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apply.go
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apply.go
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// Copyright 2016 The etcd Authors. All rights reserved.
// Use of this source code is governed by a Apache License(Version 2.0)
// that can be found in the LICENSES/etcd-LICENSE file.
// Copyright 2018 The kingbus 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 (
"encoding/json"
"fmt"
"path"
"github.com/flike/kingbus/storage/storagepb"
uuid "github.com/satori/go.uuid"
"github.com/flike/kingbus/config"
"github.com/flike/kingbus/utils"
"time"
"github.com/coreos/etcd/pkg/pbutil"
"github.com/coreos/etcd/pkg/types"
etcdraft "github.com/coreos/etcd/raft"
"github.com/coreos/etcd/raft/raftpb"
"github.com/flike/kingbus/log"
"github.com/flike/kingbus/mysql"
"github.com/flike/kingbus/raft"
"github.com/flike/kingbus/raft/membership"
"github.com/flike/kingbus/storage"
gomysql "github.com/siddontang/go-mysql/mysql"
"github.com/siddontang/go-mysql/replication"
)
const (
warnApplyDuration = 100 * time.Millisecond
)
func (s *KingbusServer) applyAll(ap *raft.ApplyEntry) {
if len(ap.Entries) == 0 {
ap.Notifyc <- struct{}{}
return
}
s.applyEntries(ap)
ap.Notifyc <- struct{}{}
}
func (s *KingbusServer) applyEntries(ap *raft.ApplyEntry) {
if len(ap.Entries) == 0 {
return
}
firstIndex := ap.Entries[0].Index
appliedIndex := s.raftNode.GetAppliedIndex()
if firstIndex > appliedIndex+1 {
log.Log.Panicf("first index of committed entry[%d] should <= appliedIndex[%d] + 1", firstIndex, appliedIndex)
}
var ents []raftpb.Entry
//raft index to slice index
if appliedIndex+1-firstIndex < uint64(len(ap.Entries)) {
ents = ap.Entries[appliedIndex+1-firstIndex:]
}
if len(ents) == 0 {
return
}
var shouldstop bool
if shouldstop = s.apply(ents); shouldstop {
log.Log.Infof("the member has been permanently removed from the cluster")
go s.Stop()
}
}
type confChangeResponse struct {
membs []*membership.Member
err error
}
// apply takes entries received from Raft (after it has been committed) and
// applies them to the current state of the EtcdServer.
// The given entries should not be empty.
func (s *KingbusServer) apply(es []raftpb.Entry) bool {
var shouldStop bool
for i := range es {
e := es[i]
switch e.Type {
case raftpb.EntryNormal:
s.applyEntryNormal(&e)
s.raftNode.SetAppliedIndex(e.Index)
s.raftNode.SetTerm(e.Term)
case raftpb.EntryConfChange:
var cc raftpb.ConfChange
pbutil.MustUnmarshal(&cc, e.Data)
removedSelf, err := s.applyConfChange(cc)
s.raftNode.SetAppliedIndex(e.Index)
s.raftNode.SetTerm(e.Term)
shouldStop = shouldStop || removedSelf
s.wait.Trigger(cc.ID, &confChangeResponse{s.cluster.Members(), err})
default:
log.Log.Panicf("entry type should be either EntryNormal or EntryConfChange")
}
}
return shouldStop
}
// applyEntryNormal apples an EntryNormal type raftpb request to the EtcdServer
func (s *KingbusServer) applyEntryNormal(e *raftpb.Entry) {
if e.Type == raftpb.EntryNormal && len(e.Data) == 0 {
return
}
//get data type
//apply data accord with data type
dataType := e.Data[0]
switch dataType {
case utils.MySQLBinlogEventType:
s.applyMySQLBinlogEvent(e)
s.applyBroadcast.Send()
case utils.NodeAttributesType:
s.applyNodeAttributes(e)
case utils.SyncerArgsType:
s.applySyncerArgs(e)
case utils.MasterInfoType:
s.applyMasterInfo(e)
case utils.MasterGtidPurgedType:
s.applyMasterGtidPurged(e)
default:
log.Log.Fatalf("apply data not support,entry:%v,entry.data:%s", *e, string(e.Data))
}
}
//applyMySQLBinlogEvent implements apply mysql binlog event
func (s *KingbusServer) applyMySQLBinlogEvent(e *raftpb.Entry) {
var err error
binlogEvent := new(storagepb.BinlogEvent)
pbutil.MustUnmarshal(binlogEvent, e.Data[1:])
eventType := replication.EventType(binlogEvent.Type)
applyEps.Mark(1)
//update syncer executed gtid set
if binlogEvent.DividedCount == 0 || (binlogEvent.DividedCount != 0 && binlogEvent.DividedSeqNum == 0) {
err = s.binlogProgress.updateProcess(e.Index, binlogEvent.Data)
if err != nil {
log.Log.Fatalf("resetBinlogProgress error,err:%s,eventType:%v,data:%v",
err, eventType, binlogEvent.Data)
}
}
if needApply(eventType) {
err := s.applyBinlogEvent(binlogEvent.Data, eventType, e.Index)
if err != nil {
log.Log.Fatalf("apply binlog event error,err:%v,eventType:%v,binlogEvent:%v",
err, eventType, *binlogEvent)
}
}
}
//when syncer start, syncer will propose the master gtidPurged into cluster.
