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replication.go
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replication.go
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package collector
import (
"encoding/json"
"errors"
"fmt"
"github.com/vinllen/mgo/bson"
"mongoshake/collector/filter"
"sync"
"mongoshake/collector/configure"
"mongoshake/collector/docsyncer"
"mongoshake/collector/transform"
"mongoshake/common"
"mongoshake/oplog"
"github.com/gugemichael/nimo4go"
LOG "github.com/vinllen/log4go"
"github.com/vinllen/mgo"
)
const (
SYNCMODE_ALL = "all"
SYNCMODE_DOCUMENT = "document"
SYNCMODE_OPLOG = "oplog"
)
// ReplicationCoordinator global coordinator instance. consist of
// one syncerGroup and a number of workers
type ReplicationCoordinator struct {
Sources []*utils.MongoSource
// Sentinel listener
sentinel *utils.Sentinel
// syncerGroup and workerGroup number is 1:N in ReplicaSet.
// 1:1 while replicated in shard cluster
syncerGroup []*OplogSyncer
rateController *nimo.SimpleRateController
}
func (coordinator *ReplicationCoordinator) Run() error {
// check all mongodb deployment and fetch the instance info
if err := coordinator.sanitizeMongoDB(); err != nil {
return err
}
LOG.Info("Collector startup. shard_by[%s] gids[%s]", conf.Options.ShardKey, conf.Options.OplogGIDS)
// all configurations has changed to immutable
opts, _ := json.Marshal(conf.Options)
LOG.Info("Collector configuration %s", string(opts))
coordinator.sentinel = &utils.Sentinel{}
coordinator.sentinel.Register()
syncMode, fullBeginTs, err := coordinator.selectSyncMode(conf.Options.SyncMode)
if err != nil {
return err
}
/*
* Generally speaking, it's better to use several bridge timestamp so that
* each shard match one in sharding mode.
* TODO
*/
LOG.Info("start running with mode[%v], fullBeginTs[%v]", syncMode, fullBeginTs)
switch syncMode {
case SYNCMODE_ALL:
if err := coordinator.startDocumentReplication(); err != nil {
return err
}
// get current newest timestamp
_, fullFinishTs, _, bigOldTs, _, err := utils.GetAllTimestamp(coordinator.Sources)
if err != nil {
return LOG.Critical("get full sync finish timestamp failed[%v]", err)
}
LOG.Info("------------------------full sync done!------------------------")
LOG.Info("bigOldTs[%v] fullBeginTs[%v] fullFinishTs[%v]", utils.ExtractTimestamp(bigOldTs),
utils.ExtractTimestamp(fullBeginTs), utils.ExtractTimestamp(fullFinishTs))
// the oldest oplog is lost
if utils.ExtractTimestamp(bigOldTs) >= fullBeginTs {
return LOG.Critical("incr sync fullBeginTs[%v] is less than current bigOldTs[%v], this error means user's "+
"oplog collection size is too small or full sync continues too long", fullBeginTs, bigOldTs)
}
LOG.Info("finish full sync, start incr sync with timestamp: fullBeginTs[%v], fullFinishTs[%v]",
utils.ExtractTimestamp(fullBeginTs), utils.ExtractTimestamp(fullFinishTs))
if err := coordinator.startOplogReplication(fullBeginTs, utils.TimestampToInt64(fullFinishTs)); err != nil {
return err
}
case SYNCMODE_DOCUMENT:
if err := coordinator.startDocumentReplication(); err != nil {
return err
}
case SYNCMODE_OPLOG:
beginTs := conf.Options.ContextStartPosition
if beginTs != 0 {
// get current oldest timestamp
_, _, _, bigOldTs, _, err := utils.GetAllTimestamp(coordinator.Sources)
if err != nil {
return LOG.Critical("get oldest timestamp failed[%v]", err)
}
// the oldest oplog is lost
if utils.ExtractTimestamp(bigOldTs) >= beginTs {
return LOG.Critical("incr sync beginTs[%v] is less than current bigOldTs[%v], this error means user's "+
"oplog collection size is too small or full sync continues too long", beginTs, bigOldTs)
}
}
if err := coordinator.startOplogReplication(beginTs, beginTs); err != nil {
return err
}
default:
return LOG.Critical("unknown sync mode %v", conf.Options.SyncMode)
}
return nil
}
func (coordinator *ReplicationCoordinator) sanitizeMongoDB() error {
var conn *utils.MongoConn
var err error
var hasUniqIndex = false
rs := map[string]int{}
// try to connect ContextStorageUrl
storageUrl := conf.Options.ContextStorageUrl
if conn, err = utils.NewMongoConn(storageUrl, utils.ConnectModePrimary, true); conn == nil || !conn.IsGood() || err != nil {
LOG.Critical("Connect storageUrl[%v] error[%v]. Please add primary node into 'mongo_urls' "+
