add batch index for each memory buffer

weed/cluster/lock_client.go

@@ -73,6 +73,7 @@ func (lc *LockClient) StartLock(key string, owner string) (lock *LiveLock) {
 			return nil
 		}, func(err error) (shouldContinue bool) {
 			if err != nil {
+				glog.Warningf("create lock %s: %s", key, err)
 				time.Sleep(time.Second)
 			}
 			return lock.renewToken == ""

weed/filer/filer_notify.go

@@ -3,6 +3,7 @@ package filer
 import (
 	"context"
 	"fmt"
+	"github.com/seaweedfs/seaweedfs/weed/util/log_buffer"
 	"io"
 	"math"
 	"regexp"
@@ -113,11 +114,10 @@ var (
 	VolumeNotFoundPattern = regexp.MustCompile(`volume \d+? not found`)
 )
 
-func (f *Filer) ReadPersistedLogBuffer(startTime time.Time, stopTsNs int64, eachLogEntryFn func(logEntry *filer_pb.LogEntry) error) (lastTsNs int64, isDone bool, err error) {
+func (f *Filer) ReadPersistedLogBuffer(startPosition log_buffer.MessagePosition, stopTsNs int64, eachLogEntryFn func(logEntry *filer_pb.LogEntry) error) (lastTsNs int64, isDone bool, err error) {
 
-	startTime = startTime.UTC()
+	startDate := fmt.Sprintf("%04d-%02d-%02d", startPosition.Year(), startPosition.Month(), startPosition.Day())
-	startDate := fmt.Sprintf("%04d-%02d-%02d", startTime.Year(), startTime.Month(), startTime.Day())
+	startHourMinute := fmt.Sprintf("%02d-%02d", startPosition.Hour(), startPosition.Minute())
-	startHourMinute := fmt.Sprintf("%02d-%02d", startTime.Hour(), startTime.Minute())
 	var stopDate, stopHourMinute string
 	if stopTsNs != 0 {
 		stopTime := time.Unix(0, stopTsNs+24*60*60*int64(time.Nanosecond)).UTC()
@@ -126,7 +126,7 @@ func (f *Filer) ReadPersistedLogBuffer(startTime time.Time, stopTsNs int64, each
 	}
 
 	sizeBuf := make([]byte, 4)
-	startTsNs := startTime.UnixNano()
+	startTsNs := startPosition.UnixNano()
 
 	dayEntries, _, listDayErr := f.ListDirectoryEntries(context.Background(), SystemLogDir, startDate, true, math.MaxInt32, "", "", "")
 	if listDayErr != nil {

weed/mq/broker/broker_grpc_pub_balancer.go

@@ -1,7 +1,6 @@
 package broker
 
 import (
-	"github.com/seaweedfs/seaweedfs/weed/glog"
 	"github.com/seaweedfs/seaweedfs/weed/mq/pub_balancer"
 	"github.com/seaweedfs/seaweedfs/weed/pb/mq_pb"
 	"google.golang.org/grpc/codes"
@@ -41,7 +40,7 @@ func (b *MessageQueueBroker) PublisherToPubBalancer(stream mq_pb.SeaweedMessagin
 		}
 		if receivedStats := req.GetStats(); receivedStats != nil {
 			b.Balancer.OnBrokerStatsUpdated(initMessage.Broker, brokerStats, receivedStats)
-			glog.V(4).Infof("received from %v: %+v", initMessage.Broker, receivedStats)
+			// glog.V(4).Infof("received from %v: %+v", initMessage.Broker, receivedStats)
 		}
 	}
 

weed/mq/broker/broker_grpc_sub.go

@@ -7,6 +7,7 @@ import (
 	"github.com/seaweedfs/seaweedfs/weed/mq/topic"
 	"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
 	"github.com/seaweedfs/seaweedfs/weed/pb/mq_pb"
+	"github.com/seaweedfs/seaweedfs/weed/util/log_buffer"
 	"time"
 )
 
@@ -38,12 +39,30 @@ func (b *MessageQueueBroker) SubscribeMessage(req *mq_pb.SubscribeMessageRequest
 	}()
 
