zhaijack commented on a change in pull request #1103: PIP-13-1/3: Provide 
`TopicsConsumer` to consume from several topics under same namespace
URL: https://github.com/apache/incubator-pulsar/pull/1103#discussion_r167252486
 
 

 ##########
 File path: 
pulsar-client/src/main/java/org/apache/pulsar/client/api/MessageId.java
 ##########
 @@ -37,6 +36,16 @@
      */
     byte[] toByteArray();
 
+    /**
+     * Get the topic name of this MessageId.
+     * This is mainly for TopicsConsumerImpl to identify a message belongs to 
which topic.
+     *
+     * @return the topic name
+     */
+    default String getTopicName() {
 
 Review comment:
   Yes. It is as @merlimat metioned. for MessageId, we also need `topicName` 
for `redeliverUnacknowledgedMessages`.
   will remove it from MessageId

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