merlimat 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_r166481485
 
 

 ##########
 File path: 
pulsar-client/src/main/java/org/apache/pulsar/client/impl/MessageIdImpl.java
 ##########
 @@ -39,10 +39,11 @@
     protected final long entryId;
     protected final int partitionIndex;
 
-    // Private constructor used only for json deserialization
-    @SuppressWarnings("unused")
-    private MessageIdImpl() {
-        this(-1, -1, -1);
+    // create MessageIdImpl use value of MessageId.earliest
+    public MessageIdImpl() {
 
 Review comment:
   Since the `MessageidImpl` is immutable, couldn't we just reference 
`MessageId.earliest` instead of constructing a new one equal to that?

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