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https://github.com/seaweedfs/seaweedfs.git
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parallelize leveldb
This commit is contained in:
Chris Lu
parent
c5408a4a2d
commit
dcc331cf5a
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@ -6,6 +6,7 @@ import (
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"crypto/md5"
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"fmt"
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"io"
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"os"
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"github.com/chrislusf/seaweedfs/weed/filer2"
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"github.com/chrislusf/seaweedfs/weed/glog"
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@ -19,10 +20,9 @@ func init() {
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filer2.Stores = append(filer2.Stores, &LevelDB2Store{})
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}
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// known theoretically 128 bit MD5 collision of 2 directories.
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// (but really? please show some real examples)
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type LevelDB2Store struct {
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db *leveldb.DB
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dbs []*leveldb.DB
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dbCount int
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}
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func (store *LevelDB2Store) GetName() string {
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@ -31,10 +31,10 @@ func (store *LevelDB2Store) GetName() string {
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func (store *LevelDB2Store) Initialize(configuration weed_util.Configuration) (err error) {
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dir := configuration.GetString("dir")
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return store.initialize(dir)
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return store.initialize(dir, 8)
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}
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func (store *LevelDB2Store) initialize(dir string) (err error) {
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func (store *LevelDB2Store) initialize(dir string, dbCount int) (err error) {
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glog.Infof("filer store leveldb2 dir: %s", dir)
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if err := weed_util.TestFolderWritable(dir); err != nil {
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return fmt.Errorf("Check Level Folder %s Writable: %s", dir, err)
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@ -43,13 +43,21 @@ func (store *LevelDB2Store) initialize(dir string) (err error) {
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opts := &opt.Options{
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BlockCacheCapacity: 32 * 1024 * 1024, // default value is 8MiB
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WriteBuffer: 16 * 1024 * 1024, // default value is 4MiB
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CompactionTableSizeMultiplier: 10,
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CompactionTableSizeMultiplier: 4,
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}
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if store.db, err = leveldb.OpenFile(dir, opts); err != nil {
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glog.Infof("filer store open dir %s: %v", dir, err)
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return
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for d := 0 ; d < dbCount; d++ {
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dbFolder := fmt.Sprintf("%s/%02d", dir, d)
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os.MkdirAll(dbFolder, 0755)
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db, err := leveldb.OpenFile(dbFolder, opts)
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if err != nil {
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glog.Errorf("filer store open dir %s: %v", dbFolder, err)
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return
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}
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store.dbs = append(store.dbs, db)
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}
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store.dbCount = dbCount
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return
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}
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@ -64,14 +72,15 @@ func (store *LevelDB2Store) RollbackTransaction(ctx context.Context) error {
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}
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func (store *LevelDB2Store) InsertEntry(ctx context.Context, entry *filer2.Entry) (err error) {
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key := genKey(entry.DirAndName())
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dir, name := entry.DirAndName()
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key, partitionId := genKey(dir, name, store.dbCount)
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value, err := entry.EncodeAttributesAndChunks()
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if err != nil {
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return fmt.Errorf("encoding %s %+v: %v", entry.FullPath, entry.Attr, err)
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}
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err = store.db.Put(key, value, nil)
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err = store.dbs[partitionId].Put(key, value, nil)
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if err != nil {
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return fmt.Errorf("persisting %s : %v", entry.FullPath, err)
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@ -88,9 +97,10 @@ func (store *LevelDB2Store) UpdateEntry(ctx context.Context, entry *filer2.Entry
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}
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func (store *LevelDB2Store) FindEntry(ctx context.Context, fullpath filer2.FullPath) (entry *filer2.Entry, err error) {
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key := genKey(fullpath.DirAndName())
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dir, name := fullpath.DirAndName()
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key, partitionId := genKey(dir, name, store.dbCount)
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data, err := store.db.Get(key, nil)
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data, err := store.dbs[partitionId].Get(key, nil)
