Merge branch 'add_rocksdb'

go.mod

@@ -66,6 +66,7 @@ require (
 	github.com/spf13/viper v1.4.0
 	github.com/stretchr/testify v1.6.1
 	github.com/syndtr/goleveldb v1.0.0
+	github.com/tecbot/gorocksdb v0.0.0-20191217155057-f0fad39f321c
 	github.com/tidwall/gjson v1.3.2
 	github.com/tidwall/match v1.0.1
 	github.com/tsuna/gohbase v0.0.0-20201125011725-348991136365

go.sum

@@ -225,6 +225,7 @@ github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6/go.mod h1:cIg4er
 github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
 github.com/golang/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
 github.com/golang/mock v1.3.1/go.mod h1:sBzyDLLjw3U8JLTeZvSv8jJB+tU5PVekmnlKIyFUx0Y=
+github.com/golang/mock v1.4.3 h1:GV+pQPG/EUUbkh47niozDcADz6go/dUwhVzdUQHIVRw=
 github.com/golang/mock v1.4.3/go.mod h1:UOMv5ysSaYNkG+OFQykRIcU/QvvxJf3p21QfJ2Bt3cw=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
@@ -542,6 +543,7 @@ github.com/rcrowley/go-metrics v0.0.0-20181016184325-3113b8401b8a h1:9ZKAASQSHhD
 github.com/rcrowley/go-metrics v0.0.0-20181016184325-3113b8401b8a/go.mod h1:bCqnVzQkZxMG4s8nGwiZ5l3QUCyqpo9Y+/ZMZ9VjZe4=
 github.com/rcrowley/go-metrics v0.0.0-20190826022208-cac0b30c2563 h1:dY6ETXrvDG7Sa4vE8ZQG4yqWg6UnOcbqTAahkV813vQ=
 github.com/rcrowley/go-metrics v0.0.0-20190826022208-cac0b30c2563/go.mod h1:bCqnVzQkZxMG4s8nGwiZ5l3QUCyqpo9Y+/ZMZ9VjZe4=
+github.com/remyoudompheng/bigfft v0.0.0-20200410134404-eec4a21b6bb0 h1:OdAsTTz6OkFY5QxjkYwrChwuRruF69c169dPK26NUlk=
 github.com/remyoudompheng/bigfft v0.0.0-20200410134404-eec4a21b6bb0/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
 github.com/rogpeppe/fastuuid v0.0.0-20150106093220-6724a57986af/go.mod h1:XWv6SoW27p1b0cqNHllgS5HIMJraePCO15w5zCzIWYg=
 github.com/rogpeppe/go-internal v1.1.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
@@ -551,8 +553,6 @@ github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQD
 github.com/ryanuber/columnize v0.0.0-20160712163229-9b3edd62028f/go.mod h1:sm1tb6uqfes/u+d4ooFouqFdy9/2g9QGwK3SQygK0Ts=
 github.com/samuel/go-zookeeper v0.0.0-20190923202752-2cc03de413da/go.mod h1:gi+0XIa01GRL2eRQVjQkKGqKF3SF9vZR/HnPullcV2E=
 github.com/sean-/seed v0.0.0-20170313163322-e2103e2c3529/go.mod h1:DxrIzT+xaE7yg65j358z/aeFdxmN0P9QXhEzd20vsDc=
-github.com/seaweedfs/fuse v1.0.7 h1:tESMXhI3gXzN+dlWsCUrkIZDiWA4dZX18rQMoqmvazw=
-github.com/seaweedfs/fuse v1.0.7/go.mod h1:W7ubwr1l7KQsMeUpxFFOFOSxUL/ucTRMAlVYs4xdfQ8=
 github.com/seaweedfs/fuse v1.0.8 h1:HBPJTC77OlxwSd2JiTwvLPn8bWTElqQp3xs9vf3C15s=
 github.com/seaweedfs/fuse v1.0.8/go.mod h1:W7ubwr1l7KQsMeUpxFFOFOSxUL/ucTRMAlVYs4xdfQ8=
 github.com/seaweedfs/goexif v1.0.2 h1:p+rTXYdQ2mgxd+1JaTrQ9N8DvYuw9UH9xgYmJ+Bb29E=
@@ -618,6 +618,8 @@ github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/syndtr/goleveldb v1.0.0 h1:fBdIW9lB4Iz0n9khmH8w27SJ3QEJ7+IgjPEwGSZiFdE=
 github.com/syndtr/goleveldb v1.0.0/go.mod h1:ZVVdQEZoIme9iO1Ch2Jdy24qqXrMMOU6lpPAyBWyWuQ=
+github.com/tecbot/gorocksdb v0.0.0-20191217155057-f0fad39f321c h1:g+WoO5jjkqGAzHWCjJB1zZfXPIAaDpzXIEJ0eS6B5Ok=
+github.com/tecbot/gorocksdb v0.0.0-20191217155057-f0fad39f321c/go.mod h1:ahpPrc7HpcfEWDQRZEmnXMzHY03mLDYMCxeDzy46i+8=
 github.com/tidwall/gjson v1.3.2 h1:+7p3qQFaH3fOMXAJSrdZwGKcOO/lYdGS0HqGhPqDdTI=
 github.com/tidwall/gjson v1.3.2/go.mod h1:P256ACg0Mn+j1RXIDXoss50DeIABTYK1PULOJHhxOls=
 github.com/tidwall/match v1.0.1 h1:PnKP62LPNxHKTwvHHZZzdOAOCtsJTjo6dZLCwpKm5xc=
@@ -941,7 +943,9 @@ honnef.co/go/tools v0.0.1-2019.2.3 h1:3JgtbtFHMiCmsznwGVTUWbgGov+pVqnlf1dEJTNAXe
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
 modernc.org/b v1.0.0 h1:vpvqeyp17ddcQWF29Czawql4lDdABCDRbXRAS4+aF2o=
 modernc.org/b v1.0.0/go.mod h1:uZWcZfRj1BpYzfN9JTerzlNUnnPsV9O2ZA8JsRcubNg=
+modernc.org/mathutil v1.1.1 h1:FeylZSVX8S+58VsyJlkEj2bcpdytmp9MmDKZkKx8OIE=
 modernc.org/mathutil v1.1.1/go.mod h1:mZW8CKdRPY1v87qxC/wUdX5O1qDzXMP5TH3wjfpga6E=
+modernc.org/strutil v1.1.0 h1:+1/yCzZxY2pZwwrsbH+4T7BQMoLQ9QiBshRC9eicYsc=
 modernc.org/strutil v1.1.0/go.mod h1:lstksw84oURvj9y3tn8lGvRxyRC1S2+g5uuIzNfIOBs=
 pack.ag/amqp v0.11.2/go.mod h1:4/cbmt4EJXSKlG6LCfWHoqmN0uFdy5i/+YFz+fTfhV4=
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=

