Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/3204#discussion_r20389495
--- Diff:
core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala ---
@@ -110,6 +117,8 @@ private[spark] class ExecutorAllocationManager(sc:
SparkContext) extends Logging
// Clock used to schedule when executors should be added and removed
private var clock: Clock = new RealClock
+ private var listener: ExecutorAllocationListener = _
--- End diff --
also, let's just instantiate the listener here to avoid the need for null
checks later
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