mxm commented on code in PR #24564:
URL: https://github.com/apache/flink/pull/24564#discussion_r1541043451


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flink-runtime/src/main/java/org/apache/flink/runtime/rest/handler/legacy/metrics/MetricStore.java:
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@@ -538,19 +556,19 @@ public TaskMetricStore getTaskMetricStore(String taskID) {
     @ThreadSafe
     public static class TaskMetricStore extends ComponentMetricStore {
         private final Map<Integer, SubtaskMetricStore> subtasks;
-        private final Map<String, ComponentMetricStore> jmOperators;
+        private final ComponentMetricStore jmOperator;

Review Comment:
   After reading the rest of the code, this seems to be the case. Retrieving 
all the coordinator metrics at once for a task seems reasonable.



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