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|
package page_writer
import (
"fmt"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/util"
"github.com/chrislusf/seaweedfs/weed/util/mem"
"sync"
"sync/atomic"
"time"
)
type LogicChunkIndex int
type UploadPipeline struct {
filepath util.FullPath
ChunkSize int64
writableChunks map[LogicChunkIndex]*MemChunk
writableChunksLock sync.Mutex
sealedChunks map[LogicChunkIndex]*SealedChunk
sealedChunksLock sync.Mutex
uploaders *util.LimitedConcurrentExecutor
uploaderCount int32
uploaderCountCond *sync.Cond
saveToStorageFn SaveToStorageFunc
activeReadChunks map[LogicChunkIndex]int
activeReadChunksLock sync.Mutex
}
type SealedChunk struct {
chunk *MemChunk
referenceCounter int // track uploading or reading processes
}
func (sc *SealedChunk) FreeReference(messageOnFree string) {
sc.referenceCounter--
if sc.referenceCounter == 0 {
glog.V(4).Infof("Free sealed chunk: %s", messageOnFree)
mem.Free(sc.chunk.buf)
}
}
func NewUploadPipeline(filepath util.FullPath, writers *util.LimitedConcurrentExecutor, chunkSize int64, saveToStorageFn SaveToStorageFunc) *UploadPipeline {
return &UploadPipeline{
ChunkSize: chunkSize,
writableChunks: make(map[LogicChunkIndex]*MemChunk),
sealedChunks: make(map[LogicChunkIndex]*SealedChunk),
uploaders: writers,
uploaderCountCond: sync.NewCond(&sync.Mutex{}),
saveToStorageFn: saveToStorageFn,
filepath: filepath,
activeReadChunks: make(map[LogicChunkIndex]int),
}
}
func (cw *UploadPipeline) SaveDataAt(p []byte, off int64) (n int) {
cw.writableChunksLock.Lock()
defer cw.writableChunksLock.Unlock()
logicChunkIndex := LogicChunkIndex(off / cw.ChunkSize)
offsetRemainder := off % cw.ChunkSize
memChunk, found := cw.writableChunks[logicChunkIndex]
if !found {
memChunk = &MemChunk{
buf: mem.Allocate(int(cw.ChunkSize)),
usage: newChunkWrittenIntervalList(),
}
cw.writableChunks[logicChunkIndex] = memChunk
}
n = copy(memChunk.buf[offsetRemainder:], p)
memChunk.usage.MarkWritten(offsetRemainder, offsetRemainder+int64(n))
cw.maybeMoveToSealed(memChunk, logicChunkIndex)
return
}
func (cw *UploadPipeline) MaybeReadDataAt(p []byte, off int64) (maxStop int64) {
logicChunkIndex := LogicChunkIndex(off / cw.ChunkSize)
// read from sealed chunks first
cw.sealedChunksLock.Lock()
sealedChunk, found := cw.sealedChunks[logicChunkIndex]
if found {
sealedChunk.referenceCounter++
}
cw.sealedChunksLock.Unlock()
if found {
maxStop = readMemChunk(sealedChunk.chunk, p, off, logicChunkIndex, cw.ChunkSize)
glog.V(4).Infof("%s read sealed memchunk [%d,%d)", cw.filepath, off, maxStop)
sealedChunk.FreeReference(fmt.Sprintf("%s finish reading chunk %d", cw.filepath, logicChunkIndex))
}
// read from writable chunks last
cw.writableChunksLock.Lock()
defer cw.writableChunksLock.Unlock()
writableChunk, found := cw.writableChunks[logicChunkIndex]
if !found {
return
}
writableMaxStop := readMemChunk(writableChunk, p, off, logicChunkIndex, cw.ChunkSize)
glog.V(4).Infof("%s read writable memchunk [%d,%d)", cw.filepath, off, writableMaxStop)
maxStop = max(maxStop, writableMaxStop)
return
}
func (cw *UploadPipeline) FlushAll() {
cw.writableChunksLock.Lock()
defer cw.writableChunksLock.Unlock()
for logicChunkIndex, memChunk := range cw.writableChunks {
cw.moveToSealed(memChunk, logicChunkIndex)
}
cw.waitForCurrentWritersToComplete()
}
func (cw *UploadPipeline) LockForRead(startOffset, stopOffset int64) {
startLogicChunkIndex := LogicChunkIndex(startOffset / cw.ChunkSize)
stopLogicChunkIndex := LogicChunkIndex(stopOffset / cw.ChunkSize)
if stopOffset%cw.ChunkSize > 0 {
stopLogicChunkIndex += 1
}
cw.activeReadChunksLock.Lock()
defer cw.activeReadChunksLock.Unlock()
for i := startLogicChunkIndex; i < stopLogicChunkIndex; i++ {
if count, found := cw.activeReadChunks[i]; found {
cw.activeReadChunks[i] = count + 1
