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package erasure_coding
import ( "errors" "fmt" "math" "os" "sort" "sync" "time"
"github.com/chrislusf/seaweedfs/weed/pb" "github.com/chrislusf/seaweedfs/weed/pb/master_pb" "github.com/chrislusf/seaweedfs/weed/storage/idx" "github.com/chrislusf/seaweedfs/weed/storage/needle" "github.com/chrislusf/seaweedfs/weed/storage/types" )
var ( NotFoundError = errors.New("needle not found") )
type EcVolume struct { VolumeId needle.VolumeId Collection string dir string ecxFile *os.File ecxFileSize int64 ecxCreatedAt time.Time Shards []*EcVolumeShard ShardLocations map[ShardId][]string ShardLocationsRefreshTime time.Time ShardLocationsLock sync.RWMutex Version needle.Version ecjFile *os.File ecjFileAccessLock sync.Mutex }
func NewEcVolume(dir string, collection string, vid needle.VolumeId) (ev *EcVolume, err error) { ev = &EcVolume{dir: dir, Collection: collection, VolumeId: vid}
baseFileName := EcShardFileName(collection, dir, int(vid))
// open ecx file
if ev.ecxFile, err = os.OpenFile(baseFileName+".ecx", os.O_RDWR, 0644); err != nil { return nil, fmt.Errorf("cannot open ec volume index %s.ecx: %v", baseFileName, err) } ecxFi, statErr := ev.ecxFile.Stat() if statErr != nil { return nil, fmt.Errorf("can not stat ec volume index %s.ecx: %v", baseFileName, statErr) } ev.ecxFileSize = ecxFi.Size() ev.ecxCreatedAt = ecxFi.ModTime()
// open ecj file
if ev.ecjFile, err = os.OpenFile(baseFileName+".ecj", os.O_RDWR|os.O_CREATE, 0644); err != nil { return nil, fmt.Errorf("cannot open ec volume journal %s.ecj: %v", baseFileName, err) }
// read volume info
ev.Version = needle.Version3 if volumeInfo, found := pb.MaybeLoadVolumeInfo(baseFileName + ".vif"); found { ev.Version = needle.Version(volumeInfo.Version) }
ev.ShardLocations = make(map[ShardId][]string)
return }
func (ev *EcVolume) AddEcVolumeShard(ecVolumeShard *EcVolumeShard) bool { for _, s := range ev.Shards { if s.ShardId == ecVolumeShard.ShardId { return false } } ev.Shards = append(ev.Shards, ecVolumeShard) sort.Slice(ev.Shards, func(i, j int) bool { return ev.Shards[i].VolumeId < ev.Shards[j].VolumeId || ev.Shards[i].VolumeId == ev.Shards[j].VolumeId && ev.Shards[i].ShardId < ev.Shards[j].ShardId }) return true }
func (ev *EcVolume) DeleteEcVolumeShard(shardId ShardId) (ecVolumeShard *EcVolumeShard, deleted bool) { foundPosition := -1 for i, s := range ev.Shards { if s.ShardId == shardId { foundPosition = i } } if foundPosition < 0 { return nil, false }
ecVolumeShard = ev.Shards[foundPosition]
ev.Shards = append(ev.Shards[:foundPosition], ev.Shards[foundPosition+1:]...) return ecVolumeShard, true }
func (ev *EcVolume) FindEcVolumeShard(shardId ShardId) (ecVolumeShard *EcVolumeShard, found bool) { for _, s := range ev.Shards { if s.ShardId == shardId { return s, true } } return nil, false }
func (ev *EcVolume) Close() { for _, s := range ev.Shards { s.Close() } if ev.ecjFile != nil { ev.ecjFileAccessLock.Lock() _ = ev.ecjFile.Close() ev.ecjFile = nil ev.ecjFileAccessLock.Unlock() } if ev.ecxFile != nil { _ = ev.ecxFile.Close() ev.ecxFile = nil } }
func (ev *EcVolume) Destroy() {
ev.Close()
for _, s := range ev.Shards { s.Destroy() } os.Remove(ev.FileName() + ".ecx") os.Remove(ev.FileName() + ".ecj") os.Remove(ev.FileName() + ".vif") }
func (ev *EcVolume) FileName() string {
return EcShardFileName(ev.Collection, ev.dir, int(ev.VolumeId))
}
func (ev *EcVolume) ShardSize() int64 { if len(ev.Shards) > 0 { return ev.Shards[0].Size() } return 0 }
func (ev *EcVolume) CreatedAt() time.Time { return ev.ecxCreatedAt }
func (ev *EcVolume) ShardIdList() (shardIds []ShardId) { for _, s := range ev.Shards { shardIds = append(shardIds, s.ShardId) } return }
func (ev *EcVolume) ToVolumeEcShardInformationMessage() (messages []*master_pb.VolumeEcShardInformationMessage) { prevVolumeId := needle.VolumeId(math.MaxUint32) var m *master_pb.VolumeEcShardInformationMessage for _, s := range ev.Shards { if s.VolumeId != prevVolumeId { m = &master_pb.VolumeEcShardInformationMessage{ Id: uint32(s.VolumeId), Collection: s.Collection, } messages = append(messages, m) } prevVolumeId = s.VolumeId m.EcIndexBits = uint32(ShardBits(m.EcIndexBits).AddShardId(s.ShardId)) } return }
func (ev *EcVolume) LocateEcShardNeedle(needleId types.NeedleId, version needle.Version) (offset types.Offset, size uint32, intervals []Interval, err error) {
// find the needle from ecx file
offset, size, err = ev.FindNeedleFromEcx(needleId) if err != nil { return types.Offset{}, 0, nil, fmt.Errorf("FindNeedleFromEcx: %v", err) }
shard := ev.Shards[0]
// calculate the locations in the ec shards
intervals = LocateData(ErasureCodingLargeBlockSize, ErasureCodingSmallBlockSize, DataShardsCount*shard.ecdFileSize, offset.ToAcutalOffset(), uint32(needle.GetActualSize(size, version)))
return }
func (ev *EcVolume) FindNeedleFromEcx(needleId types.NeedleId) (offset types.Offset, size uint32, err error) { return SearchNeedleFromSortedIndex(ev.ecxFile, ev.ecxFileSize, needleId, nil) }
func SearchNeedleFromSortedIndex(ecxFile *os.File, ecxFileSize int64, needleId types.NeedleId, processNeedleFn func(file *os.File, offset int64) error) (offset types.Offset, size uint32, err error) { var key types.NeedleId buf := make([]byte, types.NeedleMapEntrySize) l, h := int64(0), ecxFileSize/types.NeedleMapEntrySize for l < h { m := (l + h) / 2 if _, err := ecxFile.ReadAt(buf, m*types.NeedleMapEntrySize); err != nil { return types.Offset{}, types.TombstoneFileSize, fmt.Errorf("ecx file %d read at %d: %v", ecxFileSize, m*types.NeedleMapEntrySize, err) } key, offset, size = idx.IdxFileEntry(buf) if key == needleId { if processNeedleFn != nil { err = processNeedleFn(ecxFile, m*types.NeedleHeaderSize) } return } if key < needleId { l = m + 1 } else { h = m } }
err = NotFoundError return }
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