mount: adjust locking for upload pipeline

weed/mount/page_writer/upload_pipeline.go

@@ -6,26 +6,24 @@ import (
 	"github.com/seaweedfs/seaweedfs/weed/util"
 	"sync"
 	"sync/atomic"
-	"time"
 )
 
 type LogicChunkIndex int
 
 type UploadPipeline struct {
-	uploaderCount        int32
-	uploaderCountCond    *sync.Cond
-	filepath             util.FullPath
-	ChunkSize            int64
-	writableChunks       map[LogicChunkIndex]PageChunk
-	writableChunksLock   sync.Mutex
-	sealedChunks         map[LogicChunkIndex]*SealedChunk
-	sealedChunksLock     sync.Mutex
-	uploaders            *util.LimitedConcurrentExecutor
-	saveToStorageFn      SaveToStorageFunc
-	activeReadChunks     map[LogicChunkIndex]int
-	activeReadChunksLock sync.Mutex
-	writableChunkLimit   int
-	swapFile             *SwapFile
+	uploaderCount      int32
+	uploaderCountCond  *sync.Cond
+	filepath           util.FullPath
+	ChunkSize          int64
+	uploaders          *util.LimitedConcurrentExecutor
+	saveToStorageFn    SaveToStorageFunc
+	writableChunkLimit int
+	swapFile           *SwapFile
+	chunksLock         sync.Mutex
+	writableChunks     map[LogicChunkIndex]PageChunk
+	sealedChunks       map[LogicChunkIndex]*SealedChunk
+	activeReadChunks   map[LogicChunkIndex]int
+	readerCountCond    *sync.Cond
 }
 
 type SealedChunk struct {
@@ -42,7 +40,7 @@ func (sc *SealedChunk) FreeReference(messageOnFree string) {
 }
 
 func NewUploadPipeline(writers *util.LimitedConcurrentExecutor, chunkSize int64, saveToStorageFn SaveToStorageFunc, bufferChunkLimit int, swapFileDir string) *UploadPipeline {
-	return &UploadPipeline{
+	t := &UploadPipeline{
 		ChunkSize:          chunkSize,
 		writableChunks:     make(map[LogicChunkIndex]PageChunk),
 		sealedChunks:       make(map[LogicChunkIndex]*SealedChunk),
@@ -53,11 +51,13 @@ func NewUploadPipeline(writers *util.LimitedConcurrentExecutor, chunkSize int64,
 		writableChunkLimit: bufferChunkLimit,
 		swapFile:           NewSwapFile(swapFileDir, chunkSize),
 	}
+	t.readerCountCond = sync.NewCond(&t.chunksLock)
+	return t
 }
 
 func (up *UploadPipeline) SaveDataAt(p []byte, off int64, isSequential bool) (n int) {
-	up.writableChunksLock.Lock()
-	defer up.writableChunksLock.Unlock()
+	up.chunksLock.Lock()
+	defer up.chunksLock.Unlock()
 
 	logicChunkIndex := LogicChunkIndex(off / up.ChunkSize)
 
@@ -95,13 +95,17 @@ func (up *UploadPipeline) SaveDataAt(p []byte, off int64, isSequential bool) (n
 func (up *UploadPipeline) MaybeReadDataAt(p []byte, off int64) (maxStop int64) {
 	logicChunkIndex := LogicChunkIndex(off / up.ChunkSize)
 
+	up.chunksLock.Lock()
+	defer func() {
+		up.readerCountCond.Signal()
+		up.chunksLock.Unlock()
+	}()
+
 	// read from sealed chunks first
-	up.sealedChunksLock.Lock()
 	sealedChunk, found := up.sealedChunks[logicChunkIndex]
 	if found {
 		sealedChunk.referenceCounter++
 	}
-	up.sealedChunksLock.Unlock()
 	if found {
 		maxStop = sealedChunk.chunk.ReadDataAt(p, off)
 		glog.V(4).Infof("%s read sealed memchunk [%d,%d)", up.filepath, off, maxStop)
@@ -109,8 +113,6 @@ func (up *UploadPipeline) MaybeReadDataAt(p []byte, off int64) (maxStop int64) {
 	}
 