//all nodes will apply the gtidPurged, and initialize binlogProgress
func (s *KingbusServer) applyMasterGtidPurged(e *raftpb.Entry) {
var args config.MasterGtidPurged
var err error
err = json.Unmarshal(e.Data[1:], &args)
if err != nil {
log.Log.Fatalf("applyMasterGtidPurged error,err:%v,e:%v",
err, *e)
}
//1.update gtidPurged
gtids, err := gomysql.ParseGTIDSet(gomysql.MySQLFlavor, args.GtidPurged)
if err != nil {
log.Log.Fatalf("gomysql.ParseGTIDSet error,err: %s, gtids: %s", args.GtidPurged)
}
masterGtidPurged := gtids.(*gomysql.MysqlGTIDSet)
gtidPurged, err := s.store.GetGtidSet(gomysql.MySQLFlavor, storage.GtidPurgedKey)
if err != nil {
log.Log.Fatalf("NewSyncer:get gtidPurged error,err:%s", err)
}
syncerGtidPurged := gtidPurged.(*gomysql.MysqlGTIDSet)
//add the set which uuid not in syncer gtidPurged
for uuid, set := range masterGtidPurged.Sets {
if _, ok := syncerGtidPurged.Sets[uuid]; !ok {
syncerGtidPurged.AddSet(set)
}
}
err = s.store.SetGtidSet(gomysql.MySQLFlavor, storage.GtidPurgedKey, syncerGtidPurged)
if err != nil {
log.Log.Fatalf("SetGtidSet error,err: %s, gtids: %s", gtidPurged.String())
}
//reset binlogProgress
err = s.binlogProgress.reset(args.GtidPurged)
if err != nil {
log.Log.Fatalf("binlogProgress reset error,err: %s, gtids: %s", args.GtidPurged)
}
log.Log.Infof("applyMasterGtidPurged successfully,MasterGtidPurged:%v,executedGtidSet:%s,"+
"gtidPurged:%s", args, s.binlogProgress.ExecutedGtidSetStr(), gtidPurged.String())
}
//applyBinlogEvent must be idempotent
func (s *KingbusServer) applyBinlogEvent(eventRawData []byte, eventType replication.EventType, raftIndex uint64) error {
var err error
//save fde, don't need parse
if eventType == replication.FORMAT_DESCRIPTION_EVENT {
raftIndexStr := fmt.Sprintf("%020d", raftIndex)
fdeKey := path.Join(storage.FdePrefix, raftIndexStr)
key := utils.StringToBytes(fdeKey)
err = s.store.Set(key, eventRawData)
if err != nil {
log.Log.Errorf("SaveToStorage error,err:%s,key:%s,value:%v",
err, fdeKey, eventRawData)
return err
}
log.Log.Debugf("save fde into meta storage,raftIndex:%d", raftIndex)
return nil
}
//remove event header, parse event body, and save
eventRawData = eventRawData[replication.EventHeaderSize:]
//remove crc32
eventRawData = eventRawData[:len(eventRawData)-replication.BinlogChecksumLength]
switch eventType {
case replication.GTID_EVENT:
//update current_gitd
e := &replication.GTIDEvent{}
if err := e.Decode(eventRawData); err != nil {
log.Log.Errorf("Decode GtidEvent error,err:%s,eventRawData:%v", err, eventRawData)
return err
}
u, err := uuid.FromBytes(e.SID)
if err != nil {
return err
}
s.binlogProgress.currentGtid.Store(fmt.Sprintf("%s:%d", u.String(), e.GNO))
log.Log.Debugf("apply a GTID_EVENT,raftIndex:%d,s.s.currentGtid:%s", raftIndex, s.binlogProgress.currentGtid.Load())
case replication.ROTATE_EVENT:
e := &replication.RotateEvent{}
if err := e.Decode(eventRawData); err != nil {
return err
}
raftIndexStr := fmt.Sprintf("%020d", raftIndex)
nextBinlogFileKey := path.Join(storage.NextBinlogPrefix, raftIndexStr)
key := utils.StringToBytes(nextBinlogFileKey)
value := e.NextLogName
err = s.store.Set(key, value)
if err != nil {
log.Log.Errorf("SaveToStorage error,err:%s,key:%s,value:%s",
err, nextBinlogFileKey, string(value))
return err
}
//the the heartbeat event info
s.binlogProgress.lastBinlogFile.Store(utils.BytesToString(e.NextLogName))
log.Log.Debugf("apply a ROTATE_EVENT,raftIndex:%d,value:%s", raftIndex, string(value))
case replication.PREVIOUS_GTIDS_EVENT:
e := &replication.PreviousGtidsLogEvent{}
if err := e.Decode(eventRawData); err != nil {
return err
}
err = s.store.SetPreviousGtidSet(raftIndex, e.GSet)
if err != nil {
log.Log.Errorf("SetPreviousGtidSet error,err:%s,value:%s",
err, e.GSet.String())
return err
}
log.Log.Debugf("apply a PREVIOUS_GTIDS_EVENT,previousGtidSet:%s", e.GSet.String())
