HeartSaVioR commented on a change in pull request #27002: [SPARK-30346]Improve
logging when events dropped
URL: https://github.com/apache/spark/pull/27002#discussion_r361573232
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File path: core/src/main/scala/org/apache/spark/scheduler/AsyncEventQueue.scala
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@@ -167,20 +170,29 @@ private class AsyncEventQueue(
}
logTrace(s"Dropping event $event")
- val droppedCount = droppedEventsCounter.get
+ val droppedCount = droppedEventsCounter.get - lastDroppedEventsCounter
+ val lastReportTime = lastReportTimestamp.get
+ val curTime = System.currentTimeMillis()
if (droppedCount > 0) {
// Don't log too frequently
- if (System.currentTimeMillis() - lastReportTimestamp >= 60 * 1000) {
- // There may be multiple threads trying to decrease
droppedEventsCounter.
- // Use "compareAndSet" to make sure only one thread can win.
- // And if another thread is increasing droppedEventsCounter,
"compareAndSet" will fail and
- // then that thread will update it.
- if (droppedEventsCounter.compareAndSet(droppedCount, 0)) {
Review comment:
So if I understand correctly, droppedEventsCounter can be changed between
L170 to L178 even without contention of L178, as L161 allows other threads to
increase the value as well. So if the contention occurs continuously,
effectively no one will pass this if statement. Do I understand correctly?
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