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server.go
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server.go
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// Licensed to the LF AI & Data foundation under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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 querycoordv2
import (
"context"
"fmt"
"os"
"sync"
"syscall"
"time"
"github.com/blang/semver/v4"
"github.com/cockroachdb/errors"
"github.com/samber/lo"
"github.com/tikv/client-go/v2/txnkv"
clientv3 "go.etcd.io/etcd/client/v3"
"go.uber.org/atomic"
"go.uber.org/zap"
"github.com/milvus-io/milvus-proto/go-api/v2/commonpb"
"github.com/milvus-io/milvus-proto/go-api/v2/milvuspb"
"github.com/milvus-io/milvus/internal/allocator"
"github.com/milvus-io/milvus/internal/kv"
etcdkv "github.com/milvus-io/milvus/internal/kv/etcd"
"github.com/milvus-io/milvus/internal/kv/tikv"
"github.com/milvus-io/milvus/internal/metastore"
"github.com/milvus-io/milvus/internal/metastore/kv/querycoord"
"github.com/milvus-io/milvus/internal/proto/internalpb"
"github.com/milvus-io/milvus/internal/querycoordv2/balance"
"github.com/milvus-io/milvus/internal/querycoordv2/checkers"
"github.com/milvus-io/milvus/internal/querycoordv2/dist"
"github.com/milvus-io/milvus/internal/querycoordv2/job"
"github.com/milvus-io/milvus/internal/querycoordv2/meta"
"github.com/milvus-io/milvus/internal/querycoordv2/observers"
"github.com/milvus-io/milvus/internal/querycoordv2/params"
"github.com/milvus-io/milvus/internal/querycoordv2/session"
"github.com/milvus-io/milvus/internal/querycoordv2/task"
"github.com/milvus-io/milvus/internal/types"
"github.com/milvus-io/milvus/internal/util/proxyutil"
"github.com/milvus-io/milvus/internal/util/sessionutil"
"github.com/milvus-io/milvus/internal/util/tsoutil"
"github.com/milvus-io/milvus/pkg/common"
"github.com/milvus-io/milvus/pkg/log"
"github.com/milvus-io/milvus/pkg/metrics"
"github.com/milvus-io/milvus/pkg/util"
"github.com/milvus-io/milvus/pkg/util/expr"
"github.com/milvus-io/milvus/pkg/util/merr"
"github.com/milvus-io/milvus/pkg/util/metricsinfo"
"github.com/milvus-io/milvus/pkg/util/paramtable"
"github.com/milvus-io/milvus/pkg/util/timerecord"
"github.com/milvus-io/milvus/pkg/util/typeutil"
)
// Only for re-export
var Params = params.Params
type Server struct {
ctx context.Context
cancel context.CancelFunc
wg sync.WaitGroup
status atomic.Int32
etcdCli *clientv3.Client
tikvCli *txnkv.Client
address string
session sessionutil.SessionInterface
kv kv.MetaKv
idAllocator func() (int64, error)
metricsCacheManager *metricsinfo.MetricsCacheManager
// Coordinators
dataCoord types.DataCoordClient
rootCoord types.RootCoordClient
// Meta
store metastore.QueryCoordCatalog
meta *meta.Meta
dist *meta.DistributionManager
targetMgr *meta.TargetManager
broker meta.Broker
// Session
cluster session.Cluster
nodeMgr *session.NodeManager
queryNodeCreator session.QueryNodeCreator
// Schedulers
jobScheduler *job.Scheduler
taskScheduler task.Scheduler
// HeartBeat
distController dist.Controller
// Checkers
checkerController *checkers.CheckerController
// Observers
collectionObserver *observers.CollectionObserver
targetObserver *observers.TargetObserver
replicaObserver *observers.ReplicaObserver
resourceObserver *observers.ResourceObserver
leaderCacheObserver *observers.LeaderCacheObserver
balancer balance.Balance
// Active-standby
enableActiveStandBy bool
activateFunc func() error
