chummyhe89 commented on a change in pull request #24556: [SPARK-27641][CORE] 
Fix MetricsSystem to remove unregistered source correctly
URL: https://github.com/apache/spark/pull/24556#discussion_r282328568
 
 

 ##########
 File path: core/src/main/scala/org/apache/spark/metrics/MetricsSystem.scala
 ##########
 @@ -166,9 +166,11 @@ private[spark] class MetricsSystem private (
   }
 
   def removeSource(source: Source) {
-    sources -= source
-    val regName = buildRegistryName(source)
-    registry.removeMatching((name: String, _: Metric) => 
name.startsWith(regName))
+    if (sources.contains(source)) {
+      sources -= source
 
 Review comment:
   I add existing check because original code removes the metrics no matter 
whether the source was registered or not. i will use index to avoid the twice 
navigating.thanks for your advice.

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