diff --git a/src/redis-shake/main/main.go b/src/redis-shake/main/main.go
index 9ab1c3f..58346d5 100644
--- a/src/redis-shake/main/main.go
+++ b/src/redis-shake/main/main.go
@@ -390,14 +390,13 @@ func sanitizeOptions(tp string) error {
 		}
 
 		if conf.Options.ScanSpecialCloud != "" && conf.Options.ScanKeyFile != "" {
-			return fmt.Errorf("scan.special_cloud[%v] and scan.key_file[%v] cann't be given at the same time",
+			return fmt.Errorf("scan.special_cloud[%v] and scan.key_file[%v] can't all be given at the same time",
 				conf.Options.ScanSpecialCloud, conf.Options.ScanKeyFile)
 		}
 
-		if (conf.Options.ScanSpecialCloud != "" || conf.Options.ScanKeyFile != "") && len(conf.Options.SourceAddressList) > 1 {
-			return fmt.Errorf("source address should <= 1 when scan.special_cloud[%v] or scan.key_file[%v] given",
-				conf.Options.ScanSpecialCloud, conf.Options.ScanKeyFile)
-		}
+		//if len(conf.Options.SourceAddressList) == 1 {
+		//	return fmt.Errorf("source address length should == 1 when type is 'rump'")
+		//}
 	}
 
 	return nil
diff --git a/src/redis-shake/rump.go b/src/redis-shake/rump.go
index 96e8603..a7032a7 100644
--- a/src/redis-shake/rump.go
+++ b/src/redis-shake/rump.go
@@ -14,13 +14,136 @@ import (
 )
 
 type CmdRump struct {
-	sourceConn []redis.Conn
-	targetConn redis.Conn
+}
+
+func (cr *CmdRump) GetDetailedInfo() interface{} {
+	return nil
+}
+
+func (cr *CmdRump) Main() {
+	var wg sync.WaitGroup
+	wg.Add(len(conf.Options.SourceAddressList))
+	// build dbRumper
+	for i, address := range conf.Options.SourceAddressList {
+		dr := &dbRumper{
+			id:      i,
+			address: address,
+		}
+		log.Infof("start dbRumper[%v]", i)
+		go func() {
+			defer wg.Done()
+			dr.run()
+		}()
+	}
+	wg.Wait()
+
+	log.Info("all rumpers finish!")
+}
+
+/*------------------------------------------------------*/
+// one rump(1 db or 1 proxy) link corresponding to one dbRumper
+type dbRumper struct {
+	id      int // id
+	address string
+
+	client       redis.Conn // source client
+	tencentNodes []string   // for tencent cluster only
+}
+
+func (dr *dbRumper) run() {
+	// single connection
+	dr.client = utils.OpenRedisConn([]string{dr.address}, conf.Options.SourceAuthType,
+			conf.Options.SourcePasswordRaw, false, conf.Options.SourceTLSEnable)
+
+	// some clouds may have several db under proxy
+	count, err := dr.getNode()
+	if err != nil {
+		log.Panicf("dbRumper[%v] get node failed[%v]", dr.id, err)
+	}
+
+	log.Infof("dbRumper[%v] get node count: %v", dr.id, count)
+
+	var wg sync.WaitGroup
+	wg.Add(count)
+	for i := 0; i < count; i++ {
+		var target []string
+		if conf.Options.TargetType == conf.RedisTypeCluster {
+			target = conf.Options.TargetAddressList
+		} else {
+			// round-robin pick
+			pick := utils.PickTargetRoundRobin(len(conf.Options.TargetAddressList))
+			target = []string{conf.Options.TargetAddressList[pick]}
+		}
+
+		var tencentNodeId string
+		if len(dr.tencentNodes) > 0 {
+			tencentNodeId = dr.tencentNodes[i]
+		}
+
+		executor := &dbRumperExecutor{
+			rumperId:   dr.id,
+			executorId: i,
+			sourceClient: utils.OpenRedisConn([]string{dr.address}, conf.Options.SourceAuthType,
+				conf.Options.SourcePasswordRaw, false, conf.Options.SourceTLSEnable),
+			targetClient: utils.OpenRedisConn(target, conf.Options.TargetAuthType,
+				conf.Options.TargetPasswordRaw, conf.Options.TargetType == conf.RedisTypeCluster,
+				conf.Options.TargetTLSEnable),
+			tencentNodeId: tencentNodeId,
+		}
+
+		go func() {
+			defer wg.Done()
+			executor.exec()
+		}()
+	}
+
+	wg.Wait()
+
+	log.Infof("dbRumper[%v] finished!", dr.id)
+}
+
+func (dr *dbRumper) getNode() (int, error) {
+	switch conf.Options.ScanSpecialCloud {
+	case utils.AliyunCluster:
+		info, err := redis.Bytes(dr.client.Do("info", "Cluster"))
+		if err != nil {
+			return -1, err
+		}
+
+		result := utils.ParseInfo(info)
+		if count, err := strconv.ParseInt(result["nodecount"], 10, 0); err != nil {
+			return -1, err
+		} else if count <= 0 {
+			return -1, fmt.Errorf("source node count[%v] illegal", count)
+		} else {
+			return int(count), nil
+		}
+	case utils.TencentCluster:
+		var err error
+		dr.tencentNodes, err = utils.GetAllClusterNode(dr.client, conf.StandAloneRoleMaster, "id")
+		if err != nil {
+			return -1, err
+		}
+
+		return len(dr.tencentNodes), nil
+	default:
+		return 1, nil
+	}
+}
+
+/*------------------------------------------------------*/
+// one executor(1 db only) link corresponding to one dbRumperExecutor
+type dbRumperExecutor struct {
+	rumperId      int // father id
+	executorId    int // current id, also == aliyun cluster node id
+	sourceClient  redis.Conn
+	targetClient  redis.Conn
+	tencentNodeId string // tencent cluster node id
 
