mirror of
https://github.com/seaweedfs/seaweedfs.git
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264 lines
7.5 KiB
Go
264 lines
7.5 KiB
Go
package filer
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import (
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"context"
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"fmt"
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"github.com/chrislusf/seaweedfs/weed/cluster"
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"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
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"github.com/chrislusf/seaweedfs/weed/util"
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"io"
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"sync"
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"time"
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"github.com/golang/protobuf/proto"
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"google.golang.org/grpc"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/pb"
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"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
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"github.com/chrislusf/seaweedfs/weed/util/log_buffer"
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)
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type MetaAggregator struct {
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filer *Filer
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self pb.ServerAddress
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isLeader bool
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grpcDialOption grpc.DialOption
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MetaLogBuffer *log_buffer.LogBuffer
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peerStatues map[pb.ServerAddress]int
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peerStatuesLock sync.Mutex
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// notifying clients
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ListenersLock sync.Mutex
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ListenersCond *sync.Cond
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}
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// MetaAggregator only aggregates data "on the fly". The logs are not re-persisted to disk.
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// The old data comes from what each LocalMetadata persisted on disk.
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func NewMetaAggregator(filer *Filer, self pb.ServerAddress, grpcDialOption grpc.DialOption) *MetaAggregator {
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t := &MetaAggregator{
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filer: filer,
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self: self,
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grpcDialOption: grpcDialOption,
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peerStatues: make(map[pb.ServerAddress]int),
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}
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t.ListenersCond = sync.NewCond(&t.ListenersLock)
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t.MetaLogBuffer = log_buffer.NewLogBuffer("aggr", LogFlushInterval, nil, func() {
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t.ListenersCond.Broadcast()
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})
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return t
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}
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func (ma *MetaAggregator) OnPeerUpdate(update *master_pb.ClusterNodeUpdate) {
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if update.NodeType != cluster.FilerType {
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return
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}
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address := pb.ServerAddress(update.Address)
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if update.IsAdd {
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// every filer should subscribe to a new filer
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if ma.setActive(address, true) {
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go ma.subscribeToOneFiler(ma.filer, ma.self, address)
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}
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} else {
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ma.setActive(address, false)
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}
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}
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func (ma *MetaAggregator) setActive(address pb.ServerAddress, isActive bool) (notDuplicated bool) {
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ma.peerStatuesLock.Lock()
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defer ma.peerStatuesLock.Unlock()
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if isActive {
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if _, found := ma.peerStatues[address]; found {
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ma.peerStatues[address] += 1
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} else {
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ma.peerStatues[address] = 1
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notDuplicated = true
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}
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} else {
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if _, found := ma.peerStatues[address]; found {
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delete(ma.peerStatues, address)
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}
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}
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return
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}
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func (ma *MetaAggregator) isActive(address pb.ServerAddress) (isActive bool) {
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ma.peerStatuesLock.Lock()
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defer ma.peerStatuesLock.Unlock()
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var count int
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count, isActive = ma.peerStatues[address]
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return count > 0 && isActive
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}
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func (ma *MetaAggregator) subscribeToOneFiler(f *Filer, self pb.ServerAddress, peer pb.ServerAddress) {
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/*
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Each filer reads the "filer.store.id", which is the store's signature when filer starts.
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When reading from other filers' local meta changes:
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* if the received change does not contain signature from self, apply the change to current filer store.
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Upon connecting to other filers, need to remember their signature and their offsets.
