mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-01-19 02:48:24 +00:00
452 lines
14 KiB
Go
452 lines
14 KiB
Go
package storage
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import (
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"fmt"
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"os"
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"runtime"
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"time"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/stats"
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"github.com/chrislusf/seaweedfs/weed/storage/backend"
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idx2 "github.com/chrislusf/seaweedfs/weed/storage/idx"
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"github.com/chrislusf/seaweedfs/weed/storage/needle"
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"github.com/chrislusf/seaweedfs/weed/storage/needle_map"
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"github.com/chrislusf/seaweedfs/weed/storage/super_block"
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. "github.com/chrislusf/seaweedfs/weed/storage/types"
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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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if v.ContentSize() == 0 {
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return 0
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}
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deletedSize := v.DeletedSize()
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fileSize := v.ContentSize()
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if v.DeletedCount() > 0 && v.DeletedSize() == 0 {
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// this happens for .sdx converted back to normal .idx
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// where deleted entry size is missing
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datFileSize, _, _ := v.FileStat()
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deletedSize = datFileSize - fileSize - super_block.SuperBlockSize
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fileSize = datFileSize
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}
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return float64(deletedSize) / float64(fileSize)
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}
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// compact a volume based on deletions in .dat files
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func (v *Volume) Compact(preallocate int64, compactionBytePerSecond int64) error {
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if v.MemoryMapMaxSizeMb != 0 { //it makes no sense to compact in memory
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return nil
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}
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glog.V(3).Infof("Compacting volume %d ...", v.Id)
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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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v.isCompacting = true
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defer func() {
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v.isCompacting = false
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}()
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v.lastCompactIndexOffset = v.IndexFileSize()
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v.lastCompactRevision = v.SuperBlock.CompactionRevision
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glog.V(3).Infof("creating copies for volume %d ,last offset %d...", v.Id, v.lastCompactIndexOffset)
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if err := v.DataBackend.Sync(); err != nil {
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glog.V(0).Infof("compact fail to sync volume %d", v.Id)
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}
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if err := v.nm.Sync(); err != nil {
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glog.V(0).Infof("compact fail to sync volume idx %d", v.Id)
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}
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return v.copyDataAndGenerateIndexFile(v.FileName(".cpd"), v.FileName(".cpx"), preallocate, compactionBytePerSecond)
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}
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// compact a volume based on deletions in .idx files
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func (v *Volume) Compact2(preallocate int64, compactionBytePerSecond int64) error {
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if v.MemoryMapMaxSizeMb != 0 { //it makes no sense to compact in memory
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return nil
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}
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glog.V(3).Infof("Compact2 volume %d ...", v.Id)
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v.isCompacting = true
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defer func() {
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v.isCompacting = false
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}()
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v.lastCompactIndexOffset = v.IndexFileSize()
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v.lastCompactRevision = v.SuperBlock.CompactionRevision
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glog.V(3).Infof("creating copies for volume %d ...", v.Id)
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if err := v.DataBackend.Sync(); err != nil {
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glog.V(0).Infof("compact2 fail to sync volume dat %d: %v", v.Id, err)
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}
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if err := v.nm.Sync(); err != nil {
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glog.V(0).Infof("compact2 fail to sync volume idx %d: %v", v.Id, err)
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}
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return copyDataBasedOnIndexFile(v.FileName(".dat"), v.FileName(".idx"), v.FileName(".cpd"), v.FileName(".cpx"), v.SuperBlock, v.Version(), preallocate, compactionBytePerSecond)
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}
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func (v *Volume) CommitCompact() error {
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if v.MemoryMapMaxSizeMb != 0 { //it makes no sense to compact in memory
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return nil
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}
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glog.V(0).Infof("Committing volume %d vacuuming...", v.Id)
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v.isCompacting = true
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defer func() {
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v.isCompacting = false
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}()
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v.dataFileAccessLock.Lock()
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defer v.dataFileAccessLock.Unlock()
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glog.V(3).Infof("Got volume %d committing lock...", v.Id)
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v.nm.Close()
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if v.DataBackend != nil {
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if err := v.DataBackend.Close(); err != nil {
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glog.V(0).Infof("fail to close volume %d", v.Id)
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}
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}
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v.DataBackend = nil
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stats.VolumeServerVolumeCounter.WithLabelValues(v.Collection, "volume").Dec()
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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 volume %d failed %v", v.Id, 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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if runtime.GOOS == "windows" {
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e = os.RemoveAll(v.FileName(".dat"))
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if e != nil {
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return e
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}
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e = os.RemoveAll(v.FileName(".idx"))
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if e != nil {
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return e
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}
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}
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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 fmt.Errorf("rename %s: %v", v.FileName(".cpd"), 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 fmt.Errorf("rename %s: %v", v.FileName(".cpx"), 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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os.RemoveAll(v.FileName(".ldb"))
