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_r167148083
 
 

 ##########
 File path: 
pulsar-client/src/main/java/org/apache/pulsar/client/api/Consumer.java
 ##########
 @@ -278,4 +277,18 @@
      * @return a future to track the completion of the seek operation
      */
     CompletableFuture<Void> seekAsync(MessageId messageId);
+
+    /**
+     * Check if there is message that has been published successfully to the 
broker in the topic.
+     *
+     * Note: this operation can only be done on non-partitioned persistent 
topics.
+     * For partitioned topics, one can rather perform the hasMessageAvailable 
on the individual partitions.
+     */
+    Boolean hasMessageAvailable() throws PulsarClientException;
+
+    /**
+     * Asynchronously Check if there is message that has been published 
successfully to the broker in the topic.
+     */
+    CompletableFuture<Boolean> hasMessageAvailableAsync();
 
 Review comment:
   Get it. will hide it here.

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