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volume_vacuum.go
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volume_vacuum.go
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package storage
import (
"fmt"
"os"
"time"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/stats"
idx2 "github.com/chrislusf/seaweedfs/weed/storage/idx"
"github.com/chrislusf/seaweedfs/weed/storage/needle"
"github.com/chrislusf/seaweedfs/weed/storage/needle_map"
. "github.com/chrislusf/seaweedfs/weed/storage/types"
"github.com/chrislusf/seaweedfs/weed/util"
)
func (v *Volume) garbageLevel() float64 {
if v.ContentSize() == 0 {
return 0
}
return float64(v.nm.DeletedSize()) / float64(v.ContentSize())
}
func (v *Volume) Compact(preallocate int64, compactionBytePerSecond int64) error {
glog.V(3).Infof("Compacting volume %d ...", v.Id)
//no need to lock for copy on write
//v.accessLock.Lock()
//defer v.accessLock.Unlock()
//glog.V(3).Infof("Got Compaction lock...")
filePath := v.FileName()
v.lastCompactIndexOffset = v.nm.IndexFileSize()
v.lastCompactRevision = v.SuperBlock.CompactionRevision
glog.V(3).Infof("creating copies for volume %d ,last offset %d...", v.Id, v.lastCompactIndexOffset)
return v.copyDataAndGenerateIndexFile(filePath+".cpd", filePath+".cpx", preallocate, compactionBytePerSecond)
}
func (v *Volume) Compact2() error {
glog.V(3).Infof("Compact2 volume %d ...", v.Id)
filePath := v.FileName()
glog.V(3).Infof("creating copies for volume %d ...", v.Id)
return v.copyDataBasedOnIndexFile(filePath+".cpd", filePath+".cpx")
}
func (v *Volume) CommitCompact() error {
glog.V(0).Infof("Committing volume %d vacuuming...", v.Id)
v.dataFileAccessLock.Lock()
defer v.dataFileAccessLock.Unlock()
glog.V(3).Infof("Got volume %d committing lock...", v.Id)
v.nm.Close()
if err := v.dataFile.Close(); err != nil {
glog.V(0).Infof("fail to close volume %d", v.Id)
}
v.dataFile = nil
stats.VolumeServerVolumeCounter.WithLabelValues(v.Collection, "volume").Dec()
var e error
if e = v.makeupDiff(v.FileName()+".cpd", v.FileName()+".cpx", v.FileName()+".dat", v.FileName()+".idx"); e != nil {
glog.V(0).Infof("makeupDiff in CommitCompact volume %d failed %v", v.Id, e)
e = os.Remove(v.FileName() + ".cpd")
if e != nil {
return e
}
e = os.Remove(v.FileName() + ".cpx")
if e != nil {
return e
}
} else {
var e error
if e = os.Rename(v.FileName()+".cpd", v.FileName()+".dat"); e != nil {
return fmt.Errorf("rename %s: %v", v.FileName()+".cpd", e)
}
if e = os.Rename(v.FileName()+".cpx", v.FileName()+".idx"); e != nil {
return fmt.Errorf("rename %s: %v", v.FileName()+".cpx", e)
}
}
//glog.V(3).Infof("Pretending to be vacuuming...")
//time.Sleep(20 * time.Second)
os.RemoveAll(v.FileName() + ".ldb")
os.RemoveAll(v.FileName() + ".bdb")
glog.V(3).Infof("Loading volume %d commit file...", v.Id)
if e = v.load(true, false, v.needleMapKind, 0); e != nil {
return e
}
return nil
}
func (v *Volume) cleanupCompact() error {
glog.V(0).Infof("Cleaning up volume %d vacuuming...", v.Id)
e1 := os.Remove(v.FileName() + ".cpd")
e2 := os.Remove(v.FileName() + ".cpx")
if e1 != nil {
return e1
}
if e2 != nil {
return e2
}
return nil
}
func fetchCompactRevisionFromDatFile(file *os.File) (compactRevision uint16, err error) {
superBlock, err := ReadSuperBlock(file)
if err != nil {
return 0, err
}
return superBlock.CompactionRevision, nil
}
func (v *Volume) makeupDiff(newDatFileName, newIdxFileName, oldDatFileName, oldIdxFileName string) (err error) {
var indexSize int64
oldIdxFile, err := os.Open(oldIdxFileName)
defer oldIdxFile.Close()
oldDatFile, err := os.Open(oldDatFileName)
defer oldDatFile.Close()
if indexSize, err = verifyIndexFileIntegrity(oldIdxFile); err != nil {
return fmt.Errorf("verifyIndexFileIntegrity %s failed: %v", oldIdxFileName, err)
}
if indexSize == 0 || uint64(indexSize) <= v.lastCompactIndexOffset {
return nil
}
oldDatCompactRevision, err := fetchCompactRevisionFromDatFile(oldDatFile)
if err != nil {
return fmt.Errorf("fetchCompactRevisionFromDatFile src %s failed: %v", oldDatFile.Name(), err)
}
if oldDatCompactRevision != v.lastCompactRevision {
return fmt.Errorf("current old dat file's compact revision %d is not the expected one %d", oldDatCompactRevision, v.lastCompactRevision)
}
type keyField struct {
offset Offset
size uint32
}
incrementedHasUpdatedIndexEntry := make(map[NeedleId]keyField)
for idxOffset := indexSize - NeedleMapEntrySize; uint64(idxOffset) >= v.lastCompactIndexOffset; idxOffset -= NeedleMapEntrySize {
var IdxEntry []byte
if IdxEntry, err = readIndexEntryAtOffset(oldIdxFile, idxOffset); err != nil {
return fmt.Errorf("readIndexEntry %s at offset %d failed: %v", oldIdxFileName, idxOffset, err)
}
key, offset, size := idx2.IdxFileEntry(IdxEntry)
glog.V(4).Infof("key %d offset %d size %d", key, offset, size)
if _, found := incrementedHasUpdatedIndexEntry[key]; !found {
incrementedHasUpdatedIndexEntry[key] = keyField{
offset: offset,
size: size,
}
}
}
// no updates during commit step
if len(incrementedHasUpdatedIndexEntry) == 0 {
return nil
}
// deal with updates during commit step
var (
dst, idx *os.File
)
if dst, err = os.OpenFile(newDatFileName, os.O_RDWR, 0644); err != nil {
return fmt.Errorf("open dat file %s failed: %v", newDatFileName, err)
}
defer dst.Close()
if idx, err = os.OpenFile(newIdxFileName, os.O_RDWR, 0644); err != nil {
return fmt.Errorf("open idx file %s failed: %v", newIdxFileName, err)
}
defer idx.Close()
var newDatCompactRevision uint16
newDatCompactRevision, err = fetchCompactRevisionFromDatFile(dst)
if err != nil {
return fmt.Errorf("fetchCompactRevisionFromDatFile dst %s failed: %v", dst.Name(), err)
}
if oldDatCompactRevision+1 != newDatCompactRevision {
return fmt.Errorf("oldDatFile %s 's compact revision is %d while newDatFile %s 's compact revision is %d", oldDatFileName, oldDatCompactRevision, newDatFileName, newDatCompactRevision)
}
for key, increIdxEntry := range incrementedHasUpdatedIndexEntry {
idxEntryBytes := needle_map.ToBytes(key, increIdxEntry.offset, increIdxEntry.size)
var offset int64
if offset, err = dst.Seek(0, 2); err != nil {
glog.V(0).Infof("failed to seek the end of file: %v", err)
return
}
//ensure file writing starting from aligned positions
if offset%NeedlePaddingSize != 0 {
offset = offset + (NeedlePaddingSize - offset%NeedlePaddingSize)
if offset, err = dst.Seek(offset, 0); err != nil {
glog.V(0).Infof("failed to align in datafile %s: %v", dst.Name(), err)
return
}
}
//updated needle
if !increIdxEntry.offset.IsZero() && increIdxEntry.size != 0 && increIdxEntry.size != TombstoneFileSize {
//even the needle cache in memory is hit, the need_bytes is correct
glog.V(4).Infof("file %d offset %d size %d", key, increIdxEntry.offset.ToAcutalOffset(), increIdxEntry.size)
var needleBytes []byte
needleBytes, err = needle.ReadNeedleBlob(oldDatFile, increIdxEntry.offset.ToAcutalOffset(), increIdxEntry.size, v.Version())
if err != nil {
return fmt.Errorf("ReadNeedleBlob %s key %d offset %d size %d failed: %v", oldDatFile.Name(), key, increIdxEntry.offset.ToAcutalOffset(), increIdxEntry.size, err)
}
dst.Write(needleBytes)
util.Uint32toBytes(idxEntryBytes[8:12], uint32(offset/NeedlePaddingSize))
} else { //deleted needle
//fakeDelNeedle 's default Data field is nil
fakeDelNeedle := new(needle.Needle)
fakeDelNeedle.Id = key
fakeDelNeedle.Cookie = 0x12345678
fakeDelNeedle.AppendAtNs = uint64(time.Now().UnixNano())
_, _, _, err = fakeDelNeedle.Append(dst, v.Version())
if err != nil {
return fmt.Errorf("append deleted %d failed: %v", key, err)
}
util.Uint32toBytes(idxEntryBytes[8:12], uint32(0))
}
if _, err := idx.Seek(0, 2); err != nil {
