mjsax commented on code in PR #20661:
URL: https://github.com/apache/kafka/pull/20661#discussion_r2433978636


##########
clients/src/main/java/org/apache/kafka/common/telemetry/internals/ClientTelemetryReporter.java:
##########
@@ -528,13 +529,13 @@ public void handleResponse(PushTelemetryResponse 
response) {
         @Override
         public void 
handleFailedGetTelemetrySubscriptionsRequest(KafkaException 
maybeFatalException) {
             log.debug("The broker generated an error for the get telemetry 
network API request", maybeFatalException);
-            handleFailedRequest(maybeFatalException != null);
+            handleFailedRequest(isRetryable(maybeFatalException));
         }
 
         @Override
         public void handleFailedPushTelemetryRequest(KafkaException 
maybeFatalException) {
             log.debug("The broker generated an error for the push telemetry 
network API request", maybeFatalException);
-            handleFailedRequest(maybeFatalException != null);
+            handleFailedRequest(isRetryable(maybeFatalException));

Review Comment:
   I agree. It's even an issue before this change, and I did raise this to 
@apoorvmittal10 at some point in the past...
   
   We get something like
   ```
   org.apache.kafka.common.errors.UnsupportedVersionException: The node does 
not support GET_TELEMETRY_SUBSCRIPTIONS
   ```
   
   This come from 
https://github.com/apache/kafka/blob/trunk/clients/src/main/java/org/apache/kafka/clients/NodeApiVersions.java#L149
   
   I always found it very annoying.



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