nodeUpEventChan chan int64
notifyNodeUp chan struct{}
// proxy client manager
proxyCreator proxyutil.ProxyCreator
proxyWatcher proxyutil.ProxyWatcherInterface
proxyClientManager proxyutil.ProxyClientManagerInterface
}
func NewQueryCoord(ctx context.Context) (*Server, error) {
ctx, cancel := context.WithCancel(ctx)
server := &Server{
ctx: ctx,
cancel: cancel,
nodeUpEventChan: make(chan int64, 10240),
notifyNodeUp: make(chan struct{}),
}
server.UpdateStateCode(commonpb.StateCode_Abnormal)
server.queryNodeCreator = session.DefaultQueryNodeCreator
expr.Register("querycoord", server)
return server, nil
}
func (s *Server) Register() error {
s.session.Register()
afterRegister := func() {
metrics.NumNodes.WithLabelValues(fmt.Sprint(paramtable.GetNodeID()), typeutil.QueryCoordRole).Inc()
s.session.LivenessCheck(s.ctx, func() {
log.Error("QueryCoord disconnected from etcd, process will exit", zap.Int64("serverID", s.session.GetServerID()))
os.Exit(1)
})
}
if s.enableActiveStandBy {
go func() {
if err := s.session.ProcessActiveStandBy(s.activateFunc); err != nil {
log.Error("failed to activate standby server", zap.Error(err))
return
}
afterRegister()
}()
} else {
afterRegister()
}
return nil
}
func (s *Server) initSession() error {
// Init QueryCoord session
s.session = sessionutil.NewSession(s.ctx)
if s.session == nil {
return fmt.Errorf("failed to create session")
}
s.session.Init(typeutil.QueryCoordRole, s.address, true, true)
s.enableActiveStandBy = Params.QueryCoordCfg.EnableActiveStandby.GetAsBool()
s.session.SetEnableActiveStandBy(s.enableActiveStandBy)
return nil
}
func (s *Server) Init() error {
log.Info("QueryCoord start init",
zap.String("meta-root-path", Params.EtcdCfg.MetaRootPath.GetValue()),
zap.String("address", s.address))
if err := s.initSession(); err != nil {
return err
}
if s.enableActiveStandBy {
s.activateFunc = func() error {
log.Info("QueryCoord switch from standby to active, activating")
if err := s.initQueryCoord(); err != nil {
log.Error("QueryCoord init failed", zap.Error(err))
return err
}
if err := s.startQueryCoord(); err != nil {
log.Error("QueryCoord init failed", zap.Error(err))
return err
}
log.Info("QueryCoord startup success")
return nil
}
s.UpdateStateCode(commonpb.StateCode_StandBy)
log.Info("QueryCoord enter standby mode successfully")
return nil
}
return s.initQueryCoord()
}
func (s *Server) initQueryCoord() error {
s.UpdateStateCode(commonpb.StateCode_Initializing)
log.Info("start init querycoord", zap.Any("State", commonpb.StateCode_Initializing))
// Init KV and ID allocator
metaType := Params.MetaStoreCfg.MetaStoreType.GetValue()
var idAllocatorKV kv.TxnKV
log.Info(fmt.Sprintf("query coordinator connecting to %s.", metaType))
if metaType == util.MetaStoreTypeTiKV {
s.kv = tikv.NewTiKV(s.tikvCli, Params.TiKVCfg.MetaRootPath.GetValue(),
tikv.WithRequestTimeout(paramtable.Get().ServiceParam.TiKVCfg.RequestTimeout.GetAsDuration(time.Millisecond)))
idAllocatorKV = tsoutil.NewTSOTiKVBase(s.tikvCli, Params.TiKVCfg.KvRootPath.GetValue(), "querycoord-id-allocator")
} else if metaType == util.MetaStoreTypeEtcd {
s.kv = etcdkv.NewEtcdKV(s.etcdCli, Params.EtcdCfg.MetaRootPath.GetValue(),
etcdkv.WithRequestTimeout(paramtable.Get().ServiceParam.EtcdCfg.RequestTimeout.GetAsDuration(time.Millisecond)))
idAllocatorKV = tsoutil.NewTSOKVBase(s.etcdCli, Params.EtcdCfg.KvRootPath.GetValue(), "querycoord-id-allocator")
} else {
return fmt.Errorf("not supported meta store: %s", metaType)
