Chris Lu
9 years ago
4 changed files with 234 additions and 225 deletions
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4weed/storage/store.go
-
222weed/storage/volume.go
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231weed/storage/volume_read_write.go
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2weed/storage/volume_sync.go
@ -0,0 +1,231 @@ |
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package storage |
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|
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import ( |
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"bytes" |
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"errors" |
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"fmt" |
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"io" |
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"os" |
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"time" |
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"github.com/chrislusf/seaweedfs/weed/glog" |
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) |
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|
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// isFileUnchanged checks whether this needle to write is same as last one.
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// It requires serialized access in the same volume.
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func (v *Volume) isFileUnchanged(n *Needle) bool { |
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if v.Ttl.String() != "" { |
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return false |
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} |
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nv, ok := v.nm.Get(n.Id) |
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if ok && nv.Offset > 0 { |
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oldNeedle := new(Needle) |
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err := oldNeedle.ReadData(v.dataFile, int64(nv.Offset)*NeedlePaddingSize, nv.Size, v.Version()) |
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if err != nil { |
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glog.V(0).Infof("Failed to check updated file %v", err) |
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return false |
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} |
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defer oldNeedle.ReleaseMemory() |
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if oldNeedle.Checksum == n.Checksum && bytes.Equal(oldNeedle.Data, n.Data) { |
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n.DataSize = oldNeedle.DataSize |
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return true |
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} |
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} |
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return false |
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} |
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|
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// Destroy removes everything related to this volume
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func (v *Volume) Destroy() (err error) { |
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if v.readOnly { |
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err = fmt.Errorf("%s is read-only", v.dataFile.Name()) |
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return |
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} |
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v.Close() |
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err = os.Remove(v.dataFile.Name()) |
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if err != nil { |
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return |
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} |
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err = v.nm.Destroy() |
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return |
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} |
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|
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// AppendBlob append a blob to end of the data file, used in replication
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func (v *Volume) AppendBlob(b []byte) (offset int64, err error) { |
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if v.readOnly { |
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err = fmt.Errorf("%s is read-only", v.dataFile.Name()) |
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return |
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} |
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v.dataFileAccessLock.Lock() |
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defer v.dataFileAccessLock.Unlock() |
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if offset, err = v.dataFile.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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v.dataFile.Write(b) |
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return |
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} |
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|
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func (v *Volume) writeNeedle(n *Needle) (size uint32, err error) { |
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glog.V(4).Infof("writing needle %s", NewFileIdFromNeedle(v.Id, n).String()) |
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if v.readOnly { |
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err = fmt.Errorf("%s is read-only", v.dataFile.Name()) |
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return |
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} |
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v.dataFileAccessLock.Lock() |
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defer v.dataFileAccessLock.Unlock() |
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if v.isFileUnchanged(n) { |
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size = n.DataSize |
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glog.V(4).Infof("needle is unchanged!") |
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return |
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} |
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var offset int64 |
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if offset, err = v.dataFile.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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|
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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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if size, err = n.Append(v.dataFile, v.Version()); err != nil { |
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if e := v.dataFile.Truncate(offset); e != nil { |
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err = fmt.Errorf("%s\ncannot truncate %s: %v", err, v.dataFile.Name(), e) |
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} |
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return |
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} |
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nv, ok := v.nm.Get(n.Id) |
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if !ok || int64(nv.Offset)*NeedlePaddingSize < offset { |
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if err = v.nm.Put(n.Id, uint32(offset/NeedlePaddingSize), n.Size); err != nil { |
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glog.V(4).Infof("failed to save in needle map %d: %v", n.Id, err) |
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} |
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} |
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if v.lastModifiedTime < n.LastModified { |
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v.lastModifiedTime = n.LastModified |
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} |
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return |
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} |
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func (v *Volume) deleteNeedle(n *Needle) (uint32, error) { |
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glog.V(4).Infof("delete needle %s", NewFileIdFromNeedle(v.Id, n).String()) |
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if v.readOnly { |
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return 0, fmt.Errorf("%s is read-only", v.dataFile.Name()) |
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} |
