Github user jiangxb1987 commented on a diff in the pull request:
https://github.com/apache/spark/pull/18492#discussion_r128452352
--- Diff:
core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala ---
@@ -572,20 +572,35 @@ private[spark] class ExecutorAllocationManager(
}
/**
+ * Callback invoked when an extra executor is needed (See SPARK-19326)
+ */
+ private def onExtraExecutorNeeded(): Unit = synchronized {
+ val maxNeeded = math.max(math.min(maxNumExecutorsNeeded + 1,
maxNumExecutors), minNumExecutors)
--- End diff --
Perhaps what we need is just to ensure there are more than two active
executors left, so we may meet the locality requirement and launch the
speculative jobs?
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