mirror of
https://github.com/chrislusf/seaweedfs
synced 2024-07-02 15:16:51 +02:00
parallelize leveldb
This commit is contained in:
Chris Lu
parent
c5408a4a2d
commit
dcc331cf5a
|
|
@ -6,6 +6,7 @@ import (
|
|||
"crypto/md5"
|
||||
"fmt"
|
||||
"io"
|
||||
"os"
|
||||
|
||||
"github.com/chrislusf/seaweedfs/weed/filer2"
|
||||
"github.com/chrislusf/seaweedfs/weed/glog"
|
||||
|
|
@ -19,10 +20,9 @@ func init() {
|
|||
filer2.Stores = append(filer2.Stores, &LevelDB2Store{})
|
||||
}
|
||||
|
||||
// known theoretically 128 bit MD5 collision of 2 directories.
|
||||
// (but really? please show some real examples)
|
||||
type LevelDB2Store struct {
|
||||
db *leveldb.DB
|
||||
dbs []*leveldb.DB
|
||||
dbCount int
|
||||
}
|
||||
|
||||
func (store *LevelDB2Store) GetName() string {
|
||||
|
|
@ -31,10 +31,10 @@ func (store *LevelDB2Store) GetName() string {
|
|||
|
||||
func (store *LevelDB2Store) Initialize(configuration weed_util.Configuration) (err error) {
|
||||
dir := configuration.GetString("dir")
|
||||
return store.initialize(dir)
|
||||
return store.initialize(dir, 8)
|
||||
}
|
||||
|
||||
func (store *LevelDB2Store) initialize(dir string) (err error) {
|
||||
func (store *LevelDB2Store) initialize(dir string, dbCount int) (err error) {
|
||||
glog.Infof("filer store leveldb2 dir: %s", dir)
|
||||
if err := weed_util.TestFolderWritable(dir); err != nil {
|
||||
return fmt.Errorf("Check Level Folder %s Writable: %s", dir, err)
|
||||
|
|
@ -43,13 +43,21 @@ func (store *LevelDB2Store) initialize(dir string) (err error) {
|
|||
opts := &opt.Options{
|
||||
BlockCacheCapacity: 32 * 1024 * 1024, // default value is 8MiB
|
||||
WriteBuffer: 16 * 1024 * 1024, // default value is 4MiB
|
||||
CompactionTableSizeMultiplier: 10,
|
||||
CompactionTableSizeMultiplier: 4,
|
||||
}
|
||||
|
||||
if store.db, err = leveldb.OpenFile(dir, opts); err != nil {
|
||||
glog.Infof("filer store open dir %s: %v", dir, err)
|
||||
return
|
||||
for d := 0 ; d < dbCount; d++ {
|
||||
dbFolder := fmt.Sprintf("%s/%02d", dir, d)
|
||||
os.MkdirAll(dbFolder, 0755)
|
||||
db, err := leveldb.OpenFile(dbFolder, opts)
|
||||
if err != nil {
|
||||
glog.Errorf("filer store open dir %s: %v", dbFolder, err)
|
||||
return
|
||||
}
|
||||
store.dbs = append(store.dbs, db)
|
||||
}
|
||||
store.dbCount = dbCount
|
||||
|
||||
return
|
||||
}
|
||||
|
||||
|
|
@ -64,14 +72,15 @@ func (store *LevelDB2Store) RollbackTransaction(ctx context.Context) error {
|
|||
}
|
||||
|
||||
func (store *LevelDB2Store) InsertEntry(ctx context.Context, entry *filer2.Entry) (err error) {
|
||||
key := genKey(entry.DirAndName())
|
||||
dir, name := entry.DirAndName()
|
||||
key, partitionId := genKey(dir, name, store.dbCount)
|
||||
|
||||
value, err := entry.EncodeAttributesAndChunks()
|
||||
if err != nil {
|
||||
return fmt.Errorf("encoding %s %+v: %v", entry.FullPath, entry.Attr, err)
|
||||
}
|
||||
|
||||
err = store.db.Put(key, value, nil)
|
||||
err = store.dbs[partitionId].Put(key, value, nil)
|
||||
|
||||
if err != nil {
|
||||
return fmt.Errorf("persisting %s : %v", entry.FullPath, err)
|
||||
|
|
@ -88,9 +97,10 @@ func (store *LevelDB2Store) UpdateEntry(ctx context.Context, entry *filer2.Entry
|
|||
}
|
||||
|
||||
func (store *LevelDB2Store) FindEntry(ctx context.Context, fullpath filer2.FullPath) (entry *filer2.Entry, err error) {
|
||||
key := genKey(fullpath.DirAndName())
|
||||
dir, name := fullpath.DirAndName()
|
||||
key, partitionId := genKey(dir, name, store.dbCount)
|
||||
|
||||
data, err := store.db.Get(key, nil)
|
||||
data, err := store.dbs[partitionId].Get(key, nil)
|
||||
|
||||
if err == leveldb.ErrNotFound {
|
||||
return nil, filer2.ErrNotFound
|
||||
|
|
