lucasbru commented on code in PR #22213:
URL: https://github.com/apache/kafka/pull/22213#discussion_r3418981506


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group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java:
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@@ -2206,6 +2207,25 @@ private CoordinatorResult<StreamsGroupHeartbeatResult, 
CoordinatorRecord> stream
                 )
         ));
 
+        String rackAwareTagsValue = 
currentAssignmentConfigs.getOrDefault("rack.aware.assignment.tags", "");

Review Comment:
   Just take into account that these are stored in the 
StreamsGroupMetadataValue, and parsing then needs to happen on the replay path 
(when the group metadata loads). So any unhandled parse error will prevent the 
GC from starting. That's why we chose keeping this a simple string to string 
copy.



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