 	ctx := stream.Context()
-	startTime := time.Now()
+	var startPosition log_buffer.MessagePosition
-	if startTs := req.GetInit().GetPartitionOffset().GetTsNs(); startTs > 0 {
+	var inMemoryOnly bool
-		startTime = time.Unix(0, startTs)
+	if req.GetInit()!=nil && req.GetInit().GetPartitionOffset() != nil {
+		offset := req.GetInit().GetPartitionOffset()
+		if offset.StartTsNs != 0 {
+			startPosition = log_buffer.NewMessagePosition(offset.StartTsNs, -2)
+		}
+		if offset.StartType == mq_pb.PartitionOffsetStartType_EARLIEST {
+			startPosition = log_buffer.NewMessagePosition(1, -2)
+		} else if offset.StartType == mq_pb.PartitionOffsetStartType_LATEST {
+			startPosition = log_buffer.NewMessagePosition(time.Now().UnixNano(), -2)
+		} else if offset.StartType == mq_pb.PartitionOffsetStartType_EARLIEST_IN_MEMORY {
+			inMemoryOnly = true
+			for !localTopicPartition.HasData() {
+				time.Sleep(337 * time.Millisecond)
+			}
+			memPosition := localTopicPartition.GetEarliestInMemoryMessagePosition()
+			if startPosition.Before(memPosition.Time) {
+				startPosition = memPosition
+			}
+		}
 	}
 
-	localTopicPartition.Subscribe(clientName, startTime, func() bool {
+	localTopicPartition.Subscribe(clientName, startPosition, inMemoryOnly, func() bool {
 		if !isConnected {
 			return false
 		}
@@ -51,7 +70,7 @@ func (b *MessageQueueBroker) SubscribeMessage(req *mq_pb.SubscribeMessageRequest
 		if sleepIntervalCount > 10 {
 			sleepIntervalCount = 10
 		}
-		time.Sleep(time.Duration(sleepIntervalCount) * 2339 * time.Millisecond)
+		time.Sleep(time.Duration(sleepIntervalCount) * 337 * time.Millisecond)
 
 		// Check if the client has disconnected by monitoring the context
 		select {

weed/mq/client/cmd/weed_sub/subscriber.go

@@ -3,6 +3,7 @@ package main
 import (
 	"flag"
 	"fmt"
+	"github.com/seaweedfs/seaweedfs/weed/glog"
 	"github.com/seaweedfs/seaweedfs/weed/mq/client/sub_client"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials/insecure"
@@ -40,13 +41,15 @@ func main() {
 	brokers := strings.Split(*seedBrokers, ",")
 	subscriber := sub_client.NewTopicSubscriber(brokers, subscriberConfig, contentConfig, processorConfig)
 
+	counter := 0
 	subscriber.SetEachMessageFunc(func(key, value []byte) (bool, error) {
-		println(string(key), "=>", string(value))
+		counter++
+		println(string(key), "=>", string(value), counter)
 		return true, nil
 	})
 
 	subscriber.SetCompletionFunc(func() {
-		println("done subscribing")
+		glog.V(0).Infof("done recived %d messages", counter)
 	})
 
 	if err := subscriber.Subscribe(); err != nil {

weed/mq/client/sub_client/connect_to_sub_coordinator.go

@@ -114,7 +114,8 @@ func (sub *TopicSubscriber) onEachPartition(partition *mq_pb.Partition, broker s
 							RangeStart: partition.RangeStart,
 							RangeStop:  partition.RangeStop,
 						},
-						TsNs: sub.alreadyProcessedTsNs,
+						StartTsNs: sub.alreadyProcessedTsNs,
+						StartType: mq_pb.PartitionOffsetStartType_EARLIEST_IN_MEMORY,
 					},
 					Filter: sub.ContentConfig.Filter,
 				},

weed/mq/topic/local_partition.go

@@ -47,8 +47,20 @@ func (p *LocalPartition) Publish(message *mq_pb.DataMessage) {
 	p.logBuffer.AddToBuffer(message.Key, message.Value, time.Now().UnixNano())
 }
 
-func (p *LocalPartition) Subscribe(clientName string, startReadTime time.Time, onNoMessageFn func() bool, eachMessageFn OnEachMessageFn) {
+func (p *LocalPartition) Subscribe(clientName string, startPosition log_buffer.MessagePosition, inMemoryOnly bool, onNoMessageFn func() bool, eachMessageFn OnEachMessageFn) {
-	p.logBuffer.LoopProcessLogData(clientName, startReadTime, 0, onNoMessageFn, eachMessageFn)
+	p.logBuffer.LoopProcessLogData(clientName, startPosition, inMemoryOnly, 0, onNoMessageFn, eachMessageFn)
+}
+
+func (p *LocalPartition) GetEarliestMessageTimeInMemory() time.Time {
+	return p.logBuffer.GetEarliestTime()
+}
+
+func (p *LocalPartition) HasData() bool {
+	return !p.logBuffer.GetEarliestTime().IsZero()
+}
+
+func (p *LocalPartition) GetEarliestInMemoryMessagePosition() log_buffer.MessagePosition {
+	return p.logBuffer.GetEarliestPosition()
 }
 
 func FromPbBrokerPartitionAssignment(self pb.ServerAddress, assignment *mq_pb.BrokerPartitionAssignment) *LocalPartition {

weed/pb/mq.proto

@@ -73,9 +73,17 @@ message Offset {
     repeated PartitionOffset partition_offsets = 2;
 }
 