 	// read from writable chunks last
-	up.writableChunksLock.Lock()
-	defer up.writableChunksLock.Unlock()
 	writableChunk, found := up.writableChunks[logicChunkIndex]
 	if !found {
 		return
@@ -123,8 +125,8 @@ func (up *UploadPipeline) MaybeReadDataAt(p []byte, off int64) (maxStop int64) {
 }
 
 func (up *UploadPipeline) FlushAll() {
-	up.writableChunksLock.Lock()
-	defer up.writableChunksLock.Unlock()
+	up.chunksLock.Lock()
+	defer up.chunksLock.Unlock()
 
 	for logicChunkIndex, memChunk := range up.writableChunks {
 		up.moveToSealed(memChunk, logicChunkIndex)
@@ -143,8 +145,6 @@ func (up *UploadPipeline) moveToSealed(memChunk PageChunk, logicChunkIndex Logic
 	atomic.AddInt32(&up.uploaderCount, 1)
 	glog.V(4).Infof("%s uploaderCount %d ++> %d", up.filepath, up.uploaderCount-1, up.uploaderCount)
 
-	up.sealedChunksLock.Lock()
-
 	if oldMemChunk, found := up.sealedChunks[logicChunkIndex]; found {
 		oldMemChunk.FreeReference(fmt.Sprintf("%s replace chunk %d", up.filepath, logicChunkIndex))
 	}
@@ -155,8 +155,6 @@ func (up *UploadPipeline) moveToSealed(memChunk PageChunk, logicChunkIndex Logic
 	up.sealedChunks[logicChunkIndex] = sealedChunk
 	delete(up.writableChunks, logicChunkIndex)
 
-	up.sealedChunksLock.Unlock()
-
 	up.uploaders.Execute(func() {
 		// first add to the file chunks
 		sealedChunk.chunk.SaveContent(up.saveToStorageFn)
@@ -172,13 +170,13 @@ func (up *UploadPipeline) moveToSealed(memChunk PageChunk, logicChunkIndex Logic
 		up.uploaderCountCond.L.Unlock()
 
 		// wait for readers
+		up.chunksLock.Lock()
+		defer up.chunksLock.Unlock()
 		for up.IsLocked(logicChunkIndex) {
-			time.Sleep(59 * time.Millisecond)
+			up.readerCountCond.Wait()
 		}
 
 		// then remove from sealed chunks
-		up.sealedChunksLock.Lock()
-		defer up.sealedChunksLock.Unlock()
 		delete(up.sealedChunks, logicChunkIndex)
 		sealedChunk.FreeReference(fmt.Sprintf("%s finished uploading chunk %d", up.filepath, logicChunkIndex))
 
@@ -188,8 +186,8 @@ func (up *UploadPipeline) moveToSealed(memChunk PageChunk, logicChunkIndex Logic
 func (up *UploadPipeline) Shutdown() {
 	up.swapFile.FreeResource()
 
-	up.sealedChunksLock.Lock()
-	defer up.sealedChunksLock.Unlock()
+	up.chunksLock.Lock()
+	defer up.chunksLock.Unlock()
 	for logicChunkIndex, sealedChunk := range up.sealedChunks {
 		sealedChunk.FreeReference(fmt.Sprintf("%s uploadpipeline shutdown chunk %d", up.filepath, logicChunkIndex))
 	}

weed/mount/page_writer/upload_pipeline_lock.go

@@ -10,8 +10,6 @@ func (up *UploadPipeline) LockForRead(startOffset, stopOffset int64) {
 	if stopOffset%up.ChunkSize > 0 {
 		stopLogicChunkIndex += 1
 	}
-	up.activeReadChunksLock.Lock()
-	defer up.activeReadChunksLock.Unlock()
 	for i := startLogicChunkIndex; i < stopLogicChunkIndex; i++ {
 		if count, found := up.activeReadChunks[i]; found {
 			up.activeReadChunks[i] = count + 1
@@ -27,8 +25,6 @@ func (up *UploadPipeline) UnlockForRead(startOffset, stopOffset int64) {
 	if stopOffset%up.ChunkSize > 0 {
 		stopLogicChunkIndex += 1
 	}
-	up.activeReadChunksLock.Lock()
-	defer up.activeReadChunksLock.Unlock()
 	for i := startLogicChunkIndex; i < stopLogicChunkIndex; i++ {
 		if count, found := up.activeReadChunks[i]; found {
 			if count == 1 {
@@ -41,8 +37,6 @@ func (up *UploadPipeline) UnlockForRead(startOffset, stopOffset int64) {
 }
 
 func (up *UploadPipeline) IsLocked(logicChunkIndex LogicChunkIndex) bool {
-	up.activeReadChunksLock.Lock()
-	defer up.activeReadChunksLock.Unlock()
 	if count, found := up.activeReadChunks[logicChunkIndex]; found {
 		return count > 0
 	}