nicktelford commented on code in PR #13993:
URL: https://github.com/apache/kafka/pull/13993#discussion_r1261034134


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/ConsumerCoordinator.java:
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@@ -119,6 +119,7 @@ public final class ConsumerCoordinator extends 
AbstractCoordinator {
     private Set<String> joinedSubscription;
     private MetadataSnapshot metadataSnapshot;
     private MetadataSnapshot assignmentSnapshot;
+    private boolean metadataUpdated;

Review Comment:
   Hmm, good point. I'm not sure how to encapsulate this inside 
`MetadataSnapshot` though, as the entire object is replaced when it's updated.
   
   Would it be enough to place the swap in a private method, say:
   ```
   private void updateAssignmentSnapshot() {
       assignmentSnapshot = metadataSnapshot;
       metadataUpdates = true;
   }
   ```



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