name, stream)
if sa == nil {
s.Debugf("Message delete failed, could not locate stream "%s > %s"", acc.Name, stream)
js.mu.Unlock()
return
}
// Check for single replica items.
if n := sa.Group.node; n != nil {
md := streamMsgDelete{Seq: req.Seq, NoErase: req.NoErase, Stream: stream, Subject: subject, Reply: reply, Client: ci}
n.Propose(encodeMsgDelete(&md))
js.mu.Unlock()
return
}
js.mu.Unlock()
if mset == nil {
return
}
var err error
var removed bool
if req.NoErase {
removed, err = mset.removeMsg(req.Seq)
} else {
removed, err = mset.eraseMsg(req.Seq)
}
var resp = JSApiMsgDeleteResponse{ApiResponse: ApiResponse{Type: JSApiMsgDeleteResponseType}}
if err != nil {
resp.Error = NewJSStreamMsgDeleteFailedError(err, Unless(err))
} else if !removed {
resp.Error = NewJSSequenceNotFoundError(req.Seq)
} else {
resp.Success = true
}
s.sendAPIResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(resp))
}
func encodeAddStreamAssignment(sa *streamAssignment) []byte {
var bb bytes.Buffer
bb.WriteByte(byte(assignStreamOp))
json.NewEncoder(&bb).Encode(sa)
return bb.Bytes()
}
func encodeUpdateStreamAssignment(sa *streamAssignment) []byte {
var bb bytes.Buffer
bb.WriteByte(byte(updateStreamOp))
json.NewEncoder(&bb).Encode(sa)
return bb.Bytes()
}
func encodeDeleteStreamAssignment(sa *streamAssignment) []byte {
var bb bytes.Buffer
bb.WriteByte(byte(removeStreamOp))
json.NewEncoder(&bb).Encode(sa)
return bb.Bytes()
}
func decodeStreamAssignment(buf []byte) (*streamAssignment, error) {
var sa streamAssignment
err := json.Unmarshal(buf, &sa)
if err != nil {
return nil, err
}
fixCfgMirrorWithDedupWindow(sa.Config)
return &sa, err
}
// createGroupForConsumer will create a new group from same peer set as the stream.
func (cc *jetStreamCluster) createGroupForConsumer(cfg *ConsumerConfig, sa *streamAssignment) *raftGroup {
if len(sa.Group.Peers) == 0 || cfg.Replicas > len(sa.Group.Peers) {
return nil
}
peers := copyStrings(sa.Group.Peers)
var _ss [5]string
active := _ss[:0]
// Calculate all active peers.
for _, peer := range peers {
if sir, ok := cc.s.nodeToInfo.Load(peer); ok && sir != nil {
if !sir.(nodeInfo).offline {
active = append(active, peer)
}
}
}
if quorum := cfg.Replicas/2 + 1; quorum > len(active) {
// Not enough active to satisfy the request.
return nil
}
// If we want less then our parent stream, select from active.
if cfg.Replicas > 0 && cfg.Replicas < len(peers) {
// Pedantic in case stream is say R5 and consumer is R3 and 3 or more offline, etc.
if len(active) < cfg.Replicas {
return nil
}
// First shuffle the active peers and then select to account for replica = 1.
rand.Shuffle(len(active), func(i, j int) { active[i], active[j] = active[j], active[i] })
peers = active[:cfg.Replicas]
}
storage := sa.Config.Storage
if cfg.MemoryStorage {
storage = MemoryStorage
}
return &raftGroup{Name: groupNameForConsumer(peers, storage), Storage: storage, Peers: peers}
}
// jsClusteredConsumerRequest is first point of entry to create a consumer with R > 1.
func (s *Server) jsClusteredConsumerRequest(ci *ClientInfo, acc *Account, subject, reply string, rmsg []byte, stream string, cfg *ConsumerConfig) {
js, cc := s.getJetStreamCluster()
if js == nil || cc == nil {
return
}
var resp = JSApiConsumerCreateResponse{ApiResponse: ApiResponse{Type: JSApiConsumerCreateResponseType}}
streamCfg, ok := js.clusterStreamConfig(acc.Name, stream)
if !ok {
resp.Error = NewJSStreamNotFoundError()
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
selectedLimits, _, _, apiErr := acc.selectLimits(&streamCfg)
if apiErr != nil {
resp.Error = apiErr
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
srvLim := &s.getOpts().JetStreamLimits
// Make sure we have sane defaults
setConsumerConfigDefaults(cfg, srvLim, selectedLimits)
if err := checkConsumerCfg(cfg, srvLim, &streamCfg, acc, selectedLimits, false); err != nil {
resp.Error = err
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
js.mu.Lock()
defer js.mu.Unlock()
// Lookup the stream assignment.
sa := js.streamAssignment(acc.Name, stream)
if sa == nil {
resp.Error = NewJSStreamNotFoundError()
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
// Check for max consumers here to short circuit if possible.
// Start with limit on a stream, but if one is defined at the level of the account
// and is lower, use that limit.
maxc := sa.Config.MaxConsumers
if maxc <= 0 || (selectedLimits.MaxConsumers > 0 && selectedLimits.MaxConsumers < maxc) {
maxc = selectedLimits.MaxConsumers
}
if maxc > 0 {
// Don"t count DIRECTS.
total := 0
for _, ca := range sa.consumers {
if ca.Config != nil && !ca.Config.Direct {
total++
}
}
if total >= maxc {
resp.Error = NewJSMaximumConsumersLimitError()
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
}
// Also short circuit if DeliverLastPerSubject is set with no FilterSubject.
if cfg.DeliverPolicy == DeliverLastPerSubject {
if cfg.FilterSubject == _EMPTY_ {
resp.Error = NewJSConsumerInvalidPolicyError(fmt.Errorf("consumer delivery policy is deliver last per subject, but FilterSubject is not set"))
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
}
// Setup proper default for ack wait if we are in explicit ack mode.
if cfg.AckWait == 0 && (cfg.AckPolicy == AckExplicit || cfg.AckPolicy == AckAll) {
cfg.AckWait = JsAckWaitDefault
}
// Setup default of -1, meaning no limit for MaxDeliver.
if cfg.MaxDeliver == 0 {
cfg.MaxDeliver = -1
}
// Set proper default for max ack pending if we are ack explicit and none has been set.
if cfg.AckPolicy == AckExplicit && cfg.MaxAckPending == 0 {
cfg.MaxAckPending = JsDefaultMaxAckPending
}
var ca *consumerAssignment
var oname string
// See if we have an existing one already under same durable name or
// if name was set by the user.
if isDurableConsumer(cfg) || cfg.Name != _EMPTY_ {
if cfg.Name != _EMPTY_ {
oname = cfg.Name
} else {
oname = cfg.Durable
}
if ca = sa.consumers[oname]; ca != nil && !ca.deleted {
// Do quick sanity check on new cfg to prevent here if possible.
if err := acc.checkNewConsumerConfig(ca.Config, cfg); err != nil {
resp.Error = NewJSConsumerCreateError(err, Unless(err))
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
}
}
// If this is new consumer.
if ca == nil {
rg := cc.createGroupForConsumer(cfg, sa)
if rg == nil {
resp.Error = NewJSInsufficientResourcesError()
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
return
}
// Pick a preferred leader.
rg.setPreferred()
// Inherit cluster from stream.
rg.Cluster = sa.Group.Cluster
// We need to set the ephemeral here before replicating.
if !isDurableConsumer(cfg) {
// We chose to have ephemerals be R=1 unless stream is interest or workqueue.