}
log.Info(fmt.Sprintf("query coordinator successfully connected to %s.", metaType))
idAllocator := allocator.NewGlobalIDAllocator("idTimestamp", idAllocatorKV)
err := idAllocator.Initialize()
if err != nil {
log.Error("query coordinator id allocator initialize failed", zap.Error(err))
return err
}
s.idAllocator = func() (int64, error) {
return idAllocator.AllocOne()
}
log.Info("init ID allocator done")
// Init metrics cache manager
s.metricsCacheManager = metricsinfo.NewMetricsCacheManager()
// Init meta
s.nodeMgr = session.NewNodeManager()
err = s.initMeta()
if err != nil {
return err
}
// Init session
log.Info("init session")
s.cluster = session.NewCluster(s.nodeMgr, s.queryNodeCreator)
// Init schedulers
log.Info("init schedulers")
s.jobScheduler = job.NewScheduler()
s.taskScheduler = task.NewScheduler(
s.ctx,
s.meta,
s.dist,
s.targetMgr,
s.broker,
s.cluster,
s.nodeMgr,
)
// init proxy client manager
s.proxyClientManager = proxyutil.NewProxyClientManager(proxyutil.DefaultProxyCreator)
s.proxyWatcher = proxyutil.NewProxyWatcher(
s.etcdCli,
s.proxyClientManager.AddProxyClients,
)
s.proxyWatcher.AddSessionFunc(s.proxyClientManager.AddProxyClient)
s.proxyWatcher.DelSessionFunc(s.proxyClientManager.DelProxyClient)
log.Info("init proxy manager done")
// Init heartbeat
log.Info("init dist controller")
s.distController = dist.NewDistController(
s.cluster,
s.nodeMgr,
s.dist,
s.targetMgr,
s.taskScheduler,
)
// Init balancer map and balancer
log.Info("init balancer")
switch params.Params.QueryCoordCfg.Balancer.GetValue() {
case meta.RoundRobinBalancerName:
s.balancer = balance.NewRoundRobinBalancer(s.taskScheduler, s.nodeMgr)
case meta.RowCountBasedBalancerName:
s.balancer = balance.NewRowCountBasedBalancer(s.taskScheduler, s.nodeMgr, s.dist, s.meta, s.targetMgr)
case meta.ScoreBasedBalancerName:
s.balancer = balance.NewScoreBasedBalancer(s.taskScheduler, s.nodeMgr, s.dist, s.meta, s.targetMgr)
case meta.MultiTargetBalancerName:
s.balancer = balance.NewMultiTargetBalancer(s.taskScheduler, s.nodeMgr, s.dist, s.meta, s.targetMgr)
case meta.ChannelLevelScoreBalancerName:
s.balancer = balance.NewChannelLevelScoreBalancer(s.taskScheduler, s.nodeMgr, s.dist, s.meta, s.targetMgr)
default:
log.Info(fmt.Sprintf("default to use %s", meta.ScoreBasedBalancerName))
s.balancer = balance.NewScoreBasedBalancer(s.taskScheduler, s.nodeMgr, s.dist, s.meta, s.targetMgr)
}
// Init checker controller
log.Info("init checker controller")
s.checkerController = checkers.NewCheckerController(
s.meta,
s.dist,
s.targetMgr,
s.balancer,
s.nodeMgr,
s.taskScheduler,
s.broker,
)
// Init observers
s.initObserver()
// Init load status cache
meta.GlobalFailedLoadCache = meta.NewFailedLoadCache()
log.Info("init querycoord done", zap.Int64("nodeID", paramtable.GetNodeID()), zap.String("Address", s.address))
return err
}
func (s *Server) initMeta() error {
record := timerecord.NewTimeRecorder("querycoord")
log.Info("init meta")
s.store = querycoord.NewCatalog(s.kv)
s.meta = meta.NewMeta(s.idAllocator, s.store, s.nodeMgr)
s.broker = meta.NewCoordinatorBroker(
s.dataCoord,
s.rootCoord,
)
log.Info("recover meta...")
err := s.meta.CollectionManager.Recover(s.broker)
if err != nil {
log.Warn("failed to recover collections", zap.Error(err))
return err
}
collections := s.meta.GetAll()
log.Info("recovering collections...", zap.Int64s("collections", collections))
// We really update the metric after observers think the collection loaded.