} else {
cw.activeReadChunks[i] = 1
}
}
}
func (cw *UploadPipeline) UnlockForRead(startOffset, stopOffset int64) {
startLogicChunkIndex := LogicChunkIndex(startOffset / cw.ChunkSize)
stopLogicChunkIndex := LogicChunkIndex(stopOffset / cw.ChunkSize)
if stopOffset%cw.ChunkSize > 0 {
stopLogicChunkIndex += 1
}
cw.activeReadChunksLock.Lock()
defer cw.activeReadChunksLock.Unlock()
for i := startLogicChunkIndex; i < stopLogicChunkIndex; i++ {
if count, found := cw.activeReadChunks[i]; found {
if count == 1 {
delete(cw.activeReadChunks, i)
} else {
cw.activeReadChunks[i] = count - 1
}
}
}
}
func (cw *UploadPipeline) IsLocked(logicChunkIndex LogicChunkIndex) bool {
cw.activeReadChunksLock.Lock()
defer cw.activeReadChunksLock.Unlock()
if count, found := cw.activeReadChunks[logicChunkIndex]; found {
return count > 0
}
return false
}
func (cw *UploadPipeline) waitForCurrentWritersToComplete() {
cw.uploaderCountCond.L.Lock()
t := int32(100)
for {
t = atomic.LoadInt32(&cw.uploaderCount)
if t <= 0 {
break
}
cw.uploaderCountCond.Wait()
}
cw.uploaderCountCond.L.Unlock()
}
func (cw *UploadPipeline) maybeMoveToSealed(memChunk *MemChunk, logicChunkIndex LogicChunkIndex) {
if memChunk.usage.IsComplete(cw.ChunkSize) {
cw.moveToSealed(memChunk, logicChunkIndex)
}
}
func (cw *UploadPipeline) moveToSealed(memChunk *MemChunk, logicChunkIndex LogicChunkIndex) {
atomic.AddInt32(&cw.uploaderCount, 1)
glog.V(4).Infof("%s uploaderCount %d ++> %d", cw.filepath, cw.uploaderCount-1, cw.uploaderCount)
cw.sealedChunksLock.Lock()
if oldMemChunk, found := cw.sealedChunks[logicChunkIndex]; found {
oldMemChunk.FreeReference(fmt.Sprintf("%s replace chunk %d", cw.filepath, logicChunkIndex))
}
sealedChunk := &SealedChunk{
chunk: memChunk,
referenceCounter: 1, // default 1 is for uploading process
}
cw.sealedChunks[logicChunkIndex] = sealedChunk
delete(cw.writableChunks, logicChunkIndex)
cw.sealedChunksLock.Unlock()
cw.uploaders.Execute(func() {
// first add to the file chunks
cw.saveOneChunk(sealedChunk.chunk, logicChunkIndex)
// notify waiting process
atomic.AddInt32(&cw.uploaderCount, -1)
glog.V(4).Infof("%s uploaderCount %d --> %d", cw.filepath, cw.uploaderCount+1, cw.uploaderCount)
// Lock and Unlock are not required,
// but it may signal multiple times during one wakeup,
// and the waiting goroutine may miss some of them!
cw.uploaderCountCond.L.Lock()
cw.uploaderCountCond.Broadcast()
cw.uploaderCountCond.L.Unlock()
// wait for readers
for cw.IsLocked(logicChunkIndex) {
time.Sleep(59 * time.Millisecond)
}
// then remove from sealed chunks
cw.sealedChunksLock.Lock()
defer cw.sealedChunksLock.Unlock()
delete(cw.sealedChunks, logicChunkIndex)
sealedChunk.FreeReference(fmt.Sprintf("%s finished uploading chunk %d", cw.filepath, logicChunkIndex))
})
}
func (cw *UploadPipeline) saveOneChunk(memChunk *MemChunk, logicChunkIndex LogicChunkIndex) {
if cw.saveToStorageFn == nil {
return
}
for t := memChunk.usage.head.next; t != memChunk.usage.tail; t = t.next {
reader := util.NewBytesReader(memChunk.buf[t.StartOffset:t.stopOffset])
cw.saveToStorageFn(reader, int64(logicChunkIndex)*cw.ChunkSize+t.StartOffset, t.Size(), func() {
})
}
}
func readMemChunk(memChunk *MemChunk, p []byte, off int64, logicChunkIndex LogicChunkIndex, chunkSize int64) (maxStop int64) {
memChunkBaseOffset := int64(logicChunkIndex) * chunkSize
for t := memChunk.usage.head.next; t != memChunk.usage.tail; t = t.next {
logicStart := max(off, int64(logicChunkIndex)*chunkSize+t.StartOffset)
logicStop := min(off+int64(len(p)), memChunkBaseOffset+t.stopOffset)
if logicStart < logicStop {
copy(p[logicStart-off:logicStop-off], memChunk.buf[logicStart-memChunkBaseOffset:logicStop-memChunkBaseOffset])
maxStop = max(maxStop, logicStop)
}
}
return
}
func (p2 *UploadPipeline) Shutdown() {
}
|
