package storage import ( "fmt" "os" "runtime" "time" "github.com/seaweedfs/seaweedfs/weed/glog" "github.com/seaweedfs/seaweedfs/weed/stats" "github.com/seaweedfs/seaweedfs/weed/storage/backend" idx2 "github.com/seaweedfs/seaweedfs/weed/storage/idx" "github.com/seaweedfs/seaweedfs/weed/storage/needle" "github.com/seaweedfs/seaweedfs/weed/storage/needle_map" "github.com/seaweedfs/seaweedfs/weed/storage/super_block" . "github.com/seaweedfs/seaweedfs/weed/storage/types" "github.com/seaweedfs/seaweedfs/weed/util" ) type ProgressFunc func(processed int64) bool func (v *Volume) garbageLevel() float64 { if v.ContentSize() == 0 { return 0 } deletedSize := v.DeletedSize() fileSize := v.ContentSize() if v.DeletedCount() > 0 && v.DeletedSize() == 0 { // this happens for .sdx converted back to normal .idx // where deleted entry size is missing datFileSize, _, _ := v.FileStat() deletedSize = datFileSize - fileSize - super_block.SuperBlockSize fileSize = datFileSize } return float64(deletedSize) / float64(fileSize) } // compact a volume based on deletions in .dat files func (v *Volume) Compact(preallocate int64, compactionBytePerSecond int64) error { if v.MemoryMapMaxSizeMb != 0 { //it makes no sense to compact in memory return nil } 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...") v.isCompacting = true defer func() { v.isCompacting = false }() v.lastCompactIndexOffset = v.IndexFileSize() v.lastCompactRevision = v.SuperBlock.CompactionRevision glog.V(3).Infof("creating copies for volume %d ,last offset %d...", v.Id, v.lastCompactIndexOffset) if err := v.DataBackend.Sync(); err != nil { glog.V(0).Infof("compact fail to sync volume %d", v.Id) } if err := v.nm.Sync(); err != nil { glog.V(0).Infof("compact fail to sync volume idx %d", v.Id) } return v.copyDataAndGenerateIndexFile(v.FileName(".cpd"), v.FileName(".cpx"), preallocate, compactionBytePerSecond) } // compact a volume based on deletions in .idx files func (v *Volume) Compact2(preallocate int64, compactionBytePerSecond int64, progressFn ProgressFunc) error { if v.MemoryMapMaxSizeMb != 0 { //it makes no sense to compact in memory return nil } glog.V(3).Infof("Compact2 volume %d ...", v.Id) v.isCompacting = true defer func() { v.isCompacting = false }() v.lastCompactIndexOffset = v.IndexFileSize() v.lastCompactRevision = v.SuperBlock.CompactionRevision glog.V(3).Infof("creating copies for volume %d ...", v.Id) if v.DataBackend == nil { return fmt.Errorf("volume %d backend is empty remote:%v", v.Id, v.HasRemoteFile()) } if err := v.DataBackend.Sync(); err != nil { glog.V(0).Infof("compact2 fail to sync volume dat %d: %v", v.Id, err) } if err := v.nm.Sync(); err != nil { glog.V(0).Infof("compact2 fail to sync volume idx %d: %v", v.Id, err) } return copyDataBasedOnIndexFile(v.FileName(".dat"), v.FileName(".idx"), v.FileName(".cpd"), v.FileName(".cpx"), v.SuperBlock, v.Version(), preallocate, compactionBytePerSecond, progressFn) } func (v *Volume) CommitCompact() error { if v.MemoryMapMaxSizeMb != 0 { //it makes no sense to compact in memory return nil } glog.V(0).Infof("Committing volume %d vacuuming...", v.Id) v.isCommitCompacting = true defer func() { v.isCommitCompacting = false }() v.dataFileAccessLock.Lock() defer v.dataFileAccessLock.Unlock() glog.V(3).Infof("Got volume %d committing lock...", v.Id) v.nm.Close() if v.DataBackend != nil { if err := v.DataBackend.Close(); err != nil { glog.V(0).Infof("fail to close volume %d", v.Id) } } v.DataBackend = 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 { if runtime.GOOS == "windows" { e = os.RemoveAll(v.FileName(".dat")) if e != nil { return e } e = os.RemoveAll(v.FileName(".idx")) if e != nil { return e } } 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")) 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 && !os.IsNotExist(e1) { return e1 } if e2 != nil && !os.IsNotExist(e2) { return e2 } return nil } func fetchCompactRevisionFromDatFile(datBackend backend.BackendStorageFile) (compactRevision uint16, err error) { superBlock, err := super_block.ReadSuperBlock(datBackend) if err != nil { return 0, err } return superBlock.CompactionRevision, nil } // if old .dat and .idx files are updated, this func tries to apply the same changes to new files accordingly func (v *Volume) makeupDiff(newDatFileName, newIdxFileName, oldDatFileName, oldIdxFileName string) (err error) { var indexSize int64 oldIdxFile, err := os.Open(oldIdxFileName) if err != nil { return fmt.Errorf("makeupDiff open %s failed: %v", oldIdxFileName, err) } defer oldIdxFile.Close() oldDatFile, err := os.Open(oldDatFileName) if err != nil { return fmt.Errorf("makeupDiff open %s failed: %v", oldDatFileName, err) } oldDatBackend := backend.NewDiskFile(oldDatFile) defer oldDatBackend.Close() // skip if the old .idx file has not changed 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 } // fail if the old .dat file has changed to a new revision oldDatCompactRevision, err := fetchCompactRevisionFromDatFile(oldDatBackend) 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 Size } 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) } dstDatBackend := backend.NewDiskFile(dst) defer dstDatBackend.