weed/command/scaffold.go

@@ -87,7 +87,13 @@ buckets_folder = "/buckets"
 # local on disk, mostly for simple single-machine setup, fairly scalable
 # faster than previous leveldb, recommended.
 enabled = true
-dir = "."					# directory to store level db files
+dir = "./filerldb2"					# directory to store level db files
+
+[rocksdb]
+# local on disk, similar to leveldb
+# since it is using a C wrapper, you need to install rocksdb and build it by yourself
+enabled = false
+dir = "./filerrdb"					# directory to store rocksdb files
 
 [mysql]  # or tidb
 # CREATE TABLE IF NOT EXISTS filemeta (

weed/filer/leveldb/leveldb_store_test.go

@@ -2,9 +2,11 @@ package leveldb
 
 import (
 	"context"
+	"fmt"
 	"io/ioutil"
 	"os"
 	"testing"
+	"time"
 
 	"github.com/chrislusf/seaweedfs/weed/filer"
 	"github.com/chrislusf/seaweedfs/weed/util"
@@ -86,3 +88,28 @@ func TestEmptyRoot(t *testing.T) {
 	}
 
 }
+
+func BenchmarkInsertEntry(b *testing.B) {
+	testFiler := filer.NewFiler(nil, nil, "", 0, "", "", "", nil)
+	dir, _ := ioutil.TempDir("", "seaweedfs_filer_bench")
+	defer os.RemoveAll(dir)
+	store := &LevelDBStore{}
+	store.initialize(dir)
+	testFiler.SetStore(store)
+
+	ctx := context.Background()
+
+	b.ReportAllocs()
+
+	for i := 0; i < b.N; i++ {
+		entry := &filer.Entry{
+			FullPath: util.FullPath(fmt.Sprintf("/file%d.txt", i)),
+			Attr: filer.Attr{
+				Crtime: time.Now(),
+				Mtime:  time.Now(),
+				Mode:   os.FileMode(0644),
+			},
+		}
+		store.InsertEntry(ctx, entry)
+	}
+}

weed/filer/rocksdb/README.md

@@ -0,0 +1,41 @@
+# Prepare the compilation environment on linux
+- sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
+- sudo apt-get update -qq
+- sudo apt-get install gcc-6 g++-6 libsnappy-dev zlib1g-dev libbz2-dev -qq
+- export CXX="g++-6" CC="gcc-6"
+
+- wget https://launchpad.net/ubuntu/+archive/primary/+files/libgflags2_2.0-1.1ubuntu1_amd64.deb
+- sudo dpkg -i libgflags2_2.0-1.1ubuntu1_amd64.deb
+- wget https://launchpad.net/ubuntu/+archive/primary/+files/libgflags-dev_2.0-1.1ubuntu1_amd64.deb
+- sudo dpkg -i libgflags-dev_2.0-1.1ubuntu1_amd64.deb
+
+# Prepare the compilation environment on mac os
+```
+brew install snappy
+```
+
+# install rocksdb:
+```
+ export ROCKSDB_HOME=/Users/chris/dev/rocksdb
+
+ git clone https://github.com/facebook/rocksdb.git $ROCKSDB_HOME
+ pushd $ROCKSDB_HOME
+ make clean
+ make install-static
+ popd
+```
+
+# install gorocksdb
+
+```
+export CGO_CFLAGS="-I$ROCKSDB_HOME/include"
+export CGO_LDFLAGS="-L$ROCKSDB_HOME -lrocksdb -lstdc++ -lm -lz -lbz2 -lsnappy -llz4 -lzstd"
+
+go get github.com/tecbot/gorocksdb
+```
+# compile with rocksdb
+
+```
+cd ~/go/src/github.com/chrislusf/seaweedfs/weed
+go install -tags rocksdb
+```

weed/filer/rocksdb/rocksdb_store.go

@@ -0,0 +1,293 @@
+// +build rocksdb
+
+package rocksdb
+
+import (
+	"bytes"
+	"context"
+	"crypto/md5"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/filer"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	weed_util "github.com/chrislusf/seaweedfs/weed/util"
+	"github.com/tecbot/gorocksdb"
+	"io"
+)
+
+func init() {
+	filer.Stores = append(filer.Stores, &RocksDBStore{})
+}
+
+type RocksDBStore struct {
+	path string
+	db   *gorocksdb.DB
+}
+
+func (store *RocksDBStore) GetName() string {
+	return "rocksdb"
+}
+
+func (store *RocksDBStore) Initialize(configuration weed_util.Configuration, prefix string) (err error) {
+	dir := configuration.GetString(prefix + "dir")
+	return store.initialize(dir)
+}
+
+func (store *RocksDBStore) initialize(dir string) (err error) {
+	glog.Infof("filer store rocksdb dir: %s", dir)
+	if err := weed_util.TestFolderWritable(dir); err != nil {
+		return fmt.Errorf("Check Level Folder %s Writable: %s", dir, err)
+	}
+
+	options := gorocksdb.NewDefaultOptions()
+	options.SetCreateIfMissing(true)
+	store.db, err = gorocksdb.OpenDb(options, dir)
+
+	return
+}
+
+func (store *RocksDBStore) BeginTransaction(ctx context.Context) (context.Context, error) {
+	return ctx, nil
+}
+func (store *RocksDBStore) CommitTransaction(ctx context.Context) error {
+	return nil
+}
+func (store *RocksDBStore) RollbackTransaction(ctx context.Context) error {
+	return nil
+}
+
+func (store *RocksDBStore) InsertEntry(ctx context.Context, entry *filer.Entry) (err error) {
+	dir, name := entry.DirAndName()
+	key := genKey(dir, name)
+
+	value, err := entry.EncodeAttributesAndChunks()
+	if err != nil {
+		return fmt.Errorf("encoding %s %+v: %v", entry.FullPath, entry.Attr, err)
+	}
+
+	wo := gorocksdb.NewDefaultWriteOptions()
+	err = store.db.Put(wo, key, value)
+
+	if err != nil {
+		return fmt.Errorf("persisting %s : %v", entry.FullPath, err)
+	}
+
+	// println("saved", entry.FullPath, "chunks", len(entry.Chunks))
+
+	return nil
+}
+
+func (store *RocksDBStore) UpdateEntry(ctx context.Context, entry *filer.Entry) (err error) {
+
+	return store.InsertEntry(ctx, entry)
+}
+
+func (store *RocksDBStore) FindEntry(ctx context.Context, fullpath weed_util.FullPath) (entry *filer.Entry, err error) {
+	dir, name := fullpath.DirAndName()
+	key := genKey(dir, name)
+
+	ro := gorocksdb.NewDefaultReadOptions()
+	data, err := store.db.GetBytes(ro, key)
+
+	if data == nil {
+		return nil, filer_pb.ErrNotFound
+	}
+	if err != nil {
+		return nil, fmt.Errorf("get %s : %v", entry.FullPath, err)
+	}
+
+	entry = &filer.Entry{
+		FullPath: fullpath,
+	}
+	err = entry.DecodeAttributesAndChunks(weed_util.MaybeDecompressData(data))
+	if err != nil {
+		return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
+	}
+
+	// println("read", entry.FullPath, "chunks", len(entry.Chunks), "data", len(data), string(data))
+
+	return entry, nil
+}
+
+func (store *RocksDBStore) DeleteEntry(ctx context.Context, fullpath weed_util.FullPath) (err error) {
+	dir, name := fullpath.DirAndName()
+	key := genKey(dir, name)
+
+	wo := gorocksdb.NewDefaultWriteOptions()
+	err = store.db.Delete(wo, key)
+	if err != nil {
+		return fmt.Errorf("delete %s : %v", fullpath, err)
+	}
+
+	return nil
+}
+
+func (store *RocksDBStore) DeleteFolderChildren(ctx context.Context, fullpath weed_util.FullPath) (err error) {
+	directoryPrefix := genDirectoryKeyPrefix(fullpath, "")
+
+	batch := new(gorocksdb.WriteBatch)
+
+	ro := gorocksdb.NewDefaultReadOptions()
+	ro.SetFillCache(false)
+	iter := store.db.NewIterator(ro)
+	defer iter.Close()
