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package storage
import ( "fmt" "os" "time"
"github.com/chrislusf/seaweedfs/weed/glog" . "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) 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.CompactRevision glog.V(3).Infof("creating copies for volume %d ,last offset %d...", v.Id, v.lastCompactIndexOffset) return v.copyDataAndGenerateIndexFile(filePath+".cpd", filePath+".cpx", preallocate) }
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.compactingWg.Add(1) defer v.compactingWg.Done() v.nm.Close() if err := v.dataFile.Close(); err != nil { glog.V(0).Infof("fail to close volume %d", v.Id) } v.dataFile = nil
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.CompactRevision, 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 - NeedleEntrySize; uint64(idxOffset) >= v.lastCompactIndexOffset; idxOffset -= NeedleEntrySize { 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 := 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) }
idxEntryBytes := make([]byte, NeedleIdSize+OffsetSize+SizeSize) for key, increIdxEntry := range incrementedHasUpdatedIndexEntry { NeedleIdToBytes(idxEntryBytes[0:NeedleIdSize], key) OffsetToBytes(idxEntryBytes[NeedleIdSize:NeedleIdSize+OffsetSize], increIdxEntry.offset) util.Uint32toBytes(idxEntryBytes[NeedleIdSize+OffsetSize:NeedleIdSize+OffsetSize+SizeSize], 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 = v.dataFile.Seek(offset, 0); err != nil { glog.V(0).Infof("failed to align in datafile %s: %v", v.dataFile.Name(), err) return } }
//updated needle
if increIdxEntry.offset != 0 && 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, int64(increIdxEntry.offset)*NeedlePaddingSize, increIdxEntry.size) var needleBytes []byte needleBytes, err = ReadNeedleBlob(oldDatFile, int64(increIdxEntry.offset)*NeedlePaddingSize, increIdxEntry.size, v.Version()) if err != nil { return fmt.Errorf("ReadNeedleBlob %s key %d offset %d size %d failed: %v", oldDatFile.Name(), key, int64(increIdxEntry.offset)*NeedlePaddingSize, 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) 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 Version v *Volume dst *os.File nm *NeedleMap newOffset int64 now uint64 }
func (scanner *VolumeFileScanner4Vacuum) VisitSuperBlock(superBlock SuperBlock) error { scanner.version = superBlock.Version() superBlock.CompactRevision++ _, 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, 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 && int64(nv.Offset)*NeedlePaddingSize == offset && nv.Size > 0 { if err := scanner.nm.Put(n.Id, Offset(scanner.newOffset/NeedlePaddingSize), 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) } scanner.newOffset += n.DiskSize(scanner.version) 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) (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, } 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.CompactRevision++ dst.Write(v.SuperBlock.Bytes()) newOffset := int64(v.SuperBlock.BlockSize())
WalkIndexFile(oldIndexFile, func(key NeedleId, offset Offset, size uint32) error { if offset == 0 || size == TombstoneFileSize { return nil }
nv, ok := v.nm.Get(key) if !ok { return nil }
n := new(Needle) n.ReadData(v.dataFile, int64(offset)*NeedlePaddingSize, size, v.Version())
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, Offset(newOffset/NeedlePaddingSize), 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 }
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