diff --git a/src/redis-shake/common/command.go b/src/redis-shake/common/command.go
index 4f71df9..bfc619d 100644
--- a/src/redis-shake/common/command.go
+++ b/src/redis-shake/common/command.go
@@ -4,8 +4,21 @@ import (
 	"bytes"
 	"fmt"
 	"strconv"
+	"redis-shake/configure"
 )
 
+type ClusterNodeInfo struct {
+	Id          string
+	Address     string
+	Flags       string
+	Master      string
+	PingSent    string
+	PongRecv    string
+	ConfigEpoch string
+	LinkStat    string
+	Slot        string
+}
+
 func ParseKeyspace(content []byte) (map[int32]int64, error) {
 	if bytes.HasPrefix(content, []byte("# Keyspace")) == false {
 		return nil, fmt.Errorf("invalid info Keyspace: %s", string(content))
@@ -34,4 +47,59 @@ func ParseKeyspace(content []byte) (map[int32]int64, error) {
 		} // end true
 	} // end for
 	return reply, nil
+}
+
+/*
+ * 10.1.1.1:21331> cluster nodes
+ * d49a4c7b516b8da222d46a0a589b77f381285977 10.1.1.1:21333@31333 master - 0 1557996786000 3 connected 10923-16383
+ * f23ba7be501b2dcd4d6eeabd2d25551513e5c186 10.1.1.1:21336@31336 slave d49a4c7b516b8da222d46a0a589b77f381285977 0 1557996785000 6 connected
+ * 75fffcd521738606a919607a7ddd52bcd6d65aa8 10.1.1.1:21331@31331 myself,master - 0 1557996784000 1 connected 0-5460
+ * da3dd51bb9cb5803d99942e0f875bc5f36dc3d10 10.1.1.1:21332@31332 master - 0 1557996786260 2 connected 5461-10922
+ * eff4e654d3cc361a8ec63640812e394a8deac3d6 10.1.1.1:21335@31335 slave da3dd51bb9cb5803d99942e0f875bc5f36dc3d10 0 1557996787261 5 connected
+ * 486e081f8d47968df6a7e43ef9d3ba93b77d03b2 10.1.1.1:21334@31334 slave 75fffcd521738606a919607a7ddd52bcd6d65aa8 0 1557996785258 4 connected
+ */
+func ParseClusterNode(content []byte) []*ClusterNodeInfo {
+	lines := bytes.Split(content, []byte("\r\n"))
+	ret := make([]*ClusterNodeInfo, 0, len(lines))
+	for _, line := range lines {
+		items := bytes.Split(line, []byte(" "))
+
+		address := bytes.Split(items[1], []byte{'@'})
+		flag := bytes.Split(items[2], []byte{','})
+		var role string
+		if len(flag) > 1 {
+			role = string(flag[1])
+		} else {
+			role = string(flag[0])
+		}
+		var slot string
+		if len(items) > 7 {
+			slot = string(items[7])
+		}
+		ret = append(ret, &ClusterNodeInfo{
+			Id:          string(items[0]),
+			Address:     string(address[0]),
+			Flags:       role,
+			Master:      string(items[3]),
+			PingSent:    string(items[4]),
+			PongRecv:    string(items[5]),
+			ConfigEpoch: string(items[6]),
+			LinkStat:    string(items[7]),
+			Slot:        slot,
+		})
+	}
+	return ret
+}
+
+// needMaster: true(master), false(slave)
+func ClusterNodeChoose(input []*ClusterNodeInfo, needMaster bool) []*ClusterNodeInfo {
+	ret := make([]*ClusterNodeInfo, 0, len(input) / 2)
+	for _, ele := range input {
+		if ele.Flags == conf.StandAloneRoleMaster && needMaster {
+			ret = append(ret, ele)
+		} else if ele.Flags == conf.StandAloneRoleSlave && !needMaster {
+			ret = append(ret, ele)
+		}
+	}
+	return ret
 }
\ No newline at end of file
diff --git a/src/redis-shake/sync.go b/src/redis-shake/sync.go
index 603c2ac..ebbb7dc 100644
--- a/src/redis-shake/sync.go
+++ b/src/redis-shake/sync.go
@@ -698,7 +698,7 @@ func (ds *dbSyncer) syncCommand(reader *bufio.Reader, target, auth_type, passwd
 		fmt.Fprintf(&b, "dbSyncer[%v] sync: ", ds.id)
 		fmt.Fprintf(&b, " +forward=%-6d", nstat.forward-lstat.forward)
 		fmt.Fprintf(&b, " +nbypass=%-6d", nstat.nbypass-lstat.nbypass)
-		fmt.Fprintf(&b, " +nbytes=%d", nstat.wbytes-lstat.wbytes)
+		fmt.Fprintf(&b, " +nbytes=%d", nstat.wbytes-lstat.wbytes) // todo
 		log.Info(b.String())
 		lstat = nstat
 	}
diff --git a/src/vendor/vendor.json b/src/vendor/vendor.json
index e4b7d1f..6f13072 100644
--- a/src/vendor/vendor.json
+++ b/src/vendor/vendor.json
@@ -8,6 +8,12 @@
 			"revision": "76bd05e8e22f9f8f5e1dd6d3a85b7951da7cce57",
 			"revisionTime": "2017-12-04T08:54:13Z"
 		},
+		{
+			"checksumSHA1": "A7qoimg0p6dsVIQNpjX0uW2UjoM=",
+			"path": "github.com/chasex/redis-go-cluster",
+			"revision": "222d81891f1d3fa7cf8b5655020352c3e5b4ec0f",
+			"revisionTime": "2016-12-07T02:39:22Z"
+		},
 		{
 			"checksumSHA1": "1/Kf0ihi6RtfNt0JjAtZLKvfqJY=",
 			"path": "github.com/cupcake/rdb",