diff --git a/Makefile b/Makefile
index 8dd68fc7e7..2ef0a75942 100644
--- a/Makefile
+++ b/Makefile
@@ -113,6 +113,10 @@ indexservice: build-cpp
 	@echo "Building distributed indexservice ..."
 	@mkdir -p $(INSTALL_PATH) && go env -w CGO_ENABLED="1" && GO111MODULE=on $(GO) build -o $(INSTALL_PATH)/indexservice $(PWD)/cmd/indexservice/main.go 1>/dev/null
 
+singlenode: build-cpp
+	@echo "Building singlenode ..."
+	@mkdir -p $(INSTALL_PATH) && go env -w CGO_ENABLED="1" && GO111MODULE=on $(GO) build -o $(INSTALL_PATH)/singlenode $(PWD)/cmd/singlenode/main.go 1>/dev/null
+
 
 # Builds various components locally.
 build-go: build-cpp
diff --git a/internal/util/rocksmq/rocksmq.go b/internal/util/rocksmq/rocksmq.go
index 2e29edf0e1..4854d14a73 100644
--- a/internal/util/rocksmq/rocksmq.go
+++ b/internal/util/rocksmq/rocksmq.go
@@ -11,6 +11,7 @@ import (
 
 	"github.com/tecbot/gorocksdb"
 	"github.com/zilliztech/milvus-distributed/internal/kv"
+	"github.com/zilliztech/milvus-distributed/internal/log"
 	"github.com/zilliztech/milvus-distributed/internal/util/typeutil"
 
 	memkv "github.com/zilliztech/milvus-distributed/internal/kv/mem"
@@ -125,16 +126,19 @@ func (rmq *RocksMQ) CreateChannel(channelName string) error {
 
 	// Check if channel exist
 	if rmq.checkKeyExist(beginKey) || rmq.checkKeyExist(endKey) {
+		log.Debug("RocksMQ: " + beginKey + " or " + endKey + " existed.")
 		return nil
 	}
 
 	err := rmq.kv.Save(beginKey, "0")
 	if err != nil {
+		log.Debug("RocksMQ: save " + beginKey + " failed.")
 		return err
 	}
 
 	err = rmq.kv.Save(endKey, "0")
 	if err != nil {
+		log.Debug("RocksMQ: save " + endKey + " failed.")
 		return err
 	}
 
@@ -153,11 +157,13 @@ func (rmq *RocksMQ) DestroyChannel(channelName string) error {
 
 	err := rmq.kv.Remove(beginKey)
 	if err != nil {
+		log.Debug("RocksMQ: remove " + beginKey + " failed.")
 		return err
 	}
 
 	err = rmq.kv.Remove(endKey)
 	if err != nil {
+		log.Debug("RocksMQ: remove " + endKey + " failed.")
 		return err
 	}
 
@@ -167,10 +173,12 @@ func (rmq *RocksMQ) DestroyChannel(channelName string) error {
 func (rmq *RocksMQ) CreateConsumerGroup(groupName string, channelName string) (*Consumer, error) {
 	key := groupName + "/" + channelName + "/current_id"
 	if rmq.checkKeyExist(key) {
+		log.Debug("RocksMQ: " + key + " existed.")
 		return nil, fmt.Errorf("ConsumerGroup %s already exists", groupName)
 	}
 	err := rmq.kv.Save(key, DefaultMessageID)
 	if err != nil {
+		log.Debug("RocksMQ: save " + key + " failed.")
 		return nil, err
 	}
 
@@ -189,6 +197,7 @@ func (rmq *RocksMQ) DestroyConsumerGroup(groupName string, channelName string) e
 
 	err := rmq.kv.Remove(key)
 	if err != nil {
+		log.Debug("RocksMQ: remove " + key + " failed.")
 		return err
 	}
 
@@ -202,10 +211,12 @@ func (rmq *RocksMQ) Produce(channelName string, messages []ProducerMessage) erro
 	idStart, idEnd, err := rmq.idAllocator.Alloc(uint32(msgLen))
 
 	if err != nil {
+		log.Debug("RocksMQ: alloc id failed.")
 		return err
 	}
 
 	if UniqueID(msgLen) != idEnd-idStart {
+		log.Debug("RocksMQ: Obtained id length is not equal that of message")
 		return errors.New("Obtained id length is not equal that of message")
 	}
 
@@ -214,6 +225,7 @@ func (rmq *RocksMQ) Produce(channelName string, messages []ProducerMessage) erro
 	for i := 0; i < msgLen && idStart+UniqueID(i) < idEnd; i++ {
 		key, err := combKey(channelName, idStart+UniqueID(i))
 		if err != nil {
+			log.Debug("RocksMQ: combKey(" + channelName + "," + strconv.FormatInt(idStart+UniqueID(i), 10) + ")")
 			return err
 		}
 