+	err = enumerate(iter, directoryPrefix, nil, false, -1, func(key, value []byte) bool {
+		batch.Delete(key)
+		return true
+	})
+	if err != nil {
+		return fmt.Errorf("delete list %s : %v", fullpath, err)
+	}
+
+	wo := gorocksdb.NewDefaultWriteOptions()
+	err = store.db.Write(wo, batch)
+
+	if err != nil {
+		return fmt.Errorf("delete %s : %v", fullpath, err)
+	}
+
+	return nil
+}
+
+func enumerate(iter *gorocksdb.Iterator, prefix, lastKey []byte, includeLastKey bool, limit int, fn func(key, value []byte) bool) error {
+
+	if len(lastKey) == 0 {
+		iter.Seek(prefix)
+	} else {
+		iter.Seek(lastKey)
+
+		if !includeLastKey {
+			k := iter.Key()
+			v := iter.Value()
+			key := k.Data()
+			defer k.Free()
+			defer v.Free()
+
+			if !bytes.HasPrefix(key, prefix) {
+				return nil
+			}
+
+			if bytes.Equal(key, lastKey) {
+				iter.Next()
+			}
+
+		}
+	}
+
+	i := 0
+	for ; iter.Valid(); iter.Next() {
+
+		if limit > 0 {
+			i++
+			if i > limit {
+				break
+			}
+		}
+
+		k := iter.Key()
+		v := iter.Value()
+		key := k.Data()
+		value := v.Data()
+
+		if !bytes.HasPrefix(key, prefix) {
+			k.Free()
+			v.Free()
+			break
+		}
+
+		ret := fn(key, value)
+
+		k.Free()
+		v.Free()
+
+		if !ret {
+			break
+		}
+
+	}
+
+	if err := iter.Err(); err != nil {
+		return fmt.Errorf("prefix scan iterator: %v", err)
+	}
+	return nil
+}
+
+func (store *RocksDBStore) ListDirectoryEntries(ctx context.Context, fullpath weed_util.FullPath, startFileName string, inclusive bool,
+	limit int) (entries []*filer.Entry, err error) {
+	return store.ListDirectoryPrefixedEntries(ctx, fullpath, startFileName, inclusive, limit, "")
+}
+
+func (store *RocksDBStore) ListDirectoryPrefixedEntries(ctx context.Context, fullpath weed_util.FullPath, startFileName string, inclusive bool, limit int, prefix string) (entries []*filer.Entry, err error) {
+
+	directoryPrefix := genDirectoryKeyPrefix(fullpath, prefix)
+	lastFileStart := directoryPrefix
+	if startFileName != "" {
+		lastFileStart = genDirectoryKeyPrefix(fullpath, startFileName)
+	}
+
+	ro := gorocksdb.NewDefaultReadOptions()
+	ro.SetFillCache(false)
+	iter := store.db.NewIterator(ro)
+	defer iter.Close()
+	err = enumerate(iter, directoryPrefix, lastFileStart, inclusive, limit, func(key, value []byte) bool {
+		fileName := getNameFromKey(key)
+		if fileName == "" {
+			return true
+		}
+		limit--
+		if limit < 0 {
+			return false
+		}
+		entry := &filer.Entry{
+			FullPath: weed_util.NewFullPath(string(fullpath), fileName),
+		}
+
+		// println("list", entry.FullPath, "chunks", len(entry.Chunks))
+		if decodeErr := entry.DecodeAttributesAndChunks(weed_util.MaybeDecompressData(value)); decodeErr != nil {
+			err = decodeErr
+			glog.V(0).Infof("list %s : %v", entry.FullPath, err)
+			return false
+		}
+		entries = append(entries, entry)
+		return true
+	})
+	if err != nil {
+		return entries, fmt.Errorf("prefix list %s : %v", fullpath, err)
+	}
+
+	return entries, err
+}
+
+func genKey(dirPath, fileName string) (key []byte) {
+	key = hashToBytes(dirPath)
+	key = append(key, []byte(fileName)...)
+	return key
+}
+
+func genDirectoryKeyPrefix(fullpath weed_util.FullPath, startFileName string) (keyPrefix []byte) {
+	keyPrefix = hashToBytes(string(fullpath))
+	if len(startFileName) > 0 {
+		keyPrefix = append(keyPrefix, []byte(startFileName)...)
+	}
+	return keyPrefix
+}
+
+func getNameFromKey(key []byte) string {
+
+	return string(key[md5.Size:])
+
+}
+
+// hash directory, and use last byte for partitioning
+func hashToBytes(dir string) []byte {
+	h := md5.New()
+	io.WriteString(h, dir)
+
+	b := h.Sum(nil)
+
+	return b
+}
+
+func (store *RocksDBStore) Shutdown() {
+	store.db.Close()
+}