 	keyChan    chan *KeyNode // keyChan is used to communicated between routine1 and routine2
 	resultChan chan *KeyNode // resultChan is used to communicated between routine2 and routine3
 
-	scanners  []scanner.Scanner // one scanner match one db/proxy
+	scanner   scanner.Scanner // one scanner match one db/proxy
 	fetcherWg sync.WaitGroup
 }
 
@@ -30,137 +153,103 @@ type KeyNode struct {
 	pttl  int64
 }
 
-func (cr *CmdRump) GetDetailedInfo() interface{} {
-	return nil
-}
-
-func (cr *CmdRump) Main() {
-	// build connection
-
-	cr.sourceConn = make([]redis.Conn, len(conf.Options.SourceAddressList))
-	for i, address := range conf.Options.SourceAddressList {
-		cr.sourceConn[i] = utils.OpenRedisConn([]string{address}, conf.Options.SourceAuthType,
-		conf.Options.SourcePasswordRaw, false, conf.Options.SourceTLSEnable)
+func (dre *dbRumperExecutor) exec() {
+	// create scanner
+	dre.scanner = scanner.NewScanner(dre.sourceClient, dre.tencentNodeId, dre.executorId)
+	if dre.scanner == nil {
+		log.Panicf("dbRumper[%v] executor[%v] create scanner failed", dre.rumperId, dre.executorId)
+		return
 	}
-	// TODO, current only support write data into 1 db or proxy
-	cr.targetConn = utils.OpenRedisConn(conf.Options.TargetAddressList, conf.Options.TargetAuthType,
-		conf.Options.TargetPasswordRaw, false, conf.Options.SourceTLSEnable)
 
 	// init two channels
-	chanSize := int(conf.Options.ScanKeyNumber) * len(conf.Options.SourceAddressList)
-	cr.keyChan = make(chan *KeyNode, chanSize)
-	cr.resultChan = make(chan *KeyNode, chanSize)
-
-	cr.scanners = scanner.NewScanner(cr.sourceConn)
-	if cr.scanners == nil || len(cr.scanners) == 0 {
-		log.Panic("create scanner failed")
-		return
-	}
+	chanSize := int(conf.Options.ScanKeyNumber * 2)
+	dre.keyChan = make(chan *KeyNode, chanSize)
+	dre.resultChan = make(chan *KeyNode, chanSize)
 