return fmt.Errorf("cannot seek end of indexfile %s: %v",
newIdxFileName, err)
}
_, err = idx.Write(idxEntryBytes)
}
return nil
}
type VolumeFileScanner4Vacuum struct {
version needle.Version
v *Volume
dst *os.File
nm *NeedleMap
newOffset int64
now uint64
writeThrottler *util.WriteThrottler
}
func (scanner *VolumeFileScanner4Vacuum) VisitSuperBlock(superBlock SuperBlock) error {
scanner.version = superBlock.Version()
superBlock.CompactionRevision++
_, err := scanner.dst.Write(superBlock.Bytes())
scanner.newOffset = int64(superBlock.BlockSize())
return err
}
func (scanner *VolumeFileScanner4Vacuum) ReadNeedleBody() bool {
return true
}
func (scanner *VolumeFileScanner4Vacuum) VisitNeedle(n *needle.Needle, offset int64) error {
if n.HasTtl() && scanner.now >= n.LastModified+uint64(scanner.v.Ttl.Minutes()*60) {
return nil
}
nv, ok := scanner.v.nm.Get(n.Id)
glog.V(4).Infoln("needle expected offset ", offset, "ok", ok, "nv", nv)
if ok && nv.Offset.ToAcutalOffset() == offset && nv.Size > 0 && nv.Size != TombstoneFileSize {
if err := scanner.nm.Put(n.Id, ToOffset(scanner.newOffset), n.Size); err != nil {
return fmt.Errorf("cannot put needle: %s", err)
}
if _, _, _, err := n.Append(scanner.dst, scanner.v.Version()); err != nil {
return fmt.Errorf("cannot append needle: %s", err)
}
delta := n.DiskSize(scanner.version)
scanner.newOffset += delta
scanner.writeThrottler.MaybeSlowdown(delta)
glog.V(4).Infoln("saving key", n.Id, "volume offset", offset, "=>", scanner.newOffset, "data_size", n.Size)
}
return nil
}
func (v *Volume) copyDataAndGenerateIndexFile(dstName, idxName string, preallocate int64, compactionBytePerSecond int64) (err error) {
var (
dst, idx *os.File
)
if dst, err = createVolumeFile(dstName, preallocate); err != nil {
return
}
defer dst.Close()
if idx, err = os.OpenFile(idxName, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644); err != nil {
return
}
defer idx.Close()
scanner := &VolumeFileScanner4Vacuum{
v: v,
now: uint64(time.Now().Unix()),
nm: NewBtreeNeedleMap(idx),
dst: dst,
writeThrottler: util.NewWriteThrottler(compactionBytePerSecond),
}
err = ScanVolumeFile(v.dir, v.Collection, v.Id, v.needleMapKind, scanner)
return
}
func (v *Volume) copyDataBasedOnIndexFile(dstName, idxName string) (err error) {
var (
dst, idx, oldIndexFile *os.File
)
if dst, err = os.OpenFile(dstName, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644); err != nil {
return
}
defer dst.Close()
if idx, err = os.OpenFile(idxName, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644); err != nil {
return
}
defer idx.Close()
if oldIndexFile, err = os.OpenFile(v.FileName()+".idx", os.O_RDONLY, 0644); err != nil {
return
}
defer oldIndexFile.Close()
nm := NewBtreeNeedleMap(idx)
now := uint64(time.Now().Unix())
v.SuperBlock.CompactionRevision++
dst.Write(v.SuperBlock.Bytes())
newOffset := int64(v.SuperBlock.BlockSize())
idx2.WalkIndexFile(oldIndexFile, func(key NeedleId, offset Offset, size uint32) error {
if offset.IsZero() || size == TombstoneFileSize {
return nil
}
nv, ok := v.nm.Get(key)
if !ok {
return nil
}
n := new(needle.Needle)
err := n.ReadData(v.dataFile, offset.ToAcutalOffset(), size, v.Version())
if err != nil {
return nil
}
if n.HasTtl() && now >= n.LastModified+uint64(v.Ttl.Minutes()*60) {
return nil
}
glog.V(4).Infoln("needle expected offset ", offset, "ok", ok, "nv", nv)
if nv.Offset == offset && nv.Size > 0 {
if err = nm.Put(n.Id, ToOffset(newOffset), n.Size); err != nil {
return fmt.Errorf("cannot put needle: %s", err)
}
if _, _, _, err = n.Append(dst, v.Version()); err != nil {
return fmt.Errorf("cannot append needle: %s", err)
}
newOffset += n.DiskSize(v.Version())
glog.V(3).Infoln("saving key", n.Id, "volume offset", offset, "=>", newOffset, "data_size", n.Size)
}
return nil
})
return
}