liangyepianzhou commented on code in PR #18981:
URL: https://github.com/apache/pulsar/pull/18981#discussion_r1052807610


##########
pulsar-client/src/main/java/org/apache/pulsar/client/impl/BatchMessageIdImpl.java:
##########
@@ -71,11 +72,14 @@ public int getBatchIndex() {
     @Override
     public int compareTo(@Nonnull MessageId o) {
         if (o instanceof MessageIdImpl) {
+            if (!(o instanceof BatchMessageIdImpl)) {
+                throw new 
UnsupportedOperationException(this.getClass().getName()

Review Comment:
   If we use the way of throwing exceptions then `illegalArgumentException` may 
be better here when the BatchMessageID and MessageID have the same ledger ID 
and entry ID.



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