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*/
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var maybeReplicateMetadataChange func(*filer_pb.SubscribeMetadataResponse)
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lastPersistTime := time.Now()
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lastTsNs := time.Now().Add(-LogFlushInterval).UnixNano()
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peerSignature, err := ma.readFilerStoreSignature(peer)
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for err != nil {
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glog.V(0).Infof("connecting to peer filer %s: %v", peer, err)
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time.Sleep(1357 * time.Millisecond)
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peerSignature, err = ma.readFilerStoreSignature(peer)
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}
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// when filer store is not shared by multiple filers
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if peerSignature != f.Signature {
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lastTsNs = 0
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if prevTsNs, err := ma.readOffset(f, peer, peerSignature); err == nil {
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lastTsNs = prevTsNs
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}
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glog.V(0).Infof("follow peer: %v, last %v (%d)", peer, time.Unix(0, lastTsNs), lastTsNs)
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var counter int64
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var synced bool
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maybeReplicateMetadataChange = func(event *filer_pb.SubscribeMetadataResponse) {
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if err := Replay(f.Store, event); err != nil {
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glog.Errorf("failed to reply metadata change from %v: %v", peer, err)
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return
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}
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counter++
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if lastPersistTime.Add(time.Minute).Before(time.Now()) {
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if err := ma.updateOffset(f, peer, peerSignature, event.TsNs); err == nil {
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if event.TsNs < time.Now().Add(-2*time.Minute).UnixNano() {
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glog.V(0).Infof("sync with %s progressed to: %v %0.2f/sec", peer, time.Unix(0, event.TsNs), float64(counter)/60.0)
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} else if !synced {
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synced = true
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glog.V(0).Infof("synced with %s", peer)
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}
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lastPersistTime = time.Now()
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counter = 0
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} else {
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glog.V(0).Infof("failed to update offset for %v: %v", peer, err)
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}
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}
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}
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}
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processEventFn := func(event *filer_pb.SubscribeMetadataResponse) error {
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data, err := proto.Marshal(event)
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if err != nil {
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glog.Errorf("failed to marshal subscribed filer_pb.SubscribeMetadataResponse %+v: %v", event, err)
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return err
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}
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dir := event.Directory
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// println("received meta change", dir, "size", len(data))
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ma.MetaLogBuffer.AddToBuffer([]byte(dir), data, event.TsNs)
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if maybeReplicateMetadataChange != nil {
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maybeReplicateMetadataChange(event)
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}
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return nil
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}
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for {
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glog.V(4).Infof("subscribing remote %s meta change: %v", peer, time.Unix(0, lastTsNs))
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err := pb.WithFilerClient(true, peer, ma.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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stream, err := client.SubscribeLocalMetadata(ctx, &filer_pb.SubscribeMetadataRequest{
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ClientName: "filer:" + string(self),
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PathPrefix: "/",
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SinceNs: lastTsNs,
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ClientId: int32(ma.filer.UniqueFileId),
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})
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if err != nil {
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return fmt.Errorf("subscribe: %v", err)
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}
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for {
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resp, listenErr := stream.Recv()
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if listenErr == io.EOF {
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return nil
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}
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if listenErr != nil {
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return listenErr
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}
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if err := processEventFn(resp); err != nil {
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return fmt.Errorf("process %v: %v", resp, err)
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}
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lastTsNs = resp.TsNs
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f.onMetadataChangeEvent(resp)
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}
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})
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if !ma.isActive(peer) {
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glog.V(0).Infof("stop subscribing remote %s meta change", peer)
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return
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}
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if err != nil {
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glog.V(0).Infof("subscribing remote %s meta change: %v", peer, err)
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time.Sleep(1733 * time.Millisecond)
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}
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}
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}
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func (ma *MetaAggregator) readFilerStoreSignature(peer pb.ServerAddress) (sig int32, err error) {
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err = pb.WithFilerClient(false, peer, ma.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
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resp, err := client.GetFilerConfiguration(context.Background(), &filer_pb.GetFilerConfigurationRequest{})
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if err != nil {
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return err
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}
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sig = resp.Signature
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return nil
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})
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return
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}
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const (
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MetaOffsetPrefix = "Meta"
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)
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func (ma *MetaAggregator) readOffset(f *Filer, peer pb.ServerAddress, peerSignature int32) (lastTsNs int64, err error) {
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key := []byte(MetaOffsetPrefix + "xxxx")
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util.Uint32toBytes(key[len(MetaOffsetPrefix):], uint32(peerSignature))
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value, err := f.Store.KvGet(context.Background(), key)
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if err == ErrKvNotFound {
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glog.Warningf("readOffset %s not found", peer)
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return 0, nil
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}
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if err != nil {
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return 0, fmt.Errorf("readOffset %s : %v", peer, err)
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}
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lastTsNs = int64(util.BytesToUint64(value))
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glog.V(0).Infof("readOffset %s : %d", peer, lastTsNs)
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return
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}
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func (ma *MetaAggregator) updateOffset(f *Filer, peer pb.ServerAddress, peerSignature int32, lastTsNs int64) (err error) {
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key := []byte(MetaOffsetPrefix + "xxxx")
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util.Uint32toBytes(key[len(MetaOffsetPrefix):], uint32(peerSignature))
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value := make([]byte, 8)
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util.Uint64toBytes(value, uint64(lastTsNs))
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err = f.Store.KvPut(context.Background(), key, value)
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if err != nil {
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return fmt.Errorf("updateOffset %s : %v", peer, err)
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}
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glog.V(4).Infof("updateOffset %s : %d", peer, lastTsNs)
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return
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}
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