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package storage
import ( "fmt" "os" "time"
"github.com/syndtr/goleveldb/leveldb/opt"
"github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/stats" "github.com/chrislusf/seaweedfs/weed/storage/backend" "github.com/chrislusf/seaweedfs/weed/storage/needle" "github.com/chrislusf/seaweedfs/weed/storage/super_block" )
func loadVolumeWithoutIndex(dirname string, collection string, id needle.VolumeId, needleMapKind NeedleMapType) (v *Volume, err error) { v = &Volume{dir: dirname, Collection: collection, Id: id} v.SuperBlock = super_block.SuperBlock{} v.needleMapKind = needleMapKind err = v.load(false, false, needleMapKind, 0) return }
func (v *Volume) load(alsoLoadIndex bool, createDatIfMissing bool, needleMapKind NeedleMapType, preallocate int64) (err error) { fileName := v.FileName() alreadyHasSuperBlock := false
if v.maybeLoadVolumeTierInfo() { v.noWriteCanDelete = true // open remote file
alreadyHasSuperBlock = true } else if exists, canRead, canWrite, modifiedTime, fileSize := checkFile(fileName + ".dat"); exists { // open dat file
if !canRead { return fmt.Errorf("cannot read Volume Data file %s.dat", fileName) } var dataFile *os.File if canWrite { dataFile, err = os.OpenFile(fileName+".dat", os.O_RDWR|os.O_CREATE, 0644) } else { glog.V(0).Infoln("opening " + fileName + ".dat in READONLY mode") dataFile, err = os.Open(fileName + ".dat") v.noWriteOrDelete = true } v.lastModifiedTsSeconds = uint64(modifiedTime.Unix()) if fileSize >= super_block.SuperBlockSize { alreadyHasSuperBlock = true } v.DataBackend = backend.NewDiskFile(dataFile) } else { if createDatIfMissing { v.DataBackend, err = createVolumeFile(fileName+".dat", preallocate, v.MemoryMapMaxSizeMb) } else { return fmt.Errorf("Volume Data file %s.dat does not exist.", fileName) } }
if err != nil { if !os.IsPermission(err) { return fmt.Errorf("cannot load Volume Data %s.dat: %v", fileName, err) } else { return fmt.Errorf("load data file %s.dat: %v", fileName, err) } }
if alreadyHasSuperBlock { err = v.readSuperBlock() } else { if !v.SuperBlock.Initialized() { return fmt.Errorf("volume %s.dat not initialized", fileName) } err = v.maybeWriteSuperBlock() } if err == nil && alsoLoadIndex { var indexFile *os.File if v.noWriteOrDelete { glog.V(1).Infoln("open to read file", fileName+".idx") if indexFile, err = os.OpenFile(fileName+".idx", os.O_RDONLY, 0644); err != nil { return fmt.Errorf("cannot read Volume Index %s.idx: %v", fileName, err) } } else { glog.V(1).Infoln("open to write file", fileName+".idx") if indexFile, err = os.OpenFile(fileName+".idx", os.O_RDWR|os.O_CREATE, 0644); err != nil { return fmt.Errorf("cannot write Volume Index %s.idx: %v", fileName, err) } } if v.lastAppendAtNs, err = CheckVolumeDataIntegrity(v, indexFile); err != nil { v.noWriteOrDelete = true glog.V(0).Infof("volumeDataIntegrityChecking failed %v", err) }
if v.noWriteOrDelete || v.noWriteCanDelete { if v.nm, err = NewSortedFileNeedleMap(fileName, indexFile); err != nil { glog.V(0).Infof("loading sorted db %s error: %v", fileName+".sdx", err) } } else { switch needleMapKind { case NeedleMapInMemory: glog.V(0).Infoln("loading index", fileName+".idx", "to memory") if v.nm, err = LoadCompactNeedleMap(indexFile); err != nil { glog.V(0).Infof("loading index %s to memory error: %v", fileName+".idx", err) } case NeedleMapLevelDb: glog.V(0).Infoln("loading leveldb", fileName+".ldb") opts := &opt.Options{ BlockCacheCapacity: 2 * 1024 * 1024, // default value is 8MiB
WriteBuffer: 1 * 1024 * 1024, // default value is 4MiB
CompactionTableSizeMultiplier: 10, // default value is 1
} if v.nm, err = NewLevelDbNeedleMap(fileName+".ldb", indexFile, opts); err != nil { glog.V(0).Infof("loading leveldb %s error: %v", fileName+".ldb", err) } case NeedleMapLevelDbMedium: glog.V(0).Infoln("loading leveldb medium", fileName+".ldb") opts := &opt.Options{ BlockCacheCapacity: 4 * 1024 * 1024, // default value is 8MiB
WriteBuffer: 2 * 1024 * 1024, // default value is 4MiB
CompactionTableSizeMultiplier: 10, // default value is 1
} if v.nm, err = NewLevelDbNeedleMap(fileName+".ldb", indexFile, opts); err != nil { glog.V(0).Infof("loading leveldb %s error: %v", fileName+".ldb", err) } case NeedleMapLevelDbLarge: glog.V(0).Infoln("loading leveldb large", fileName+".ldb") opts := &opt.Options{ BlockCacheCapacity: 8 * 1024 * 1024, // default value is 8MiB
WriteBuffer: 4 * 1024 * 1024, // default value is 4MiB
CompactionTableSizeMultiplier: 10, // default value is 1
} if v.nm, err = NewLevelDbNeedleMap(fileName+".ldb", indexFile, opts); err != nil { glog.V(0).Infof("loading leveldb %s error: %v", fileName+".ldb", err) } } } }
stats.VolumeServerVolumeCounter.WithLabelValues(v.Collection, "volume").Inc()
return err }
func checkFile(filename string) (exists, canRead, canWrite bool, modTime time.Time, fileSize int64) { exists = true fi, err := os.Stat(filename) if os.IsNotExist(err) { exists = false return } if fi.Mode()&0400 != 0 { canRead = true } if fi.Mode()&0200 != 0 { canWrite = true } modTime = fi.ModTime() fileSize = fi.Size() return }
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