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package page_writer
import (
"fmt"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/util"
"sync"
"sync/atomic"
)
type LogicChunkIndex int
type UploadPipeline struct {
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 {
chunk PageChunk
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)
sc.chunk.FreeResource()
}
}
func NewUploadPipeline(writers *util.LimitedConcurrentExecutor, chunkSize int64, saveToStorageFn SaveToStorageFunc, bufferChunkLimit int, swapFileDir string) *UploadPipeline {
t := &UploadPipeline{
ChunkSize: chunkSize,
writableChunks: make(map[LogicChunkIndex]PageChunk),
sealedChunks: make(map[LogicChunkIndex]*SealedChunk),
uploaders: writers,
uploaderCountCond: sync.NewCond(&sync.Mutex{}),
saveToStorageFn: saveToStorageFn,
activeReadChunks: make(map[LogicChunkIndex]int),
writableChunkLimit: bufferChunkLimit,
swapFile: NewSwapFile(swapFileDir, chunkSize),
}
t.readerCountCond = sync.NewCond(&t.chunksLock)
return t
}
func (up *UploadPipeline) SaveDataAt(p []byte, off int64, isSequential bool, tsNs int64) (n int) {
up.chunksLock.Lock()
defer up.chunksLock.Unlock()
logicChunkIndex := LogicChunkIndex(off / up.ChunkSize)
pageChunk, found := up.writableChunks[logicChunkIndex]
if !found {
if len(up.writableChunks) > up.writableChunkLimit {
// if current file chunks is over the per file buffer count limit
candidateChunkIndex, fullness := LogicChunkIndex(-1), int64(0)
for lci, mc := range up.writableChunks {
chunkFullness := mc.WrittenSize()
if fullness < chunkFullness {
candidateChunkIndex = lci
fullness = chunkFullness
}
}
/* // this algo generates too many chunks
candidateChunkIndex, lowestActivityScore := LogicChunkIndex(-1), int64(math.MaxInt64)
for wci, wc := range up.writableChunks {
activityScore := wc.ActivityScore()
if lowestActivityScore >= activityScore {
if lowestActivityScore == activityScore {
chunkFullness := wc.WrittenSize()
if fullness < chunkFullness {
candidateChunkIndex = lci
fullness = chunkFullness
}
}
candidateChunkIndex = wci
lowestActivityScore = activityScore
}
}
*/
up.moveToSealed(up.writableChunks[candidateChunkIndex], candidateChunkIndex)
// fmt.Printf("flush chunk %d with %d bytes written\n", logicChunkIndex, fullness)
}
// fmt.Printf("isSequential:%v len(up.writableChunks):%v memChunkCounter:%v", isSequential, len(up.writableChunks), memChunkCounter)
if isSequential &&
len(up.writableChunks) < up.writableChunkLimit &&
atomic.LoadInt64(&memChunkCounter) < 4*int64(up.writableChunkLimit) {
pageChunk = NewMemChunk(logicChunkIndex, up.ChunkSize)
// fmt.Printf(" create mem chunk %d\n", logicChunkIndex)
} else {
pageChunk = up.swapFile.NewSwapFileChunk(logicChunkIndex)
// fmt.Printf(" create file chunk %d\n", logicChunkIndex)
}
up.writableChunks[logicChunkIndex] = pageChunk
}
//if _, foundSealed := up.sealedChunks[logicChunkIndex]; foundSealed {
// println("found already sealed chunk", logicChunkIndex)
//}
//if _, foundReading := up.activeReadChunks[logicChunkIndex]; foundReading {
// println("found active read chunk", logicChunkIndex)
//}
n = pageChunk.WriteDataAt(p, off, tsNs)
up.maybeMoveToSealed(pageChunk, logicChunkIndex)
return
}
func (up *UploadPipeline) MaybeReadDataAt(p []byte, off int64, tsNs int64) (maxStop int64) {
logicChunkIndex := LogicChunkIndex(off / up.ChunkSize)
up.chunksLock.Lock()
defer func() {
up.readerCountCond.Signal()
up.chunksLock.Unlock()
}()
// read from sealed chunks first
sealedChunk, found := up.sealedChunks[logicChunkIndex]
if found {
maxStop = sealedChunk.chunk.ReadDataAt(p, off, tsNs)
glog.V(4).Infof("%s read sealed memchunk [%d,%d)", up.filepath, off, maxStop)
}
// read from writable chunks last
writableChunk, found := up.writableChunks[logicChunkIndex]
if !found {
return
}
writableMaxStop := writableChunk.ReadDataAt(p, off, tsNs)
glog.V(4).Infof("%s read writable memchunk [%d,%d)", up.filepath, off, writableMaxStop)
maxStop = max(maxStop, writableMaxStop)
return
}
func (up *UploadPipeline) FlushAll() {
up.flushChunks()
up.waitForCurrentWritersToComplete()
}
func (up *UploadPipeline) flushChunks() {
up.chunksLock.Lock()
defer up.chunksLock.Unlock()
for logicChunkIndex, memChunk := range up.writableChunks {
up.moveToSealed(memChunk, logicChunkIndex)
}
}
func (up *UploadPipeline) maybeMoveToSealed(memChunk PageChunk, logicChunkIndex LogicChunkIndex) {
if memChunk.IsComplete() {
up.moveToSealed(memChunk, logicChunkIndex)
}
}
func (up *UploadPipeline) moveToSealed(memChunk PageChunk, logicChunkIndex LogicChunkIndex) {
atomic.AddInt32(&up.uploaderCount, 1)
glog.V(4).Infof("%s uploaderCount %d ++> %d", up.filepath, up.uploaderCount-1, up.uploaderCount)
if oldMemChunk, found := up.sealedChunks[logicChunkIndex]; found {
oldMemChunk.FreeReference(fmt.Sprintf("%s replace chunk %d", up.filepath, logicChunkIndex))
}
sealedChunk := &SealedChunk{
chunk: memChunk,
referenceCounter: 1, // default 1 is for uploading process
}
up.sealedChunks[logicChunkIndex] = sealedChunk
delete(up.writableChunks, logicChunkIndex)
// unlock before submitting the uploading jobs
up.chunksLock.Unlock()
up.uploaders.Execute(func() {
// first add to the file chunks
sealedChunk.chunk.SaveContent(up.saveToStorageFn)
// notify waiting process
atomic.AddInt32(&up.uploaderCount, -1)
glog.V(4).Infof("%s uploaderCount %d --> %d", up.filepath, up.uploaderCount+1, up.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!
up.uploaderCountCond.L.Lock()
up.uploaderCountCond.Broadcast()
up.uploaderCountCond.L.Unlock()
// wait for readers
up.chunksLock.Lock()
defer up.chunksLock.Unlock()
for up.IsLocked(logicChunkIndex) {
up.readerCountCond.Wait()
}
// then remove from sealed chunks
delete(up.sealedChunks, logicChunkIndex)
sealedChunk.FreeReference(fmt.Sprintf("%s finished uploading chunk %d", up.filepath, logicChunkIndex))
})
up.chunksLock.Lock()
}
func (up *UploadPipeline) Shutdown() {
up.swapFile.FreeResource()
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))
}
}
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