[GitHub] zentol commented on a change in pull request #6599: [FLINK-10150][metrics] Fix OperatorMetricGroup creation for Batch

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zentol commented on a change in pull request #6599: [FLINK-10150][metrics] Fix OperatorMetricGroup creation for Batch
URL: https://github.com/apache/flink/pull/6599#discussion_r214614670
 
 

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 File path: flink-runtime/src/main/java/org/apache/flink/runtime/metrics/groups/TaskMetricGroup.java
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 @@ -144,15 +144,17 @@ public OperatorMetricGroup addOperator(OperatorID operatorID, String name) {
 			name = name.substring(0, METRICS_OPERATOR_NAME_MAX_LENGTH);
 		}
 		OperatorMetricGroup operator = new OperatorMetricGroup(this.registry, this, operatorID, name);
+		// unique OperatorIDs only exist in streaming, so we have to rely on the name for batch operators
+		final String key = operatorID + name;
 
 		synchronized (this) {
-			OperatorMetricGroup previous = operators.put(operatorID, operator);
+			OperatorMetricGroup previous = operators.put(key, operator);
 
 Review comment:
   I will rename the method but leave the code as is. It was intentionally written that way so that we only do a single lookup on the happy path. The default implementation of `putIfAbsent` is just syntactic sugar for separate get/put calls. While the HashMap _implementation_ of this method is indeed more efficient in this regard this is an implementation detail.

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