Github user xuanyuanking commented on a diff in the pull request: https://github.com/apache/spark/pull/22165#discussion_r215636283 --- Diff: core/src/main/scala/org/apache/spark/BarrierCoordinator.scala --- @@ -187,6 +191,9 @@ private[spark] class BarrierCoordinator( requesters.clear() cancelTimerTask() } + + // Check for clearing internal data, visible for test only. + private[spark] def cleanCheck(): Boolean = requesters.isEmpty && timerTask == null --- End diff -- Add internal data clean check in Xingbo's comments: https://github.com/apache/spark/pull/22165#issuecomment-415086679.
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