liangyepianzhou commented on code in PR #20880:
URL: https://github.com/apache/pulsar/pull/20880#discussion_r1278692648


##########
pulsar-client/src/main/java/org/apache/pulsar/client/impl/TransactionMetaStoreHandler.java:
##########
@@ -167,6 +167,8 @@ public CompletableFuture<Void> connectionOpened(ClientCnx 
cnx) {
                     return null;
                 });
             } else {
+                LOG.warn("Can not connect to the transaction coordinator 
because the protocol version {} is "
+                                + "lower than 19", 
cnx.getRemoteEndpointProtocolVersion());
                 registerToConnection(cnx);

Review Comment:
   The broker version should keep consistent if the client proto version is 
lower than 18.



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