+enum PartitionOffsetStartType {
+    EARLIEST = 0;
+    EARLIEST_IN_MEMORY = 1;
+    LATEST = 2;
+}
+
 message PartitionOffset {
     Partition partition = 1;
-    int64 ts_ns = 2;
+    int64 start_ts_ns = 2;
+    int64 stop_ts_ns = 3;
+    PartitionOffsetStartType start_type = 4;
 }
 
 //////////////////////////////////////////////////

weed/server/filer_grpc_server_sub_meta.go

@@ -32,7 +32,7 @@ func (fs *FilerServer) SubscribeMetadata(req *filer_pb.SubscribeMetadataRequest,
 	}
 	defer fs.deleteClient("", clientName, req.ClientId, req.ClientEpoch)
 
-	lastReadTime := time.Unix(0, req.SinceNs)
+	lastReadTime := log_buffer.NewMessagePosition(req.SinceNs, -2)
 	glog.V(0).Infof(" %v starts to subscribe %s from %+v", clientName, req.PathPrefix, lastReadTime)
 
 	eachEventNotificationFn := fs.eachEventNotificationFn(req, stream, clientName)
@@ -57,12 +57,12 @@ func (fs *FilerServer) SubscribeMetadata(req *filer_pb.SubscribeMetadataRequest,
 		}
 
 		if processedTsNs != 0 {
-			lastReadTime = time.Unix(0, processedTsNs)
+			lastReadTime = log_buffer.NewMessagePosition(processedTsNs, -2)
 		}
 
 		glog.V(4).Infof("read in memory %v aggregated subscribe %s from %+v", clientName, req.PathPrefix, lastReadTime)
 
-		lastReadTime, isDone, readInMemoryLogErr = fs.filer.MetaAggregator.MetaLogBuffer.LoopProcessLogData("aggMeta:"+clientName, lastReadTime, req.UntilNs, func() bool {
+		lastReadTime, isDone, readInMemoryLogErr = fs.filer.MetaAggregator.MetaLogBuffer.LoopProcessLogData("aggMeta:"+clientName, lastReadTime, false, req.UntilNs, func() bool {
 			fs.filer.MetaAggregator.ListenersLock.Lock()
 			fs.filer.MetaAggregator.ListenersCond.Wait()
 			fs.filer.MetaAggregator.ListenersLock.Unlock()
@@ -113,7 +113,7 @@ func (fs *FilerServer) SubscribeLocalMetadata(req *filer_pb.SubscribeMetadataReq
 		fs.deleteClient("local", clientName, req.ClientId, req.ClientEpoch)
 	}()
 
-	lastReadTime := time.Unix(0, req.SinceNs)
+	lastReadTime := log_buffer.NewMessagePosition(req.SinceNs, -2)
 	glog.V(0).Infof(" + %v local subscribe %s from %+v clientId:%d", clientName, req.PathPrefix, lastReadTime, req.ClientId)
 
 	eachEventNotificationFn := fs.eachEventNotificationFn(req, stream, clientName)
@@ -138,7 +138,7 @@ func (fs *FilerServer) SubscribeLocalMetadata(req *filer_pb.SubscribeMetadataReq
 		}
 
 		if processedTsNs != 0 {
-			lastReadTime = time.Unix(0, processedTsNs)
+			lastReadTime = log_buffer.NewMessagePosition(processedTsNs, -2)
 		} else {
 			if readInMemoryLogErr == log_buffer.ResumeFromDiskError {
 				time.Sleep(1127 * time.Millisecond)
@@ -148,7 +148,7 @@ func (fs *FilerServer) SubscribeLocalMetadata(req *filer_pb.SubscribeMetadataReq
 
 		glog.V(0).Infof("read in memory %v local subscribe %s from %+v", clientName, req.PathPrefix, lastReadTime)
 
-		lastReadTime, isDone, readInMemoryLogErr = fs.filer.LocalMetaLogBuffer.LoopProcessLogData("localMeta:"+clientName, lastReadTime, req.UntilNs, func() bool {
+		lastReadTime, isDone, readInMemoryLogErr = fs.filer.LocalMetaLogBuffer.LoopProcessLogData("localMeta:"+clientName, lastReadTime, false, req.UntilNs, func() bool {
 			fs.listenersLock.Lock()
 			fs.listenersCond.Wait()
 			fs.listenersLock.Unlock()

weed/util/log_buffer/log_buffer.go

@@ -26,6 +26,7 @@ type LogBuffer struct {
 	name          string
 	prevBuffers   *SealedBuffers
 	buf           []byte
+	batchIndex    int64
 	idx           []int
 	pos           int
 	startTime     time.Time
@@ -58,17 +59,17 @@ func NewLogBuffer(name string, flushInterval time.Duration, flushFn func(startTi
 	return lb
 }
 