@ -107,15 +117,16 @@ func (store *LevelDB2Store) FindEntry(ctx context.Context, fullpath filer2.FullP
|
|||
return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
|
||||
}
|
||||
|
||||
// println("read", entry.FullPath, "chunks", len(entry.Chunks), "data", len(data), string(data))
|
||||
println("read", entry.FullPath, "chunks", len(entry.Chunks), "data", len(data), string(data))
|
||||
|
||||
return entry, nil
|
||||
}
|
||||
|
||||
func (store *LevelDB2Store) DeleteEntry(ctx context.Context, fullpath filer2.FullPath) (err error) {
|
||||
key := genKey(fullpath.DirAndName())
|
||||
dir, name := fullpath.DirAndName()
|
||||
key, partitionId := genKey(dir, name, store.dbCount)
|
||||
|
||||
err = store.db.Delete(key, nil)
|
||||
err = store.dbs[partitionId].Delete(key, nil)
|
||||
if err != nil {
|
||||
return fmt.Errorf("delete %s : %v", fullpath, err)
|
||||
}
|
||||
|
|
@ -126,9 +137,9 @@ func (store *LevelDB2Store) DeleteEntry(ctx context.Context, fullpath filer2.Ful
|
|||
func (store *LevelDB2Store) ListDirectoryEntries(ctx context.Context, fullpath filer2.FullPath, startFileName string, inclusive bool,
|
||||
limit int) (entries []*filer2.Entry, err error) {
|
||||
|
||||
directoryPrefix := genDirectoryKeyPrefix(fullpath, "")
|
||||
directoryPrefix, partitionId := genDirectoryKeyPrefix(fullpath, "", store.dbCount)
|
||||
|
||||
iter := store.db.NewIterator(&leveldb_util.Range{Start: genDirectoryKeyPrefix(fullpath, startFileName)}, nil)
|
||||
iter := store.dbs[partitionId].NewIterator(&leveldb_util.Range{Start: directoryPrefix}, nil)
|
||||
for iter.Next() {
|
||||
key := iter.Key()
|
||||
if !bytes.HasPrefix(key, directoryPrefix) {
|
||||
|
|
@ -148,6 +159,9 @@ func (store *LevelDB2Store) ListDirectoryEntries(ctx context.Context, fullpath f
|
|||
entry := &filer2.Entry{
|
||||
FullPath: filer2.NewFullPath(string(fullpath), fileName),
|
||||
}
|
||||
|
||||
println("list", entry.FullPath, "chunks", len(entry.Chunks))
|
||||
|
||||
if decodeErr := entry.DecodeAttributesAndChunks(iter.Value()); decodeErr != nil {
|
||||
err = decodeErr
|
||||
glog.V(0).Infof("list %s : %v", entry.FullPath, err)
|
||||
|
|
@ -160,31 +174,34 @@ func (store *LevelDB2Store) ListDirectoryEntries(ctx context.Context, fullpath f
|
|||
return entries, err
|
||||
}
|
||||
|
||||
func genKey(dirPath, fileName string) (key []byte) {
|
||||
key = hashToBytes(dirPath)
|
||||
func genKey(dirPath, fileName string, dbCount int) (key []byte, partitionId int) {
|
||||
key, partitionId = hashToBytes(dirPath, dbCount)
|
||||
key = append(key, []byte(fileName)...)
|
||||
return key
|
||||
return key, partitionId
|
||||
}
|
||||
|
||||
func genDirectoryKeyPrefix(fullpath filer2.FullPath, startFileName string) (keyPrefix []byte) {
|
||||
keyPrefix = hashToBytes(string(fullpath))
|
||||
func genDirectoryKeyPrefix(fullpath filer2.FullPath, startFileName string, dbCount int) (keyPrefix []byte, partitionId int) {
|
||||
keyPrefix, partitionId = hashToBytes(string(fullpath), dbCount)
|
||||
if len(startFileName) > 0 {
|
||||
keyPrefix = append(keyPrefix, []byte(startFileName)...)
|
||||
}
|
||||
return keyPrefix
|
||||
return keyPrefix, partitionId
|
||||
}
|
||||
|
||||
func getNameFromKey(key []byte) string {
|
||||
|
||||
return string(key[8:])
|
||||
return string(key[md5.Size:])
|
||||
|
||||
}
|
||||
|
||||
func hashToBytes(dir string) []byte {
|
||||
// hash directory, and use last byte for partitioning
|
||||
func hashToBytes(dir string, dbCount int) ([]byte, int) {
|
||||
h := md5.New()
|
||||
io.WriteString(h, dir)
|
||||
|
||||
b := h.Sum(nil)
|
||||
|
||||
return b
|
||||
x := b[len(b)-1]
|
||||
|
||||
return b, int(x)%dbCount
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue