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
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@@ -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`
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