-func (m *LogBuffer) AddToBuffer(partitionKey, data []byte, processingTsNs int64) {
+func (logBuffer *LogBuffer) AddToBuffer(partitionKey, data []byte, processingTsNs int64) {
 
 	var toFlush *dataToFlush
-	m.Lock()
+	logBuffer.Lock()
 	defer func() {
-		m.Unlock()
+		logBuffer.Unlock()
 		if toFlush != nil {
-			m.flushChan <- toFlush
+			logBuffer.flushChan <- toFlush
 		}
-		if m.notifyFn != nil {
+		if logBuffer.notifyFn != nil {
-			m.notifyFn()
+			logBuffer.notifyFn()
 		}
 	}()
 
@@ -80,12 +81,12 @@ func (m *LogBuffer) AddToBuffer(partitionKey, data []byte, processingTsNs int64)
 	} else {
 		ts = time.Unix(0, processingTsNs)
 	}
-	if m.lastTsNs >= processingTsNs {
+	if logBuffer.lastTsNs >= processingTsNs {
 		// this is unlikely to happen, but just in case
-		processingTsNs = m.lastTsNs + 1
+		processingTsNs = logBuffer.lastTsNs + 1
 		ts = time.Unix(0, processingTsNs)
 	}
-	m.lastTsNs = processingTsNs
+	logBuffer.lastTsNs = processingTsNs
 	logEntry := &filer_pb.LogEntry{
 		TsNs:             processingTsNs,
 		PartitionKeyHash: util.HashToInt32(partitionKey),
@@ -96,108 +97,119 @@ func (m *LogBuffer) AddToBuffer(partitionKey, data []byte, processingTsNs int64)
 
 	size := len(logEntryData)
 
-	if m.pos == 0 {
+	if logBuffer.pos == 0 {
-		m.startTime = ts
+		logBuffer.startTime = ts
 	}
 
-	if m.startTime.Add(m.flushInterval).Before(ts) || len(m.buf)-m.pos < size+4 {
+	if logBuffer.startTime.Add(logBuffer.flushInterval).Before(ts) || len(logBuffer.buf)-logBuffer.pos < size+4 {
-		// glog.V(4).Infof("%s copyToFlush1 start time %v, ts %v, remaining %d bytes", m.name, m.startTime, ts, len(m.buf)-m.pos)
+		glog.V(0).Infof("%s copyToFlush1 batch:%d start time %v, ts %v, remaining %d bytes", logBuffer.name, logBuffer.batchIndex, logBuffer.startTime, ts, len(logBuffer.buf)-logBuffer.pos)
-		toFlush = m.copyToFlush()
+		toFlush = logBuffer.copyToFlush()
-		m.startTime = ts
+		logBuffer.startTime = ts
-		if len(m.buf) < size+4 {
+		if len(logBuffer.buf) < size+4 {
-			m.buf = make([]byte, 2*size+4)
+			logBuffer.buf = make([]byte, 2*size+4)
 		}
 	}
-	m.stopTime = ts
+	logBuffer.stopTime = ts
 
-	m.idx = append(m.idx, m.pos)
+	logBuffer.idx = append(logBuffer.idx, logBuffer.pos)
-	util.Uint32toBytes(m.sizeBuf, uint32(size))
+	util.Uint32toBytes(logBuffer.sizeBuf, uint32(size))
-	copy(m.buf[m.pos:m.pos+4], m.sizeBuf)
+	copy(logBuffer.buf[logBuffer.pos:logBuffer.pos+4], logBuffer.sizeBuf)
-	copy(m.buf[m.pos+4:m.pos+4+size], logEntryData)
+	copy(logBuffer.buf[logBuffer.pos+4:logBuffer.pos+4+size], logEntryData)
-	m.pos += size + 4
+	logBuffer.pos += size + 4
 
 	// fmt.Printf("partitionKey %v entry size %d total %d count %d\n", string(partitionKey), size, m.pos, len(m.idx))
 
 }
 
-func (m *LogBuffer) IsStopping() bool {
+func (logBuffer *LogBuffer) IsStopping() bool {
-	return m.isStopping.Load()
+	return logBuffer.isStopping.Load()
 }
 
-func (m *LogBuffer) Shutdown() {
+func (logBuffer *LogBuffer) Shutdown() {
-	isAlreadyStopped := m.isStopping.Swap(true)
+	isAlreadyStopped := logBuffer.isStopping.Swap(true)
 	if isAlreadyStopped {
 		return
 	}
-	toFlush := m.copyToFlush()
+	toFlush := logBuffer.copyToFlush()
-	m.flushChan <- toFlush
+	logBuffer.flushChan <- toFlush
-	close(m.flushChan)
+	close(logBuffer.flushChan)
 }
 