// Consumer can override.
if sa.Config.Retention == LimitsPolicy && cfg.Replicas <= 1 {
rg.Peers = []string{rg.Preferred}
rg.Name = groupNameForConsumer(rg.Peers, rg.Storage)
}
if cfg.Name != _EMPTY_ {
oname = cfg.Name
} else {
// Make sure name is unique.
for {
oname = createConsumerName()
if sa.consumers != nil {
if sa.consumers[oname] != nil {
continue
}
}
break
}
}
}
if len(rg.Peers) > 1 {
if maxHaAssets := s.getOpts().JetStreamLimits.MaxHAAssets; maxHaAssets != 0 {
for _, peer := range rg.Peers {
if ni, ok := s.nodeToInfo.Load(peer); ok {
ni := ni.(nodeInfo)
if stats := ni.stats; stats != nil && stats.HAAssets > maxHaAssets {
resp.Error = NewJSInsufficientResourcesError()
s.sendAPIErrResponse(ci, acc, subject, reply, string(rmsg), s.jsonResponse(&resp))
s.Warnf("%s@%s (HA Asset Count: %d) exceeds max ha asset limit of %d"+
" for (durable) consumer %s placement on stream %s",
ni.name, ni.cluster, ni.stats.HAAssets, maxHaAssets, oname, stream)
return
}
}
}
}
}
ca = &consumerAssignment{
Group: rg,
Stream: stream,
Name: oname,
Config: cfg,
Subject: subject,
Reply: reply,
Client: ci,
Created: time.Now().UTC(),
}
} else {
nca := ca.copyGroup()
rBefore := ca.Config.replicas(sa.Config)
rAfter := cfg.replicas(sa.Config)
var curLeader string
if rBefore != rAfter {
// We are modifying nodes here. We want to do our best to preserve the current leader.
// We have support now from above that guarantees we are in our own Go routine, so can
// ask for stream info from the stream leader to make sure we keep the leader in the new list.
if !s.allPeersOffline(ca.Group) {
// Need to release js lock.
js.mu.Unlock()
if ci, err := s.sysRequest(&ConsumerInfo{}, clusterConsumerInfoT, ci.serviceAccount(), sa.Config.Name, cfg.Durable); err != nil {
s.Warnf("Did not receive consumer info results for "%s > %s > %s" due to: %s", acc, sa.Config.Name, cfg.Durable, err)
} else if cl := ci.(*ConsumerInfo).Cluster; cl != nil {
curLeader = getHash(cl.Leader)
}
// Re-acquire here.
js.mu.Lock()
}
}
if rBefore < rAfter {
newPeerSet := nca.Group.Peers
// scale up by adding new members from the stream peer set that are not yet in the consumer peer set
streamPeerSet := copyStrings(sa.Group.Peers)
rand.Shuffle(rAfter, func(i, j int) { streamPeerSet[i], streamPeerSet[j] = streamPeerSet[j], streamPeerSet[i] })
for _, p := range streamPeerSet {
found := false
for _, sp := range newPeerSet {
if sp == p {
found = true
break
}
}
if !found {
newPeerSet = append(newPeerSet, p)
if len(newPeerSet) == rAfter {
break
}
}
}
nca.Group.Peers = newPeerSet
nca.Group.Preferred = curLeader
} else if rBefore > rAfter {
newPeerSet := nca.Group.Peers
// mark leader preferred and move it to end
nca.Group.Preferred = curLeader
if nca.Group.Preferred != _EMPTY_ {
for i, p := range newPeerSet {
if nca.Group.Preferred == p {
newPeerSet[i] = newPeerSet[len(newPeerSet)-1]
newPeerSet[len(newPeerSet)-1] = p
}
}
}
// scale down by removing peers from the end
newPeerSet = newPeerSet[len(newPeerSet)-rAfter:]
nca.Group.Peers = newPeerSet
}
// Update config and client info on copy of existing.
nca.Config = cfg
nca.Client = ci
nca.Subject = subject
nca.Reply = reply
ca = nca
}
eca := encodeAddConsumerAssignment(ca)
// Mark this as pending.
if sa.consumers == nil {
sa.consumers = make(map[string]*consumerAssignment)
}
sa.consumers[ca.Name] = ca
// Do formal proposal.
cc.meta.Propose(eca)
}
func encodeAddConsumerAssignment(ca *consumerAssignment) []byte {
var bb bytes.Buffer
bb.WriteByte(byte(assignConsumerOp))
json.NewEncoder(&bb).Encode(ca)
return bb.Bytes()
}
func encodeDeleteConsumerAssignment(ca *consumerAssignment) []byte {
var bb bytes.Buffer
bb.WriteByte(byte(removeConsumerOp))
json.NewEncoder(&bb).Encode(ca)
return bb.Bytes()
}
func decodeConsumerAssignment(buf []byte) (*consumerAssignment, error) {
var ca consumerAssignment
err := json.Unmarshal(buf, &ca)
return &ca, err
}
func encodeAddConsumerAssignmentCompressed(ca *consumerAssignment) []byte {
b, err := json.Marshal(ca)
if err != nil {
return nil
}
// TODO(dlc) - Streaming better approach here probably.
var bb bytes.Buffer
bb.WriteByte(byte(assignCompressedConsumerOp))
bb.Write(s2.Encode(nil, b))
return bb.Bytes()
}
func decodeConsumerAssignmentCompressed(buf []byte) (*consumerAssignment, error) {
var ca consumerAssignment
js, err := s2.Decode(nil, buf)
if err != nil {
return nil, err
}
err = json.Unmarshal(js, &ca)
return &ca, err
}
var errBadStreamMsg = errors.New("jetstream cluster bad replicated stream msg")
func decodeStreamMsg(buf []byte) (subject, reply string, hdr, msg []byte, lseq uint64, ts int64, err error) {
var le = binary.LittleEndian
if len(buf) < 26 {
return _EMPTY_, _EMPTY_, nil, nil, 0, 0, errBadStreamMsg
}
lseq = le.Uint64(buf)
buf = buf[8:]
ts = int64(le.Uint64(buf))
buf = buf[8:]
sl := int(le.Uint16(buf))
buf = buf[2:]
if len(buf) < sl {
return _EMPTY_, _EMPTY_, nil, nil, 0, 0, errBadStreamMsg
}
subject = string(buf[:sl])
buf = buf[sl:]
if len(buf) < 2 {
return _EMPTY_, _EMPTY_, nil, nil, 0, 0, errBadStreamMsg
}
rl := int(le.Uint16(buf))
buf = buf[2:]
if len(buf) < rl {
return _EMPTY_, _EMPTY_, nil, nil, 0, 0, errBadStreamMsg
}
reply = string(buf[:rl])
buf = buf[rl:]
if len(buf) < 2 {
return _EMPTY_, _EMPTY_, nil, nil, 0, 0, errBadStreamMsg
}
hl := int(le.Uint16(buf))
buf = buf[2:]
if len(buf) < hl {
return _EMPTY_, _EMPTY_, nil, nil, 0, 0, errBadStreamMsg
}
if hdr = buf[:hl]; len(hdr) == 0 {
hdr = nil
}
buf = buf[hl:]
if len(buf) < 4 {
return _EMPTY_, _EMPTY_, nil, nil, 0, 0, errBadStreamMsg
}
ml := int(le.Uint32(buf))
buf = buf[4:]
if len(buf) < ml {
return _EMPTY_, _EMPTY_, nil, nil, 0, 0, errBadStreamMsg
}
if msg = buf[:ml]; len(msg) == 0 {
msg = nil
}
return subject, reply, hdr, msg, lseq, ts, nil
}
// Helper to return if compression allowed.