@@ -222,6 +234,7 @@ func (rmq *RocksMQ) Produce(channelName string, messages []ProducerMessage) erro
 
 	err = rmq.store.Write(gorocksdb.NewDefaultWriteOptions(), batch)
 	if err != nil {
+		log.Debug("RocksMQ: write batch failed")
 		return err
 	}
 
@@ -229,12 +242,14 @@ func (rmq *RocksMQ) Produce(channelName string, messages []ProducerMessage) erro
 	kvChannelBeginID := channelName + "/begin_id"
 	beginIDValue, err := rmq.kv.Load(kvChannelBeginID)
 	if err != nil {
+		log.Debug("RocksMQ: load " + kvChannelBeginID + " failed")
 		return err
 	}
 
 	kvValues := make(map[string]string)
 
 	if beginIDValue == "0" {
+		log.Debug("RocksMQ: overwrite " + kvChannelBeginID + " with " + strconv.FormatInt(idStart, 10))
 		kvValues[kvChannelBeginID] = strconv.FormatInt(idStart, 10)
 	}
 
@@ -243,6 +258,7 @@ func (rmq *RocksMQ) Produce(channelName string, messages []ProducerMessage) erro
 
 	err = rmq.kv.MultiSave(kvValues)
 	if err != nil {
+		log.Debug("RocksMQ: multisave failed")
 		return err
 	}
 
@@ -260,6 +276,7 @@ func (rmq *RocksMQ) Consume(groupName string, channelName string, n int) ([]Cons
 	metaKey := groupName + "/" + channelName + "/current_id"
 	currentID, err := rmq.kv.Load(metaKey)
 	if err != nil {
+		log.Debug("RocksMQ: load " + metaKey + " failed")
 		return nil, err
 	}
 
@@ -272,6 +289,7 @@ func (rmq *RocksMQ) Consume(groupName string, channelName string, n int) ([]Cons
 
 	fixChanName, err := fixChannelName(channelName)
 	if err != nil {
+		log.Debug("RocksMQ: fixChannelName " + channelName + " failed")
 		return nil, err
 	}
 	dataKey := fixChanName + "/" + currentID
@@ -294,6 +312,7 @@ func (rmq *RocksMQ) Consume(groupName string, channelName string, n int) ([]Cons
 		offset++
 		msgID, err := strconv.ParseInt(string(key.Data())[FixedChannelNameLen+1:], 10, 64)
 		if err != nil {
+			log.Debug("RocksMQ: parse int " + string(key.Data())[FixedChannelNameLen+1:] + " failed")
 			return nil, err
 		}
 		msg := ConsumerMessage{
@@ -305,17 +324,20 @@ func (rmq *RocksMQ) Consume(groupName string, channelName string, n int) ([]Cons
 		val.Free()
 	}
 	if err := iter.Err(); err != nil {
+		log.Debug("RocksMQ: get error from iter.Err()")
 		return nil, err
 	}
 
 	// When already consume to last mes, an empty slice will be returned
 	if len(consumerMessage) == 0 {
+		log.Debug("RocksMQ: consumerMessage is empty")
 		return consumerMessage, nil
 	}
 
 	newID := consumerMessage[len(consumerMessage)-1].MsgID
 	err = rmq.Seek(groupName, channelName, newID)
 	if err != nil {
+		log.Debug("RocksMQ: Seek(" + groupName + "," + channelName + "," + strconv.FormatInt(newID, 10) + ") failed")
 		return nil, err
 	}
 
@@ -326,22 +348,26 @@ func (rmq *RocksMQ) Seek(groupName string, channelName string, msgID UniqueID) e
 	/* Step I: Check if key exists */
 	key := groupName + "/" + channelName + "/current_id"
 	if !rmq.checkKeyExist(key) {
+		log.Debug("RocksMQ: channel " + key + " not exists")
 		return fmt.Errorf("ConsumerGroup %s, channel %s not exists", groupName, channelName)
 	}
 
 	storeKey, err := combKey(channelName, msgID)
 	if err != nil {
+		log.Debug("RocksMQ: combKey(" + channelName + "," + strconv.FormatInt(msgID, 10) + ") failed")
 		return err
 	}
 
 	_, err = rmq.store.Get(gorocksdb.NewDefaultReadOptions(), []byte(storeKey))
 	if err != nil {
+		log.Debug("RocksMQ: get " + storeKey + " failed")
 		return err
 	}
 
 	/* Step II: Save current_id in kv */
 	err = rmq.kv.Save(key, strconv.FormatInt(msgID, 10))
 	if err != nil {
+		log.Debug("RocksMQ: save " + key + " failed")
 		return err
 	}