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315 lines
9.2 KiB
315 lines
9.2 KiB
package storage
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import (
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"fmt"
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"os"
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"time"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/util"
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)
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func (v *Volume) garbageLevel() float64 {
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return float64(v.nm.DeletedSize()) / float64(v.ContentSize())
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}
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func (v *Volume) Compact() error {
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glog.V(3).Infof("Compacting ...")
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//no need to lock for copy on write
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//v.accessLock.Lock()
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//defer v.accessLock.Unlock()
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//glog.V(3).Infof("Got Compaction lock...")
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filePath := v.FileName()
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v.lastCompactIndexOffset = v.nm.IndexFileSize()
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v.lastCompactRevision = v.SuperBlock.CompactRevision
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glog.V(3).Infof("creating copies for volume %d ,last offset %d...", v.Id, v.lastCompactIndexOffset)
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return v.copyDataAndGenerateIndexFile(filePath+".cpd", filePath+".cpx")
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}
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func (v *Volume) Compact2() error {
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glog.V(3).Infof("Compact2 ...")
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filePath := v.FileName()
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glog.V(3).Infof("creating copies for volume %d ...", v.Id)
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return v.copyDataBasedOnIndexFile(filePath+".cpd", filePath+".cpx")
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}
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func (v *Volume) commitCompact() error {
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glog.V(3).Infof("Committing vacuuming...")
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v.dataFileAccessLock.Lock()
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defer v.dataFileAccessLock.Unlock()
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glog.V(3).Infof("Got Committing lock...")
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v.nm.Close()
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_ = v.dataFile.Close()
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var e error
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if e = v.makeupDiff(v.FileName()+".cpd", v.FileName()+".cpx", v.FileName()+".dat", v.FileName()+".idx"); e != nil {
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glog.V(0).Infof("makeupDiff in commitCompact failed %v", e)
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e = os.Remove(v.FileName() + ".cpd")
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if e != nil {
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return e
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}
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e = os.Remove(v.FileName() + ".cpx")
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if e != nil {
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return e
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}
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} else {
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var e error
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if e = os.Rename(v.FileName()+".cpd", v.FileName()+".dat"); e != nil {
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return e
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}
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if e = os.Rename(v.FileName()+".cpx", v.FileName()+".idx"); e != nil {
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return e
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}
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}
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//glog.V(3).Infof("Pretending to be vacuuming...")
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//time.Sleep(20 * time.Second)
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glog.V(3).Infof("Loading Commit file...")
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if e = v.load(true, false, v.needleMapKind); e != nil {
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return e
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}
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return nil
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}
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func fetchCompactRevisionFromDatFile(file *os.File) (compactRevision uint16, err error) {
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if _, err = file.Seek(0, 0); err != nil {
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return 0, fmt.Errorf("cannot seek to the beginning of %s: %v", file.Name(), err)
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}
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header := make([]byte, SuperBlockSize)
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if _, e := file.Read(header); e != nil {
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return 0, fmt.Errorf("cannot read file %s 's super block: %v", file.Name(), e)
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}
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superBlock, err := ParseSuperBlock(header)
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if err != nil {
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return 0, err
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}
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return superBlock.CompactRevision, nil
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}
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func (v *Volume) makeupDiff(newDatFileName, newIdxFileName, oldDatFileName, oldIdxFileName string) (err error) {
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var indexSize int64
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oldIdxFile, err := os.Open(oldIdxFileName)
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defer oldIdxFile.Close()
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oldDatFile, err := os.Open(oldDatFileName)
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defer oldDatFile.Close()
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if indexSize, err = verifyIndexFileIntegrity(oldIdxFile); err != nil {
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return fmt.Errorf("verifyIndexFileIntegrity %s failed: %v", oldIdxFileName, err)
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}
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if indexSize == 0 || uint64(indexSize) <= v.lastCompactIndexOffset {
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return nil
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}
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oldDatCompactRevision, err := fetchCompactRevisionFromDatFile(oldDatFile)
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if err != nil {
