Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/3710#discussion_r22243970
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/LiveListenerBus.scala ---
@@ -75,6 +78,11 @@ private[spark] class LiveListenerBus extends
SparkListenerBus with Logging {
}
def post(event: SparkListenerEvent) {
+ if (stopped) {
--- End diff --
Some cost, of cause. But comparing to the lock in `eventQueue.offer`, I
would like to say it can be ignored.
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