diff --git a/db.go b/db.go
index cff7d1c..5b9abd1 100755
--- a/db.go
+++ b/db.go
@@ -52,10 +52,6 @@ func New(key Type, params ...string) (db DB, err error) {
 		db, err = NewCache(params...)
 	case LEVELDB:
 		db, err = NewLevelDB(params[0])
-	case MEMCACHE:
-		db, err = NewMemcache(params[0], params[1:]...)
-	case MEMCACHECLUSTER:
-		db, err = NewMemcacheCluster(params[0], params[1:]...)
 	case MONGO:
 		db, err = NewMongo(params[0], params[1:]...)
 	}
diff --git a/db_test.go b/db_test.go
index 67122fe..08f3e98 100755
--- a/db_test.go
+++ b/db_test.go
@@ -146,26 +146,6 @@ func TestImplementations(t *testing.T) {
 		t.Log("$MONGO not set. Skipping")
 	}
 
-	if _, ok := os.LookupEnv("MEMCACHED"); ok {
-		if memcache, err := NewMemcache("localhost:11211"); err != nil {
-			t.Logf("cannot make memcache: %v", err)
-		} else {
-			cases = append(cases, memcache)
-		}
-	} else {
-		t.Log("$MEMCACHED not set. Skipping")
-	}
-
-	if _, ok := os.LookupEnv("MEMCACHEDCLUSTER"); ok {
-		if memcacheCluster, err := NewMemcacheCluster("localhost:11211"); err != nil {
-			t.Logf("cannot make memcacheCluster: %v", err)
-		} else {
-			cases = append(cases, memcacheCluster)
-		}
-	} else {
-		t.Log("$MEMCACHEDCLUSTER not set. Skipping")
-	}
-
 	if _, ok := os.LookupEnv("MINIO"); ok {
 		if minio, err := minio.NewMinio("localhost:9000", "accesskey", "secretkey"); err != nil {
 			t.Logf("cannot make minio: %v", err)
@@ -281,14 +261,6 @@ func TestToFromString(t *testing.T) {
 			key: "leveldb",
 			t:   LEVELDB,
 		},
-		{
-			key: "memcache",
-			t:   MEMCACHE,
-		},
-		{
-			key: "memcachecluster",
-			t:   MEMCACHECLUSTER,
-		},
 		{
 			key: "mongo",
 			t:   MONGO,
diff --git a/go.mod b/go.mod
index b71097d..9439887 100644
--- a/go.mod
+++ b/go.mod
@@ -4,9 +4,6 @@ go 1.16
 
 require (
 	github.com/boltdb/bolt v1.3.1
-	github.com/bradfitz/gomemcache v0.0.0-20190913173617-a41fca850d0b
-	github.com/buraksezer/consistent v0.9.0
-	github.com/cespare/xxhash v1.1.0
 	github.com/gomodule/redigo v1.8.5
 	github.com/google/uuid v1.3.0
 	github.com/minio/minio-go/v6 v6.0.57
@@ -14,7 +11,8 @@ require (
 	github.com/patrickmn/go-cache v2.1.0+incompatible
 	github.com/syndtr/goleveldb v1.0.0
 	go.mongodb.org/mongo-driver v1.7.2
-	gopkg.in/yaml.v2 v2.2.8 // indirect
+	golang.org/x/sys v0.0.0-20220503163025-988cb79eb6c6 // indirect
+	gopkg.in/yaml.v2 v2.2.8
 	local/logb v0.0.0-00010101000000-000000000000
 )
 
diff --git a/go.sum b/go.sum
index a37d178..4f11dae 100644
--- a/go.sum
+++ b/go.sum
@@ -5,8 +5,6 @@ github.com/Azure/azure-pipeline-go v0.1.8/go.mod h1:XA1kFWRVhSK+KNFiOhfv83Fv8L9a
 github.com/Azure/azure-storage-blob-go v0.0.0-20181023070848-cf01652132cc/go.mod h1:oGfmITT1V6x//CswqY2gtAHND+xIP64/qL7a5QJix0Y=
 github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78/go.mod h1:LmzpDX56iTiv29bbRTIsUNlaFfuhWRQBWjQdVyAevI8=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/OneOfOne/xxhash v1.2.2 h1:KMrpdQIwFcEqXDklaen+P1axHaj9BSKzvpUUfnHldSE=
-github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