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v.dataFileAccessLock.Lock() |
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defer v.dataFileAccessLock.Unlock() |
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nv, ok := v.nm.Get(n.Id) |
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//fmt.Println("key", n.Id, "volume offset", nv.Offset, "data_size", n.Size, "cached size", nv.Size)
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if ok { |
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size := nv.Size |
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if err := v.nm.Delete(n.Id); err != nil { |
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return size, err |
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} |
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if _, err := v.dataFile.Seek(0, 2); err != nil { |
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return size, err |
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} |
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n.Data = nil |
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_, err := n.Append(v.dataFile, v.Version()) |
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return size, err |
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} |
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return 0, nil |
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} |
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// read fills in Needle content by looking up n.Id from NeedleMapper
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func (v *Volume) readNeedle(n *Needle) (int, error) { |
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nv, ok := v.nm.Get(n.Id) |
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if !ok || nv.Offset == 0 { |
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return -1, errors.New("Not Found") |
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} |
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err := n.ReadData(v.dataFile, int64(nv.Offset)*NeedlePaddingSize, nv.Size, v.Version()) |
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if err != nil { |
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return 0, err |
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} |
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bytesRead := len(n.Data) |
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if !n.HasTtl() { |
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return bytesRead, nil |
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} |
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ttlMinutes := n.Ttl.Minutes() |
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if ttlMinutes == 0 { |
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return bytesRead, nil |
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} |
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if !n.HasLastModifiedDate() { |
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return bytesRead, nil |
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} |
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if uint64(time.Now().Unix()) < n.LastModified+uint64(ttlMinutes*60) { |
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return bytesRead, nil |
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} |
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n.ReleaseMemory() |
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return -1, errors.New("Not Found") |
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} |
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func ScanVolumeFile(dirname string, collection string, id VolumeId, |
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needleMapKind NeedleMapType, |
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visitSuperBlock func(SuperBlock) error, |
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readNeedleBody bool, |
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visitNeedle func(n *Needle, offset int64) error) (err error) { |
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var v *Volume |
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if v, err = loadVolumeWithoutIndex(dirname, collection, id, needleMapKind); err != nil { |
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return fmt.Errorf("Failed to load volume %d: %v", id, err) |
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} |
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if err = visitSuperBlock(v.SuperBlock); err != nil { |
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return fmt.Errorf("Failed to process volume %d super block: %v", id, err) |
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} |
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version := v.Version() |
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offset := int64(SuperBlockSize) |
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n, rest, e := ReadNeedleHeader(v.dataFile, version, offset) |
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if e != nil { |
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err = fmt.Errorf("cannot read needle header: %v", e) |
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return |
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} |
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for n != nil { |
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if readNeedleBody { |
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if err = n.ReadNeedleBody(v.dataFile, version, offset+int64(NeedleHeaderSize), rest); err != nil { |
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glog.V(0).Infof("cannot read needle body: %v", err) |
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//err = fmt.Errorf("cannot read needle body: %v", err)
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//return
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} |
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if n.DataSize >= n.Size { |
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// this should come from a bug reported on #87 and #93
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// fixed in v0.69
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// remove this whole "if" clause later, long after 0.69
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oldRest, oldSize := rest, n.Size |
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padding := NeedlePaddingSize - ((n.Size + NeedleHeaderSize + NeedleChecksumSize) % NeedlePaddingSize) |
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n.Size = 0 |
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rest = n.Size + NeedleChecksumSize + padding |
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if rest%NeedlePaddingSize != 0 { |
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rest += (NeedlePaddingSize - rest%NeedlePaddingSize) |
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} |
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glog.V(4).Infof("Adjusting n.Size %d=>0 rest:%d=>%d %+v", oldSize, oldRest, rest, n) |
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} |
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} |
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if err = visitNeedle(n, offset); err != nil { |
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glog.V(0).Infof("visit needle error: %v", err) |
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} |
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offset += int64(NeedleHeaderSize) + int64(rest) |
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glog.V(4).Infof("==> new entry offset %d", offset) |
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if n, rest, err = ReadNeedleHeader(v.dataFile, version, offset); err != nil { |
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if err == io.EOF { |
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return nil |
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} |
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return fmt.Errorf("cannot read needle header: %v", err) |
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} |
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glog.V(4).Infof("new entry needle size:%d rest:%d", n.Size, rest) |
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} |
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|
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return |
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} |
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