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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 []string
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 []string, 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 string) {
for _, filer := range ma.filers {
go ma.subscribeToOneFiler(f, self, filer)
}
}
func (ma *MetaAggregator) subscribeToOneFiler(f *Filer, self string, peer string) {
/*
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, 0)
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:" + 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 string) (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 string, 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 string, 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
}
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