 github.com/Unknwon/goconfig v0.0.0-20181105214110-56bd8ab18619 h1:6X8iB881g299aNEv6KXrcjL31iLOH7yA6NXoQX+MbDg=
 github.com/Unknwon/goconfig v0.0.0-20181105214110-56bd8ab18619/go.mod h1:wngxua9XCNjvHjDiTiV26DaKDT+0c63QR6H5hjVUUxw=
 github.com/a8m/tree v0.0.0-20180321023834-3cf936ce15d6/go.mod h1:FSdwKX97koS5efgm8WevNf7XS3PqtyFkKDDXrz778cg=
@@ -18,12 +16,6 @@ github.com/aws/aws-sdk-go v1.15.81/go.mod h1:E3/ieXAlvM0XWO57iftYVDLLvQ824smPP3A
 github.com/billziss-gh/cgofuse v1.1.0/go.mod h1:LJjoaUojlVjgo5GQoEJTcJNqZJeRU0nCR84CyxKt2YM=
 github.com/boltdb/bolt v1.3.1 h1:JQmyP4ZBrce+ZQu0dY660FMfatumYDLun9hBCUVIkF4=
 github.com/boltdb/bolt v1.3.1/go.mod h1:clJnj/oiGkjum5o1McbSZDSLxVThjynRyGBgiAx27Ps=
-github.com/bradfitz/gomemcache v0.0.0-20190913173617-a41fca850d0b h1:L/QXpzIa3pOvUGt1D1lA5KjYhPBAN/3iWdP7xeFS9F0=
-github.com/bradfitz/gomemcache v0.0.0-20190913173617-a41fca850d0b/go.mod h1:H0wQNHz2YrLsuXOZozoeDmnHXkNCRmMW0gwFWDfEZDA=
-github.com/buraksezer/consistent v0.9.0 h1:Zfs6bX62wbP3QlbPGKUhqDw7SmNkOzY5bHZIYXYpR5g=
-github.com/buraksezer/consistent v0.9.0/go.mod h1:6BrVajWq7wbKZlTOUPs/XVfR8c0maujuPowduSpZqmw=
-github.com/cespare/xxhash v1.1.0 h1:a6HrQnmkObjyL+Gs60czilIUGqrzKutQD6XZog3p+ko=
-github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
 github.com/coreos/bbolt v0.0.0-20180318001526-af9db2027c98/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
 github.com/cpuguy83/go-md2man v1.0.8/go.mod h1:N6JayAiVKtlHSnuTCeuLSQVs75hb8q+dYQLjr7cDsKY=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@@ -100,8 +92,10 @@ github.com/klauspost/cpuid v1.2.3/go.mod h1:Pj4uuM528wm8OyEC2QMXAi2YiTZ96dNQPGgo
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/konsorten/go-windows-terminal-sequences v1.0.2/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/kr/fs v0.1.0/go.mod h1:FFnZGqtBN9Gxj7eW1uZ42v5BccTP0vu6NEaFoC2HwRg=
+github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/markbates/oncer v0.0.0-20181203154359-bf2de49a0be2/go.mod h1:Ld9puTsIW75CHf65OeIOkyKbteujpZVXDpWK6YGZbxE=
 github.com/markbates/safe v1.0.1/go.mod h1:nAqgmRi7cY2nqMc92/bSEeQA+R4OheNU2T1kNSCBdG0=
@@ -162,8 +156,6 @@ github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d/go.mod h1
 github.com/smartystreets/goconvey v0.0.0-20181108003508-044398e4856c/go.mod h1:XDJAKZRPZ1CvBcN2aX5YOUTYGHki24fSF0Iv48Ibg0s=
 github.com/smartystreets/goconvey v0.0.0-20190330032615-68dc04aab96a h1:pa8hGb/2YqsZKovtsgrwcDH1RZhVbTKCjLp47XpqCDs=
 github.com/smartystreets/goconvey v0.0.0-20190330032615-68dc04aab96a/go.mod h1:syvi0/a8iFYH4r/RixwvyeAJjdLS9QV7WQ/tjFTllLA=
-github.com/spaolacci/murmur3 v0.0.0-20180118202830-f09979ecbc72 h1:qLC7fQah7D6K1B0ujays3HV9gkFtllcxhzImRR7ArPQ=
-github.com/spaolacci/murmur3 v0.0.0-20180118202830-f09979ecbc72/go.mod h1:JwIasOWyU6f++ZhiEuf87xNszmSA2myDM2Kzu9HwQUA=
 github.com/spf13/cobra v0.0.3/go.mod h1:1l0Ry5zgKvJasoi3XT1TypsSe7PqH0Sj9dhYf7v3XqQ=
 github.com/spf13/pflag v1.0.3 h1:zPAT6CGy6wXeQ7NtTnaTerfKOsV6V6F8agHXFiazDkg=
 github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