weed/filer/rocksdb/rocksdb_store_kv.go

@@ -0,0 +1,51 @@
+// +build rocksdb
+
+package rocksdb
+
+import (
+	"context"
+	"fmt"
+	"github.com/tecbot/gorocksdb"
+
+	"github.com/chrislusf/seaweedfs/weed/filer"
+)
+
+func (store *RocksDBStore) KvPut(ctx context.Context, key []byte, value []byte) (err error) {
+
+	wo := gorocksdb.NewDefaultWriteOptions()
+	err = store.db.Put(wo, key, value)
+
+	if err != nil {
+		return fmt.Errorf("kv put: %v", err)
+	}
+
+	return nil
+}
+
+func (store *RocksDBStore) KvGet(ctx context.Context, key []byte) (value []byte, err error) {
+
+	ro := gorocksdb.NewDefaultReadOptions()
+	value, err = store.db.GetBytes(ro, key)
+
+	if value == nil {
+		return nil, filer.ErrKvNotFound
+	}
+
+	if err != nil {
+		return nil, fmt.Errorf("kv get: %v", err)
+	}
+
+	return
+}
+
+func (store *RocksDBStore) KvDelete(ctx context.Context, key []byte) (err error) {
+
+	wo := gorocksdb.NewDefaultWriteOptions()
+	err = store.db.Delete(wo, key)
+
+	if err != nil {
+		return fmt.Errorf("kv delete: %v", err)
+	}
+
+	return nil
+}

