Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/15986#discussion_r89416964
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/TaskSchedulerImpl.scala ---
@@ -88,10 +88,12 @@ private[spark] class TaskSchedulerImpl(
// Incrementing task IDs
val nextTaskId = new AtomicLong(0)
- // Number of tasks running on each executor
- private val executorIdToTaskCount = new HashMap[String, Int]
+ // IDs of the tasks running on each executor
+ private val executorIdToRunningTaskIds = new HashMap[String,
HashSet[Long]]
- def runningTasksByExecutors(): Map[String, Int] =
executorIdToTaskCount.toMap
+ def runningTasksByExecutors(): Map[String, Int] = synchronized {
+ executorIdToRunningTaskIds.toMap.mapValues(_.size)
--- End diff --
We need this to convert from a mutable to immutable map.
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