@@ -224,6 +216,8 @@ golang.org/x/sys v0.0.0-20190419153524-e8e3143a4f4a/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190531175056-4c3a928424d2 h1:T5DasATyLQfmbTpfEXx/IOL9vfjzW6up+ZDkmHvIf2s=
 golang.org/x/sys v0.0.0-20190531175056-4c3a928424d2/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20220503163025-988cb79eb6c6 h1:nonptSpoQ4vQjyraW20DXPAglgQfVnM9ZC6MmNLMR60=
+golang.org/x/sys v0.0.0-20220503163025-988cb79eb6c6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.5 h1:i6eZZ+zk0SOf0xgBpEpPD18qWcJda6q1sxt3S0kzyUQ=
 golang.org/x/text v0.3.5/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
@@ -243,6 +237,7 @@ google.golang.org/appengine v1.3.0 h1:FBSsiFRMz3LBeXIomRnVzrQwSDj4ibvcRexLG0LZGQ
 google.golang.org/appengine v1.3.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
diff --git a/memcache.go b/memcache.go
deleted file mode 100755
index bed1653..0000000
--- a/memcache.go
+++ /dev/null
@@ -1,78 +0,0 @@
-package storage
-
-import (
-	"errors"
-	"local/storage/resolve"
-	"net"
-	"path"
-
-	"github.com/bradfitz/gomemcache/memcache"
-)
-
-type Memcache struct {
-	db *memcache.Client
-}
-
-type netAddr struct {
-	network string
-	addr    string
-}
-
-func (a *netAddr) Network() string {
-	return a.network
-}
-
-func (a *netAddr) String() string {
-	return a.addr
-}
-
-func NewMemcache(addr string, addrs ...string) (*Memcache, error) {
-	for i := len(addrs) - 1; i >= 0; i-- {
-		if len(addrs[i]) == 0 {
-			addrs = append(addrs[:i], addrs[i+1:]...)
-		}
-	}
-	ss := &memcache.ServerList{}
-	if err := ss.SetServers(append([]string{addr}, addrs...)...); err != nil {
-		return nil, err
-	}
-	if err := ss.Each(func(addr net.Addr) error {
-		conn, err := net.Dial("tcp", addr.String())
-		if err != nil {
-			return err
-		}
-		return conn.Close()
-	}); err != nil {
-		return nil, err
-	}
-	db := memcache.NewFromSelector(ss)
-	return &Memcache{db: db}, nil
-}
-
-func (mc *Memcache) List(ns []string, limits ...string) ([]string, error) {
-	return nil, errors.New("not impl")
-}
-
-func (mc *Memcache) Get(key string, ns ...string) ([]byte, error) {
-	namespace := resolve.Namespace(ns)
-	v, err := mc.db.Get(path.Join(namespace, key))
-	if err != nil {
-		return nil, err
-	}
-	if v == nil {
-		return nil, ErrNotFound
-	}
-	return v.Value, err
-}
-
-func (mc *Memcache) Set(key string, value []byte, ns ...string) error {
-	namespace := resolve.Namespace(ns)
-	return mc.db.Set(&memcache.Item{
-		Key:   path.Join(namespace, key),
-		Value: value,
-	})
-}
-
-func (mc *Memcache) Close() error {
-	return mc.db.FlushAll()
-}
diff --git a/memcachecluster.go b/memcachecluster.go
deleted file mode 100755
index bf775dc..0000000
--- a/memcachecluster.go
+++ /dev/null
@@ -1,94 +0,0 @@
-package storage
-
-import (
-	"errors"
-	"local/storage/resolve"
-	"net"
-	"path"
-
-	"github.com/bradfitz/gomemcache/memcache"
-	"github.com/buraksezer/consistent"
-	"github.com/cespare/xxhash"
-)
-
-type MemcacheCluster struct {
-	db *memcache.Client
-}
-
-type serverSelector struct {