-func (m *LogBuffer) loopFlush() {
+func (logBuffer *LogBuffer) loopFlush() {
-	for d := range m.flushChan {
+	for d := range logBuffer.flushChan {
 		if d != nil {
 			// glog.V(4).Infof("%s flush [%v, %v] size %d", m.name, d.startTime, d.stopTime, len(d.data.Bytes()))
-			m.flushFn(d.startTime, d.stopTime, d.data.Bytes())
+			logBuffer.flushFn(d.startTime, d.stopTime, d.data.Bytes())
 			d.releaseMemory()
 			// local logbuffer is different from aggregate logbuffer here
-			m.lastFlushTime = d.stopTime
+			logBuffer.lastFlushTime = d.stopTime
 		}
 	}
 }
 
-func (m *LogBuffer) loopInterval() {
+func (logBuffer *LogBuffer) loopInterval() {
-	for !m.IsStopping() {
+	for !logBuffer.IsStopping() {
-		time.Sleep(m.flushInterval)
+		time.Sleep(logBuffer.flushInterval)
-		if m.IsStopping() {
+		if logBuffer.IsStopping() {
 			return
 		}
-		m.Lock()
+		logBuffer.Lock()
-		toFlush := m.copyToFlush()
+		toFlush := logBuffer.copyToFlush()
-		m.Unlock()
+		logBuffer.Unlock()
 		if toFlush != nil {
-			glog.V(0).Infof("%s flush [%v, %v] size %d", m.name, toFlush.startTime, toFlush.stopTime, len(toFlush.data.Bytes()))
+			glog.V(0).Infof("%s flush [%v, %v] size %d", logBuffer.name, toFlush.startTime, toFlush.stopTime, len(toFlush.data.Bytes()))
-			m.flushChan <- toFlush
+			logBuffer.flushChan <- toFlush
 		} else {
 			// glog.V(0).Infof("%s no flush", m.name)
 		}
 	}
 }
 
-func (m *LogBuffer) copyToFlush() *dataToFlush {
+func (logBuffer *LogBuffer) copyToFlush() *dataToFlush {
 
-	if m.pos > 0 {
+	if logBuffer.pos > 0 {
 		// fmt.Printf("flush buffer %d pos %d empty space %d\n", len(m.buf), m.pos, len(m.buf)-m.pos)
 		var d *dataToFlush
-		if m.flushFn != nil {
+		if logBuffer.flushFn != nil {
 			d = &dataToFlush{
-				startTime: m.startTime,
+				startTime: logBuffer.startTime,
-				stopTime:  m.stopTime,
+				stopTime:  logBuffer.stopTime,
-				data:      copiedBytes(m.buf[:m.pos]),
+				data:      copiedBytes(logBuffer.buf[:logBuffer.pos]),
 			}
 			// glog.V(4).Infof("%s flushing [0,%d) with %d entries [%v, %v]", m.name, m.pos, len(m.idx), m.startTime, m.stopTime)
 		} else {
 			// glog.V(4).Infof("%s removed from memory [0,%d) with %d entries [%v, %v]", m.name, m.pos, len(m.idx), m.startTime, m.stopTime)
-			m.lastFlushTime = m.stopTime
+			logBuffer.lastFlushTime = logBuffer.stopTime
 		}
-		m.buf = m.prevBuffers.SealBuffer(m.startTime, m.stopTime, m.buf, m.pos)
+		logBuffer.buf = logBuffer.prevBuffers.SealBuffer(logBuffer.startTime, logBuffer.stopTime, logBuffer.buf, logBuffer.pos, logBuffer.batchIndex)
-		m.startTime = time.Unix(0, 0)
+		logBuffer.startTime = time.Unix(0, 0)
-		m.stopTime = time.Unix(0, 0)
+		logBuffer.stopTime = time.Unix(0, 0)
-		m.pos = 0
+		logBuffer.pos = 0
-		m.idx = m.idx[:0]
+		logBuffer.idx = logBuffer.idx[:0]
+		logBuffer.batchIndex++
 		return d
 	}
 	return nil
 }
 
+func (logBuffer *LogBuffer) GetEarliestTime() time.Time{
+	return logBuffer.startTime
+}
+func (logBuffer *LogBuffer) GetEarliestPosition() MessagePosition{
+	return MessagePosition{
+		Time:       logBuffer.startTime,
+		BatchIndex: logBuffer.batchIndex,
+	}
+}
+
 func (d *dataToFlush) releaseMemory() {
 	d.data.Reset()
 	bufferPool.Put(d.data)
 }
 