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(dstDatBackend) 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.IsValid() { //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.ToActualOffset(), increIdxEntry.size) var needleBytes []byte needleBytes, err = needle.ReadNeedleBlob(oldDatBackend, increIdxEntry.offset.ToActualOffset(), 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.ToActualOffset(), increIdxEntry.size, err) } dstDatBackend.Write(needleBytes) if err := dstDatBackend.Sync(); err != nil { return fmt.Errorf("cannot sync needle %s: %v", dstDatBackend.File.Name(), err) } 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(dstDatBackend, 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) if err != nil { return fmt.Errorf("cannot write indexfile %s: %v", newIdxFileName, err) } } return nil } type VolumeFileScanner4Vacuum struct { version needle.Version v *Volume dstBackend backend.BackendStorageFile nm *needle_map.MemDb newOffset int64 now uint64 writeThrottler *util.WriteThrottler } func (scanner *VolumeFileScanner4Vacuum) VisitSuperBlock(superBlock super_block.SuperBlock) error { scanner.version = superBlock.Version superBlock.CompactionRevision++ _, err := scanner.dstBackend.WriteAt(superBlock.Bytes(), 0) scanner.newOffset = int64(superBlock.BlockSize()) return err } func (scanner *VolumeFileScanner4Vacuum) ReadNeedleBody() bool { return true } func (scanner *VolumeFileScanner4Vacuum) VisitNeedle(n *needle.Needle, offset int64, needleHeader, needleBody []byte) 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.ToActualOffset() == offset && nv.Size > 0 && nv.Size.IsValid() { if err := scanner.nm.Set(n.Id, ToOffset(scanner.newOffset), n.Size); err != nil { return fmt.Errorf("cannot put needle: %s", err) } if _, _, _, err := n.Append(scanner.dstBackend, 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 backend.BackendStorageFile ) if dst, err = backend.CreateVolumeFile(dstName, preallocate, 0); err != nil { return err } defer dst.Close() nm := needle_map.NewMemDb() defer nm.Close() scanner := &VolumeFileScanner4Vacuum{ v: v, now: uint64(time.Now().Unix()), nm: nm, dstBackend: dst, writeThrottler: util.NewWriteThrottler(compactionBytePerSecond), } err = ScanVolumeFile(v.dir, v.Collection, v.Id, v.needleMapKind, scanner) if err != nil { return err } return nm.SaveToIdx(idxName) } func copyDataBasedOnIndexFile(srcDatName, srcIdxName, dstDatName, datIdxName string, sb super_block.SuperBlock, version needle.Version, preallocate, compactionBytePerSecond int64, progressFn ProgressFunc) (err error) { var ( srcDatBackend, dstDatBackend backend.BackendStorageFile dataFile *os.File ) if dstDatBackend, err = backend.CreateVolumeFile(dstDatName, preallocate, 0); err != nil { return err } defer dstDatBackend.Close() oldNm := needle_map.NewMemDb() defer oldNm.Close() newNm := needle_map.NewMemDb() defer newNm.Close() if err = oldNm.LoadFromIdx(srcIdxName); err != nil { return err } if dataFile, err = os.Open(srcDatName); err != nil { return err } srcDatBackend = backend.NewDiskFile(dataFile) defer srcDatBackend.Close() now := uint64(time.Now().Unix()) sb.CompactionRevision++ dstDatBackend.WriteAt(sb.Bytes(), 0) newOffset := int64(sb.BlockSize()) writeThrottler := util.NewWriteThrottler(compactionBytePerSecond) err = oldNm.AscendingVisit(func(value needle_map.NeedleValue) error { offset, size := value.Offset, value.Size if offset.IsZero() || size.IsDeleted() { return nil } if progressFn != nil { if !progressFn(offset.ToActualOffset()) { return fmt.Errorf("interrupted") } } n := new(needle.Needle) if err := n.ReadData(srcDatBackend, offset.ToActualOffset(), size, version); err != nil { return fmt.Errorf("cannot hydrate needle from file: %s", err) } if n.HasTtl() && now >= n.LastModified+uint64(sb.Ttl.Minutes()*60) { return nil } if err = newNm.Set(n.Id, ToOffset(newOffset), n.Size); err != nil { return fmt.Errorf("cannot put needle: %s", err) } if _, _, _, err = n.Append(dstDatBackend, sb.Version); err != nil { return fmt.Errorf("cannot append needle: %s", err) } delta := n.DiskSize(version) newOffset += delta writeThrottler.MaybeSlowdown(delta) glog.V(4).Infoln("saving key", n.Id, "volume offset", offset, "=>", newOffset, "data_size", n.Size) return nil }) if err != nil { return err } return newNm.SaveToIdx(datIdxName) }