 	/*
 	 * we start 4 routines to run:
 	 * 1. fetch keys from the source redis
-	 * 2. wait fetcher all exit
-	 * 3. write keys into the target redis
-	 * 4. read result from the target redis
+	 * 2. write keys into the target redis
+	 * 3. read result from the target redis
 	 */
 	// routine1
-	cr.fetcherWg.Add(len(cr.scanners))
-	for i := range cr.scanners {
-		go cr.fetcher(i)
-	}
-
-	// routine2
-	go func() {
-		cr.fetcherWg.Wait()
-		close(cr.keyChan)
-	}()
+	go dre.fetcher()
 
 	// routine3
-	go cr.writer()
+	go dre.writer()
 
 	// routine4
-	cr.receiver()
-}
-
-/*------------------------------------------------------*/
-// one rump link corresponding to one dbRumper
-type dbRumper struct {
+	dre.receiver()
 
+	log.Infof("dbRumper[%v] executor[%v] finish!", dre.rumperId, dre.executorId)
 }
 
-func (cr *CmdRump) fetcher(idx int) {
-	length, err := cr.scanners[idx].NodeCount()
-	if err != nil || length <= 0 {
-		log.Panicf("fetch db node failed: length[%v], error[%v]", length, err)
-	}
+func (dre *dbRumperExecutor) fetcher() {
+	log.Infof("dbRumper[%v] executor[%v] start fetcher with special-cloud[%v]", dre.rumperId, dre.executorId,
+		conf.Options.ScanSpecialCloud)
 
-	log.Infof("start fetcher with special-cloud[%v], nodes[%v]", conf.Options.ScanSpecialCloud, length)
+	// fetch db number from 'info keyspace'
+	dbNumber, err := dre.getSourceDbList()
+	if err != nil {
+		log.Panic(err)
+	}
 
-	// iterate all source nodes
-	for i := 0; i < length; i++ {
-		// fetch db number from 'info Keyspace'
-		dbNumber, err := cr.getSourceDbList(idx)
-		if err != nil {
+	log.Infof("dbRumper[%v] executor[%v] fetch db list: %v", dre.rumperId, dre.executorId, dbNumber)
+	// iterate all db
+	for _, db := range dbNumber {
+		log.Infof("dbRumper[%v] executor[%v] fetch logical db: %v", dre.rumperId, dre.executorId, db)
+		if err := dre.doFetch(int(db)); err != nil {
 			log.Panic(err)
 		}
-
-		log.Infof("fetch node[%v] with db list: %v", i, dbNumber)
-		// iterate all db
-		for _, db := range dbNumber {
-			log.Infof("fetch node[%v] db[%v]", i, db)
-			if err := cr.doFetch(int(db), i); err != nil {
-				log.Panic(err)
-			}
-		}
 	}
 
-	cr.fetcherWg.Done()
+	close(dre.keyChan)
 }
 
-func (cr *CmdRump) writer() {
+func (dre *dbRumperExecutor) writer() {
 	var count uint32
-	for ele := range cr.keyChan {
+	for ele := range dre.keyChan {
 		if ele.pttl == -1 { // not set ttl
 			ele.pttl = 0
 		}
 		if ele.pttl == -2 {
-			log.Debugf("skip key %s for expired", ele.key)
+			log.Debugf("dbRumper[%v] executor[%v] skip key %s for expired", dre.rumperId, dre.executorId, ele.key)
 			continue
 		}
 
-		log.Debugf("restore %s", ele.key)
+		// TODO, big key split
+		log.Debugf("dbRumper[%v] executor[%v] restore %s", dre.rumperId, dre.executorId, ele.key)
 		if conf.Options.Rewrite {
-			cr.targetConn.Send("RESTORE", ele.key, ele.pttl, ele.value, "REPLACE")
+			dre.targetClient.Send("RESTORE", ele.key, ele.pttl, ele.value, "REPLACE")
 		} else {
-			cr.targetConn.Send("RESTORE", ele.key, ele.pttl, ele.value)
+			dre.targetClient.Send("RESTORE", ele.key, ele.pttl, ele.value)
 		}
 