-func (m *LogBuffer) ReadFromBuffer(lastReadTime time.Time) (bufferCopy *bytes.Buffer, err error) {
+func (logBuffer *LogBuffer) ReadFromBuffer(lastReadPosition MessagePosition, inMemoryOnly bool) (bufferCopy *bytes.Buffer, batchIndex int64, err error) {
-	m.RLock()
+	logBuffer.RLock()
-	defer m.RUnlock()
+	defer logBuffer.RUnlock()
 
 	// Read from disk and memory
 	//	1. read from disk, last time is = td
@@ -209,52 +221,61 @@ func (m *LogBuffer) ReadFromBuffer(lastReadTime time.Time) (bufferCopy *bytes.Bu
 	//	if td < tm, case 2.3
 	//		read from disk again
 	var tsMemory time.Time
-	if !m.startTime.IsZero() {
+	var tsBatchIndex int64
-		tsMemory = m.startTime
+	if !logBuffer.startTime.IsZero() {
+		tsMemory = logBuffer.startTime
+		tsBatchIndex = logBuffer.batchIndex
 	}
-	for _, prevBuf := range m.prevBuffers.buffers {
+	for _, prevBuf := range logBuffer.prevBuffers.buffers {
 		if !prevBuf.startTime.IsZero() && prevBuf.startTime.Before(tsMemory) {
 			tsMemory = prevBuf.startTime
+			tsBatchIndex = prevBuf.batchIndex
 		}
 	}
 	if tsMemory.IsZero() { // case 2.2
-		return nil, nil
+		println("2.2 no data")
-	} else if lastReadTime.Before(tsMemory) { // case 2.3
+		return nil, -2,nil
-		if !m.lastFlushTime.IsZero() {
+	} else if lastReadPosition.Before(tsMemory) && lastReadPosition.BatchIndex +1 < tsBatchIndex { // case 2.3
-			glog.V(0).Infof("resume with last flush time: %v", m.lastFlushTime)
+		if inMemoryOnly {
-			return nil, ResumeFromDiskError
+			println("2.3 no data", lastReadPosition.BatchIndex, tsBatchIndex)
+			// FIXME: this is wrong: the data has been flushed to disk already
+			return nil, tsBatchIndex,nil
+		}
+		if !logBuffer.lastFlushTime.IsZero() {
+			glog.V(0).Infof("resume with last flush time: %v", logBuffer.lastFlushTime)
+			return nil, -2, ResumeFromDiskError
 		}
 	}
 
 	// the following is case 2.1
 
-	if lastReadTime.Equal(m.stopTime) {
+	if lastReadPosition.Equal(logBuffer.stopTime) {
-		return nil, nil
+		return nil, logBuffer.batchIndex, nil
 	}
-	if lastReadTime.After(m.stopTime) {
+	if lastReadPosition.After(logBuffer.stopTime) {
-		// glog.Fatalf("unexpected last read time %v, older than latest %v", lastReadTime, m.stopTime)
+		// glog.Fatalf("unexpected last read time %v, older than latest %v", lastReadPosition, m.stopTime)
-		return nil, nil
+		return nil, logBuffer.batchIndex, nil
 	}
-	if lastReadTime.Before(m.startTime) {
+	if lastReadPosition.Before(logBuffer.startTime) {
-		// println("checking ", lastReadTime.UnixNano())
+		// println("checking ", lastReadPosition.UnixNano())
-		for _, buf := range m.prevBuffers.buffers {
+		for _, buf := range logBuffer.prevBuffers.buffers {
-			if buf.startTime.After(lastReadTime) {
+			if buf.startTime.After(lastReadPosition.Time) {
 				// glog.V(4).Infof("%s return the %d sealed buffer %v", m.name, i, buf.startTime)
 				// println("return the", i, "th in memory", buf.startTime.UnixNano())
-				return copiedBytes(buf.buf[:buf.size]), nil
+				return copiedBytes(buf.buf[:buf.size]), buf.batchIndex, nil
 			}
-			if !buf.startTime.After(lastReadTime) && buf.stopTime.After(lastReadTime) {
+			if !buf.startTime.After(lastReadPosition.Time) && buf.stopTime.After(lastReadPosition.Time) {
-				pos := buf.locateByTs(lastReadTime)
+				pos := buf.locateByTs(lastReadPosition.Time)
 				// fmt.Printf("locate buffer[%d] pos %d\n", i, pos)
-				return copiedBytes(buf.buf[pos:buf.size]), nil
+				return copiedBytes(buf.buf[pos:buf.size]), buf.batchIndex, nil
 			}
 		}
-		// glog.V(4).Infof("%s return the current buf %v", m.name, lastReadTime)
+		// glog.V(4).Infof("%s return the current buf %v", m.name, lastReadPosition)
-		return copiedBytes(m.buf[:m.pos]), nil
+		return copiedBytes(logBuffer.buf[:logBuffer.pos]), logBuffer.batchIndex,nil
 	}
 
