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package filer
import (
"context"
"fmt"
"github.com/seaweedfs/seaweedfs/weed/pb/master_pb"
"github.com/seaweedfs/seaweedfs/weed/util"
"io"
"strings"
"sync"
"sync/atomic"
"time"
"google.golang.org/grpc"
"google.golang.org/protobuf/proto"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/pb"
"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
"github.com/seaweedfs/seaweedfs/weed/util/log_buffer"
)
type MetaAggregator struct {
filer *Filer
self pb.ServerAddress
isLeader bool
grpcDialOption grpc.DialOption
MetaLogBuffer *log_buffer.LogBuffer
peerChans map[pb.ServerAddress]chan struct{}
peerChansLock sync.Mutex
// 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(filer *Filer, self pb.ServerAddress, grpcDialOption grpc.DialOption) *MetaAggregator {
t := &MetaAggregator{
filer: filer,
self: self,
grpcDialOption: grpcDialOption,
peerChans: make(map[pb.ServerAddress]chan struct{}),
}
t.ListenersCond = sync.NewCond(&t.ListenersLock)
t.MetaLogBuffer = log_buffer.NewLogBuffer("aggr", LogFlushInterval, nil, nil, func() {
t.ListenersCond.Broadcast()
})
return t
}
func (ma *MetaAggregator) OnPeerUpdate(update *master_pb.ClusterNodeUpdate, startFrom time.Time) {
ma.peerChansLock.Lock()
defer ma.peerChansLock.Unlock()
address := pb.ServerAddress(update.Address)
if update.IsAdd {
// cancel previous subscription if any
if prevChan, found := ma.peerChans[address]; found {
close(prevChan)
}
stopChan := make(chan struct{})
ma.peerChans[address] = stopChan
go ma.loopSubscribeToOneFiler(ma.filer, ma.self, address, startFrom, stopChan)
} else {
if prevChan, found := ma.peerChans[address]; found {
close(prevChan)
delete(ma.peerChans, address)
}
}
}
func (ma *MetaAggregator) loopSubscribeToOneFiler(f *Filer, self pb.ServerAddress, peer pb.ServerAddress, startFrom time.Time, stopChan chan struct{}) {
lastTsNs := startFrom.UnixNano()
for {
glog.V(0).Infof("loopSubscribeToOneFiler read %s start from %v %d", peer, time.Unix(0, lastTsNs), lastTsNs)
nextLastTsNs, err := ma.doSubscribeToOneFiler(f, self, peer, lastTsNs)
// check stopChan to see if we should stop
select {
case <-stopChan:
glog.V(0).Infof("stop subscribing peer %s meta change", peer)
return
default:
}
if err != nil {
errLvl := glog.Level(0)
if strings.Contains(err.Error(), "duplicated local subscription detected") {
errLvl = glog.Level(4)
}
glog.V(errLvl).Infof("subscribing remote %s meta change: %v", peer, err)
}
if lastTsNs < nextLastTsNs {
lastTsNs = nextLastTsNs
}
time.Sleep(1733 * time.Millisecond)
}
}
func (ma *MetaAggregator) doSubscribeToOneFiler(f *Filer, self pb.ServerAddress, peer pb.ServerAddress, startFrom int64) (int64, error) {
/*
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 := startFrom
peerSignature, err := ma.readFilerStoreSignature(peer)
if err != nil {
return lastTsNs, fmt.Errorf("connecting to peer filer %s: %v", peer, err)
}
// when filer store is not shared by multiple filers
if peerSignature != f.Signature {
if prevTsNs, err := ma.readOffset(f, peer, peerSignature); err == nil {
lastTsNs = prevTsNs
defer func(prevTsNs int64) {
if lastTsNs != prevTsNs && lastTsNs != lastPersistTime.UnixNano() {
if err := ma.updateOffset(f, peer, peerSignature, lastTsNs); err == nil {
glog.V(0).Infof("last sync time with %s at %v (%d)", peer, time.Unix(0, lastTsNs), lastTsNs)
} else {
glog.Errorf("failed to save last sync time with %s at %v (%d)", peer, time.Unix(0, lastTsNs), 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.AddDataToBuffer([]byte(dir), data, event.TsNs)
if maybeReplicateMetadataChange != nil {
maybeReplicateMetadataChange(event)
}
return nil
}
glog.V(0).Infof("subscribing remote %s meta change: %v, clientId:%d", peer, time.Unix(0, lastTsNs), ma.filer.UniqueFilerId)
err = pb.WithFilerClient(true, 0, peer, ma.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
atomic.AddInt32(&ma.filer.UniqueFilerEpoch, 1)
stream, err := client.SubscribeLocalMetadata(ctx, &filer_pb.SubscribeMetadataRequest{
ClientName: "filer:" + string(self),
PathPrefix: "/",
SinceNs: lastTsNs,
ClientId: ma.filer.UniqueFilerId,
ClientEpoch: atomic.LoadInt32(&ma.filer.UniqueFilerEpoch),
})
if err != nil {
glog.V(0).Infof("SubscribeLocalMetadata %v: %v", peer, err)
return fmt.Errorf("subscribe: %v", err)
}
for {
resp, listenErr := stream.Recv()
if listenErr == io.EOF {
return nil
}
if listenErr != nil {
glog.V(0).Infof("SubscribeLocalMetadata stream %v: %v", peer, listenErr)
return listenErr
}
if err := processEventFn(resp); err != nil {
glog.V(0).Infof("SubscribeLocalMetadata process %v: %v", resp, err)
return fmt.Errorf("process %v: %v", resp, err)
}
f.onMetadataChangeEvent(resp)
lastTsNs = resp.TsNs
}
})
return lastTsNs, err
}
func (ma *MetaAggregator) readFilerStoreSignature(peer pb.ServerAddress) (sig int32, err error) {
err = pb.WithFilerClient(false, 0, 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 GetPeerMetaOffsetKey(peerSignature int32) []byte {
key := []byte(MetaOffsetPrefix + "xxxx")
util.Uint32toBytes(key[len(MetaOffsetPrefix):], uint32(peerSignature))
return key
}
func (ma *MetaAggregator) readOffset(f *Filer, peer pb.ServerAddress, peerSignature int32) (lastTsNs int64, err error) {
key := GetPeerMetaOffsetKey(peerSignature)
value, err := f.Store.KvGet(context.Background(), key)
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 := GetPeerMetaOffsetKey(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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