congbobo184 commented on code in PR #18981:
URL: https://github.com/apache/pulsar/pull/18981#discussion_r1052333031


##########
pulsar-client/src/main/java/org/apache/pulsar/client/impl/MessageIdImpl.java:
##########
@@ -204,11 +204,13 @@ public byte[] toByteArray() {
     @Override
     public int compareTo(@Nonnull MessageId o) {
         if (o instanceof MessageIdImpl) {
+            if (o instanceof BatchMessageIdImpl) {
+                throw new 
UnsupportedOperationException(this.getClass().getName()

Review Comment:
   This may cause confusion for users, direct forbid may be more effective and 
easier to understand



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