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if err == leveldb.ErrNotFound {
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return nil, filer2.ErrNotFound
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@ -107,15 +117,16 @@ func (store *LevelDB2Store) FindEntry(ctx context.Context, fullpath filer2.FullP
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return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
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}
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// println("read", entry.FullPath, "chunks", len(entry.Chunks), "data", len(data), string(data))
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println("read", entry.FullPath, "chunks", len(entry.Chunks), "data", len(data), string(data))
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return entry, nil
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}
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func (store *LevelDB2Store) DeleteEntry(ctx context.Context, fullpath filer2.FullPath) (err error) {
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key := genKey(fullpath.DirAndName())
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dir, name := fullpath.DirAndName()
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key, partitionId := genKey(dir, name, store.dbCount)
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err = store.db.Delete(key, nil)
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err = store.dbs[partitionId].Delete(key, nil)
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if err != nil {
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return fmt.Errorf("delete %s : %v", fullpath, err)
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}
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@ -126,9 +137,9 @@ func (store *LevelDB2Store) DeleteEntry(ctx context.Context, fullpath filer2.Ful
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func (store *LevelDB2Store) ListDirectoryEntries(ctx context.Context, fullpath filer2.FullPath, startFileName string, inclusive bool,
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limit int) (entries []*filer2.Entry, err error) {
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directoryPrefix := genDirectoryKeyPrefix(fullpath, "")
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directoryPrefix, partitionId := genDirectoryKeyPrefix(fullpath, "", store.dbCount)
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iter := store.db.NewIterator(&leveldb_util.Range{Start: genDirectoryKeyPrefix(fullpath, startFileName)}, nil)
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iter := store.dbs[partitionId].NewIterator(&leveldb_util.Range{Start: directoryPrefix}, nil)
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for iter.Next() {
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key := iter.Key()
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if !bytes.HasPrefix(key, directoryPrefix) {
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@ -148,6 +159,9 @@ func (store *LevelDB2Store) ListDirectoryEntries(ctx context.Context, fullpath f
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entry := &filer2.Entry{
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FullPath: filer2.NewFullPath(string(fullpath), fileName),
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}
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println("list", entry.FullPath, "chunks", len(entry.Chunks))
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if decodeErr := entry.DecodeAttributesAndChunks(iter.Value()); decodeErr != nil {
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err = decodeErr
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glog.V(0).Infof("list %s : %v", entry.FullPath, err)
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@ -160,31 +174,34 @@ func (store *LevelDB2Store) ListDirectoryEntries(ctx context.Context, fullpath f
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return entries, err
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}
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func genKey(dirPath, fileName string) (key []byte) {
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key = hashToBytes(dirPath)
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func genKey(dirPath, fileName string, dbCount int) (key []byte, partitionId int) {
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key, partitionId = hashToBytes(dirPath, dbCount)
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key = append(key, []byte(fileName)...)
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return key
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return key, partitionId
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}
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func genDirectoryKeyPrefix(fullpath filer2.FullPath, startFileName string) (keyPrefix []byte) {
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keyPrefix = hashToBytes(string(fullpath))
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func genDirectoryKeyPrefix(fullpath filer2.FullPath, startFileName string, dbCount int) (keyPrefix []byte, partitionId int) {
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keyPrefix, partitionId = hashToBytes(string(fullpath), dbCount)
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if len(startFileName) > 0 {
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keyPrefix = append(keyPrefix, []byte(startFileName)...)
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}
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return keyPrefix
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return keyPrefix, partitionId
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}
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func getNameFromKey(key []byte) string {
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return string(key[8:])
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return string(key[md5.Size:])
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}
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func hashToBytes(dir string) []byte {
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// hash directory, and use last byte for partitioning
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func hashToBytes(dir string, dbCount int) ([]byte, int) {
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h := md5.New()
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io.WriteString(h, dir)
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b := h.Sum(nil)
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return b
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x := b[len(b)-1]
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return b, int(x)%dbCount
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}
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