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https://issues.apache.org/jira/browse/SPARK-32027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17147746#comment-17147746
]
Jungtaek Lim commented on SPARK-32027:
--------------------------------------
There're two different problems:
# An event object is shared to all listeners subscribed to it. (If any
listener modifies the event object or any objects in the event object, it may
bring unexpected result.)
# Objects in event (properties in this case) are not always cloned. (There're
missing spots.)
The way to prevent these issue is creating event instance "per" listener as
well as making sure event instance doesn't share objects outside of event
instance (except things which are immutable).
The thing is that it's hard to guess how expensive is the overhead of doing it.
Maybe noticeable or maybe trivial.
> EventLoggingListener threw java.util.ConcurrentModificationException
> ---------------------------------------------------------------------
>
> Key: SPARK-32027
> URL: https://issues.apache.org/jira/browse/SPARK-32027
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 3.1.0
> Reporter: Yuming Wang
> Priority: Major
>
> {noformat}
> 20/06/18 20:22:25 ERROR AsyncEventQueue: Listener EventLoggingListener threw
> an exception
> java.util.ConcurrentModificationException
> at java.util.Hashtable$Enumerator.next(Hashtable.java:1387)
> at
> scala.collection.convert.Wrappers$JPropertiesWrapper$$anon$6.next(Wrappers.scala:424)
> at
> scala.collection.convert.Wrappers$JPropertiesWrapper$$anon$6.next(Wrappers.scala:420)
> at scala.collection.Iterator.foreach(Iterator.scala:941)
> at scala.collection.Iterator.foreach$(Iterator.scala:941)
> at scala.collection.AbstractIterator.foreach(Iterator.scala:1429)
> at scala.collection.IterableLike.foreach(IterableLike.scala:74)
> at scala.collection.IterableLike.foreach$(IterableLike.scala:73)
> at scala.collection.AbstractIterable.foreach(Iterable.scala:56)
> at scala.collection.TraversableLike.map(TraversableLike.scala:238)
> at scala.collection.TraversableLike.map$(TraversableLike.scala:231)
> at scala.collection.AbstractTraversable.map(Traversable.scala:108)
> at org.apache.spark.util.JsonProtocol$.mapToJson(JsonProtocol.scala:568)
> at
> org.apache.spark.util.JsonProtocol$.$anonfun$propertiesToJson$1(JsonProtocol.scala:574)
> at scala.Option.map(Option.scala:230)
> at
> org.apache.spark.util.JsonProtocol$.propertiesToJson(JsonProtocol.scala:573)
> at
> org.apache.spark.util.JsonProtocol$.jobStartToJson(JsonProtocol.scala:159)
> at
> org.apache.spark.util.JsonProtocol$.sparkEventToJson(JsonProtocol.scala:81)
> at
> org.apache.spark.scheduler.EventLoggingListener.logEvent(EventLoggingListener.scala:97)
> at
> org.apache.spark.scheduler.EventLoggingListener.onJobStart(EventLoggingListener.scala:159)
> at
> org.apache.spark.scheduler.SparkListenerBus.doPostEvent(SparkListenerBus.scala:37)
> at
> org.apache.spark.scheduler.SparkListenerBus.doPostEvent$(SparkListenerBus.scala:28)
> at
> org.apache.spark.scheduler.AsyncEventQueue.doPostEvent(AsyncEventQueue.scala:37)
> at
> org.apache.spark.scheduler.AsyncEventQueue.doPostEvent(AsyncEventQueue.scala:37)
> at org.apache.spark.util.ListenerBus.postToAll(ListenerBus.scala:115)
> at org.apache.spark.util.ListenerBus.postToAll$(ListenerBus.scala:99)
> at
> org.apache.spark.scheduler.AsyncEventQueue.super$postToAll(AsyncEventQueue.scala:105)
> at
> org.apache.spark.scheduler.AsyncEventQueue.$anonfun$dispatch$1(AsyncEventQueue.scala:105)
> at
> scala.runtime.java8.JFunction0$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$$dispatch(AsyncEventQueue.scala:100)
> at
> org.apache.spark.scheduler.AsyncEventQueue$$anon$2.$anonfun$run$1(AsyncEventQueue.scala:96)
> at org.apache.spark.util.Utils$.tryOrStopSparkContext(Utils.scala:1319)
> at
> org.apache.spark.scheduler.AsyncEventQueue$$anon$2.run(AsyncEventQueue.scala:96)
> 20/06/18 20:22:25 ERROR AsyncEventQueue: Listener EventLoggingListener threw
> an exception
> java.util.ConcurrentModificationException
> at java.util.Hashtable$Enumerator.next(Hashtable.java:1387)
> at
> scala.collection.convert.Wrappers$JPropertiesWrapper$$anon$6.next(Wrappers.scala:424)
> at
> scala.collection.convert.Wrappers$JPropertiesWrapper$$anon$6.next(Wrappers.scala:420)
> 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 scala.collection.TraversableLike.map(TraversableLike.scala:238)
> at scala.collection.TraversableLike.map$(TraversableLike.scala:231)
> at scala.collection.AbstractTraversable.map(Traversable.scala:108)
> at org.apache.spark.util.JsonProtocol$.mapToJson(JsonProtocol.scala:568)
> at
> org.apache.spark.util.JsonProtocol$.$anonfun$propertiesToJson$1(JsonProtocol.scala:574)
> at scala.Option.map(Option.scala:230)
> at
> org.apache.spark.util.JsonProtocol$.propertiesToJson(JsonProtocol.scala:573)
> at
> org.apache.spark.util.JsonProtocol$.jobStartToJson(JsonProtocol.scala:159)
> at
> org.apache.spark.util.JsonProtocol$.sparkEventToJson(JsonProtocol.scala:81)
> at
> org.apache.spark.scheduler.EventLoggingListener.logEvent(EventLoggingListener.scala:97)
> at
> org.apache.spark.scheduler.EventLoggingListener.onJobStart(EventLoggingListener.scala:159)
> at
> org.apache.spark.scheduler.SparkListenerBus.doPostEvent(SparkListenerBus.scala:37)
> 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:115)
> at org.apache.spark.util.ListenerBus.postToAll$(ListenerBus.scala:99)
> at
> org.apache.spark.scheduler.AsyncEventQueue.super$postToAll(AsyncEventQueue.scala:105)
> at
> org.apache.spark.scheduler.AsyncEventQueue.$anonfun$dispatch$1(AsyncEventQueue.scala:105)
> 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:100)
> at
> org.apache.spark.scheduler.AsyncEventQueue$$anon$2.$anonfun$run$1(AsyncEventQueue.scala:96)
> at org.apache.spark.util.Utils$.tryOrStopSparkContext(Utils.scala:1319)
> at
> org.apache.spark.scheduler.AsyncEventQueue$$anon$2.run(AsyncEventQueue.scala:96)
> {noformat}
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