-		cr.resultChan <- ele
+		dre.resultChan <- ele
 		count++
 		if count == conf.Options.ScanKeyNumber {
 			// batch
-			log.Debugf("send keys %d\n", count)
-			cr.targetConn.Flush()
+			log.Debugf("dbRumper[%v] executor[%v] send keys %d", dre.rumperId, dre.executorId, count)
+			dre.targetClient.Flush()
 			count = 0
 		}
 	}
-	cr.targetConn.Flush()
-	close(cr.resultChan)
+	dre.targetClient.Flush()
+	close(dre.resultChan)
 }
 
-func (cr *CmdRump) receiver() {
-	for ele := range cr.resultChan {
-		if _, err := cr.targetConn.Receive(); err != nil && err != redis.ErrNil {
-			log.Panicf("restore key[%v] with pttl[%v] error[%v]", ele.key, strconv.FormatInt(ele.pttl, 10),
-				err)
+func (dre *dbRumperExecutor) receiver() {
+	for ele := range dre.resultChan {
+		if _, err := dre.targetClient.Receive(); err != nil && err != redis.ErrNil {
+			log.Panicf("dbRumper[%v] executor[%v] restore key[%v] with pttl[%v] error[%v]", dre.rumperId,
+				dre.executorId, ele.key, strconv.FormatInt(ele.pttl, 10), err)
 		}
 	}
 }
 
-func (cr *CmdRump) getSourceDbList(id int) ([]int32, error) {
-	conn := cr.sourceConn[id]
-	if ret, err := conn.Do("info", "Keyspace"); err != nil {
+func (dre *dbRumperExecutor) getSourceDbList() ([]int32, error) {
+	conn := dre.sourceClient
+	if ret, err := conn.Do("info", "keyspace"); err != nil {
 		return nil, err
 	} else if mp, err := utils.ParseKeyspace(ret.([]byte)); err != nil {
 		return nil, err
@@ -175,69 +264,63 @@ func (cr *CmdRump) getSourceDbList(id int) ([]int32, error) {
 	}
 }
 
-func (cr *CmdRump) doFetch(db, idx int) error {
+func (dre *dbRumperExecutor) doFetch(db int) error {
 	// send 'select' command to both source and target
-	log.Infof("send source select db")
-	// todo sourceConn[0]
-	if _, err := cr.sourceConn[0].Do("select", db); err != nil {
+	log.Infof("dbRumper[%v] executor[%v] send source select db", dre.rumperId, dre.executorId)
+	if _, err := dre.sourceClient.Do("select", db); err != nil {
 		return err
 	}
 
-	log.Infof("send target select db")
-	cr.targetConn.Flush()
-	if err := cr.targetConn.Send("select", db); err != nil {
+	// it's ok to send select directly because the message order can be guaranteed.
+	log.Infof("dbRumper[%v] executor[%v] send target select db", dre.rumperId, dre.executorId)
+	dre.targetClient.Flush()
+	if err := dre.targetClient.Send("select", db); err != nil {
 		return err
 	}
-	cr.targetConn.Flush()
+	dre.targetClient.Flush()
 
-	log.Infof("finish select db, start fetching node[%v] db[%v]", idx, db)
+	log.Infof("dbRumper[%v] executor[%v] start fetching node db[%v]", dre.rumperId, dre.executorId, db)
 
 	for {
-		// todo sourceConn[0]
-		keys, err := cr.scanners[0].ScanKey(idx)
+		keys, err := dre.scanner.ScanKey()
 		if err != nil {
 			return err
 		}
 
-		log.Info("scanned keys: ", len(keys))
+		log.Infof("dbRumper[%v] executor[%v] scanned keys number: %v", dre.rumperId, dre.executorId, len(keys))
 
 		if len(keys) != 0 {
 			// pipeline dump
 			for _, key := range keys {
-				log.Debug("scan key: ", key)
-				// todo sourceConn[0]
-				cr.sourceConn[0].Send("DUMP", key)
+				log.Debug("dbRumper[%v] executor[%v] scan key: %v", dre.rumperId, dre.executorId, key)
+				dre.sourceClient.Send("DUMP", key)
 			}
-			// todo sourceConn[0]
-			dumps, err := redis.Strings(cr.sourceConn[0].Do(""))
+			dumps, err := redis.Strings(dre.sourceClient.Do(""))
 			if err != nil && err != redis.ErrNil {
 				return fmt.Errorf("do dump with failed[%v]", err)
 			}
 
