mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-11-27 12:49:41 +08:00
281 lines
8.8 KiB
Go
281 lines
8.8 KiB
Go
package storage
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import (
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"fmt"
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"github.com/seaweedfs/seaweedfs/weed/util/mem"
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"io"
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"time"
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"github.com/seaweedfs/seaweedfs/weed/glog"
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"github.com/seaweedfs/seaweedfs/weed/stats"
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"github.com/seaweedfs/seaweedfs/weed/storage/backend"
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"github.com/seaweedfs/seaweedfs/weed/storage/needle"
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"github.com/seaweedfs/seaweedfs/weed/storage/super_block"
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. "github.com/seaweedfs/seaweedfs/weed/storage/types"
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)
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const PagedReadLimit = 1024 * 1024
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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.Needle, readOption *ReadOption, onReadSizeFn func(size Size)) (count int, err error) {
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v.dataFileAccessLock.RLock()
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defer v.dataFileAccessLock.RUnlock()
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nv, ok := v.nm.Get(n.Id)
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if !ok || nv.Offset.IsZero() {
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return -1, ErrorNotFound
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}
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readSize := nv.Size
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if readSize.IsDeleted() {
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if readOption != nil && readOption.ReadDeleted && readSize != TombstoneFileSize {
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glog.V(3).Infof("reading deleted %s", n.String())
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readSize = -readSize
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} else {
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return -1, ErrorDeleted
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}
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}
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if readSize == 0 {
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return 0, nil
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}
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if onReadSizeFn != nil {
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onReadSizeFn(readSize)
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}
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if readOption != nil && readOption.AttemptMetaOnly && readSize > PagedReadLimit {
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readOption.VolumeRevision = v.SuperBlock.CompactionRevision
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err = n.ReadNeedleMeta(v.DataBackend, nv.Offset.ToActualOffset(), readSize, v.Version())
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if err == needle.ErrorSizeMismatch && OffsetSize == 4 {
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readOption.IsOutOfRange = true
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err = n.ReadNeedleMeta(v.DataBackend, nv.Offset.ToActualOffset()+int64(MaxPossibleVolumeSize), readSize, v.Version())
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}
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if err != nil {
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return 0, err
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}
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if !n.IsCompressed() && !n.IsChunkedManifest() {
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readOption.IsMetaOnly = true
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}
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}
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if readOption == nil || !readOption.IsMetaOnly {
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err = n.ReadData(v.DataBackend, nv.Offset.ToActualOffset(), readSize, v.Version())
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v.checkReadWriteError(err)
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if err != nil {
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return 0, err
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}
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}
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count = int(n.DataSize)
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if !n.HasTtl() {
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return
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}
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ttlMinutes := n.Ttl.Minutes()
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if ttlMinutes == 0 {
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return
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}
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if !n.HasLastModifiedDate() {
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return
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}
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if time.Now().Before(time.Unix(0, int64(n.AppendAtNs)).Add(time.Duration(ttlMinutes) * time.Minute)) {
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return
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}
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return -1, ErrorNotFound
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}
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// read needle at a specific offset
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func (v *Volume) readNeedleMetaAt(n *needle.Needle, offset int64, size int32) (err error) {
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v.dataFileAccessLock.RLock()
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defer v.dataFileAccessLock.RUnlock()
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// read deleted needle meta data
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if size < 0 {
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size = 0
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}
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err = n.ReadNeedleMeta(v.DataBackend, offset, Size(size), v.Version())
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if err == needle.ErrorSizeMismatch && OffsetSize == 4 {
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err = n.ReadNeedleMeta(v.DataBackend, offset+int64(MaxPossibleVolumeSize), Size(size), v.Version())
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}
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if err != nil {
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return err
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}
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return 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) readNeedleDataInto(n *needle.Needle, readOption *ReadOption, writer io.Writer, offset int64, size int64) (err error) {
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if !readOption.HasSlowRead {
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v.dataFileAccessLock.RLock()
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defer v.dataFileAccessLock.RUnlock()
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}
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if readOption.HasSlowRead {
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v.dataFileAccessLock.RLock()
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}
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nv, ok := v.nm.Get(n.Id)
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if readOption.HasSlowRead {
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v.dataFileAccessLock.RUnlock()
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}
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if !ok || nv.Offset.IsZero() {
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return ErrorNotFound
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}
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readSize := nv.Size
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if readSize.IsDeleted() {
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if readOption != nil && readOption.ReadDeleted && readSize != TombstoneFileSize {
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glog.V(3).Infof("reading deleted %s", n.String())
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readSize = -readSize
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} else {
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return ErrorDeleted
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}
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}
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if readSize == 0 {
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return nil
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}
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actualOffset := nv.Offset.ToActualOffset()
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if readOption.IsOutOfRange {
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actualOffset += int64(MaxPossibleVolumeSize)
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}
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buf := mem.Allocate(min(readOption.ReadBufferSize, int(size)))
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defer mem.Free(buf)
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// read needle data
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crc := needle.CRC(0)
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for x := offset; x < offset+size; x += int64(len(buf)) {
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if readOption.HasSlowRead {
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v.dataFileAccessLock.RLock()
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}
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// possibly re-read needle offset if volume is compacted
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if readOption.VolumeRevision != v.SuperBlock.CompactionRevision {
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// the volume is compacted
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nv, ok = v.nm.Get(n.Id)
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if !ok || nv.Offset.IsZero() {
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if readOption.HasSlowRead {
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v.dataFileAccessLock.RUnlock()
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}
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return ErrorNotFound
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}
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actualOffset = nv.Offset.ToActualOffset()
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readOption.VolumeRevision = v.SuperBlock.CompactionRevision
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}
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count, err := n.ReadNeedleData(v.DataBackend, actualOffset, buf, x)
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if readOption.HasSlowRead {
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v.dataFileAccessLock.RUnlock()
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}
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toWrite := min(count, int(offset+size-x))
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if toWrite > 0 {
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crc = crc.Update(buf[0:toWrite])
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// the crc.Value() function is to be deprecated. this double checking is for backward compatibility
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// with seaweed version using crc.Value() instead of uint32(crc), which appears in commit 056c480eb
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// and switch appeared in version 3.09.
