add bloom filter for filer leveldb/rocksdb

weed/filer/leveldb2/leveldb2_store.go

@@ -5,12 +5,14 @@ import (
 	"context"
 	"crypto/md5"
 	"fmt"
+	"io"
+	"os"
+
 	"github.com/syndtr/goleveldb/leveldb"
 	leveldb_errors "github.com/syndtr/goleveldb/leveldb/errors"
+	"github.com/syndtr/goleveldb/leveldb/filter"
 	"github.com/syndtr/goleveldb/leveldb/opt"
 	leveldb_util "github.com/syndtr/goleveldb/leveldb/util"
-	"io"
-	"os"
 
 	"github.com/chrislusf/seaweedfs/weed/filer"
 	"github.com/chrislusf/seaweedfs/weed/glog"
@@ -47,6 +49,7 @@ func (store *LevelDB2Store) initialize(dir string, dbCount int) (err error) {
 		BlockCacheCapacity:            32 * 1024 * 1024, // default value is 8MiB
 		WriteBuffer:                   16 * 1024 * 1024, // default value is 4MiB
 		CompactionTableSizeMultiplier: 4,
+		Filter:                        filter.NewBloomFilter(8), // false positive rate 0.02
 	}
 
 	for d := 0; d < dbCount; d++ {

weed/filer/leveldb3/leveldb3_store.go

@@ -5,15 +5,17 @@ import (
 	"context"
 	"crypto/md5"
 	"fmt"
-	"github.com/syndtr/goleveldb/leveldb"
-	leveldb_errors "github.com/syndtr/goleveldb/leveldb/errors"
-	"github.com/syndtr/goleveldb/leveldb/opt"
-	leveldb_util "github.com/syndtr/goleveldb/leveldb/util"
 	"io"
 	"os"
 	"strings"
 	"sync"
 
+	"github.com/syndtr/goleveldb/leveldb"
+	leveldb_errors "github.com/syndtr/goleveldb/leveldb/errors"
+	"github.com/syndtr/goleveldb/leveldb/filter"
+	"github.com/syndtr/goleveldb/leveldb/opt"
+	leveldb_util "github.com/syndtr/goleveldb/leveldb/util"
+
 	"github.com/chrislusf/seaweedfs/weed/filer"
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
@@ -62,17 +64,19 @@ func (store *LevelDB3Store) initialize(dir string) (err error) {
 }
 
 func (store *LevelDB3Store) loadDB(name string) (*leveldb.DB, error) {
-
+	bloom := filter.NewBloomFilter(8) // false positive rate 0.02
 	opts := &opt.Options{
 		BlockCacheCapacity:            32 * 1024 * 1024, // default value is 8MiB
 		WriteBuffer:                   16 * 1024 * 1024, // default value is 4MiB
 		CompactionTableSizeMultiplier: 4,
+		Filter:                        bloom,
 	}
 	if name != DEFAULT {
 		opts = &opt.Options{
 			BlockCacheCapacity:            4 * 1024 * 1024, // default value is 8MiB
 			WriteBuffer:                   2 * 1024 * 1024, // default value is 4MiB
 			CompactionTableSizeMultiplier: 4,
+			Filter:                        bloom,
 		}
 	}
 

weed/filer/rocksdb/rocksdb_store.go

@@ -24,18 +24,21 @@ func init() {
 
 type options struct {
 	opt *gorocksdb.Options
+	bto *gorocksdb.BlockBasedTableOptions
 	ro  *gorocksdb.ReadOptions
 	wo  *gorocksdb.WriteOptions
 }
 
 func (opt *options) init() {
 	opt.opt = gorocksdb.NewDefaultOptions()
+	opt.bto = gorocksdb.NewDefaultBlockBasedTableOptions()
 	opt.ro = gorocksdb.NewDefaultReadOptions()
 	opt.wo = gorocksdb.NewDefaultWriteOptions()
 }
 
 func (opt *options) close() {
 	opt.opt.Destroy()
+	opt.bto.Destroy()
 	opt.ro.Destroy()
 	opt.wo.Destroy()
 }
@@ -69,6 +72,11 @@ func (store *RocksDBStore) initialize(dir string) (err error) {
 	store.opt.SetCompactionFilter(NewTTLFilter())
 	// store.opt.SetMaxBackgroundCompactions(2)
 
+	// https://github.com/tecbot/gorocksdb/issues/132
+	store.bto.SetFilterPolicy(gorocksdb.NewBloomFilterFull(8))
+	store.opt.SetBlockBasedTableFactory(store.bto)
+	// store.opt.EnableStatistics()
+
 	store.db, err = gorocksdb.OpenDb(store.opt, dir)
 
 	return