squito commented on a change in pull request #23767: [SPARK-26329][CORE] Faster 
polling of executor memory metrics.
URL: https://github.com/apache/spark/pull/23767#discussion_r269274802
 
 

 ##########
 File path: 
core/src/test/scala/org/apache/spark/scheduler/DAGSchedulerSuite.scala
 ##########
 @@ -143,7 +143,7 @@ class DAGSchedulerSuite extends SparkFunSuite with 
LocalSparkContext with TimeLi
         execId: String,
         accumUpdates: Array[(Long, Seq[AccumulatorV2[_, _]])],
         blockManagerId: BlockManagerId,
-        executorUpdates: ExecutorMetrics): Boolean = true
+        executorUpdates: scala.collection.Map[(Int, Int), ExecutorMetrics]): 
Boolean = true
 
 Review comment:
   is there any particular reason you're using `scala.collection.Map` instead 
of `scala.collection.mutable.Map`?  we're already using mutable data structures 
here, so it just seems to complicate things a bit.

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