func (mset *stream) compressAllowed() bool {
mset.clMu.Lock()
defer mset.clMu.Unlock()
return mset.compressOK
}
func encodeStreamMsg(subject, reply string, hdr, msg []byte, lseq uint64, ts int64) []byte {
return encodeStreamMsgAllowCompress(subject, reply, hdr, msg, lseq, ts, false)
}
// Threshold for compression.
// TODO(dlc) - Eventually make configurable.
const compressThreshold = 4 * 1024
// If allowed and contents over the threshold we will compress.
func encodeStreamMsgAllowCompress(subject, reply string, hdr, msg []byte, lseq uint64, ts int64, compressOK bool) []byte {
shouldCompress := compressOK && len(subject)+len(reply)+len(hdr)+len(msg) > compressThreshold
elen := 1 + 8 + 8 + len(subject) + len(reply) + len(hdr) + len(msg)
elen += (2 + 2 + 2 + 4) // Encoded lengths, 4bytes
// TODO(dlc) - check sizes of subject, reply and hdr, make sure uint16 ok.
buf := make([]byte, elen)
buf[0] = byte(streamMsgOp)
var le = binary.LittleEndian
wi := 1
le.PutUint64(buf[wi:], lseq)
wi += 8
le.PutUint64(buf[wi:], uint64(ts))
wi += 8
le.PutUint16(buf[wi:], uint16(len(subject)))
wi += 2
copy(buf[wi:], subject)
wi += len(subject)
le.PutUint16(buf[wi:], uint16(len(reply)))
wi += 2
copy(buf[wi:], reply)
wi += len(reply)
le.PutUint16(buf[wi:], uint16(len(hdr)))
wi += 2
if len(hdr) > 0 {
copy(buf[wi:], hdr)
wi += len(hdr)
}
le.PutUint32(buf[wi:], uint32(len(msg)))
wi += 4
if len(msg) > 0 {
copy(buf[wi:], msg)
wi += len(msg)
}
// Check if we should compress.
if shouldCompress {
nbuf := make([]byte, s2.MaxEncodedLen(elen))
nbuf[0] = byte(compressedStreamMsgOp)
ebuf := s2.Encode(nbuf[1:], buf[1:wi])
// Only pay cost of decode the other side if we compressed.
// S2 will allow us to try without major penalty for non-compressable data.
if len(ebuf) < wi {
nbuf = nbuf[:len(ebuf)+1]
buf, wi = nbuf, len(nbuf)
}
}
return buf[:wi]
}
// StreamSnapshot is used for snapshotting and out of band catch up in clustered mode.
type streamSnapshot struct {
Msgs uint64 `json:"messages"`
Bytes uint64 `json:"bytes"`
FirstSeq uint64 `json:"first_seq"`
LastSeq uint64 `json:"last_seq"`
Failed uint64 `json:"clfs"`
Deleted []uint64 `json:"deleted,omitempty"`
}
// Grab a snapshot of a stream for clustered mode.
func (mset *stream) stateSnapshot() []byte {
mset.mu.RLock()
defer mset.mu.RUnlock()
return mset.stateSnapshotLocked()
}
// Grab a snapshot of a stream for clustered mode.
// Lock should be held.
func (mset *stream) stateSnapshotLocked() []byte {
state := mset.store.State()
snap := &streamSnapshot{
Msgs: state.Msgs,
Bytes: state.Bytes,
FirstSeq: state.FirstSeq,
LastSeq: state.LastSeq,
Failed: mset.clfs,
Deleted: state.Deleted,
}
b, _ := json.Marshal(snap)
return b
}
// Will check if we can do message compression in RAFT and catchup logic.
func (mset *stream) checkAllowMsgCompress(peers []string) {
allowed := true
for _, id := range peers {
sir, ok := mset.srv.nodeToInfo.Load(id)
if !ok || sir == nil {
allowed = false
break
}
// Check for capability.
if si := sir.(nodeInfo); si.cfg == nil || !si.cfg.CompressOK {
allowed = false
break
}
}
mset.mu.Lock()
mset.compressOK = allowed
mset.mu.Unlock()
}
// To warn when we are getting too far behind from what has been proposed vs what has been committed.
const streamLagWarnThreshold = 10_000
// processClusteredMsg will propose the inbound message to the underlying raft group.
func (mset *stream) processClusteredInboundMsg(subject, reply string, hdr, msg []byte) error {
// For possible error response.
var response []byte
mset.mu.RLock()
canRespond := !mset.cfg.NoAck && len(reply) > 0
name, stype, store := mset.cfg.Name, mset.cfg.Storage, mset.store
s, js, jsa, st, rf, tierName, outq, node := mset.srv, mset.js, mset.jsa, mset.cfg.Storage, mset.cfg.Replicas, mset.tier, mset.outq, mset.node
maxMsgSize, lseq, clfs := int(mset.cfg.MaxMsgSize), mset.lseq, mset.clfs
isLeader, isSealed := mset.isLeader(), mset.cfg.Sealed
mset.mu.RUnlock()
// This should not happen but possible now that we allow scale up, and scale down where this could trigger.
if node == nil {
return mset.processJetStreamMsg(subject, reply, hdr, msg, 0, 0)
}
// Check that we are the leader. This can be false if we have scaled up from an R1 that had inbound queued messages.
if !isLeader {
return NewJSClusterNotLeaderError()
}
// Bail here if sealed.
if isSealed {
var resp = JSPubAckResponse{PubAck: &PubAck{Stream: mset.name()}, Error: NewJSStreamSealedError()}
b, _ := json.Marshal(resp)
mset.outq.sendMsg(reply, b)
return NewJSStreamSealedError()
}
// Check here pre-emptively if we have exceeded this server limits.
if js.limitsExceeded(stype) {
s.resourcesExeededError()
if canRespond {
b, _ := json.Marshal(&JSPubAckResponse{PubAck: &PubAck{Stream: name}, Error: NewJSInsufficientResourcesError()})
outq.send(newJSPubMsg(reply, _EMPTY_, _EMPTY_, nil, b, nil, 0))
}
// Stepdown regardless.
if node := mset.raftNode(); node != nil {
node.StepDown()
}
return NewJSInsufficientResourcesError()
}
// Check here pre-emptively if we have exceeded our account limits.
