diff --git a/cdc/model/mq.go b/cdc/model/mq.go
index 844ac21a672..3af4481bc18 100644
--- a/cdc/model/mq.go
+++ b/cdc/model/mq.go
@@ -3,6 +3,7 @@ package model
 import (
 	"bytes"
 	"encoding/json"
+	"fmt"
 
 	"github.com/pingcap/errors"
 	"github.com/pingcap/parser/model"
@@ -128,15 +129,20 @@ func (batch *BatchMsg) HasNext() bool {
 }
 
 func (batch *BatchMsg) Next() ([]byte, []byte, error) {
+	fmt.Printf("before get key len: %d\n", batch.keyBuf.Len())
 	_, keyLen, err := codec.DecodeInt(batch.keyBuf.Next(8))
 	if err != nil {
 		return nil, nil, err
 	}
+	fmt.Printf("before get key: %d\n", keyLen)
 	key := batch.keyBuf.Next(int(keyLen))
+
+	fmt.Printf("before get value len: %d\n", batch.valueBuf.Len())
 	_, valueLen, err := codec.DecodeInt(batch.valueBuf.Next(8))
 	if err != nil {
 		return nil, nil, err
 	}
+	fmt.Printf("before get value: %d\n", valueLen)
 	value := batch.valueBuf.Next(int(valueLen))
 	return key, value, nil
 }
diff --git a/cdc/model/mq_test.go b/cdc/model/mq_test.go
new file mode 100644
index 00000000000..b67a1f10b7f
--- /dev/null
+++ b/cdc/model/mq_test.go
@@ -0,0 +1,12 @@
+package model
+
+import (
+	"github.com/pingcap/check"
+)
+
+type batchMsgSuite struct{}
+
+var _ = check.Suite(&batchMsgSuite{})
+
+func (s *batchMsgSuite) TestBatchMsg(c *check.C) {
+}
diff --git a/cdc/sink/mqProducer/kafka.go b/cdc/sink/mqProducer/kafka.go
index fac6ed64c9a..7af5c34ad6b 100644
--- a/cdc/sink/mqProducer/kafka.go
+++ b/cdc/sink/mqProducer/kafka.go
@@ -185,6 +185,7 @@ func (k *kafkaSaramaProducer) runWorker(ctx context.Context) error {
 					Value:     sarama.ByteEncoder(value),
 					Partition: int32(partition),
 				}
+				fmt.Printf("flush to downstream key %x value %x\n", key, value)
 				if resolved {
 					msg.Metadata = resolvedTs
 				}
diff --git a/kafka_consumer/main.go b/kafka_consumer/main.go
index 64b778e9b41..eb40aba1368 100644
--- a/kafka_consumer/main.go
+++ b/kafka_consumer/main.go
@@ -306,8 +306,9 @@ func (c *Consumer) ConsumeClaim(session sarama.ConsumerGroupSession, claim saram
 	}
 	batchMsg := model.NewBatchMsg()
 	for message := range claim.Messages() {
-		log.Debug("Message claimed", zap.Int32("partition", message.Partition), zap.ByteString("key", message.Key), zap.ByteString("value", message.Value))
+		log.Info("Message claimed", zap.Int32("partition", message.Partition), zap.ByteString("key", message.Key), zap.ByteString("value", message.Value))
 		batchMsg.SetRaw(message.Key, message.Value)
+		fmt.Printf("msg key %x value %x\n", message.Key, message.Value)
 		for batchMsg.HasNext() {
 			keyBytes, valueBytes, err := batchMsg.Next()
 			if err != nil {
@@ -330,6 +331,7 @@ func (c *Consumer) ConsumeClaim(session sarama.ConsumerGroupSession, claim saram
 				ddl := new(model.DDLEvent)
 				ddl.FromMqMessage(key, value)
 				c.appendDDL(ddl)
+				fmt.Printf("get ddl event %v\n", ddl)
 			case model.MqMessageTypeRow:
 				globalResolvedTs := atomic.LoadUint64(&c.globalResolvedTs)
 				if key.Ts <= globalResolvedTs || key.Ts <= sink.resolvedTs {
@@ -349,6 +351,7 @@ func (c *Consumer) ConsumeClaim(session sarama.ConsumerGroupSession, claim saram
 				if err != nil {
 					log.Fatal("emit row changed event failed", zap.Error(err))
 				}
+				fmt.Printf("get row event %v\n", row)
 			case model.MqMessageTypeResolved:
 				err := sink.EmitRowChangedEvent(ctx, &model.RowChangedEvent{Ts: key.Ts, Resolved: true})
 				if err != nil {
@@ -358,6 +361,7 @@ func (c *Consumer) ConsumeClaim(session sarama.ConsumerGroupSession, claim saram
 				if resolvedTs < key.Ts {
 					atomic.StoreUint64(&sink.resolvedTs, key.Ts)
 				}
+				fmt.Printf("get resolved event %v\n", resolvedTs)
 			}
 			session.MarkMessage(message, "")
 		}