-	lastTs := lastReadTime.UnixNano()
+	lastTs := lastReadPosition.UnixNano()
-	l, h := 0, len(m.idx)-1
+	l, h := 0, len(logBuffer.idx)-1
 
 	/*
 		for i, pos := range m.idx {
@@ -272,18 +293,18 @@ func (m *LogBuffer) ReadFromBuffer(lastReadTime time.Time) (bufferCopy *bytes.Bu
 
 	for l <= h {
 		mid := (l + h) / 2
-		pos := m.idx[mid]
+		pos := logBuffer.idx[mid]
-		_, t := readTs(m.buf, pos)
+		_, t := readTs(logBuffer.buf, pos)
 		if t <= lastTs {
 			l = mid + 1
 		} else if lastTs < t {
 			var prevT int64
 			if mid > 0 {
-				_, prevT = readTs(m.buf, m.idx[mid-1])
+				_, prevT = readTs(logBuffer.buf, logBuffer.idx[mid-1])
 			}
 			if prevT <= lastTs {
 				// fmt.Printf("found l=%d, m-1=%d(ts=%d), m=%d(ts=%d), h=%d [%d, %d) \n", l, mid-1, prevT, mid, t, h, pos, m.pos)
-				return copiedBytes(m.buf[pos:m.pos]), nil
+				return copiedBytes(logBuffer.buf[pos:logBuffer.pos]), logBuffer.batchIndex, nil
 			}
 			h = mid
 		}
@@ -291,10 +312,11 @@ func (m *LogBuffer) ReadFromBuffer(lastReadTime time.Time) (bufferCopy *bytes.Bu
 	}
 
 	// FIXME: this could be that the buffer has been flushed already
-	return nil, nil
+	println("Not sure why no data", lastReadPosition.BatchIndex, tsBatchIndex)
+	return nil, -2, nil
 
 }
-func (m *LogBuffer) ReleaseMemory(b *bytes.Buffer) {
+func (logBuffer *LogBuffer) ReleaseMemory(b *bytes.Buffer) {
 	bufferPool.Put(b)
 }
 

weed/util/log_buffer/log_buffer_test.go

@@ -28,7 +28,7 @@ func TestNewLogBufferFirstBuffer(t *testing.T) {
 	wg.Add(1)
 	go func() {
 		defer wg.Done()
-		lastProcessedTime, isDone, err := lb.LoopProcessLogData("test", startTime, 0, func() bool {
+		lastProcessedTime, isDone, err := lb.LoopProcessLogData("test", startTime, false, 0, func() bool {
 			// stop if no more messages
 			return receivedMessageCount < messageCount
 		}, func(logEntry *filer_pb.LogEntry) error {

weed/util/log_buffer/log_read.go

@@ -17,11 +17,24 @@ var (
 	ResumeFromDiskError = fmt.Errorf("resumeFromDisk")
 )
 
-func (logBuffer *LogBuffer) LoopProcessLogData(readerName string, startReadTime time.Time, stopTsNs int64,
+type MessagePosition struct {
-	waitForDataFn func() bool, eachLogDataFn func(logEntry *filer_pb.LogEntry) error) (lastReadTime time.Time, isDone bool, err error) {
+	time.Time // this is the timestamp of the message
+	BatchIndex int64 // this is only used when the timestamp is not enough to identify the next message, when the timestamp is in the previous batch.
+}
+
+func NewMessagePosition(tsNs int64, batchIndex int64) MessagePosition {
+	return MessagePosition{
+		Time:       time.Unix(0, tsNs).UTC(),
+		BatchIndex: batchIndex,
+	}
+}
+
+func (logBuffer *LogBuffer) LoopProcessLogData(readerName string, startPosition MessagePosition, inMemoryOnly bool, stopTsNs int64,
+	waitForDataFn func() bool, eachLogDataFn func(logEntry *filer_pb.LogEntry) error) (lastReadPosition MessagePosition, isDone bool, err error) {
 	// loop through all messages
 	var bytesBuf *bytes.Buffer
-	lastReadTime = startReadTime
+	var batchIndex int64
+	lastReadPosition = startPosition
 	defer func() {
 		if bytesBuf != nil {
 			logBuffer.ReleaseMemory(bytesBuf)
@@ -33,13 +46,20 @@ func (logBuffer *LogBuffer) LoopProcessLogData(readerName string, startReadTime
 		if bytesBuf != nil {
 			logBuffer.ReleaseMemory(bytesBuf)
 		}
-		bytesBuf, err = logBuffer.ReadFromBuffer(lastReadTime)
+		bytesBuf, batchIndex, err = logBuffer.ReadFromBuffer(lastReadPosition, inMemoryOnly)
 		if err == ResumeFromDiskError {
 			time.Sleep(1127 * time.Millisecond)
-			return lastReadTime, isDone, ResumeFromDiskError
+			return lastReadPosition, isDone, ResumeFromDiskError
 		}
-		// glog.V(4).Infof("%s ReadFromBuffer by %v", readerName, lastReadTime)
+		readSize := 0
+		if bytesBuf != nil {
+			readSize = bytesBuf.Len()
+		}
+		glog.V(0).Infof("%s ReadFromBuffer at %v batch:%d, read size:%v batch:%d", readerName, lastReadPosition, lastReadPosition.BatchIndex, readSize, batchIndex)
 		if bytesBuf == nil {
+			if batchIndex >= 0 {
+				lastReadPosition = NewMessagePosition(lastReadPosition.UnixNano(), batchIndex)
+			}
 			if stopTsNs != 0 {
 				isDone = true
 				return
@@ -52,7 +72,7 @@ func (logBuffer *LogBuffer) LoopProcessLogData(readerName string, startReadTime
 		}
 