var exceeded bool
jsa.usageMu.Lock()
jsaLimits, ok := jsa.limits[tierName]
if !ok {
jsa.usageMu.Unlock()
err := fmt.Errorf("no JetStream resource limits found account: %q", jsa.acc().Name)
s.RateLimitWarnf(err.Error())
if canRespond {
var resp = &JSPubAckResponse{PubAck: &PubAck{Stream: name}}
resp.Error = NewJSNoLimitsError()
response, _ = json.Marshal(resp)
outq.send(newJSPubMsg(reply, _EMPTY_, _EMPTY_, nil, response, nil, 0))
}
return err
}
t, ok := jsa.usage[tierName]
if !ok {
t = &jsaStorage{}
jsa.usage[tierName] = t
}
if st == MemoryStorage {
total := t.total.store + int64(memStoreMsgSize(subject, hdr, msg)*uint64(rf))
if jsaLimits.MaxMemory > 0 && total > jsaLimits.MaxMemory {
exceeded = true
}
} else {
total := t.total.store + int64(fileStoreMsgSize(subject, hdr, msg)*uint64(rf))
if jsaLimits.MaxStore > 0 && total > jsaLimits.MaxStore {
exceeded = true
}
}
jsa.usageMu.Unlock()
// If we have exceeded our account limits go ahead and return.
if exceeded {
err := fmt.Errorf("JetStream resource limits exceeded for account: %q", jsa.acc().Name)
s.RateLimitWarnf(err.Error())
if canRespond {
var resp = &JSPubAckResponse{PubAck: &PubAck{Stream: name}}
resp.Error = NewJSAccountResourcesExceededError()
response, _ = json.Marshal(resp)
outq.send(newJSPubMsg(reply, _EMPTY_, _EMPTY_, nil, response, nil, 0))
}
return err
}
// Check msgSize if we have a limit set there. Again this works if it goes through but better to be pre-emptive.
if maxMsgSize >= 0 && (len(hdr)+len(msg)) > maxMsgSize {
err := fmt.Errorf("JetStream message size exceeds limits for "%s > %s"", jsa.acc().Name, mset.cfg.Name)
s.RateLimitWarnf(err.Error())
if canRespond {
var resp = &JSPubAckResponse{PubAck: &PubAck{Stream: name}}
resp.Error = NewJSStreamMessageExceedsMaximumError()
response, _ = json.Marshal(resp)
outq.send(newJSPubMsg(reply, _EMPTY_, _EMPTY_, nil, response, nil, 0))
}
return err
}
// Some header checks can be checked pre proposal. Most can not.
if len(hdr) > 0 {
// For CAS operations, e.g. ExpectedLastSeqPerSubject, we can also check here and not have to go through.
// Can only precheck for seq != 0.
if seq, exists := getExpectedLastSeqPerSubject(hdr); exists && store != nil && seq > 0 {
var smv StoreMsg
var fseq uint64
sm, err := store.LoadLastMsg(subject, &smv)
if sm != nil {
fseq = sm.seq
}
if err != nil || fseq != seq {
if canRespond {
var resp = &JSPubAckResponse{PubAck: &PubAck{Stream: name}}
resp.PubAck = &PubAck{Stream: name}
resp.Error = NewJSStreamWrongLastSequenceError(fseq)
b, _ := json.Marshal(resp)
outq.sendMsg(reply, b)
}
return fmt.Errorf("last sequence by subject mismatch: %d vs %d", seq, fseq)
}
}
// Expected stream name can also be pre-checked.
if sname := getExpectedStream(hdr); sname != _EMPTY_ && sname != name {
if canRespond {
var resp = &JSPubAckResponse{PubAck: &PubAck{Stream: name}}
resp.PubAck = &PubAck{Stream: name}
resp.Error = NewJSStreamNotMatchError()
b, _ := json.Marshal(resp)
outq.sendMsg(reply, b)
}
return errors.New("expected stream does not match")
}
}
// Since we encode header len as u16 make sure we do not exceed.
// Again this works if it goes through but better to be pre-emptive.
if len(hdr) > math.MaxUint16 {
err := fmt.Errorf("JetStream header size exceeds limits for "%s > %s"", jsa.acc().Name, mset.cfg.Name)
s.RateLimitWarnf(err.Error())
if canRespond {
var resp = &JSPubAckResponse{PubAck: &PubAck{Stream: name}}
resp.Error = NewJSStreamHeaderExceedsMaximumError()
response, _ = json.Marshal(resp)
outq.send(newJSPubMsg(reply, _EMPTY_, _EMPTY_, nil, response, nil, 0))
}
return err
}
// Proceed with proposing this message.
// We only use mset.clseq for clustering and in case we run ahead of actual commits.
// Check if we need to set initial value here
mset.clMu.Lock()
if mset.clseq == 0 || mset.clseq < lseq {
// Re-capture
lseq, clfs = mset.lastSeqAndCLFS()
mset.clseq = lseq + clfs
}
esm := encodeStreamMsgAllowCompress(subject, reply, hdr, msg, mset.clseq, time.Now().UnixNano(), mset.compressOK)
mset.clseq++
// Do proposal.
err := node.Propose(esm)
if err != nil && mset.clseq > 0 {
mset.clseq--
}
// Check to see if we are being overrun.
// TODO(dlc) - Make this a limit where we drop messages to protect ourselves, but allow to be configured.
if mset.clseq-(lseq+clfs) > streamLagWarnThreshold {
lerr := fmt.Errorf("JetStream stream "%s > %s" has high message lag", jsa.acc().Name, mset.cfg.Name)
s.RateLimitWarnf(lerr.Error())
}
mset.clMu.Unlock()
if err != nil {
if canRespond {
var resp = &JSPubAckResponse{PubAck: &PubAck{Stream: mset.cfg.Name}}
resp.Error = &ApiError{Code: 503, Description: err.Error()}
response, _ = json.Marshal(resp)
// If we errored out respond here.
outq.send(newJSPubMsg(reply, _EMPTY_, _EMPTY_, nil, response, nil, 0))
}
}
if err != nil && isOutOfSpaceErr(err) {
s.handleOutOfSpace(mset)
}
return err
}
// For requesting messages post raft snapshot to catch up streams post server restart.
// Any deleted msgs etc will be handled inline on catchup.
type streamSyncRequest struct {
Peer string `json:"peer,omitempty"`
FirstSeq uint64 `json:"first_seq"`
LastSeq uint64 `json:"last_seq"`
}
// Given a stream state that represents a snapshot, calculate the sync request based on our current state.
func (mset *stream) calculateSyncRequest(state *StreamState, snap *streamSnapshot) *streamSyncRequest {
// Quick check if we are already caught up.
if state.LastSeq >= snap.LastSeq {
return nil
}
return &streamSyncRequest{FirstSeq: state.LastSeq + 1, LastSeq: snap.LastSeq, Peer: mset.node.ID()}
}
// processSnapshotDeletes will update our current store based on the snapshot
// but only processing deletes and new FirstSeq / purges.
func (mset *stream) processSnapshotDeletes(snap *streamSnapshot) {
var state StreamState
mset.store.FastState(&state)
// Always adjust if FirstSeq has moved beyond our state.
if snap.FirstSeq > state.FirstSeq {
mset.store.Compact(snap.FirstSeq)
mset.store.FastState(&state)
mset.setLastSeq(state.LastSeq)
}
// Range the deleted and delete if applicable.
