mirror of
https://gitee.com/milvus-io/milvus.git
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344 lines
10 KiB
Go
344 lines
10 KiB
Go
// Copyright (C) 2019-2020 Zilliz. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software distributed under the License
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// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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// or implied. See the License for the specific language governing permissions and limitations under the License.
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package querycoord
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import (
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"context"
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"errors"
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"math/rand"
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"path/filepath"
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"strconv"
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"sync"
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"sync/atomic"
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"time"
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"github.com/golang/protobuf/proto"
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"go.etcd.io/etcd/api/v3/mvccpb"
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"go.uber.org/zap"
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etcdkv "github.com/milvus-io/milvus/internal/kv/etcd"
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"github.com/milvus-io/milvus/internal/log"
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"github.com/milvus-io/milvus/internal/msgstream"
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"github.com/milvus-io/milvus/internal/proto/commonpb"
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"github.com/milvus-io/milvus/internal/proto/internalpb"
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"github.com/milvus-io/milvus/internal/proto/querypb"
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"github.com/milvus-io/milvus/internal/types"
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"github.com/milvus-io/milvus/internal/util/metricsinfo"
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"github.com/milvus-io/milvus/internal/util/retry"
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"github.com/milvus-io/milvus/internal/util/sessionutil"
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"github.com/milvus-io/milvus/internal/util/typeutil"
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)
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// Timestamp is an alias for the Int64 type
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type Timestamp = typeutil.Timestamp
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type queryChannelInfo struct {
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requestChannel string
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responseChannel string
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}
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// QueryCoord is the coordinator of queryNodes
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type QueryCoord struct {
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loopCtx context.Context
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loopCancel context.CancelFunc
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loopWg sync.WaitGroup
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kvClient *etcdkv.EtcdKV
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initOnce sync.Once
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queryCoordID uint64
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meta Meta
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cluster Cluster
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newNodeFn newQueryNodeFn
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scheduler *TaskScheduler
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metricsCacheManager *metricsinfo.MetricsCacheManager
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dataCoordClient types.DataCoord
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rootCoordClient types.RootCoord
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session *sessionutil.Session
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liveCh <-chan bool
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eventChan <-chan *sessionutil.SessionEvent
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stateCode atomic.Value
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enableGrpc bool
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msFactory msgstream.Factory
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}
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// Register register query service at etcd
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func (qc *QueryCoord) Register() error {
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log.Debug("query coord session info", zap.String("metaPath", Params.MetaRootPath), zap.Strings("etcdEndPoints", Params.EtcdEndpoints), zap.String("address", Params.Address))
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qc.session = sessionutil.NewSession(qc.loopCtx, Params.MetaRootPath, Params.EtcdEndpoints)
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qc.liveCh = qc.session.Init(typeutil.QueryCoordRole, Params.Address, true)
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Params.NodeID = uint64(qc.session.ServerID)
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Params.SetLogger(typeutil.UniqueID(-1))
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return nil
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}
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// Init function initializes the queryCoord's meta, cluster, etcdKV and task scheduler
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func (qc *QueryCoord) Init() error {
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log.Debug("query coordinator start init")
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//connect etcd
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connectEtcdFn := func() error {
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etcdKV, err := etcdkv.NewEtcdKV(Params.EtcdEndpoints, Params.MetaRootPath)
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if err != nil {
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return err
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}
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qc.kvClient = etcdKV
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return nil
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}
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var initError error = nil
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qc.initOnce.Do(func() {
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log.Debug("query coordinator try to connect etcd")
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initError = retry.Do(qc.loopCtx, connectEtcdFn, retry.Attempts(300))
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if initError != nil {
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log.Debug("query coordinator try to connect etcd failed", zap.Error(initError))
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return
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}
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log.Debug("query coordinator try to connect etcd success")
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qc.meta, initError = newMeta(qc.kvClient)
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if initError != nil {
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log.Error("query coordinator init meta failed", zap.Error(initError))
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return
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}
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qc.cluster, initError = newQueryNodeCluster(qc.loopCtx, qc.meta, qc.kvClient, qc.newNodeFn, qc.session)
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if initError != nil {
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log.Error("query coordinator init cluster failed", zap.Error(initError))
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return
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}
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qc.scheduler, initError = NewTaskScheduler(qc.loopCtx, qc.meta, qc.cluster, qc.kvClient, qc.rootCoordClient, qc.dataCoordClient)
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if initError != nil {
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log.Error("query coordinator init task scheduler failed", zap.Error(initError))
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return
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}
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qc.metricsCacheManager = metricsinfo.NewMetricsCacheManager()
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})
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return initError
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}
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// Start function starts the goroutines to watch the meta and node updates
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func (qc *QueryCoord) Start() error {
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qc.scheduler.Start()
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log.Debug("start scheduler ...")