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return
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}
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if oldDatCompactRevision != v.lastCompactRevision {
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return fmt.Errorf("current old dat file's compact revision %d is not the expected one %d", oldDatCompactRevision, v.lastCompactRevision)
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}
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type keyField struct {
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offset uint32
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size uint32
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}
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incrementedHasUpdatedIndexEntry := make(map[uint64]keyField)
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for idx_offset := indexSize - NeedleIndexSize; uint64(idx_offset) >= v.lastCompactIndexOffset; idx_offset -= NeedleIndexSize {
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var IdxEntry []byte
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if IdxEntry, err = readIndexEntryAtOffset(oldIdxFile, idx_offset); err != nil {
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return fmt.Errorf("readIndexEntry %s at offset %d failed: %v", oldIdxFileName, idx_offset, err)
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}
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key, offset, size := idxFileEntry(IdxEntry)
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if _, found := incrementedHasUpdatedIndexEntry[key]; !found {
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incrementedHasUpdatedIndexEntry[key] = keyField{
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offset: offset,
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size: size,
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}
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}
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}
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if len(incrementedHasUpdatedIndexEntry) > 0 {
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var (
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dst, idx *os.File
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)
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if dst, err = os.OpenFile(newDatFileName, os.O_RDWR, 0644); err != nil {
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return
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}
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defer dst.Close()
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if idx, err = os.OpenFile(newIdxFileName, os.O_RDWR, 0644); err != nil {
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return
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}
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defer idx.Close()
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var newDatCompactRevision uint16
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newDatCompactRevision, err = fetchCompactRevisionFromDatFile(dst)
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if err != nil {
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return
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}
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if oldDatCompactRevision+1 != newDatCompactRevision {
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return fmt.Errorf("oldDatFile %s 's compact revision is %d while newDatFile %s 's compact revision is %d", oldDatFileName, oldDatCompactRevision, newDatFileName, newDatCompactRevision)
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}
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idx_entry_bytes := make([]byte, 16)
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for key, incre_idx_entry := range incrementedHasUpdatedIndexEntry {
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util.Uint64toBytes(idx_entry_bytes[0:8], key)
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util.Uint32toBytes(idx_entry_bytes[8:12], incre_idx_entry.offset)
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util.Uint32toBytes(idx_entry_bytes[12:16], incre_idx_entry.size)
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var offset int64
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if offset, err = dst.Seek(0, 2); err != nil {
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glog.V(0).Infof("failed to seek the end of file: %v", err)
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return
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}
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//ensure file writing starting from aligned positions
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if offset%NeedlePaddingSize != 0 {
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offset = offset + (NeedlePaddingSize - offset%NeedlePaddingSize)
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if offset, err = v.dataFile.Seek(offset, 0); err != nil {
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glog.V(0).Infof("failed to align in datafile %s: %v", v.dataFile.Name(), err)
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return
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}
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}
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//updated needle
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if incre_idx_entry.offset != 0 && incre_idx_entry.size != 0 {
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//even the needle cache in memory is hit, the need_bytes is correct
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var needle_bytes []byte
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needle_bytes, _, err = ReadNeedleBlob(oldDatFile, int64(incre_idx_entry.offset)*NeedlePaddingSize, incre_idx_entry.size)
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if err != nil {
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return
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}
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dst.Write(needle_bytes)
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util.Uint32toBytes(idx_entry_bytes[8:12], uint32(offset/NeedlePaddingSize))
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} else { //deleted needle
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//fakeDelNeedle 's default Data field is nil
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fakeDelNeedle := new(Needle)
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fakeDelNeedle.Id = key
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fakeDelNeedle.Cookie = 0x12345678
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_, err = fakeDelNeedle.Append(dst, v.Version())
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if err != nil {
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return
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}
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util.Uint32toBytes(idx_entry_bytes[8:12], uint32(0))
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}
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if _, err := idx.Seek(0, 2); err != nil {
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return fmt.Errorf("cannot seek end of indexfile %s: %v",
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newIdxFileName, err)
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}
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_, err = idx.Write(idx_entry_bytes)
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}
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}
