lucasbru commented on code in PR #15102:
URL: https://github.com/apache/kafka/pull/15102#discussion_r1439237727


##########
streams/src/main/java/org/apache/kafka/streams/processor/internals/StreamThread.java:
##########
@@ -1604,7 +1604,9 @@ public KafkaFuture<Map<String, KafkaFuture<Uuid>>> 
producersClientInstanceIds(fi
         }
 
         if 
(processingMode.equals(StreamsConfigUtils.ProcessingMode.EXACTLY_ONCE_ALPHA)) {
-            throw new UnsupportedOperationException("not yet implemented");
+            log.warn("EOS v1 enabled: Producer client instance IDs are not 
collected." +

Review Comment:
   I'd use ERROR, since this will only affect people who do want to use the new 
API and use EOSv1, so we should make this quite prominent. 



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