"if 'context.storage.url' is empty", storageUrl, err)
return err
}
conn.Close()
csUrl := conf.Options.MongoCsUrl
if csUrl != "" {
// try to connect MongoCsUrl
if conn, err = utils.NewMongoConn(csUrl, utils.ConnectModePrimary, true); conn == nil || !conn.IsGood() || err != nil {
LOG.Critical("Connect MongoCsUrl[%v] error[%v].", csUrl, err)
return err
}
conn.Close()
}
for i, rawurl := range conf.Options.MongoUrls {
url, params := utils.ParseMongoUrl(rawurl)
coordinator.Sources[i] = new(utils.MongoSource)
coordinator.Sources[i].URL = url
if len(conf.Options.OplogGIDS) != 0 {
coordinator.Sources[i].Gids = conf.Options.OplogGIDS
}
if conn, err = utils.NewMongoConn(url, conf.Options.MongoConnectMode, true); conn == nil || !conn.IsGood() || err != nil {
return LOG.Critical("Connect mongo server from url[%v] error. %v. See https://github.com/alibaba/MongoShake/wiki/FAQ#q-how-to-solve-the-oplog-tailer-initialize-failed-no-reachable-servers-error", url, err)
}
// a conventional ReplicaSet should have local.oplog.rs collection
if conf.Options.SyncMode != SYNCMODE_DOCUMENT && !conn.HasOplogNs() {
conn.Close()
return LOG.Critical("no oplog ns in mongo. See https://github.com/alibaba/MongoShake/wiki/FAQ#q-how-to-solve-the-oplog-tailer-initialize-failed-no-oplog-ns-in-mongo-error")
}
// check if there has dup server every replica set in RS or Shard
rsName, err := conn.AcquireReplicaSetName()
// rsName will be set to default if empty
if err != nil {
if conf.Options.FilterOrphanDocument {
var ok bool
if rsName, ok = params["replicaSet"]; !ok {
conn.Close()
return LOG.Critical("acquire replica set name from url[%v] by replSetGetStatus failed. %v", url, err)
}
} else {
rsName = fmt.Sprintf("default-%d", i)
LOG.Warn("Source mongodb have empty replica set name, url[%s], change to default[%s]", url, rsName)
}
}
if _, exist := rs[rsName]; exist {
conn.Close()
return LOG.Critical("There has duplicate replica set name : %s", rsName)
}
rs[rsName] = 1
coordinator.Sources[i].Replset = rsName
// look around if there has uniq index
if !hasUniqIndex {
hasUniqIndex = conn.HasUniqueIndex()
}
// doesn't reuse current connection
conn.Close()
}
// we choose sharding by collection if there are unique index
// existing in collections
if conf.Options.ShardKey == oplog.ShardAutomatic {
if hasUniqIndex {
conf.Options.ShardKey = oplog.ShardByNamespace
} else {
conf.Options.ShardKey = oplog.ShardByID
}
}
return nil
}
// TODO, add UT
// if the oplog of checkpoint timestamp exist in all source db, then only do oplog replication instead of document replication
func (coordinator *ReplicationCoordinator) selectSyncMode(syncMode string) (string, int64, error) {
if syncMode != SYNCMODE_ALL {
return syncMode, 0, nil
}
// oldestTs is the smallest of the all newest timestamp
tsMap, _, smallNewTs, _, _, err := utils.GetAllTimestamp(coordinator.Sources)
if err != nil {
return syncMode, 0, err
}
needFull := false
ckptMap, err := docsyncer.LoadCheckpoint()
if err != nil {
return syncMode, 0, err
}
for replset, ts := range tsMap {
if _, ok := ckptMap[replset]; !ok {
needFull = true
break
}
if ts.Oldest >= ckptMap[replset] {
// checkpoint less than the oldest timestamp
needFull = true
break
}
}
if needFull {
return SYNCMODE_ALL, utils.TimestampToInt64(smallNewTs), nil
} else {
LOG.Info("sync mode change from 'all' to 'oplog'")
return SYNCMODE_OPLOG, 0, nil
}
}
func (coordinator *ReplicationCoordinator) startDocumentReplication() error {
shardingChunkMap := make(utils.ShardingChunkMap)
fromIsSharding := len(coordinator.Sources) > 1
if fromIsSharding {
ok, _ := utils.GetBalancerStatusByUrl(conf.Options.MongoCsUrl)
if ok {
LOG.Critical("source mongodb sharding need to stop balancer when document replication occur")
return errors.New("source mongodb sharding need to stop balancer when document replication occur")
}
if conf.Options.FilterOrphanDocument {
var err error
if shardingChunkMap, err = utils.GetChunkMapByUrl(conf.Options.MongoCsUrl); err != nil {
return err
}
}
}
// get all namespace need to sync
nsSet, err := docsyncer.GetAllNamespace(coordinator.Sources)
if err != nil {
return err
}
ckptMap := make(map[string]bson.MongoTimestamp)