weed/filer/rocksdb/rocksdb_store_test.go

@@ -0,0 +1,117 @@
+// +build rocksdb
+
+package rocksdb
+
+import (
+	"context"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"testing"
+	"time"
+
+	"github.com/chrislusf/seaweedfs/weed/filer"
+	"github.com/chrislusf/seaweedfs/weed/util"
+)
+
+func TestCreateAndFind(t *testing.T) {
+	testFiler := filer.NewFiler(nil, nil, "", 0, "", "", "", nil)
+	dir, _ := ioutil.TempDir("", "seaweedfs_filer_test")
+	defer os.RemoveAll(dir)
+	store := &RocksDBStore{}
+	store.initialize(dir)
+	testFiler.SetStore(store)
+
+	fullpath := util.FullPath("/home/chris/this/is/one/file1.jpg")
+
+	ctx := context.Background()
+
+	entry1 := &filer.Entry{
+		FullPath: fullpath,
+		Attr: filer.Attr{
+			Mode: 0440,
+			Uid:  1234,
+			Gid:  5678,
+		},
+	}
+
+	if err := testFiler.CreateEntry(ctx, entry1, false, false, nil); err != nil {
+		t.Errorf("create entry %v: %v", entry1.FullPath, err)
+		return
+	}
+
+	entry, err := testFiler.FindEntry(ctx, fullpath)
+
+	if err != nil {
+		t.Errorf("find entry: %v", err)
+		return
+	}
+
+	if entry.FullPath != entry1.FullPath {
+		t.Errorf("find wrong entry: %v", entry.FullPath)
+		return
+	}
+
+	// checking one upper directory
+	entries, _ := testFiler.ListDirectoryEntries(ctx, util.FullPath("/home/chris/this/is/one"), "", false, 100, "", "")
+	if len(entries) != 1 {
+		t.Errorf("list entries count: %v", len(entries))
+		return
+	}
+
+	// checking one upper directory
+	entries, _ = testFiler.ListDirectoryEntries(ctx, util.FullPath("/"), "", false, 100, "", "")
+	if len(entries) != 1 {
+		t.Errorf("list entries count: %v", len(entries))
+		return
+	}
+
+}
+
+func TestEmptyRoot(t *testing.T) {
+	testFiler := filer.NewFiler(nil, nil, "", 0, "", "", "", nil)
+	dir, _ := ioutil.TempDir("", "seaweedfs_filer_test2")
+	defer os.RemoveAll(dir)
+	store := &RocksDBStore{}
+	store.initialize(dir)
+	testFiler.SetStore(store)
+
+	ctx := context.Background()
+
+	// checking one upper directory
+	entries, err := testFiler.ListDirectoryEntries(ctx, util.FullPath("/"), "", false, 100, "", "")
+	if err != nil {
+		t.Errorf("list entries: %v", err)
+		return
+	}
+	if len(entries) != 0 {
+		t.Errorf("list entries count: %v", len(entries))
+		return
+	}
+
+}
+
+func BenchmarkInsertEntry(b *testing.B) {
+	testFiler := filer.NewFiler(nil, nil, "", 0, "", "", "", nil)
+	dir, _ := ioutil.TempDir("", "seaweedfs_filer_bench")
+	defer os.RemoveAll(dir)
+	store := &RocksDBStore{}
+	store.initialize(dir)
+	testFiler.SetStore(store)
+
+	ctx := context.Background()
+
+	b.ReportAllocs()
+
+	for i := 0; i < b.N; i++ {
+		entry := &filer.Entry{
+			FullPath: util.FullPath(fmt.Sprintf("/file%d.txt", i)),
+			Attr: filer.Attr{
+				Crtime: time.Now(),
+				Mtime:  time.Now(),
+				Mode:   os.FileMode(0644),
+			},
+		}
+		store.InsertEntry(ctx, entry)
+	}
+}

weed/server/filer_server_rocksdb.go

@@ -0,0 +1,7 @@
+// +build rocksdb
+
+package weed_server
+
+import (
+	_ "github.com/chrislusf/seaweedfs/weed/filer/rocksdb"
+)