 		buf := bytesBuf.Bytes()
-		// fmt.Printf("ReadFromBuffer %s by %v size %d\n", readerName, lastReadTime, len(buf))
+		// fmt.Printf("ReadFromBuffer %s by %v size %d\n", readerName, lastReadPosition, len(buf))
 
 		batchSize := 0
 
@@ -61,7 +81,7 @@ func (logBuffer *LogBuffer) LoopProcessLogData(readerName string, startReadTime
 			size := util.BytesToUint32(buf[pos : pos+4])
 			if pos+4+int(size) > len(buf) {
 				err = ResumeError
-				glog.Errorf("LoopProcessLogData: %s read buffer %v read %d [%d,%d) from [0,%d)", readerName, lastReadTime, batchSize, pos, pos+int(size)+4, len(buf))
+				glog.Errorf("LoopProcessLogData: %s read buffer %v read %d [%d,%d) from [0,%d)", readerName, lastReadPosition, batchSize, pos, pos+int(size)+4, len(buf))
 				return
 			}
 			entryData := buf[pos+4 : pos+4+int(size)]
@@ -76,7 +96,7 @@ func (logBuffer *LogBuffer) LoopProcessLogData(readerName string, startReadTime
 				isDone = true
 				return
 			}
-			lastReadTime = time.Unix(0, logEntry.TsNs)
+			lastReadPosition = NewMessagePosition(logEntry.TsNs, batchIndex)
 
 			if err = eachLogDataFn(logEntry); err != nil {
 				return
@@ -87,7 +107,7 @@ func (logBuffer *LogBuffer) LoopProcessLogData(readerName string, startReadTime
 
 		}
 
-		// glog.V(4).Infof("%s sent messages ts[%+v,%+v] size %d\n", readerName, startReadTime, lastReadTime, batchSize)
+		// glog.V(4).Infof("%s sent messages ts[%+v,%+v] size %d\n", readerName, startReadTime, lastReadPosition, batchSize)
 	}
 
 }

weed/util/log_buffer/sealed_buffer.go

@@ -10,6 +10,7 @@ type MemBuffer struct {
 	size      int
 	startTime time.Time
 	stopTime  time.Time
+	batchIndex int64
 }
 
 type SealedBuffers struct {
@@ -29,7 +30,7 @@ func newSealedBuffers(size int) *SealedBuffers {
 	return sbs
 }
 
-func (sbs *SealedBuffers) SealBuffer(startTime, stopTime time.Time, buf []byte, pos int) (newBuf []byte) {
+func (sbs *SealedBuffers) SealBuffer(startTime, stopTime time.Time, buf []byte, pos int, batchIndex int64) (newBuf []byte) {
 	oldMemBuffer := sbs.buffers[0]
 	size := len(sbs.buffers)
 	for i := 0; i < size-1; i++ {
@@ -37,11 +38,13 @@ func (sbs *SealedBuffers) SealBuffer(startTime, stopTime time.Time, buf []byte,
 		sbs.buffers[i].size = sbs.buffers[i+1].size
 		sbs.buffers[i].startTime = sbs.buffers[i+1].startTime
 		sbs.buffers[i].stopTime = sbs.buffers[i+1].stopTime
+		sbs.buffers[i].batchIndex = sbs.buffers[i+1].batchIndex
 	}
 	sbs.buffers[size-1].buf = buf
 	sbs.buffers[size-1].size = pos
 	sbs.buffers[size-1].startTime = startTime
 	sbs.buffers[size-1].stopTime = stopTime
+	sbs.buffers[size-1].batchIndex = batchIndex
 	return oldMemBuffer.buf
 }