jeffkbkim commented on code in PR #14387:
URL: https://github.com/apache/kafka/pull/14387#discussion_r1385307246


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupCoordinatorShard.java:
##########
@@ -160,11 +161,14 @@ public GroupCoordinatorShard build() {
             if (timer == null)
                 throw new IllegalArgumentException("Timer must be set.");
             if (coordinatorMetrics == null)
-                throw new IllegalArgumentException("CoordinatorMetricsShard 
must be set.");
+                throw new IllegalArgumentException("CoordinatorMetrics must be 
set.");
             if (topicPartition == null)
                 throw new IllegalArgumentException("TopicPartition must be 
set.");
 
             CoordinatorMetricsShard metricsShard = 
coordinatorMetrics.newMetricsShard(snapshotRegistry, topicPartition);
+            if (!(metricsShard instanceof GroupCoordinatorMetricsShard))

Review Comment:
   ah yes. thanks



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