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return nil
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}
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func (v *Volume) copyDataAndGenerateIndexFile(dstName, idxName string) (err error) {
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var (
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dst, idx *os.File
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)
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if dst, err = os.OpenFile(dstName, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644); err != nil {
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return
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}
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defer dst.Close()
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if idx, err = os.OpenFile(idxName, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644); err != nil {
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return
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}
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defer idx.Close()
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nm := NewNeedleMap(idx)
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new_offset := int64(SuperBlockSize)
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now := uint64(time.Now().Unix())
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err = ScanVolumeFile(v.dir, v.Collection, v.Id, v.needleMapKind,
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func(superBlock SuperBlock) error {
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superBlock.CompactRevision++
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_, err = dst.Write(superBlock.Bytes())
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return err
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}, true, func(n *Needle, offset int64) error {
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if n.HasTtl() && now >= n.LastModified+uint64(v.Ttl.Minutes()*60) {
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return nil
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}
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nv, ok := v.nm.Get(n.Id)
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glog.V(4).Infoln("needle expected offset ", offset, "ok", ok, "nv", nv)
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if ok && int64(nv.Offset)*NeedlePaddingSize == offset && nv.Size > 0 {
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if err = nm.Put(n.Id, uint32(new_offset/NeedlePaddingSize), n.Size); err != nil {
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return fmt.Errorf("cannot put needle: %s", err)
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}
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if _, err = n.Append(dst, v.Version()); err != nil {
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return fmt.Errorf("cannot append needle: %s", err)
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}
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new_offset += n.DiskSize()
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glog.V(3).Infoln("saving key", n.Id, "volume offset", offset, "=>", new_offset, "data_size", n.Size)
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}
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return nil
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})
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return
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}
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func (v *Volume) copyDataBasedOnIndexFile(dstName, idxName string) (err error) {
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var (
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dst, idx, oldIndexFile *os.File
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)
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if dst, err = os.OpenFile(dstName, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644); err != nil {
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return
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}
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defer dst.Close()
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if idx, err = os.OpenFile(idxName, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644); err != nil {
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return
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}
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defer idx.Close()
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if oldIndexFile, err = os.OpenFile(v.FileName()+".idx", os.O_RDONLY, 0644); err != nil {
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return
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}
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defer oldIndexFile.Close()
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nm := NewNeedleMap(idx)
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now := uint64(time.Now().Unix())
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v.SuperBlock.CompactRevision++
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dst.Write(v.SuperBlock.Bytes())
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new_offset := int64(SuperBlockSize)
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WalkIndexFile(oldIndexFile, func(key uint64, offset, size uint32) error {
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if size <= 0 {
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return nil
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}
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nv, ok := v.nm.Get(key)
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if !ok {
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return nil
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}
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n := new(Needle)
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n.ReadData(v.dataFile, int64(offset)*NeedlePaddingSize, size, v.Version())
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defer n.ReleaseMemory()
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if n.HasTtl() && now >= n.LastModified+uint64(v.Ttl.Minutes()*60) {
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return nil
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}
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glog.V(4).Infoln("needle expected offset ", offset, "ok", ok, "nv", nv)
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if nv.Offset == offset && nv.Size > 0 {
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if err = nm.Put(n.Id, uint32(new_offset/NeedlePaddingSize), n.Size); err != nil {
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return fmt.Errorf("cannot put needle: %s", err)
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}
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if _, err = n.Append(dst, v.Version()); err != nil {
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return fmt.Errorf("cannot append needle: %s", err)
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}
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new_offset += n.DiskSize()
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glog.V(3).Infoln("saving key", n.Id, "volume offset", offset, "=>", new_offset, "data_size", n.Size)
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}
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return nil
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})
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return
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}
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