 			// pipeline ttl
 			for _, key := range keys {
-				// todo sourceConn[0]
-				cr.sourceConn[0].Send("PTTL", key)
+				dre.sourceClient.Send("PTTL", key)
 			}
-			// todo sourceConn[0]
-			pttls, err := redis.Int64s(cr.sourceConn[0].Do(""))
+			pttls, err := redis.Int64s(dre.sourceClient.Do(""))
 			if err != nil && err != redis.ErrNil {
 				return fmt.Errorf("do ttl with failed[%v]", err)
 			}
 
 			for i, k := range keys {
-				cr.keyChan <- &KeyNode{k, dumps[i], pttls[i]}
+				dre.keyChan <- &KeyNode{k, dumps[i], pttls[i]}
 			}
 		}
 
 		// Last iteration of scan.
-		// todo sourceConn[0]
-		if cr.scanners[0].EndNode() {
+		if dre.scanner.EndNode() {
 			break
 		}
 	}
 
-	log.Infof("finish fetching node[%v] db[%v]", idx, db)
+	log.Infof("dbRumper[%v] executor[%v] finish fetching db[%v]", dre.rumperId, dre.executorId, db)
 
 	return nil
 }
\ No newline at end of file
diff --git a/src/redis-shake/scanner/keyFileScanner.go b/src/redis-shake/scanner/keyFileScanner.go
index 2d50087..e6ad0ab 100644
--- a/src/redis-shake/scanner/keyFileScanner.go
+++ b/src/redis-shake/scanner/keyFileScanner.go
@@ -13,11 +13,7 @@ type KeyFileScanner struct {
 	cnt     int // mark the number of this scan. init: -1
 }
 
-func (kfs *KeyFileScanner) NodeCount() (int, error) {
-	return 1, nil
-}
-
-func (kfs *KeyFileScanner) ScanKey(node interface{}) ([]string, error) {
+func (kfs *KeyFileScanner) ScanKey() ([]string, error) {
 	keys := make([]string, 0, conf.Options.ScanKeyNumber)
 	for i := 0; i < int(conf.Options.ScanKeyNumber) && kfs.bufScan.Scan(); i++ {
 		keys = append(keys, kfs.bufScan.Text())
diff --git a/src/redis-shake/scanner/normalScanner.go b/src/redis-shake/scanner/normalScanner.go
index f35630e..9ebc720 100644
--- a/src/redis-shake/scanner/normalScanner.go
+++ b/src/redis-shake/scanner/normalScanner.go
@@ -13,11 +13,7 @@ type NormalScanner struct {
 	cursor int64
 }
 
-func (ns *NormalScanner) NodeCount() (int, error) {
-	return 1, nil
-}
-
-func (ns *NormalScanner) ScanKey(node interface{}) ([]string, error) {
+func (ns *NormalScanner) ScanKey() ([]string, error) {
 	var keys []string
 	values, err := redis.Values(ns.client.Do("SCAN", ns.cursor, "COUNT",
 		conf.Options.ScanKeyNumber))
diff --git a/src/redis-shake/scanner/scanner.go b/src/redis-shake/scanner/scanner.go
index c016346..48a5410 100644
--- a/src/redis-shake/scanner/scanner.go
+++ b/src/redis-shake/scanner/scanner.go
@@ -11,15 +11,8 @@ import (
 
 // scanner used to scan keys
 type Scanner interface {
-	/*
-	 * get db node info.
-	 * return:
-	 *     int: node number. Used in aliyun_cluster
-	 */
-	NodeCount() (int, error)
-
 	// return scanned keys
-	ScanKey(node interface{}) ([]string, error) // return the scanned keys
+	ScanKey() ([]string, error) // return the scanned keys
 
 	// end current node
 	EndNode() bool
@@ -27,35 +20,29 @@ type Scanner interface {
 	Close()
 }
 
