chickenchickenlove commented on code in PR #15573:
URL: https://github.com/apache/kafka/pull/15573#discussion_r1543099933


##########
streams/src/main/java/org/apache/kafka/streams/processor/internals/StreamsPartitionAssignor.java:
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@@ -523,7 +523,17 @@ private RepartitionTopics prepareRepartitionTopics(final 
Cluster metadata) {
         final boolean isMissingInputTopics = 
!repartitionTopics.missingSourceTopicExceptions().isEmpty();
         if (isMissingInputTopics) {
             if (!taskManager.topologyMetadata().hasNamedTopologies()) {
-                throw new MissingSourceTopicException("Missing source 
topics.");

Review Comment:
   @mjsax Thanks for your kindful descriptions. it was very helpful for me 🙇‍♂️ 
   
   > 1.This current code is not producing a log message:
   I misunderstood, thanks for your time.
   I added `log.error()` through this 
[commit](https://github.com/apache/kafka/pull/15573/commits/fb957dbfc757d62fc5fe4ede4921ec011be96fa2).
   
   
   > I would propose to actually change AssignorError to contain a proper 
String.
   I agree with you. 
   Here's how I've implemented it based on your suggestion. 
   I don't know all the meaning of error codes exactly, so I referred to the 
existing error logs message related with error codes to write the messages. 
   
   What do you think? Do you think i'm on right direction?
   When you have some free time, Please take a look 🙇‍♂️.



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