AndrewJSchofield commented on code in PR #22257:
URL: https://github.com/apache/kafka/pull/22257#discussion_r3247123663


##########
share-coordinator/src/main/java/org/apache/kafka/coordinator/share/ShareCoordinatorShard.java:
##########
@@ -777,7 +777,8 @@ private 
Optional<CoordinatorResult<WriteShareGroupStateResponseData, Coordinator
         Optional<CoordinatorMetadataImage.TopicMetadata> topicMetadataOp = 
metadataImage.topicMetadata(topicId);
         if (topicMetadataOp.isEmpty() ||
             topicMetadataOp.get().partitionCount() <= partitionId) {
-            log.error("Topic/TopicPartition not found in metadata image.");
+            log.error("Topic or partition not found in metadata image when 
writing: {}:{}-{}.", topicId,
+                
topicMetadataOp.map(CoordinatorMetadataImage.TopicMetadata::name).orElse("null"),
 partitionId);

Review Comment:
   I've taken a look at this and I don't think it helps. If I just make the 
`log.error` line a private method, it probably harms the readability because 
it's a trivial method and I can't see what it does without going to the method.
   
   If I instead take the entire if block, that is also tricky because the 
construction of the error response is operation-dependent.
   
   So I prefer to leave as is in this case.



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