divijvaidya commented on code in PR #12590:
URL: https://github.com/apache/kafka/pull/12590#discussion_r1000612569


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/Fetcher.java:
##########
@@ -446,6 +429,31 @@ private RequestFuture<ClientResponse> 
sendMetadataRequest(MetadataRequest.Builde
             return client.send(node, request);
     }
 
+    /**
+     * Send Fetch Request to Kafka cluster asynchronously.
+     *
+     * This method is visible for testing.
+     *
+     * @return A future that indicates result of sent Fetch request
+     */
+    RequestFuture<ClientResponse> sendFetchRequestToNode(final 
FetchSessionHandler.FetchRequestData requestData,
+                                                         final Node 
fetchTarget) {
+        final short maxVersion = requestData.canUseTopicIds() ? 
ApiKeys.FETCH.latestVersion() : (short) 12;

Review Comment:
   I have added a comment to clarify the meaning of the number 12. A 
programmatic way would be to create a static method something like 
"getLowestVersionForTopicIDs()" but I couldn't find a good place to add it. It 
may also require a KIP if we add it to a class which has public APIs. Leaving 
it as numeral 12 with a comment for now.



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