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if offset == 0 && size == int64(n.DataSize) && int64(count) == size && (n.Checksum != crc && uint32(n.Checksum) != crc.Value()) {
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// This check works only if the buffer is big enough to hold the whole needle data
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// and we ask for all needle data.
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// Otherwise we cannot check the validity of partially aquired data.
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stats.VolumeServerHandlerCounter.WithLabelValues(stats.ErrorCRC).Inc()
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return fmt.Errorf("ReadNeedleData checksum %v expected %v for Needle: %v,%v", crc, n.Checksum, v.Id, n)
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}
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if _, err = writer.Write(buf[0:toWrite]); err != nil {
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return fmt.Errorf("ReadNeedleData write: %v", err)
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}
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}
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if err != nil {
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if err == io.EOF {
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err = nil
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break
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}
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return fmt.Errorf("ReadNeedleData: %v", err)
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}
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if count <= 0 {
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break
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}
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}
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if offset == 0 && size == int64(n.DataSize) && (n.Checksum != crc && uint32(n.Checksum) != crc.Value()) {
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// the crc.Value() function is to be deprecated. this double checking is for backward compatibility
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// with seaweed version using crc.Value() instead of uint32(crc), which appears in commit 056c480eb
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// and switch appeared in version 3.09.
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stats.VolumeServerHandlerCounter.WithLabelValues(stats.ErrorCRC).Inc()
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return fmt.Errorf("ReadNeedleData checksum %v expected %v for Needle: %v,%v", crc, n.Checksum, v.Id, n)
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}
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return nil
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}
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func min(x, y int) int {
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if x < y {
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return x
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}
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return y
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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) ReadNeedleBlob(offset int64, size Size) ([]byte, error) {
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v.dataFileAccessLock.RLock()
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defer v.dataFileAccessLock.RUnlock()
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return needle.ReadNeedleBlob(v.DataBackend, offset, size, v.Version())
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}
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type VolumeFileScanner interface {
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VisitSuperBlock(super_block.SuperBlock) error
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ReadNeedleBody() bool
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VisitNeedle(n *needle.Needle, offset int64, needleHeader, needleBody []byte) error
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}
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func ScanVolumeFile(dirname string, collection string, id needle.VolumeId,
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needleMapKind NeedleMapKind,
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volumeFileScanner VolumeFileScanner) (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 = volumeFileScanner.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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defer v.Close()
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version := v.Version()
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offset := int64(v.SuperBlock.BlockSize())
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return ScanVolumeFileFrom(version, v.DataBackend, offset, volumeFileScanner)
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}
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func ScanVolumeFileFrom(version needle.Version, datBackend backend.BackendStorageFile, offset int64, volumeFileScanner VolumeFileScanner) (err error) {
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n, nh, rest, e := needle.ReadNeedleHeader(datBackend, version, offset)
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if e != nil {
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if e == io.EOF {
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return nil
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}
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return fmt.Errorf("cannot read %s at offset %d: %v", datBackend.Name(), offset, e)
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}
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for n != nil {
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var needleBody []byte
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if volumeFileScanner.ReadNeedleBody() {
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// println("needle", n.Id.String(), "offset", offset, "size", n.Size, "rest", rest)
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if needleBody, err = n.ReadNeedleBody(datBackend, version, offset+NeedleHeaderSize, rest); err != nil {
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glog.V(0).Infof("cannot read needle head [%d, %d) body [%d, %d) body length %d: %v", offset, offset+NeedleHeaderSize, offset+NeedleHeaderSize, offset+NeedleHeaderSize+rest, rest, 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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}
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err := volumeFileScanner.VisitNeedle(n, offset, nh, needleBody)
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if err == io.EOF {
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return nil
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}
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if err != nil {
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glog.V(0).Infof("visit needle error: %v", err)
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return fmt.Errorf("visit needle error: %v", err)
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}
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offset += NeedleHeaderSize + rest
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glog.V(4).Infof("==> new entry offset %d", offset)
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if n, nh, rest, err = needle.ReadNeedleHeader(datBackend, 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 at offset %d: %v", offset, 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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return nil
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}
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