smjn commented on code in PR #18824:
URL: https://github.com/apache/kafka/pull/18824#discussion_r1946270238


##########
server-common/src/main/java/org/apache/kafka/server/share/persister/PersisterStateManager.java:
##########
@@ -356,16 +367,48 @@ public void onComplete(ClientResponse response) {
             if (onCompleteCallback != null) {
                 onCompleteCallback.accept(response);
             }
-            if (response != null && response.hasResponse()) {
-                if (isFindCoordinatorResponse(response)) {
+
+            // We don't know if FIND_COORD or actual REQUEST. Let's err on 
side of request.

Review Comment:
   @AndrewJSchofield Thanks for the review!
   No, the signature of `onComplete` cannot be changed as this method is 
declared in the general `RequestCompletionHandler` interface implemented by RPC 
handlers.
   The `InterBrokerSendThread` periodically calls `SendThread.generateRequests` 
which encapsulates the request as a `RequestAndCompletionHandler` whose 
argument for the request handler is `RequestCompletionHandler`. Then in 
`RequestCompletionHandler.onComplete` is called which only accepts the 
clientResponse.



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