// get all newest timestamp for each mongodb if sync mode isn't "document"
if conf.Options.SyncMode != SYNCMODE_DOCUMENT {
tsMap, _, _, _, _, err := utils.GetAllTimestamp(coordinator.Sources)
if err != nil {
return err
}
for replset, tsNode := range tsMap {
ckptMap[replset] = tsNode.Newest
}
}
toUrl := conf.Options.TunnelAddress[0]
var toConn *utils.MongoConn
if toConn, err = utils.NewMongoConn(toUrl, utils.ConnectModePrimary, true); err != nil {
return err
}
defer toConn.Close()
trans := transform.NewNamespaceTransform(conf.Options.TransformNamespace)
shardingSync := docsyncer.IsShardingToSharding(fromIsSharding, toConn)
nsExistedSet, err := docsyncer.StartDropDestCollection(nsSet, toConn, trans)
if err != nil {
return err
}
if shardingSync {
if err := docsyncer.StartNamespaceSpecSyncForSharding(conf.Options.MongoCsUrl, toConn, nsExistedSet, trans); err != nil {
return err
}
}
var wg sync.WaitGroup
var replError error
var mutex sync.Mutex
indexMap := make(map[utils.NS][]mgo.Index)
for _, src := range coordinator.Sources {
var orphanFilter *filter.OrphanFilter
if conf.Options.FilterOrphanDocument {
dbChunkMap := make(utils.DBChunkMap)
if chunkMap, ok := shardingChunkMap[src.Replset]; ok {
dbChunkMap = chunkMap
} else {
LOG.Warn("document syncer %v has no chunk map", src.Replset)
}
orphanFilter = filter.NewOrphanFilter(src.Replset, dbChunkMap)
}
dbSyncer := docsyncer.NewDBSyncer(src.Replset, src.URL, toUrl, trans, orphanFilter)
LOG.Info("document syncer %v begin replication for url=%v", src.Replset, src.URL)
wg.Add(1)
nimo.GoRoutine(func() {
defer wg.Done()
if err := dbSyncer.Start(); err != nil {
LOG.Critical("document replication for url=%v failed. %v", src.URL, err)
replError = err
}
mutex.Lock()
defer mutex.Unlock()
for ns, indexList := range dbSyncer.GetIndexMap() {
indexMap[ns] = indexList
}
})
}
wg.Wait()
if replError != nil {
return replError
}
if err := docsyncer.StartIndexSync(indexMap, toUrl, nsExistedSet, trans); err != nil {
return err
}
// checkpoint after document syncer
if conf.Options.SyncMode != SYNCMODE_DOCUMENT {
LOG.Info("try to set checkpoint with map[%v]", ckptMap)
if err := docsyncer.FlushCheckpoint(ckptMap); err != nil {
LOG.Error("document syncer flush checkpoint failed. %v", err)
return err
}
}
LOG.Info("document syncer sync end")
return nil
}
func (coordinator *ReplicationCoordinator) startOplogReplication(oplogStartPosition, fullSyncFinishPosition int64) error {
// replicate speed limit on all syncer
coordinator.rateController = nimo.NewSimpleRateController()
ckptManager := NewCheckpointManager(oplogStartPosition)
mvckManager := NewMoveChunkManager(ckptManager)
ddlManager := NewDDLManager(ckptManager)
// prepare all syncer. only one syncer while source is ReplicaSet
// otherwise one syncer connects to one shard
for _, src := range coordinator.Sources {
syncer := NewOplogSyncer(coordinator, src.Replset, fullSyncFinishPosition,
src.URL, src.Gids, ckptManager, mvckManager, ddlManager)
// syncerGroup http api registry
syncer.init()
ckptManager.addOplogSyncer(syncer)
if conf.Options.MoveChunkEnable {
mvckManager.addOplogSyncer(syncer)
}
if DDLSupportForSharding() {
ddlManager.addOplogSyncer(syncer)
}
coordinator.syncerGroup = append(coordinator.syncerGroup, syncer)
}
// prepare worker routine and bind it to syncer
for i := 0; i != conf.Options.WorkerNum; i++ {
syncer := coordinator.syncerGroup[i%len(coordinator.syncerGroup)]
w := NewWorker(coordinator, syncer, uint32(i))
if !w.init() {
return errors.New("worker initialize error")
}
// syncer and worker are independent. the relationship between
// them needs binding here. one worker definitely belongs to a specific
// syncer. However individual syncer could bind multi workers (if source
// of overall replication is single mongodb replica)
syncer.bind(w)
go w.startWorker()
}
// initialize checkpoint timestamp of oplog syncer
if err := ckptManager.Load(); err != nil {
return err
}
ckptManager.start()
if conf.Options.MoveChunkEnable {
mvckManager.start()
}
if DDLSupportForSharding() {
ddlManager.start()
}
for _, syncer := range coordinator.syncerGroup {
go syncer.start()
}
return nil
}
func DDLSupportForSharding() bool {
return !conf.Options.ReplayerDMLOnly && conf.Options.MongoCsUrl != ""
}