default:
log.Log.Errorf("do not need apply in kingbus")
return ErrUnsupport
}
return err
}
func (s *KingbusServer) applyNodeAttributes(e *raftpb.Entry) {
var attributes config.Attributes
var ms membership.Attributes
err := json.Unmarshal(e.Data[1:], &attributes)
if err != nil {
log.Log.Fatalf("applyNodeAttributes error,err:%v,e:%v",
err, *e)
}
ms.Name = attributes.Name
ms.AdminURLs = make([]string, len(attributes.AdminURLs))
copy(ms.AdminURLs, attributes.AdminURLs)
s.cluster.UpdateAttributes(attributes.ID, ms)
log.Log.Infof("applyNodeAttributes successfully,ms:%v", ms)
}
func (s *KingbusServer) applySyncerArgs(e *raftpb.Entry) {
var syncerArgs config.SyncerArgs
err := json.Unmarshal(e.Data[1:], &syncerArgs)
if err != nil {
log.Log.Fatalf("applySyncerArgs error,err:%v,e:%v",
err, *e)
}
err = s.store.Set(utils.StringToBytes(storage.SyncerArgsKey), e.Data[1:])
if err != nil {
log.Log.Fatalf("set SyncerArgsKey error,err:%v,e:%v",
err, *e)
}
log.Log.Infof("applySyncerArgs successfully,syncerArgs:%v", syncerArgs)
}
// applyConfChange applies a ConfChange to the server. It is only
// invoked with a ConfChange that has already passed through Raft
func (s *KingbusServer) applyConfChange(cc raftpb.ConfChange) (bool, error) {
if err := s.cluster.ValidateConfigurationChange(cc); err != nil {
cc.NodeID = etcdraft.None
confState := s.raftNode.ApplyConfChange(cc)
saveConfState(s.cluster.Store, confState)
return false, err
}
//save confState for restore
confState := s.raftNode.ApplyConfChange(cc)
defer saveConfState(s.cluster.Store, confState)
switch cc.Type {
case raftpb.ConfChangeAddNode:
m := new(membership.Member)
if err := json.Unmarshal(cc.Context, m); err != nil {
log.Log.Fatalf("unmarshal member should never fail: %v", err)
}
if cc.NodeID != uint64(m.ID) {
log.Log.Fatalf("nodeID should always be equal to member id")
}
s.cluster.AddMember(m)
if m.ID != s.id {
s.raftNode.Transport.AddPeer(m.ID, m.PeerURLs)
}
case raftpb.ConfChangeRemoveNode:
id := types.ID(cc.NodeID)
s.cluster.RemoveMember(id)
if id == s.id {
return true, nil
}
s.raftNode.Transport.RemovePeer(id)
case raftpb.ConfChangeUpdateNode:
m := new(membership.Member)
if err := json.Unmarshal(cc.Context, m); err != nil {
log.Log.Fatalf("unmarshal member should never fail: %v", err)
}
if cc.NodeID != uint64(m.ID) {
log.Log.Fatalf("nodeID should always be equal to member id")
}
s.cluster.UpdateRaftAttributes(m.ID, m.RaftAttributes)
if m.ID != s.id {
s.raftNode.Transport.UpdatePeer(m.ID, m.PeerURLs)
}
//todo ConfChangeAddLearnerNode
}
return false, nil
}
func (s *KingbusServer) applyMasterInfo(e *raftpb.Entry) {
var info mysql.MasterInfo
err := json.Unmarshal(e.Data[1:], &info)
if err != nil {
log.Log.Fatalf("applyMasterInfo error,err:%v,e:%v",
err, *e)
}
key := utils.StringToBytes(storage.MasterInfoKey)
err = s.store.Set(key, e.Data[1:])
if err != nil {
log.Log.Fatalf("applyFakeRotateEventArgs set store error,err:%s,key:%s,value:%s",
err, storage.MasterInfoKey, e.Data[1:])
}
log.Log.Debugf("applyMasterInfo,raftIndex:%d,masterInfo:%v", e.Index, info)
}
func saveConfState(store storage.Storage, confState *raftpb.ConfState) {
if confState == nil {
return
}
log.Log.Debugf("saveConfState:confState is %v", *confState)
value, err := json.Marshal(confState)
if err != nil {
log.Log.Fatalf("marshal confState error,err:%s,confState:%v", err, *confState)
}
key := utils.StringToBytes(storage.ConfStateKey)
err = store.Set(key, value)
if err != nil {
log.Log.Fatalf("SaveToStorage error,err:%s,key:%s,value:%v", err, storage.ConfStateKey, *confState)
}
}
func needApply(eventType replication.EventType) bool {
return eventType == replication.GTID_EVENT ||
eventType == replication.FORMAT_DESCRIPTION_EVENT ||
eventType == replication.ROTATE_EVENT ||
eventType == replication.PREVIOUS_GTIDS_EVENT
}