package filer import ( "context" "fmt" "github.com/chrislusf/seaweedfs/weed/util" "io" "sync" "time" "github.com/golang/protobuf/proto" "google.golang.org/grpc" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/pb" "github.com/chrislusf/seaweedfs/weed/pb/filer_pb" "github.com/chrislusf/seaweedfs/weed/util/log_buffer" ) type MetaAggregator struct { filers []pb.ServerAddress grpcDialOption grpc.DialOption MetaLogBuffer *log_buffer.LogBuffer // notifying clients ListenersLock sync.Mutex ListenersCond *sync.Cond } // MetaAggregator only aggregates data "on the fly". The logs are not re-persisted to disk. // The old data comes from what each LocalMetadata persisted on disk. func NewMetaAggregator(filers []pb.ServerAddress, grpcDialOption grpc.DialOption) *MetaAggregator { t := &MetaAggregator{ filers: filers, grpcDialOption: grpcDialOption, } t.ListenersCond = sync.NewCond(&t.ListenersLock) t.MetaLogBuffer = log_buffer.NewLogBuffer("aggr", LogFlushInterval, nil, func() { t.ListenersCond.Broadcast() }) return t } func (ma *MetaAggregator) StartLoopSubscribe(f *Filer, self pb.ServerAddress) { for _, filer := range ma.filers { go ma.subscribeToOneFiler(f, self, filer) } } func (ma *MetaAggregator) subscribeToOneFiler(f *Filer, self pb.ServerAddress, peer pb.ServerAddress) { /* Each filer reads the "filer.store.id", which is the store's signature when filer starts. When reading from other filers' local meta changes: * if the received change does not contain signature from self, apply the change to current filer store. Upon connecting to other filers, need to remember their signature and their offsets. */ var maybeReplicateMetadataChange func(*filer_pb.SubscribeMetadataResponse) lastPersistTime := time.Now() lastTsNs := time.Now().Add(-LogFlushInterval).UnixNano() peerSignature, err := ma.readFilerStoreSignature(peer) for err != nil { glog.V(0).Infof("connecting to peer filer %s: %v", peer, err) time.Sleep(1357 * time.Millisecond) peerSignature, err = ma.readFilerStoreSignature(peer) } // when filer store is not shared by multiple filers if peerSignature != f.Signature { lastTsNs = 0 if prevTsNs, err := ma.readOffset(f, peer, peerSignature); err == nil { lastTsNs = prevTsNs } glog.V(0).Infof("follow peer: %v, last %v (%d)", peer, time.Unix(0, lastTsNs), lastTsNs) var counter int64 var synced bool maybeReplicateMetadataChange = func(event *filer_pb.SubscribeMetadataResponse) { if err := Replay(f.Store, event); err != nil { glog.Errorf("failed to reply metadata change from %v: %v", peer, err) return } counter++ if lastPersistTime.Add(time.Minute).Before(time.Now()) { if err := ma.updateOffset(f, peer, peerSignature, event.TsNs); err == nil { if event.TsNs < time.Now().Add(-2*time.Minute).UnixNano() { glog.V(0).Infof("sync with %s progressed to: %v %0.2f/sec", peer, time.Unix(0, event.TsNs), float64(counter)/60.0) } else if !synced { synced = true glog.V(0).Infof("synced with %s", peer) } lastPersistTime = time.Now() counter = 0 } else { glog.V(0).Infof("failed to update offset for %v: %v", peer, err) } } } } processEventFn := func(event *filer_pb.SubscribeMetadataResponse) error { data, err := proto.Marshal(event) if err != nil { glog.Errorf("failed to marshal subscribed filer_pb.SubscribeMetadataResponse %+v: %v", event, err) return err } dir := event.Directory // println("received meta change", dir, "size", len(data)) ma.MetaLogBuffer.AddToBuffer([]byte(dir), data, event.TsNs) if maybeReplicateMetadataChange != nil { maybeReplicateMetadataChange(event) } return nil } for { glog.V(4).Infof("subscribing remote %s meta change: %v", peer, time.Unix(0, lastTsNs)) err := pb.WithFilerClient(peer, ma.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error { ctx, cancel := context.WithCancel(context.Background()) defer cancel() stream, err := client.SubscribeLocalMetadata(ctx, &filer_pb.SubscribeMetadataRequest{ ClientName: "filer:" + string(self), PathPrefix: "/", SinceNs: lastTsNs, }) if err != nil { return fmt.Errorf("subscribe: %v", err) } for { resp, listenErr := stream.Recv() if listenErr == io.EOF { return nil } if listenErr != nil { return listenErr } if err := processEventFn(resp); err != nil { return fmt.Errorf("process %v: %v", resp, err) } lastTsNs = resp.TsNs f.onMetadataChangeEvent(resp) } }) if err != nil { glog.V(0).Infof("subscribing remote %s meta change: %v", peer, err) time.Sleep(1733 * time.Millisecond) } } } func (ma *MetaAggregator) readFilerStoreSignature(peer pb.ServerAddress) (sig int32, err error) { err = pb.WithFilerClient(peer, ma.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error { resp, err := client.GetFilerConfiguration(context.Background(), &filer_pb.GetFilerConfigurationRequest{}) if err != nil { return err } sig = resp.Signature return nil }) return } const ( MetaOffsetPrefix = "Meta" ) func (ma *MetaAggregator) readOffset(f *Filer, peer pb.ServerAddress, peerSignature int32) (lastTsNs int64, err error) { key := []byte(MetaOffsetPrefix + "xxxx") util.Uint32toBytes(key[len(MetaOffsetPrefix):], uint32(peerSignature)) value, err := f.Store.KvGet(context.Background(), key) if err == ErrKvNotFound { glog.Warningf("readOffset %s not found", peer) return 0, nil } if err != nil { return 0, fmt.Errorf("readOffset %s : %v", peer, err) } lastTsNs = int64(util.BytesToUint64(value)) glog.V(0).Infof("readOffset %s : %d", peer, lastTsNs) return } func (ma *MetaAggregator) updateOffset(f *Filer, peer pb.ServerAddress, peerSignature int32, lastTsNs int64) (err error) { key := []byte(MetaOffsetPrefix + "xxxx") util.Uint32toBytes(key[len(MetaOffsetPrefix):], uint32(peerSignature)) value := make([]byte, 8) util.Uint64toBytes(value, uint64(lastTsNs)) err = f.Store.KvPut(context.Background(), key, value) if err != nil { return fmt.Errorf("updateOffset %s : %v", peer, err) } glog.V(4).Infof("updateOffset %s : %d", peer, lastTsNs) return }