package storage import ( "fmt" "os" "time" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/util" ) func (v *Volume) garbageLevel() float64 { return float64(v.nm.DeletedSize()) / float64(v.ContentSize()) } func (v *Volume) Compact() error { glog.V(3).Infof("Compacting ...") //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") } func (v *Volume) Compact2() error { glog.V(3).Infof("Compact2 ...") 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(3).Infof("Committing vacuuming...") v.dataFileAccessLock.Lock() defer v.dataFileAccessLock.Unlock() glog.V(3).Infof("Got Committing lock...") v.nm.Close() _ = v.dataFile.Close() 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 failed %v", 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 e } if e = os.Rename(v.FileName()+".cpx", v.FileName()+".idx"); e != nil { return e } } //glog.V(3).Infof("Pretending to be vacuuming...") //time.Sleep(20 * time.Second) glog.V(3).Infof("Loading Commit file...") if e = v.load(true, false, v.needleMapKind); e != nil { return e } return nil } func fetchCompactRevisionFromDatFile(file *os.File) (compactRevision uint16, err error) { if _, err = file.Seek(0, 0); err != nil { return 0, fmt.Errorf("cannot seek to the beginning of %s: %v", file.Name(), err) } header := make([]byte, SuperBlockSize) if _, e := file.Read(header); e != nil { return 0, fmt.Errorf("cannot read file %s 's super block: %v", file.Name(), e) } superBlock, err := ParseSuperBlock(header) 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 } 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 uint32 size uint32 } incrementedHasUpdatedIndexEntry := make(map[uint64]keyField) for idx_offset := indexSize - NeedleIndexSize; uint64(idx_offset) >= v.lastCompactIndexOffset; idx_offset -= NeedleIndexSize { var IdxEntry []byte if IdxEntry, err = readIndexEntryAtOffset(oldIdxFile, idx_offset); err != nil { return fmt.Errorf("readIndexEntry %s at offset %d failed: %v", oldIdxFileName, idx_offset, err) } key, offset, size := idxFileEntry(IdxEntry) if _, found := incrementedHasUpdatedIndexEntry[key]; !found { incrementedHasUpdatedIndexEntry[key] = keyField{ offset: offset, size: size, } } } if len(incrementedHasUpdatedIndexEntry) > 0 { var ( dst, idx *os.File ) if dst, err = os.OpenFile(newDatFileName, os.O_RDWR, 0644); err != nil { return } defer dst.Close() if idx, err = os.OpenFile(newIdxFileName, os.O_RDWR, 0644); err != nil { return } defer idx.Close() var newDatCompactRevision uint16 newDatCompactRevision, err = fetchCompactRevisionFromDatFile(dst) if err != nil { return } 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) } idx_entry_bytes := make([]byte, 16) for key, incre_idx_entry := range incrementedHasUpdatedIndexEntry { util.Uint64toBytes(idx_entry_bytes[0:8], key) util.Uint32toBytes(idx_entry_bytes[8:12], incre_idx_entry.offset) util.Uint32toBytes(idx_entry_bytes[12:16], incre_idx_entry.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 incre_idx_entry.offset != 0 && incre_idx_entry.size != 0 { //even the needle cache in memory is hit, the need_bytes is correct var needle_bytes []byte needle_bytes, _, err = ReadNeedleBlob(oldDatFile, int64(incre_idx_entry.offset)*NeedlePaddingSize, incre_idx_entry.size) if err != nil { return } dst.Write(needle_bytes) util.Uint32toBytes(idx_entry_bytes[8:12], uint32(offset/NeedlePaddingSize)) } else { //deleted needle //fakeDelNeedle 's default Data field is nil fakeDelNeedle := new(Needle) fakeDelNeedle.Id = key fakeDelNeedle.Cookie = 0x12345678 _, err = fakeDelNeedle.Append(dst, v.Version()) if err != nil { return } util.Uint32toBytes(idx_entry_bytes[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(idx_entry_bytes) } } return nil } func (v *Volume) copyDataAndGenerateIndexFile(dstName, idxName string) (err error) { var ( dst, idx *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() nm := NewNeedleMap(idx) new_offset := int64(SuperBlockSize) now := uint64(time.Now().Unix()) err = ScanVolumeFile(v.dir, v.Collection, v.Id, v.needleMapKind, func(superBlock SuperBlock) error { superBlock.CompactRevision++ _, err = dst.Write(superBlock.Bytes()) return err }, true, func(n *Needle, offset int64) error { if n.HasTtl() && now >= n.LastModified+uint64(v.Ttl.Minutes()*60) { return nil } nv, ok := 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 = nm.Put(n.Id, uint32(new_offset/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) } new_offset += n.DiskSize() glog.V(3).Infoln("saving key", n.Id, "volume offset", offset, "=>", new_offset, "data_size", n.Size) } return nil }) 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 := NewNeedleMap(idx) now := uint64(time.Now().Unix()) v.SuperBlock.CompactRevision++ dst.Write(v.SuperBlock.Bytes()) new_offset := int64(SuperBlockSize) WalkIndexFile(oldIndexFile, func(key uint64, offset, size uint32) error { if size <= 0 { 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()) defer n.ReleaseMemory() 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, uint32(new_offset/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) } new_offset += n.DiskSize() glog.V(3).Infoln("saving key", n.Id, "volume offset", offset, "=>", new_offset, "data_size", n.Size) } return nil }) return }