for _, dseq := range snap.Deleted {
if dseq > state.FirstSeq && dseq <= state.LastSeq {
mset.store.RemoveMsg(dseq)
}
}
}
func (mset *stream) setCatchupPeer(peer string, lag uint64) {
if peer == _EMPTY_ {
return
}
mset.mu.Lock()
if mset.catchups == nil {
mset.catchups = make(map[string]uint64)
}
mset.catchups[peer] = lag
mset.mu.Unlock()
}
// Will decrement by one.
func (mset *stream) updateCatchupPeer(peer string) {
if peer == _EMPTY_ {
return
}
mset.mu.Lock()
if lag := mset.catchups[peer]; lag > 0 {
mset.catchups[peer] = lag - 1
}
mset.mu.Unlock()
}
func (mset *stream) clearCatchupPeer(peer string) {
mset.mu.Lock()
if mset.catchups != nil {
delete(mset.catchups, peer)
}
mset.mu.Unlock()
}
// Lock should be held.
func (mset *stream) clearAllCatchupPeers() {
if mset.catchups != nil {
mset.catchups = nil
}
}
func (mset *stream) lagForCatchupPeer(peer string) uint64 {
mset.mu.RLock()
defer mset.mu.RUnlock()
if mset.catchups == nil {
return 0
}
return mset.catchups[peer]
}
func (mset *stream) hasCatchupPeers() bool {
mset.mu.RLock()
defer mset.mu.RUnlock()
return len(mset.catchups) > 0
}
func (mset *stream) setCatchingUp() {
mset.mu.Lock()
mset.catchup = true
mset.mu.Unlock()
}
func (mset *stream) clearCatchingUp() {
mset.mu.Lock()
mset.catchup = false
mset.mu.Unlock()
}
func (mset *stream) isCatchingUp() bool {
mset.mu.RLock()
defer mset.mu.RUnlock()
return mset.catchup
}
// Determine if a non-leader is current.
// Lock should be held.
func (mset *stream) isCurrent() bool {
if mset.node == nil {
return true
}
return mset.node.Current() && !mset.catchup
}
// Maximum requests for the whole server that can be in flight.
const maxConcurrentSyncRequests = 8
var (
errCatchupCorruptSnapshot = errors.New("corrupt stream snapshot detected")
errCatchupStalled = errors.New("catchup stalled")
errCatchupStreamStopped = errors.New("stream has been stopped") // when a catchup is terminated due to the stream going away.
errCatchupBadMsg = errors.New("bad catchup msg")
errCatchupWrongSeqForSkip = errors.New("wrong sequence for skipped msg")
)
// Process a stream snapshot.
func (mset *stream) processSnapshot(snap *streamSnapshot) (e error) {
// Update any deletes, etc.
mset.processSnapshotDeletes(snap)
mset.mu.Lock()
var state StreamState
mset.clfs = snap.Failed
mset.store.FastState(&state)
sreq := mset.calculateSyncRequest(&state, snap)
s, js, subject, n := mset.srv, mset.js, mset.sa.Sync, mset.node
qname := fmt.Sprintf("[ACC:%s] stream "%s" snapshot", mset.acc.Name, mset.cfg.Name)
mset.mu.Unlock()
// Bug that would cause this to be empty on stream update.
if subject == _EMPTY_ {
return errCatchupCorruptSnapshot
}
// Just return if up to date or already exceeded limits.
if sreq == nil || js.limitsExceeded(mset.cfg.Storage) {
return nil
}
// Pause the apply channel for our raft group while we catch up.
if err := n.PauseApply(); err != nil {
return err
}
defer func() {
// Don"t bother resuming if server or stream is gone.
if e != errCatchupStreamStopped && e != ErrServerNotRunning {
n.ResumeApply()
}
}()
// Set our catchup state.
mset.setCatchingUp()
defer mset.clearCatchingUp()
var sub *subscription
var err error
const activityInterval = 10 * time.Second
notActive := time.NewTimer(activityInterval)
defer notActive.Stop()
defer func() {
if sub != nil {
s.sysUnsubscribe(sub)
}
// Make sure any consumers are updated for the pending amounts.
mset.mu.Lock()
for _, o := range mset.consumers {
o.mu.Lock()
if o.isLeader() {
o.streamNumPending()
}
o.mu.Unlock()
}
mset.mu.Unlock()
}()
var releaseSem bool
releaseSyncOutSem := func() {
if !releaseSem {
return
}
// Need to use select for the server shutdown case.
select {
case s.syncOutSem <- struct{}{}:
default:
}
releaseSem = false
}
// On exit, we will release our semaphore if we acquired it.
defer releaseSyncOutSem()
// Check our final state when we exit cleanly.
// If this snapshot was for messages no longer held by the leader we want to make sure
// we are synched for the next message sequence properly.
lastRequested := sreq.LastSeq
checkFinalState := func() {
if mset != nil {
mset.mu.Lock()
var state StreamState
mset.store.FastState(&state)
var didReset bool
firstExpected := lastRequested + 1
if state.FirstSeq != firstExpected {
// Reset our notion of first.
mset.store.Compact(firstExpected)
mset.store.FastState(&state)
// Make sure last is also correct in case this also moved.
mset.lseq = state.LastSeq
didReset = true
}
mset.mu.Unlock()
if didReset {
s.Warnf("Catchup for stream "%s > %s" resetting first sequence: %d on catchup complete",
mset.account(), mset.name(), firstExpected)
}
}
}
RETRY:
// On retry, we need to release the semaphore we got. Call will be no-op
// if releaseSem boolean has not been set to true on successfully getting
// the semaphore.
releaseSyncOutSem()
if n.GroupLeader() == _EMPTY_ {
return fmt.Errorf("catchup for stream "%s > %s" aborted, no leader", mset.account(), mset.name())
}
// If we have a sub clear that here.
if sub != nil {
s.sysUnsubscribe(sub)
sub = nil
}
// Block here if we have too many requests in flight.
<-s.syncOutSem
releaseSem = true
if !s.isRunning() {
return ErrServerNotRunning
}
// We may have been blocked for a bit, so the reset need to ensure that we
// consume the already fired timer.
if !notActive.Stop() {
select {
case <-notActive.C:
default:
}
}
notActive.Reset(activityInterval)
// Grab sync request again on failures.
if sreq == nil {
mset.mu.Lock()
var state StreamState
mset.store.FastState(&state)
sreq = mset.calculateSyncRequest(&state, snap)
mset.mu.Unlock()
if sreq == nil {
return nil
}
// Reset notion of lastRequested
lastRequested = sreq.LastSeq
}
// Used to transfer message from the wire to another Go routine internally.
type im struct {
msg []byte
reply string
}
// This is used to notify the leader that it should stop the runCatchup
// because we are either bailing out or going to retry due to an error.
notifyLeaderStopCatchup := func(mrec *im, err error) {
if mrec.reply == _EMPTY_ {
return
}
s.sendInternalMsgLocked(mrec.reply, _EMPTY_, nil, err.Error())
}
msgsQ := newIPQueue[*im](s, qname)
defer msgsQ.unregister()
// Send our catchup request here.