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Params.CreatedTime = time.Now()
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Params.UpdatedTime = time.Now()
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qc.UpdateStateCode(internalpb.StateCode_Healthy)
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qc.loopWg.Add(1)
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go qc.watchNodeLoop()
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qc.loopWg.Add(1)
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go qc.watchMetaLoop()
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go qc.session.LivenessCheck(qc.loopCtx, qc.liveCh, func() {
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qc.Stop()
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})
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return nil
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}
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// Stop function stops watching the meta and node updates
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func (qc *QueryCoord) Stop() error {
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qc.scheduler.Close()
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log.Debug("close scheduler ...")
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qc.loopCancel()
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qc.UpdateStateCode(internalpb.StateCode_Abnormal)
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qc.loopWg.Wait()
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return nil
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}
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// UpdateStateCode updates the status of the coord, including healthy, unhealthy
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func (qc *QueryCoord) UpdateStateCode(code internalpb.StateCode) {
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qc.stateCode.Store(code)
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}
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// NewQueryCoord creates a QueryCoord object.
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func NewQueryCoord(ctx context.Context, factory msgstream.Factory) (*QueryCoord, error) {
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rand.Seed(time.Now().UnixNano())
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queryChannels := make([]*queryChannelInfo, 0)
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channelID := len(queryChannels)
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searchPrefix := Params.SearchChannelPrefix
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searchResultPrefix := Params.SearchResultChannelPrefix
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allocatedQueryChannel := searchPrefix + "-" + strconv.FormatInt(int64(channelID), 10)
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allocatedQueryResultChannel := searchResultPrefix + "-" + strconv.FormatInt(int64(channelID), 10)
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queryChannels = append(queryChannels, &queryChannelInfo{
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requestChannel: allocatedQueryChannel,
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responseChannel: allocatedQueryResultChannel,
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})
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ctx1, cancel := context.WithCancel(ctx)
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service := &QueryCoord{
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loopCtx: ctx1,
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loopCancel: cancel,
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msFactory: factory,
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newNodeFn: newQueryNode,
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}
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service.UpdateStateCode(internalpb.StateCode_Abnormal)
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log.Debug("query coordinator", zap.Any("queryChannels", queryChannels))
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return service, nil
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}
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// SetRootCoord sets root coordinator's client
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func (qc *QueryCoord) SetRootCoord(rootCoord types.RootCoord) error {
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if rootCoord == nil {
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return errors.New("null root coordinator interface")
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}
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qc.rootCoordClient = rootCoord
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return nil
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}
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// SetDataCoord sets data coordinator's client
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func (qc *QueryCoord) SetDataCoord(dataCoord types.DataCoord) error {
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if dataCoord == nil {
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return errors.New("null data coordinator interface")
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}
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qc.dataCoordClient = dataCoord
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return nil
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}
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func (qc *QueryCoord) watchNodeLoop() {
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ctx, cancel := context.WithCancel(qc.loopCtx)
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defer cancel()
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defer qc.loopWg.Done()
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log.Debug("query coordinator start watch node loop")
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offlineNodes, err := qc.cluster.offlineNodes()
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if err == nil {
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offlineNodeIDs := make([]int64, 0)
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for id := range offlineNodes {
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offlineNodeIDs = append(offlineNodeIDs, id)
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}
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loadBalanceSegment := &querypb.LoadBalanceRequest{
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Base: &commonpb.MsgBase{
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MsgType: commonpb.MsgType_LoadBalanceSegments,
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SourceID: qc.session.ServerID,
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},
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SourceNodeIDs: offlineNodeIDs,
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}
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baseTask := newBaseTask(qc.loopCtx, querypb.TriggerCondition_nodeDown)
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loadBalanceTask := &LoadBalanceTask{
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BaseTask: baseTask,
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LoadBalanceRequest: loadBalanceSegment,
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rootCoord: qc.rootCoordClient,
