chia7712 commented on code in PR #21014:
URL: https://github.com/apache/kafka/pull/21014#discussion_r2572056461


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupCoordinatorService.java:
##########
@@ -345,7 +345,7 @@ public GroupCoordinatorService build() {
      * The metadata image to extract topic id to names map.
      * This is initialised when the {@link 
GroupCoordinator#onNewMetadataImage(CoordinatorMetadataImage, 
CoordinatorMetadataDelta)} is called
      */
-    private CoordinatorMetadataImage metadataImage = null;
+    private volatile CoordinatorMetadataImage metadataImage = null;

Review Comment:
   I assume those changes are bug fixes, and the 4.1 branch may have a next 
release.



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