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https://issues.apache.org/jira/browse/SPARK-28839?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Marcelo Vanzin resolved SPARK-28839.
------------------------------------
    Fix Version/s: 3.0.0
       Resolution: Fixed

Issue resolved by pull request 25551
[https://github.com/apache/spark/pull/25551]

> ExecutorMonitor$Tracker NullPointerException
> --------------------------------------------
>
>                 Key: SPARK-28839
>                 URL: https://issues.apache.org/jira/browse/SPARK-28839
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 3.0.0
>            Reporter: Yuming Wang
>            Assignee: Hyukjin Kwon
>            Priority: Major
>             Fix For: 3.0.0
>
>
> {noformat}
> 19/08/21 06:44:01 ERROR AsyncEventQueue: Listener ExecutorMonitor threw an 
> exception
> java.lang.NullPointerException
>       at 
> org.apache.spark.scheduler.dynalloc.ExecutorMonitor$Tracker.removeShuffle(ExecutorMonitor.scala:479)
>       at 
> org.apache.spark.scheduler.dynalloc.ExecutorMonitor.$anonfun$cleanupShuffle$2(ExecutorMonitor.scala:408)
>       at 
> org.apache.spark.scheduler.dynalloc.ExecutorMonitor.$anonfun$cleanupShuffle$2$adapted(ExecutorMonitor.scala:407)
>       at scala.collection.Iterator.foreach(Iterator.scala:941)
>       at scala.collection.Iterator.foreach$(Iterator.scala:941)
>       at scala.collection.AbstractIterator.foreach(Iterator.scala:1429)
>       at scala.collection.IterableLike.foreach(IterableLike.scala:74)
>       at scala.collection.IterableLike.foreach$(IterableLike.scala:73)
>       at scala.collection.AbstractIterable.foreach(Iterable.scala:56)
>       at 
> org.apache.spark.scheduler.dynalloc.ExecutorMonitor.cleanupShuffle(ExecutorMonitor.scala:407)
>       at 
> org.apache.spark.scheduler.dynalloc.ExecutorMonitor.onOtherEvent(ExecutorMonitor.scala:351)
>       at 
> org.apache.spark.scheduler.SparkListenerBus.doPostEvent(SparkListenerBus.scala:82)
>       at 
> org.apache.spark.scheduler.SparkListenerBus.doPostEvent$(SparkListenerBus.scala:28)
>       at 
> org.apache.spark.scheduler.AsyncEventQueue.doPostEvent(AsyncEventQueue.scala:37)
>       at 
> org.apache.spark.scheduler.AsyncEventQueue.doPostEvent(AsyncEventQueue.scala:37)
>       at org.apache.spark.util.ListenerBus.postToAll(ListenerBus.scala:99)
>       at org.apache.spark.util.ListenerBus.postToAll$(ListenerBus.scala:84)
>       at 
> org.apache.spark.scheduler.AsyncEventQueue.super$postToAll(AsyncEventQueue.scala:102)
>       at 
> org.apache.spark.scheduler.AsyncEventQueue.$anonfun$dispatch$1(AsyncEventQueue.scala:102)
>       at 
> scala.runtime.java8.JFunction0$mcJ$sp.apply(JFunction0$mcJ$sp.java:23)
>       at scala.util.DynamicVariable.withValue(DynamicVariable.scala:62)
>       at 
> org.apache.spark.scheduler.AsyncEventQueue.org$apache$spark$scheduler$AsyncEventQueue$$dispatch(AsyncEventQueue.scala:97)
>       at 
> org.apache.spark.scheduler.AsyncEventQueue$$anon$2.$anonfun$run$1(AsyncEventQueue.scala:93)
>       at org.apache.spark.util.Utils$.tryOrStopSparkContext(Utils.scala:1319)
>       at 
> org.apache.spark.scheduler.AsyncEventQueue$$anon$2.run(AsyncEventQueue.scala:93)
> {noformat}



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