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dataCoord: qc.dataCoordClient,
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cluster: qc.cluster,
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meta: qc.meta,
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}
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//TODO::deal enqueue error
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qc.scheduler.Enqueue(loadBalanceTask)
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log.Debug("start a loadBalance task", zap.Any("task", loadBalanceTask))
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}
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qc.eventChan = qc.session.WatchServices(typeutil.QueryNodeRole, qc.cluster.getSessionVersion()+1)
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for {
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select {
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case <-ctx.Done():
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return
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case event := <-qc.eventChan:
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switch event.EventType {
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case sessionutil.SessionAddEvent:
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serverID := event.Session.ServerID
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log.Debug("start add a queryNode to cluster", zap.Any("nodeID", serverID))
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err := qc.cluster.registerNode(ctx, event.Session, serverID, disConnect)
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if err != nil {
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log.Error("query node failed to register", zap.Int64("nodeID", serverID), zap.String("error info", err.Error()))
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}
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qc.metricsCacheManager.InvalidateSystemInfoMetrics()
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case sessionutil.SessionDelEvent:
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serverID := event.Session.ServerID
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log.Debug("get a del event after queryNode down", zap.Int64("nodeID", serverID))
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_, err := qc.cluster.getNodeByID(serverID)
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if err != nil {
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log.Error("queryNode not exist", zap.Int64("nodeID", serverID))
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continue
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}
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qc.cluster.stopNode(serverID)
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loadBalanceSegment := &querypb.LoadBalanceRequest{
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Base: &commonpb.MsgBase{
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MsgType: commonpb.MsgType_LoadBalanceSegments,
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SourceID: qc.session.ServerID,
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},
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SourceNodeIDs: []int64{serverID},
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BalanceReason: querypb.TriggerCondition_nodeDown,
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}
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baseTask := newBaseTask(qc.loopCtx, querypb.TriggerCondition_nodeDown)
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loadBalanceTask := &LoadBalanceTask{
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BaseTask: baseTask,
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LoadBalanceRequest: loadBalanceSegment,
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rootCoord: qc.rootCoordClient,
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dataCoord: qc.dataCoordClient,
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cluster: qc.cluster,
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meta: qc.meta,
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}
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qc.metricsCacheManager.InvalidateSystemInfoMetrics()
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//TODO:: deal enqueue error
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qc.scheduler.Enqueue(loadBalanceTask)
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log.Debug("start a loadBalance task", zap.Any("task", loadBalanceTask))
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}
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}
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}
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}
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func (qc *QueryCoord) watchMetaLoop() {
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ctx, cancel := context.WithCancel(qc.loopCtx)
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defer cancel()
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defer qc.loopWg.Done()
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log.Debug("query coordinator start watch MetaReplica loop")
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watchChan := qc.kvClient.WatchWithPrefix("queryNode-segmentMeta")
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for {
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select {
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case <-ctx.Done():
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return
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case resp := <-watchChan:
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log.Debug("segment MetaReplica updated.")
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for _, event := range resp.Events {
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segmentID, err := strconv.ParseInt(filepath.Base(string(event.Kv.Key)), 10, 64)
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if err != nil {
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log.Error("watch MetaReplica loop error when get segmentID", zap.Any("error", err.Error()))
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}
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segmentInfo := &querypb.SegmentInfo{}
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err = proto.Unmarshal(event.Kv.Value, segmentInfo)
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if err != nil {
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log.Error("watch MetaReplica loop error when unmarshal", zap.Any("error", err.Error()))
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}
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switch event.Type {
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case mvccpb.PUT:
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//TODO::
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qc.meta.setSegmentInfo(segmentID, segmentInfo)
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case mvccpb.DELETE:
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//TODO::
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}
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}
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}
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}
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}
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