reply := syncReplySubject()
sub, err = s.sysSubscribe(reply, func(_ *subscription, _ *client, _ *Account, _, reply string, msg []byte) {
// Make copies
// TODO(dlc) - Since we are using a buffer from the inbound client/route.
msgsQ.push(&im{copyBytes(msg), reply})
})
if err != nil {
s.Errorf("Could not subscribe to stream catchup: %v", err)
goto RETRY
}
// Send our sync request.
b, _ := json.Marshal(sreq)
s.sendInternalMsgLocked(subject, reply, nil, b)
// Remember when we sent this out to avoimd loop spins on errors below.
reqSendTime := time.Now()
// Clear our sync request and capture last.
last := sreq.LastSeq
sreq = nil
// Run our own select loop here.
for qch, lch := n.QuitC(), n.LeadChangeC(); ; {
select {
case <-msgsQ.ch:
notActive.Reset(activityInterval)
mrecs := msgsQ.pop()
for _, mrec := range mrecs {
msg := mrec.msg
// Check for eof signaling.
if len(msg) == 0 {
msgsQ.recycle(&mrecs)
checkFinalState()
return nil
}
if lseq, err := mset.processCatchupMsg(msg); err == nil {
if mrec.reply != _EMPTY_ {
s.sendInternalMsgLocked(mrec.reply, _EMPTY_, nil, nil)
}
if lseq >= last {
msgsQ.recycle(&mrecs)
return nil
}
} else if isOutOfSpaceErr(err) {
notifyLeaderStopCatchup(mrec, err)
return err
} else if err == NewJSInsufficientResourcesError() {
notifyLeaderStopCatchup(mrec, err)
if mset.js.limitsExceeded(mset.cfg.Storage) {
s.resourcesExeededError()
} else {
s.Warnf("Catchup for stream "%s > %s" errored, account resources exceeded: %v", mset.account(), mset.name(), err)
}
msgsQ.recycle(&mrecs)
return err
} else {
notifyLeaderStopCatchup(mrec, err)
s.Warnf("Catchup for stream "%s > %s" errored, will retry: %v", mset.account(), mset.name(), err)
msgsQ.recycle(&mrecs)
// Make sure we do not spin and make things worse.
const minRetryWait = 2 * time.Second
elapsed := time.Since(reqSendTime)
if elapsed < minRetryWait {
select {
case <-s.quitCh:
return ErrServerNotRunning
case <-qch:
return errCatchupStreamStopped
case <-time.After(minRetryWait - elapsed):
}
}
goto RETRY
}
}
msgsQ.recycle(&mrecs)
case <-notActive.C:
if mrecs := msgsQ.pop(); len(mrecs) > 0 {
mrec := mrecs[0]
notifyLeaderStopCatchup(mrec, errCatchupStalled)
msgsQ.recycle(&mrecs)
}
s.Warnf("Catchup for stream "%s > %s" stalled", mset.account(), mset.name())
goto RETRY
case <-s.quitCh:
return ErrServerNotRunning
case <-qch:
return errCatchupStreamStopped
case isLeader := <-lch:
if isLeader {
n.StepDown()
goto RETRY
}
}
}
}
// processCatchupMsg will be called to process out of band catchup msgs from a sync request.
func (mset *stream) processCatchupMsg(msg []byte) (uint64, error) {
if len(msg) == 0 {
return 0, errCatchupBadMsg
}
op := entryOp(msg[0])
if op != streamMsgOp && op != compressedStreamMsgOp {
return 0, errCatchupBadMsg
}
mbuf := msg[1:]
if op == compressedStreamMsgOp {
var err error
mbuf, err = s2.Decode(nil, mbuf)
if err != nil {
panic(err.Error())
}
}
subj, _, hdr, msg, seq, ts, err := decodeStreamMsg(mbuf)
if err != nil {
return 0, errCatchupBadMsg
}
mset.mu.RLock()
st := mset.cfg.Storage
ddloaded := mset.ddloaded
tierName := mset.tier
mset.mu.RUnlock()
if mset.js.limitsExceeded(st) {
return 0, NewJSInsufficientResourcesError()
} else if exceeded, apiErr := mset.jsa.limitsExceeded(st, tierName); apiErr != nil {
return 0, apiErr
} else if exceeded {
return 0, NewJSInsufficientResourcesError()
}
// Put into our store
// Messages to be skipped have no subject or timestamp.
// TODO(dlc) - formalize with skipMsgOp
if subj == _EMPTY_ && ts == 0 {
if lseq := mset.store.SkipMsg(); lseq != seq {
return 0, errCatchupWrongSeqForSkip
}
} else if err := mset.store.StoreRawMsg(subj, hdr, msg, seq, ts); err != nil {
return 0, err
}
// Update our lseq.
mset.setLastSeq(seq)
// Check for MsgId and if we have one here make sure to update our internal map.
if len(hdr) > 0 {
if msgId := getMsgId(hdr); msgId != _EMPTY_ {
if !ddloaded {
mset.mu.Lock()
mset.rebuildDedupe()
mset.mu.Unlock()
}
mset.storeMsgId(&ddentry{msgId, seq, ts})
}
}
return seq, nil
}
func (mset *stream) handleClusterSyncRequest(sub *subscription, c *client, _ *Account, subject, reply string, msg []byte) {
var sreq streamSyncRequest
if err := json.Unmarshal(msg, &sreq); err != nil {
// Log error.
return
}
mset.srv.startGoRoutine(func() { mset.runCatchup(reply, &sreq) })
}
// Lock should be held.
func (js *jetStream) offlineClusterInfo(rg *raftGroup) *ClusterInfo {
s := js.srv
ci := &ClusterInfo{Name: s.ClusterName()}
for _, peer := range rg.Peers {
if sir, ok := s.nodeToInfo.Load(peer); ok && sir != nil {
si := sir.(nodeInfo)
pi := &PeerInfo{Peer: peer, Name: si.name, Current: false, Offline: true}
ci.Replicas = append(ci.Replicas, pi)
}
}
return ci
}
// clusterInfo will report on the status of the raft group.
func (js *jetStream) clusterInfo(rg *raftGroup) *ClusterInfo {
if js == nil {
return nil
}
js.mu.RLock()
defer js.mu.RUnlock()
s := js.srv
if rg == nil || rg.node == nil {
return &ClusterInfo{
Name: s.ClusterName(),
Leader: s.Name(),
}
}
n := rg.node
ci := &ClusterInfo{
Name: s.ClusterName(),
Leader: s.serverNameForNode(n.GroupLeader()),
}
now := time.Now()
id, peers := n.ID(), n.Peers()
// If we are leaderless, do not suppress putting us in the peer list.
if ci.Leader == _EMPTY_ {
id = _EMPTY_
}
for _, rp := range peers {
if rp.ID != id && rg.isMember(rp.ID) {
var lastSeen time.Duration
if now.After(rp.Last) && rp.Last.Unix() != 0 {
lastSeen = now.Sub(rp.Last)
}
current := rp.Current
if current && lastSeen > lostQuorumInterval {
current = false
}
// Create a peer info with common settings if the peer has not been seen
// yet (which can happen after the whole cluster is stopped and only some
// of the nodes are restarted).
pi := &PeerInfo{
Current: current,
Offline: true,
Active: lastSeen,
Lag: rp.Lag,
Peer: rp.ID,
}
// If node is found, complete/update the settings.
if sir, ok := s.nodeToInfo.Load(rp.ID); ok && sir != nil {
si := sir.(nodeInfo)
pi.Name, pi.Offline, pi.cluster = si.name, si.offline, si.cluster
} else {
// If not, then add a name that indicates that the server name
// is unknown at this time, and clear the lag since it is misleading
// (the node may not have that much lag).
