zhaijack commented on a change in pull request #1066: Issue 937: add
CommandGetLastMessageId to make reader know the end of topic
URL: https://github.com/apache/incubator-pulsar/pull/1066#discussion_r167156439
##########
File path: pulsar-client/src/main/java/org/apache/pulsar/client/api/Reader.java
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@@ -62,4 +62,14 @@
* Return true if the topic was terminated and this reader has reached the
end of the topic
*/
boolean hasReachedEndOfTopic();
+
+ /**
+ * Check if there is message that has been published successfully to the
broker in the topic.
+ */
+ Boolean hasMessageAvailable() throws PulsarClientException;
Review comment:
Yes. we have keep the value as `lastMessageIdInBroker` in `ConsumerImpl`, it
will return from client most of the time, will not call into broker.
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