metrics.QueryCoordNumCollections.WithLabelValues().Set(0)
metrics.QueryCoordNumPartitions.WithLabelValues().Set(float64(len(s.meta.GetAllPartitions())))
err = s.meta.ReplicaManager.Recover(collections)
if err != nil {
log.Warn("failed to recover replicas", zap.Error(err))
return err
}
err = s.meta.ResourceManager.Recover()
if err != nil {
log.Warn("failed to recover resource groups", zap.Error(err))
return err
}
s.dist = &meta.DistributionManager{
SegmentDistManager: meta.NewSegmentDistManager(),
ChannelDistManager: meta.NewChannelDistManager(),
LeaderViewManager: meta.NewLeaderViewManager(),
}
s.targetMgr = meta.NewTargetManager(s.broker, s.meta)
err = s.targetMgr.Recover(s.store)
if err != nil {
log.Warn("failed to recover collection targets", zap.Error(err))
}
log.Info("QueryCoord server initMeta done", zap.Duration("duration", record.ElapseSpan()))
return nil
}
func (s *Server) initObserver() {
log.Info("init observers")
s.targetObserver = observers.NewTargetObserver(
s.meta,
s.targetMgr,
s.dist,
s.broker,
s.cluster,
)
s.collectionObserver = observers.NewCollectionObserver(
s.dist,
s.meta,
s.targetMgr,
s.targetObserver,
s.checkerController,
)
s.replicaObserver = observers.NewReplicaObserver(
s.meta,
s.dist,
)
s.resourceObserver = observers.NewResourceObserver(s.meta)
s.leaderCacheObserver = observers.NewLeaderCacheObserver(
s.proxyClientManager,
)
s.dist.LeaderViewManager.SetNotifyFunc(s.leaderCacheObserver.RegisterEvent)
}
func (s *Server) afterStart() {}
func (s *Server) Start() error {
if !s.enableActiveStandBy {
if err := s.startQueryCoord(); err != nil {
return err
}
log.Info("QueryCoord started")
}
return nil
}
func (s *Server) startQueryCoord() error {
log.Info("start watcher...")
sessions, revision, err := s.session.GetSessions(typeutil.QueryNodeRole)
if err != nil {
return err
}
for _, node := range sessions {
s.nodeMgr.Add(session.NewNodeInfo(session.ImmutableNodeInfo{
NodeID: node.ServerID,
Address: node.Address,
Hostname: node.HostName,
Version: node.Version,
}))
s.taskScheduler.AddExecutor(node.ServerID)
if node.Stopping {
s.nodeMgr.Stopping(node.ServerID)
}
}
for _, node := range sessions {
s.handleNodeUp(node.ServerID)
}
s.wg.Add(2)
go s.handleNodeUpLoop()
go s.watchNodes(revision)
// check whether old node exist, if yes suspend auto balance until all old nodes down
s.updateBalanceConfigLoop(s.ctx)
if err := s.proxyWatcher.WatchProxy(s.ctx); err != nil {
log.Warn("querycoord failed to watch proxy", zap.Error(err))
}
s.startServerLoop()
s.afterStart()
s.UpdateStateCode(commonpb.StateCode_Healthy)
sessionutil.SaveServerInfo(typeutil.QueryCoordRole, s.session.GetServerID())
return nil
}
func (s *Server) startServerLoop() {
// leader cache observer shall be started before `SyncAll` call
s.leaderCacheObserver.Start(s.ctx)
// Recover dist, to avoid generate too much task when dist not ready after restart
s.distController.SyncAll(s.ctx)
// start the components from inside to outside,
// to make the dependencies ready for every component
log.Info("start cluster...")
s.cluster.Start()
log.Info("start observers...")
s.collectionObserver.Start()
s.targetObserver.Start()
s.replicaObserver.Start()
s.resourceObserver.Start()
log.Info("start task scheduler...")
s.taskScheduler.Start()
log.Info("start checker controller...")
s.checkerController.Start()
log.Info("start job scheduler...")
s.jobScheduler.Start()
}
func (s *Server) Stop() error {
// FOLLOW the dependence graph:
// job scheduler -> checker controller -> task scheduler -> dist controller -> cluster -> session
// observers -> dist controller
if s.jobScheduler != nil {
log.Info("stop job scheduler...")
s.jobScheduler.Stop()
}
if s.checkerController != nil {
log.Info("stop checker controller...")
s.checkerController.Stop()
}
if s.taskScheduler != nil {
log.Info("stop task scheduler...")
s.taskScheduler.Stop()
}
log.Info("stop observers...")
if s.collectionObserver != nil {
s.collectionObserver.Stop()
}
if s.targetObserver != nil {
s.targetObserver.Stop()
}
// save target to meta store, after querycoord restart, make it fast to recover current target
// should save target after target observer stop, incase of target changed
if s.targetMgr != nil {
s.targetMgr.SaveCurrentTarget(s.store)
}
if s.replicaObserver != nil {
s.replicaObserver.Stop()
}
if s.resourceObserver != nil {
s.resourceObserver.Stop()
}
if s.leaderCacheObserver != nil {
s.leaderCacheObserver.Stop()
}
if s.distController != nil {
log.Info("stop dist controller...")