-func NewScanner(client []redis.Conn) []Scanner {
+func NewScanner(client redis.Conn, tencentNodeId string, aliyunNodeId int) Scanner {
 	if conf.Options.ScanSpecialCloud != "" {
-		return []Scanner{
-			&SpecialCloudScanner{
-				client: client[0],
-				cursor: 0,
-			},
+		return &SpecialCloudScanner{
+			client:        client,
+			cursor:        0,
+			tencentNodeId: tencentNodeId,
+			aliyunNodeId:  aliyunNodeId,
 		}
 	} else if conf.Options.ScanKeyFile != "" {
 		if f, err := os.Open(conf.Options.ScanKeyFile); err != nil {
 			log.Errorf("open scan-key-file[%v] error[%v]", conf.Options.ScanKeyFile, err)
 			return nil
 		} else {
-			return []Scanner{
-				&KeyFileScanner{
-					f:       f,
-					bufScan: bufio.NewScanner(f),
-					cnt:     -1,
-				},
+			return &KeyFileScanner{
+				f:       f,
+				bufScan: bufio.NewScanner(f),
+				cnt:     -1,
 			}
 		}
 	} else {
-		ret := make([]Scanner, 0, len(client))
-		for _, c := range client {
-			ret = append(ret, &NormalScanner{
-				client: c,
-				cursor: 0,
-			})
+		return &NormalScanner{
+			client: client,
+			cursor: 0,
 		}
-		return ret
 	}
 }
diff --git a/src/redis-shake/scanner/specialCloudScanner.go b/src/redis-shake/scanner/specialCloudScanner.go
index bc33383..c1ded75 100644
--- a/src/redis-shake/scanner/specialCloudScanner.go
+++ b/src/redis-shake/scanner/specialCloudScanner.go
@@ -1,7 +1,6 @@
 package scanner
 
 import (
-	"strconv"
 	"fmt"
 	"redis-shake/common"
 	"redis-shake/configure"
@@ -13,39 +12,11 @@ type SpecialCloudScanner struct {
 	client redis.Conn
 	cursor int64
 
-	tencentNodes []string
+	tencentNodeId string
+	aliyunNodeId int
 }
 
-func (scs *SpecialCloudScanner) NodeCount() (int, error) {
-	switch conf.Options.ScanSpecialCloud {
-	case utils.AliyunCluster:
-		info, err := redis.Bytes(scs.client.Do("info", "Cluster"))
-		if err != nil {
-			return -1, err
-		}
-
-		result := utils.ParseInfo(info)
-		if count, err := strconv.ParseInt(result["nodecount"], 10, 0); err != nil {
-			return -1, err
-		} else if count <= 0 {
-			return -1, fmt.Errorf("source node count[%v] illegal", count)
-		} else {
-			return int(count), nil
-		}
-	case utils.TencentCluster:
-		var err error
-		scs.tencentNodes, err = utils.GetAllClusterNode(scs.client, conf.StandAloneRoleMaster, "id")
-		if err != nil {
-			return -1, err
-		}
-
-		return len(scs.tencentNodes), nil
-	default:
-		return -1, nil
-	}
-}
-
-func (scs *SpecialCloudScanner) ScanKey(node interface{}) ([]string, error) {
+func (scs *SpecialCloudScanner) ScanKey() ([]string, error) {
 	var (
 		values []interface{}
 		err    error
@@ -55,9 +26,9 @@ func (scs *SpecialCloudScanner) ScanKey(node interface{}) ([]string, error) {
 	switch conf.Options.ScanSpecialCloud {
 	case utils.TencentCluster:
 		values, err = redis.Values(scs.client.Do("SCAN", scs.cursor, "COUNT",
-			conf.Options.ScanKeyNumber, scs.tencentNodes[node.(int)]))
+			conf.Options.ScanKeyNumber, scs.tencentNodeId))
 	case utils.AliyunCluster:
-		values, err = redis.Values(scs.client.Do("ISCAN", node, scs.cursor, "COUNT",
+		values, err = redis.Values(scs.client.Do("ISCAN", scs.aliyunNodeId, scs.cursor, "COUNT",
 			conf.Options.ScanKeyNumber))
 	}
 	if err != nil && err != redis.ErrNil {