-	hash *consistent.Consistent
-}
-
-func (ss *serverSelector) PickServer(key string) (net.Addr, error) {
-	return &netAddr{
-		network: "tcp",
-		addr:    ss.hash.LocateKey([]byte(key)).String(),
-	}, nil
-}
-
-func (ss *serverSelector) Each(each func(net.Addr) error) error {
-	for _, member := range ss.hash.GetMembers() {
-		if err := each(&netAddr{
-			network: "tcp",
-			addr:    member.String(),
-		}); err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
-type hasher struct{}
-
-func (h hasher) Sum64(data []byte) uint64 {
-	return xxhash.Sum64(data)
-}
-
-func NewMemcacheCluster(addr string, addrs ...string) (*MemcacheCluster, error) {
-	cfg := consistent.Config{
-		PartitionCount:    71,
-		ReplicationFactor: 20,
-		Load:              1.25,
-		Hasher:            hasher{},
-	}
-	hash := consistent.New(nil, cfg)
-	for _, addr := range append(addrs, addr) {
-		hash.Add(&netAddr{addr: addr})
-	}
-	ss := &serverSelector{
-		hash: hash,
-	}
-	if err := ss.Each(func(addr net.Addr) error {
-		conn, err := net.Dial("tcp", addr.String())
-		if err != nil {
-			return err
-		}
-		return conn.Close()
-	}); err != nil {
-		return nil, err
-	}
-	db := memcache.NewFromSelector(ss)
-	return &MemcacheCluster{db: db}, nil
-}
-
-func (mc *MemcacheCluster) List(ns []string, limits ...string) ([]string, error) {
-	return nil, errors.New("not impl")
-}
-
-func (mc *MemcacheCluster) Get(key string, ns ...string) ([]byte, error) {
-	namespace := resolve.Namespace(ns)
-	v, err := mc.db.Get(path.Join(namespace, key))
-	return v.Value, err
-}
-
-func (mc *MemcacheCluster) Set(key string, value []byte, ns ...string) error {
-	namespace := resolve.Namespace(ns)
-	return mc.db.Set(&memcache.Item{
-		Key:   path.Join(namespace, key),
-		Value: value,
-	})
-}
-
-func (mc *MemcacheCluster) Close() error {
-	return mc.db.FlushAll()
-}
diff --git a/type.go b/type.go
index ef4975c..d6e7f64 100755
--- a/type.go
+++ b/type.go
@@ -7,21 +7,19 @@ import (
 type Type int
 
 const (
-	MAP             = Type(iota)
-	REDIS           = Type(iota)
-	DYNOMITE        = Type(iota)
-	BOLT            = Type(iota)
-	FILES           = Type(iota)
-	COCKROACH       = Type(iota)
-	CACHE           = Type(iota)
-	LEVELDB         = Type(iota)
-	MEMCACHE        = Type(iota)
-	MEMCACHECLUSTER = Type(iota)
-	MONGO           = Type(iota)
-	MINIO           = Type(iota)
-	RCLONE          = Type(iota)
-	MAPSTREAM       = Type(iota)
-	YAML            = Type(iota)
+	MAP       = Type(iota)
+	REDIS     = Type(iota)
+	DYNOMITE  = Type(iota)
+	BOLT      = Type(iota)
+	FILES     = Type(iota)
+	COCKROACH = Type(iota)
+	CACHE     = Type(iota)
+	LEVELDB   = Type(iota)
+	MONGO     = Type(iota)
+	MINIO     = Type(iota)
+	RCLONE    = Type(iota)
+	MAPSTREAM = Type(iota)
+	YAML      = Type(iota)
 )
 
 func (t Type) String() string {
@@ -50,10 +48,6 @@ func (t Type) String() string {
 		return "cache"
 	case LEVELDB:
 		return "leveldb"
-	case MEMCACHE:
-		return "memcache"
-	case MEMCACHECLUSTER:
-		return "memcachecluster"
 	case MONGO:
 		return "mongo"
 	}