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glog.V(3).Infof("Loading volume %d commit file...", v.Id)
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if e = v.load(true, false, v.needleMapKind, 0); 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 (v *Volume) cleanupCompact() error {
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glog.V(0).Infof("Cleaning up volume %d vacuuming...", v.Id)
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e1 := os.Remove(v.FileName(".cpd"))
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e2 := os.Remove(v.FileName(".cpx"))
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if e1 != nil && !os.IsNotExist(e1) {
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return e1
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}
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if e2 != nil && !os.IsNotExist(e2) {
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return e2
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}
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return nil
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}
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func fetchCompactRevisionFromDatFile(datBackend backend.BackendStorageFile) (compactRevision uint16, err error) {
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superBlock, err := super_block.ReadSuperBlock(datBackend)
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if err != nil {
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return 0, err
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}
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return superBlock.CompactionRevision, nil
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}
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// if old .dat and .idx files are updated, this func tries to apply the same changes to new files accordingly
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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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if err != nil {
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return fmt.Errorf("makeupDiff open %s failed: %v", oldIdxFileName, err)
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}
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defer oldIdxFile.Close()
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oldDatFile, err := os.Open(oldDatFileName)
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if err != nil {
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return fmt.Errorf("makeupDiff open %s failed: %v", oldDatFileName, err)
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}
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oldDatBackend := backend.NewDiskFile(oldDatFile)
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defer oldDatBackend.Close()
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// skip if the old .idx file has not changed
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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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// fail if the old .dat file has changed to a new revision
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oldDatCompactRevision, err := fetchCompactRevisionFromDatFile(oldDatBackend)
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if err != nil {
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return fmt.Errorf("fetchCompactRevisionFromDatFile src %s failed: %v", oldDatFile.Name(), err)
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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 Offset
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size Size
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}
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incrementedHasUpdatedIndexEntry := make(map[NeedleId]keyField)
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for idxOffset := indexSize - NeedleMapEntrySize; uint64(idxOffset) >= v.lastCompactIndexOffset; idxOffset -= NeedleMapEntrySize {
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var IdxEntry []byte
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if IdxEntry, err = readIndexEntryAtOffset(oldIdxFile, idxOffset); err != nil {
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return fmt.Errorf("readIndexEntry %s at offset %d failed: %v", oldIdxFileName, idxOffset, err)
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}
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key, offset, size := idx2.IdxFileEntry(IdxEntry)
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glog.V(4).Infof("key %d offset %d size %d", key, offset, size)
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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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// no updates during commit step
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if len(incrementedHasUpdatedIndexEntry) == 0 {
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return nil
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}
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// deal with updates during commit step
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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 fmt.Errorf("open dat file %s failed: %v", newDatFileName, err)
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}
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dstDatBackend := backend.NewDiskFile(dst)
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defer dstDatBackend.Close()
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if idx, err = os.OpenFile(newIdxFileName, os.O_RDWR, 0644); err != nil {
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return fmt.Errorf("open idx file %s failed: %v", newIdxFileName, err)
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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(dstDatBackend)
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if err != nil {
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return fmt.Errorf("fetchCompactRevisionFromDatFile dst %s failed: %v", dst.Name(), err)
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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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for key, increIdxEntry := range incrementedHasUpdatedIndexEntry {
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idxEntryBytes := needle_map.ToBytes(key, increIdxEntry.offset, increIdxEntry.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 = dst.Seek(offset, 0); err != nil {
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glog.V(0).Infof("failed to align in datafile %s: %v", dst.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 !increIdxEntry.offset.IsZero() && increIdxEntry.size != 0 && increIdxEntry.size.IsValid() {
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//even the needle cache in memory is hit, the need_bytes is correct
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glog.V(4).Infof("file %d offset %d size %d", key, increIdxEntry.offset.ToActualOffset(), increIdxEntry.size)
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var needleBytes []byte
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needleBytes, err = needle.ReadNeedleBlob(oldDatBackend, increIdxEntry.offset.ToActualOffset(), increIdxEntry.size, v.Version())
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if err != nil {
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return fmt.Errorf("ReadNeedleBlob %s key %d offset %d size %d failed: %v", oldDatFile.Name(), key, increIdxEntry.offset.ToActualOffset(), increIdxEntry.size, err)
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}
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dstDatBackend.Write(needleBytes)
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util.Uint32toBytes(idxEntryBytes[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.Needle)
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fakeDelNeedle.Id = key
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fakeDelNeedle.Cookie = 0x12345678
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fakeDelNeedle.AppendAtNs = uint64(time.Now().UnixNano())
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_, _, _, err = fakeDelNeedle.Append(dstDatBackend, v.Version())
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if err != nil {
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return fmt.Errorf("append deleted %d failed: %v", key, err)
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}
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util.Uint32toBytes(idxEntryBytes[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(idxEntryBytes)
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}
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return nil
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}
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type VolumeFileScanner4Vacuum struct {
