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package erasure_coding
import (
"fmt"
"io"
"os"
"github.com/seaweedfs/seaweedfs/weed/storage/backend"
"github.com/seaweedfs/seaweedfs/weed/storage/idx"
"github.com/seaweedfs/seaweedfs/weed/storage/needle"
"github.com/seaweedfs/seaweedfs/weed/storage/needle_map"
"github.com/seaweedfs/seaweedfs/weed/storage/super_block"
"github.com/seaweedfs/seaweedfs/weed/storage/types"
"github.com/seaweedfs/seaweedfs/weed/util"
)
// EcNoLiveEntriesSubstring is used for server/client coordination when ec.decode determines that
// decoding should be a no-op (all entries are deleted).
const EcNoLiveEntriesSubstring = "has no live entries"
// HasLiveNeedles returns whether the EC index (.ecx) contains at least one live (non-deleted) entry.
// This is used by ec.decode to avoid generating an empty normal volume when all entries were deleted.
func HasLiveNeedles(indexBaseFileName string) (hasLive bool, err error) {
err = iterateEcxFile(indexBaseFileName, func(_ types.NeedleId, _ types.Offset, size types.Size) error {
if !size.IsDeleted() {
hasLive = true
return io.EOF // stop early
}
return nil
})
return
}
// write .idx file from .ecx and .ecj files
func WriteIdxFileFromEcIndex(baseFileName string) (err error) {
ecxFile, openErr := os.OpenFile(baseFileName+".ecx", os.O_RDONLY, 0644)
if openErr != nil {
return fmt.Errorf("cannot open ec index %s.ecx: %v", baseFileName, openErr)
}
defer ecxFile.Close()
idxFile, openErr := os.OpenFile(baseFileName+".idx", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if openErr != nil {
return fmt.Errorf("cannot open %s.idx: %v", baseFileName, openErr)
}
defer idxFile.Close()
io.Copy(idxFile, ecxFile)
err = iterateEcjFile(baseFileName, func(key types.NeedleId) error {
bytes := needle_map.ToBytes(key, types.Offset{}, types.TombstoneFileSize)
idxFile.Write(bytes)
return nil
})
return err
}
// FindDatFileSize calculate .dat file size from max offset entry
// there may be extra deletions after that entry
// but they are deletions anyway
func FindDatFileSize(dataBaseFileName, indexBaseFileName string) (datSize int64, err error) {
version, err := readEcVolumeVersion(dataBaseFileName)
if err != nil {
return 0, fmt.Errorf("read ec volume %s version: %v", dataBaseFileName, err)
}
// Safety: ensure datSize is at least SuperBlockSize. While the caller typically
// checks HasLiveNeedles first, this protects against direct calls to FindDatFileSize
// when all needles are deleted (see issue #7748).
datSize = int64(super_block.SuperBlockSize)
err = iterateEcxFile(indexBaseFileName, func(key types.NeedleId, offset types.Offset, size types.Size) error {
if size.IsDeleted() {
return nil
}
entryStopOffset := offset.ToActualOffset() + needle.GetActualSize(size, version)
if datSize < entryStopOffset {
datSize = entryStopOffset
}
return nil
})
return
}
func readEcVolumeVersion(baseFileName string) (version needle.Version, err error) {
// find volume version
datFile, err := os.OpenFile(baseFileName+".ec00", os.O_RDONLY, 0644)
if err != nil {
return 0, fmt.Errorf("open ec volume %s superblock: %v", baseFileName, err)
}
datBackend := backend.NewDiskFile(datFile)
superBlock, err := super_block.ReadSuperBlock(datBackend)
datBackend.Close()
if err != nil {
return 0, fmt.Errorf("read ec volume %s superblock: %v", baseFileName, err)
}
return superBlock.Version, nil
}
func iterateEcxFile(baseFileName string, processNeedleFn func(key types.NeedleId, offset types.Offset, size types.Size) error) error {
ecxFile, openErr := os.OpenFile(baseFileName+".ecx", os.O_RDONLY, 0644)
if openErr != nil {
return fmt.Errorf("cannot open ec index %s.ecx: %v", baseFileName, openErr)
}
defer ecxFile.Close()
buf := make([]byte, types.NeedleMapEntrySize)
for {
n, err := ecxFile.Read(buf)
if n != types.NeedleMapEntrySize {
if err == io.EOF {
return nil
}
return err
}
key, offset, size := idx.IdxFileEntry(buf)
if processNeedleFn != nil {
err = processNeedleFn(key, offset, size)
}
if err != nil {
if err != io.EOF {
return err
}
return nil
}
}
}
func iterateEcjFile(baseFileName string, processNeedleFn func(key types.NeedleId) error) error {
if !util.FileExists(baseFileName + ".ecj") {
return nil
}
ecjFile, openErr := os.OpenFile(baseFileName+".ecj", os.O_RDONLY, 0644)
if openErr != nil {
return fmt.Errorf("cannot open ec index %s.ecj: %v", baseFileName, openErr)
}
defer ecjFile.Close()
buf := make([]byte, types.NeedleIdSize)
for {
n, err := ecjFile.Read(buf)
if n != types.NeedleIdSize {
if err == io.EOF {
return nil
}
return err
}
if processNeedleFn != nil {
err = processNeedleFn(types.BytesToNeedleId(buf))
}
if err != nil {
if err == io.EOF {
return nil
}
return err
}
}
}
// WriteDatFile generates .dat from .ec00 ~ .ec09 files
func WriteDatFile(baseFileName string, datFileSize int64, shardFileNames []string) error {
datFile, openErr := os.OpenFile(baseFileName+".dat", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if openErr != nil {
return fmt.Errorf("cannot write volume %s.dat: %v", baseFileName, openErr)
}
defer datFile.Close()
inputFiles := make([]*os.File, DataShardsCount)
defer func() {
for shardId := 0; shardId < DataShardsCount; shardId++ {
if inputFiles[shardId] != nil {
inputFiles[shardId].Close()
}
}
}()
for shardId := 0; shardId < DataShardsCount; shardId++ {
inputFiles[shardId], openErr = os.OpenFile(shardFileNames[shardId], os.O_RDONLY, 0)
if openErr != nil {
return openErr
}
}
for datFileSize >= DataShardsCount*ErasureCodingLargeBlockSize {
for shardId := 0; shardId < DataShardsCount; shardId++ {
w, err := io.CopyN(datFile, inputFiles[shardId], ErasureCodingLargeBlockSize)
if w != ErasureCodingLargeBlockSize {
return fmt.Errorf("copy %s large block on shardId %d: %v", baseFileName, shardId, err)
}
datFileSize -= ErasureCodingLargeBlockSize
}
}
for datFileSize > 0 {
for shardId := 0; shardId < DataShardsCount; shardId++ {
toRead := min(datFileSize, ErasureCodingSmallBlockSize)
w, err := io.CopyN(datFile, inputFiles[shardId], toRead)
if w != toRead {
return fmt.Errorf("copy %s small block %d: %v", baseFileName, shardId, err)
}
datFileSize -= toRead
}
}
return nil
}
func min(x, y int64) int64 {
if x > y {
return y
}
return x
}
|