// Note: We return now the Peer ID in PeerInfo, so the "(peerID: %s)"
// would technically not be required, but keeping it for now.
pi.Name, pi.Lag = fmt.Sprintf("Server name unknown at this time (peerID: %s)", rp.ID), 0
}
ci.Replicas = append(ci.Replicas, pi)
}
}
// Order the result based on the name so that we get something consistent
// when doing repeated stream info in the CLI, etc...
sort.Slice(ci.Replicas, func(i, j int) bool {
return ci.Replicas[i].Name < ci.Replicas[j].Name
})
return ci
}
func (mset *stream) checkClusterInfo(ci *ClusterInfo) {
for _, r := range ci.Replicas {
peer := getHash(r.Name)
if lag := mset.lagForCatchupPeer(peer); lag > 0 {
r.Current = false
r.Lag = lag
}
}
}
// Return a list of alternates, ranked by preference order to the request, of stream mirrors.
// This allows clients to select or get more information about read replicas that could be a
// better option to connect to versus the original source.
func (js *jetStream) streamAlternates(ci *ClientInfo, stream string) []StreamAlternate {
if js == nil {
return nil
}
js.mu.RLock()
defer js.mu.RUnlock()
s, cc := js.srv, js.cluster
// Track our domain.
domain := s.getOpts().JetStreamDomain
// No clustering just return nil.
if cc == nil {
return nil
}
acc, _ := s.LookupAccount(ci.serviceAccount())
if acc == nil {
return nil
}
// Collect our ordering first for clusters.
weights := make(map[string]int)
all := []string{ci.Cluster}
all = append(all, ci.Alternates...)
for i := 0; i < len(all); i++ {
weights[all[i]] = len(all) - i
}
var alts []StreamAlternate
for _, sa := range cc.streams[acc.Name] {
// Add in ourselves and any mirrors.
if sa.Config.Name == stream || (sa.Config.Mirror != nil && sa.Config.Mirror.Name == stream) {
alts = append(alts, StreamAlternate{Name: sa.Config.Name, Domain: domain, Cluster: sa.Group.Cluster})
}
}
// If just us don"t fill in.
if len(alts) == 1 {
return nil
}
// Sort based on our weights that originate from the request itself.
sort.Slice(alts, func(i, j int) bool {
return weights[alts[i].Cluster] > weights[alts[j].Cluster]
})
return alts
}
// Internal request for stream info, this is coming on the wire so do not block here.
func (mset *stream) handleClusterStreamInfoRequest(_ *subscription, c *client, _ *Account, subject, reply string, _ []byte) {
go mset.processClusterStreamInfoRequest(reply)
}
func (mset *stream) processClusterStreamInfoRequest(reply string) {
mset.mu.RLock()
sysc, js, sa, config := mset.sysc, mset.srv.js, mset.sa, mset.cfg
isLeader := mset.isLeader()
mset.mu.RUnlock()
// By design all members will receive this. Normally we only want the leader answering.
// But if we have stalled and lost quorom all can respond.
if sa != nil && !js.isGroupLeaderless(sa.Group) && !isLeader {
return
}
// If we are not the leader let someone else possible respond first.
if !isLeader {
time.Sleep(200 * time.Millisecond)
}
si := &StreamInfo{
Created: mset.createdTime(),
State: mset.state(),
Config: config,
Cluster: js.clusterInfo(mset.raftGroup()),
Sources: mset.sourcesInfo(),
Mirror: mset.mirrorInfo(),
}
// Check for out of band catchups.
if mset.hasCatchupPeers() {
mset.checkClusterInfo(si.Cluster)
}
sysc.sendInternalMsg(reply, _EMPTY_, nil, si)
}
// 64MB for now, for the total server. This is max we will blast out if asked to
// do so to another server for purposes of catchups.
// This number should be ok on 1Gbit interface.
const defaultMaxTotalCatchupOutBytes = int64(64 * 1024 * 1024)
// Current total outstanding catchup bytes.
func (s *Server) gcbTotal() int64 {
s.gcbMu.RLock()
defer s.gcbMu.RUnlock()
return s.gcbOut
}
// Returns true if Current total outstanding catchup bytes is below
// the maximum configured.
func (s *Server) gcbBelowMax() bool {
s.gcbMu.RLock()
defer s.gcbMu.RUnlock()
return s.gcbOut <= s.gcbOutMax
}
// Adds `sz` to the server"s total outstanding catchup bytes and to `localsz`
// under the gcbMu lock. The `localsz` points to the local outstanding catchup
// bytes of the runCatchup go routine of a given stream.
func (s *Server) gcbAdd(localsz *int64, sz int64) {
s.gcbMu.Lock()
atomic.AddInt64(localsz, sz)
s.gcbOut += sz
if s.gcbOut >= s.gcbOutMax && s.gcbKick == nil {
s.gcbKick = make(chan struct{})
}
s.gcbMu.Unlock()
}
// Removes `sz` from the server"s total outstanding catchup bytes and from
// `localsz`, but only if `localsz` is non 0, which would signal that gcSubLast
// has already been invoked. See that function for details.
// Must be invoked under the gcbMu lock.
func (s *Server) gcbSubLocked(localsz *int64, sz int64) {
if atomic.LoadInt64(localsz) == 0 {
return
}
atomic.AddInt64(localsz, -sz)
s.gcbOut -= sz
if s.gcbKick != nil && s.gcbOut < s.gcbOutMax {
close(s.gcbKick)
s.gcbKick = nil
}
}
// Locked version of gcbSubLocked()
func (s *Server) gcbSub(localsz *int64, sz int64) {
s.gcbMu.Lock()
s.gcbSubLocked(localsz, sz)
s.gcbMu.Unlock()
}
// Similar to gcbSub() but reset `localsz` to 0 at the end under the gcbMu lock.