s.distController.Stop()
}
if s.cluster != nil {
log.Info("stop cluster...")
s.cluster.Stop()
}
if s.session != nil {
s.session.Stop()
}
s.cancel()
s.wg.Wait()
log.Info("QueryCoord stop successfully")
return nil
}
// UpdateStateCode updates the status of the coord, including healthy, unhealthy
func (s *Server) UpdateStateCode(code commonpb.StateCode) {
s.status.Store(int32(code))
}
func (s *Server) State() commonpb.StateCode {
return commonpb.StateCode(s.status.Load())
}
func (s *Server) GetComponentStates(ctx context.Context, req *milvuspb.GetComponentStatesRequest) (*milvuspb.ComponentStates, error) {
log.Debug("QueryCoord current state", zap.String("StateCode", s.State().String()))
nodeID := common.NotRegisteredID
if s.session != nil && s.session.Registered() {
nodeID = s.session.GetServerID()
}
serviceComponentInfo := &milvuspb.ComponentInfo{
// NodeID: Params.QueryCoordID, // will race with QueryCoord.Register()
NodeID: nodeID,
StateCode: s.State(),
}
return &milvuspb.ComponentStates{
Status: merr.Success(),
State: serviceComponentInfo,
// SubcomponentStates: subComponentInfos,
}, nil
}
func (s *Server) GetStatisticsChannel(ctx context.Context, req *internalpb.GetStatisticsChannelRequest) (*milvuspb.StringResponse, error) {
return &milvuspb.StringResponse{
Status: merr.Success(),
}, nil
}
func (s *Server) GetTimeTickChannel(ctx context.Context, req *internalpb.GetTimeTickChannelRequest) (*milvuspb.StringResponse, error) {
return &milvuspb.StringResponse{
Status: merr.Success(),
Value: Params.CommonCfg.QueryCoordTimeTick.GetValue(),
}, nil
}
func (s *Server) SetAddress(address string) {
s.address = address
}
// SetEtcdClient sets etcd's client
func (s *Server) SetEtcdClient(etcdClient *clientv3.Client) {
s.etcdCli = etcdClient
}
func (s *Server) SetTiKVClient(client *txnkv.Client) {
s.tikvCli = client
}
// SetRootCoord sets root coordinator's client
func (s *Server) SetRootCoordClient(rootCoord types.RootCoordClient) error {
if rootCoord == nil {
return errors.New("null RootCoord interface")
}
s.rootCoord = rootCoord
return nil
}
// SetDataCoord sets data coordinator's client
func (s *Server) SetDataCoordClient(dataCoord types.DataCoordClient) error {
if dataCoord == nil {
return errors.New("null DataCoord interface")
}
s.dataCoord = dataCoord
return nil
}
func (s *Server) SetQueryNodeCreator(f func(ctx context.Context, addr string, nodeID int64) (types.QueryNodeClient, error)) {
s.queryNodeCreator = f
}
func (s *Server) watchNodes(revision int64) {
defer s.wg.Done()
eventChan := s.session.WatchServices(typeutil.QueryNodeRole, revision+1, nil)
for {
select {
case <-s.ctx.Done():
log.Info("stop watching nodes, QueryCoord stopped")
return
case event, ok := <-eventChan:
if !ok {
// ErrCompacted is handled inside SessionWatcher
log.Warn("Session Watcher channel closed", zap.Int64("serverID", paramtable.GetNodeID()))
go s.Stop()
if s.session.IsTriggerKill() {
if p, err := os.FindProcess(os.Getpid()); err == nil {
p.Signal(syscall.SIGINT)
}
}
return
}
switch event.EventType {
case sessionutil.SessionAddEvent:
nodeID := event.Session.ServerID
addr := event.Session.Address
log.Info("add node to NodeManager",
zap.Int64("nodeID", nodeID),
zap.String("nodeAddr", addr),
)
s.nodeMgr.Add(session.NewNodeInfo(session.ImmutableNodeInfo{
NodeID: nodeID,
Address: addr,
Hostname: event.Session.HostName,
Version: event.Session.Version,
}))
s.nodeUpEventChan <- nodeID
select {
case s.notifyNodeUp <- struct{}{}:
default:
}
case sessionutil.SessionUpdateEvent:
nodeID := event.Session.ServerID
addr := event.Session.Address
log.Info("stopping the node",
zap.Int64("nodeID", nodeID),
zap.String("nodeAddr", addr),
)
s.nodeMgr.Stopping(nodeID)
s.checkerController.Check()
s.meta.ResourceManager.HandleNodeStopping(nodeID)
case sessionutil.SessionDelEvent:
nodeID := event.Session.ServerID
log.Info("a node down, remove it", zap.Int64("nodeID", nodeID))
s.nodeMgr.Remove(nodeID)
s.handleNodeDown(nodeID)
s.metricsCacheManager.InvalidateSystemInfoMetrics()
}
}
}
}
func (s *Server) handleNodeUpLoop() {
defer s.wg.Done()
ticker := time.NewTicker(Params.QueryCoordCfg.CheckHealthInterval.GetAsDuration(time.Millisecond))
defer ticker.Stop()
for {
select {
case <-s.ctx.Done():
log.Info("handle node up loop exit due to context done")
return
case <-s.notifyNodeUp:
s.tryHandleNodeUp()
case <-ticker.C:
s.tryHandleNodeUp()
}
}
}
func (s *Server) tryHandleNodeUp() {
log := log.Ctx(s.ctx).WithRateGroup("qcv2.Server", 1, 60)
ctx, cancel := context.WithTimeout(s.ctx, Params.QueryCoordCfg.CheckHealthRPCTimeout.GetAsDuration(time.Millisecond))
defer cancel()
reasons, err := s.checkNodeHealth(ctx)
if err != nil {
log.RatedWarn(10, "unhealthy node exist, node up will be delayed",
zap.Int("delayedNodeUpEvents", len(s.nodeUpEventChan)),
zap.Int("unhealthyNodeNum", len(reasons)),
zap.Strings("unhealthyReason", reasons))
return
}
for len(s.nodeUpEventChan) > 0 {
nodeID := <-s.nodeUpEventChan
if s.nodeMgr.Get(nodeID) != nil {
// only if all nodes are healthy, node up event will be handled
s.handleNodeUp(nodeID)
s.metricsCacheManager.InvalidateSystemInfoMetrics()
s.checkerController.Check()
} else {
log.Warn("node already down",
zap.Int64("nodeID", nodeID))
}
}
}
func (s *Server) handleNodeUp(node int64) {
s.taskScheduler.AddExecutor(node)
s.distController.StartDistInstance(s.ctx, node)
// need assign to new rg and replica
s.meta.ResourceManager.HandleNodeUp(node)
}
func (s *Server) handleNodeDown(node int64) {
s.taskScheduler.RemoveExecutor(node)
s.distController.Remove(node)
// Clear dist
s.dist.LeaderViewManager.Update(node)
s.dist.ChannelDistManager.Update(node)
s.dist.SegmentDistManager.Update(node)
// Clear tasks
s.taskScheduler.RemoveByNode(node)
s.meta.ResourceManager.HandleNodeDown(node)
}
func (s *Server) updateBalanceConfigLoop(ctx context.Context) {
success := s.updateBalanceConfig()
if success {
return
}
s.wg.Add(1)
go func() {
defer s.wg.Done()
ticker := time.NewTicker(Params.QueryCoordCfg.CheckAutoBalanceConfigInterval.GetAsDuration(time.Second))
defer ticker.Stop()
for {
select {
case <-ctx.Done():
log.Info("update balance config loop exit!")
return
case <-ticker.C:
success := s.updateBalanceConfig()
if success {
return
}
}
}
}()
}
func (s *Server) updateBalanceConfig() bool {
log := log.Ctx(s.ctx).WithRateGroup("qcv2.updateBalanceConfigLoop", 1, 60)
r := semver.MustParseRange("<2.3.0")
sessions, _, err := s.session.GetSessionsWithVersionRange(typeutil.QueryNodeRole, r)
if err != nil {
log.Warn("check query node version occur error on etcd", zap.Error(err))
return false
}
if len(sessions) == 0 {
// only balance channel when all query node's version >= 2.3.0
Params.Reset(Params.QueryCoordCfg.AutoBalance.Key)
log.Info("all old query node down, enable auto balance!")
return true
}
Params.Save(Params.QueryCoordCfg.AutoBalance.Key, "false")
log.RatedDebug(10, "old query node exist", zap.Strings("sessions", lo.Keys(sessions)))
return false
}