[GitHub] [spark] liupc commented on a change in pull request #27002: [SPARK-30346]Improve logging when events dropped

[GitBox <gi...@apache.org>]

liupc commented on a change in pull request #27002: [SPARK-30346]Improve logging when events dropped
URL: https://github.com/apache/spark/pull/27002#discussion_r361300152
 
 

 ##########
 File path: core/src/main/scala/org/apache/spark/scheduler/AsyncEventQueue.scala
 ##########
 @@ -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)) {
-          val prevLastReportTimestamp = lastReportTimestamp
-          lastReportTimestamp = System.currentTimeMillis()
+      if (curTime - lastReportTime >= 60 * 1000) {
 
 Review comment:
   Done

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