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version needle.Version
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v *Volume
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dstBackend backend.BackendStorageFile
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nm *needle_map.MemDb
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newOffset int64
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now uint64
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writeThrottler *util.WriteThrottler
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}
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func (scanner *VolumeFileScanner4Vacuum) VisitSuperBlock(superBlock super_block.SuperBlock) error {
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scanner.version = superBlock.Version
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superBlock.CompactionRevision++
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_, err := scanner.dstBackend.WriteAt(superBlock.Bytes(), 0)
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scanner.newOffset = int64(superBlock.BlockSize())
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return err
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}
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func (scanner *VolumeFileScanner4Vacuum) ReadNeedleBody() bool {
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return true
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}
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func (scanner *VolumeFileScanner4Vacuum) VisitNeedle(n *needle.Needle, offset int64, needleHeader, needleBody []byte) error {
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if n.HasTtl() && scanner.now >= n.LastModified+uint64(scanner.v.Ttl.Minutes()*60) {
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return nil
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}
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nv, ok := scanner.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 && nv.Offset.ToActualOffset() == offset && nv.Size > 0 && nv.Size.IsValid() {
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if err := scanner.nm.Set(n.Id, ToOffset(scanner.newOffset), 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(scanner.dstBackend, scanner.v.Version()); err != nil {
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return fmt.Errorf("cannot append needle: %s", err)
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}
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delta := n.DiskSize(scanner.version)
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scanner.newOffset += delta
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scanner.writeThrottler.MaybeSlowdown(delta)
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glog.V(4).Infoln("saving key", n.Id, "volume offset", offset, "=>", scanner.newOffset, "data_size", n.Size)
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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, preallocate int64, compactionBytePerSecond int64) (err error) {
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var (
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dst backend.BackendStorageFile
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)
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if dst, err = backend.CreateVolumeFile(dstName, preallocate, 0); err != nil {
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return
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}
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defer dst.Close()
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nm := needle_map.NewMemDb()
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defer nm.Close()
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scanner := &VolumeFileScanner4Vacuum{
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v: v,
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now: uint64(time.Now().Unix()),
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nm: nm,
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dstBackend: dst,
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writeThrottler: util.NewWriteThrottler(compactionBytePerSecond),
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}
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err = ScanVolumeFile(v.dir, v.Collection, v.Id, v.needleMapKind, scanner)
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if err != nil {
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return nil
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}
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err = nm.SaveToIdx(idxName)
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return
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}
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func copyDataBasedOnIndexFile(srcDatName, srcIdxName, dstDatName, datIdxName string, sb super_block.SuperBlock, version needle.Version, preallocate int64, compactionBytePerSecond int64) (err error) {
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var (
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srcDatBackend, dstDatBackend backend.BackendStorageFile
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dataFile *os.File
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)
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if dstDatBackend, err = backend.CreateVolumeFile(dstDatName, preallocate, 0); err != nil {
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return
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}
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defer dstDatBackend.Close()
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oldNm := needle_map.NewMemDb()
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defer oldNm.Close()
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newNm := needle_map.NewMemDb()
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defer newNm.Close()
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if err = oldNm.LoadFromIdx(srcIdxName); err != nil {
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return
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}
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if dataFile, err = os.Open(srcDatName); err != nil {
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return err
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}
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srcDatBackend = backend.NewDiskFile(dataFile)
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defer srcDatBackend.Close()
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now := uint64(time.Now().Unix())
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sb.CompactionRevision++
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dstDatBackend.WriteAt(sb.Bytes(), 0)
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newOffset := int64(sb.BlockSize())
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writeThrottler := util.NewWriteThrottler(compactionBytePerSecond)
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oldNm.AscendingVisit(func(value needle_map.NeedleValue) error {
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offset, size := value.Offset, value.Size
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if offset.IsZero() || size.IsDeleted() {
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return nil
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}
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n := new(needle.Needle)
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err := n.ReadData(srcDatBackend, offset.ToActualOffset(), size, version)
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if err != nil {
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return nil
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}
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if n.HasTtl() && now >= n.LastModified+uint64(sb.Ttl.Minutes()*60) {
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return nil
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}
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if err = newNm.Set(n.Id, ToOffset(newOffset), 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(dstDatBackend, sb.Version); err != nil {
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return fmt.Errorf("cannot append needle: %s", err)
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}
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delta := n.DiskSize(version)
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newOffset += delta
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writeThrottler.MaybeSlowdown(delta)
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glog.V(4).Infoln("saving key", n.Id, "volume offset", offset, "=>", newOffset, "data_size", n.Size)
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return nil
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})
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newNm.SaveToIdx(datIdxName)
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return
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}
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