// This will signal further calls to gcbSub() for this `localsz` pointer that
// nothing should be done because runCatchup() has exited and any remaining
// outstanding bytes value has already been decremented.
func (s *Server) gcbSubLast(localsz *int64) {
s.gcbMu.Lock()
s.gcbSubLocked(localsz, *localsz)
*localsz = 0
s.gcbMu.Unlock()
}
// Returns our kick chan, or nil if it does not exist.
func (s *Server) cbKickChan() <-chan struct{} {
s.gcbMu.RLock()
defer s.gcbMu.RUnlock()
return s.gcbKick
}
func (mset *stream) runCatchup(sendSubject string, sreq *streamSyncRequest) {
s := mset.srv
defer s.grWG.Done()
const maxOutBytes = int64(8 * 1024 * 1024) // 8MB for now, these are all internal, from server to server
const maxOutMsgs = int32(32 * 1024)
outb := int64(0)
outm := int32(0)
// On abnormal exit make sure to update global total.
defer s.gcbSubLast(&outb)
// Flow control processing.
ackReplySize := func(subj string) int64 {
if li := strings.LastIndexByte(subj, btsep); li > 0 && li < len(subj) {
return parseAckReplyNum(subj[li+1:])
}
return 0
}
nextBatchC := make(chan struct{}, 1)
nextBatchC <- struct{}{}
remoteQuitCh := make(chan struct{})
// Setup ackReply for flow control.
ackReply := syncAckSubject()
ackSub, _ := s.sysSubscribe(ackReply, func(sub *subscription, c *client, _ *Account, subject, reply string, msg []byte) {
if len(msg) > 0 {
s.Warnf("Catchup for stream "%s > %s" was aborted on the remote due to: %q",
mset.account(), mset.name(), msg)
s.sysUnsubscribe(sub)
close(remoteQuitCh)
return
}
sz := ackReplySize(subject)
s.gcbSub(&outb, sz)
atomic.AddInt32(&outm, -1)
mset.updateCatchupPeer(sreq.Peer)
// Kick ourselves and anyone else who might have stalled on global state.
select {
case nextBatchC <- struct{}{}:
default:
}
})
defer s.sysUnsubscribe(ackSub)
ackReplyT := strings.ReplaceAll(ackReply, ".*", ".%d")
const activityInterval = 5 * time.Second
notActive := time.NewTimer(activityInterval)
defer notActive.Stop()
// Grab our state.
var state StreamState
mset.mu.RLock()
mset.store.FastState(&state)
mset.mu.RUnlock()
// Reset notion of first if this request wants sequences before our starting sequence
// and we would have nothing to send. If we have partial messages still need to send skips for those.
if sreq.FirstSeq < state.FirstSeq && state.FirstSeq > sreq.LastSeq {
s.Debugf("Catchup for stream "%s > %s" resetting request first sequence from %d to %d",
mset.account(), mset.name(), sreq.FirstSeq, state.FirstSeq)
sreq.FirstSeq = state.FirstSeq
}
// Setup sequences to walk through.
seq, last := sreq.FirstSeq, sreq.LastSeq
mset.setCatchupPeer(sreq.Peer, last-seq)
// Check if we can compress during this.
compressOk := mset.compressAllowed()
var spb int
sendNextBatchAndContinue := func(qch chan struct{}) bool {
// Update our activity timer.
notActive.Reset(activityInterval)
// Check if we know we will not enter the loop because we are done.
if seq > last {
s.Noticef("Catchup for stream "%s > %s" complete", mset.account(), mset.name())
// EOF
s.sendInternalMsgLocked(sendSubject, _EMPTY_, nil, nil)
return false
}
// If we already sent a batch, we will try to make sure we process around
// half the FC responses - or reach a certain amount of time - before sending
// the next batch.
if spb > 0 {
mw := time.NewTimer(100 * time.Millisecond)
for done := false; !done; {
select {
case <-nextBatchC:
done = int(atomic.LoadInt32(&outm)) <= spb/2
case <-mw.C:
done = true
case <-s.quitCh:
return false
case <-qch:
return false
case <-remoteQuitCh:
return false
}
}
spb = 0
}
var smv StoreMsg
for ; seq <= last && atomic.LoadInt64(&outb) <= maxOutBytes && atomic.LoadInt32(&outm) <= maxOutMsgs && s.gcbBelowMax(); seq++ {
sm, err := mset.store.LoadMsg(seq, &smv)
// if this is not a deleted msg, bail out.
if err != nil && err != ErrStoreMsgNotFound && err != errDeletedMsg {
if err == ErrStoreEOF {
var state StreamState
mset.store.FastState(&state)
if seq > state.LastSeq {
// The snapshot has a larger last sequence then we have. This could be due to a truncation
// when trying to recover after corruption, still not 100% sure. Could be off by 1 too somehow,
// but tested a ton of those with no success.
s.Warnf("Catchup for stream "%s > %s" completed, but requested sequence %d was larger then current state: %+v",
mset.account(), mset.name(), seq, state)
// Try our best to redo our invalidated snapshot as well.
if n := mset.raftNode(); n != nil {
n.InstallSnapshot(mset.stateSnapshot())
}
// Signal EOF
s.sendInternalMsgLocked(sendSubject, _EMPTY_, nil, nil)
return false
}
}
s.Warnf("Error loading message for catchup "%s > %s": %v", mset.account(), mset.name(), err)
return false
}
var em []byte
if sm != nil {
em = encodeStreamMsgAllowCompress(sm.subj, _EMPTY_, sm.hdr, sm.msg, sm.seq, sm.ts, compressOk)
} else {
// Skip record for deleted msg.
em = encodeStreamMsg(_EMPTY_, _EMPTY_, nil, nil, seq, 0)
}
// Place size in reply subject for flow control.
l := int64(len(em))
reply := fmt.Sprintf(ackReplyT, l)
s.gcbAdd(&outb, l)
atomic.AddInt32(&outm, 1)
s.sendInternalMsgLocked(sendSubject, reply, nil, em)
spb++
if seq == last {
s.Noticef("Catchup for stream "%s > %s" complete", mset.account(), mset.name())
// EOF
s.sendInternalMsgLocked(sendSubject, _EMPTY_, nil, nil)
return false
}
select {
case <-remoteQuitCh:
return false
default:
}
}
return true
}
// Grab stream quit channel.
mset.mu.RLock()
qch := mset.qch
mset.mu.RUnlock()
if qch == nil {
return
}
// Run as long as we are still active and need catchup.
// FIXME(dlc) - Purge event? Stream delete?
for {
// Get this each time, will be non-nil if globally blocked and we will close to wake everyone up.
cbKick := s.cbKickChan()
select {
case <-s.quitCh:
return
case <-qch:
return
case <-remoteQuitCh:
mset.clearCatchupPeer(sreq.Peer)
return
case <-notActive.C:
s.Warnf("Catchup for stream "%s > %s" stalled", mset.account(), mset.name())
return
case <-nextBatchC:
if !sendNextBatchAndContinue(qch) {
mset.clearCatchupPeer(sreq.Peer)
return
}
case <-cbKick:
if !sendNextBatchAndContinue(qch) {
mset.clearCatchupPeer(sreq.Peer)
return
}
}
}
}
const jscAllSubj = "$JSC.>"
func syncSubjForStream() string {
return syncSubject("$JSC.SYNC")
}
func syncReplySubject() string {
return syncSubject("$JSC.R")
}
func infoReplySubject() string {
return syncSubject("$JSC.R")
}
func syncAckSubject() string {
return syncSubject("$JSC.ACK") + ".*"
}
func syncSubject(pre string) string {
var sb strings.Builder
sb.WriteString(pre)
sb.WriteByte(btsep)
var b [replySuffixLen]byte
rn := rand.Int63()
for i, l := 0, rn; i < len(b); i++ {
b[i] = digits[l%base]
l /= base
}
sb.Write(b[:])
return sb.String()
}
const (
clusterStreamInfoT = "$JSC.SI.%s.%s"
clusterConsumerInfoT = "$JSC.CI.%s.%s.%s"
jsaUpdatesSubT = "$JSC.ARU.%s.*"
jsaUpdatesPubT = "$JSC.ARU.%s.%s"
)
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