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[SPARK-4750] Dynamic allocation - synchronize kills #3612

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[SPARK-4750] Dynamic allocation - synchronize kills #3612

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2 changes: 1 addition & 1 deletion core/src/main/scala/org/apache/spark/scheduler/cluster/CoarseGrainedSchedulerBackend.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -334,7 +334,7 @@ class CoarseGrainedSchedulerBackend(scheduler: TaskSchedulerImpl, val actorSyste
* Request that the cluster manager kill the specified executors.
* Return whether the kill request is acknowledged.
*/
final def killExecutors(executorIds: Seq[String]): Boolean = {
final def killExecutors(executorIds: Seq[String]): Boolean = synchronized {
logInfo(s"Requesting to kill executor(s) ${executorIds.mkString(", ")}")
val filteredExecutorIds = new ArrayBuffer[String]
executorIds.foreach { id =>
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