Spark 3.1.1 运行job的时候报错如下：
21/03/12 18:16:44 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$(IterableLike.scala:73)
at scala.collection.AbstractIterable.foreach(Iterable.scala:56)
at scala.collection.mutable.MapLike.toSeq(MapLike.scala:75)
at scala.collection.mutable.MapLike.toSeq$(MapLike.scala:72)
at scala.collection.mutable.AbstractMap.toSeq(Map.scala:82)
at org.apache.spark.scheduler.EventLoggingListener.redactProperties(EventLoggingListener.scala:290)
at org.apache.spark.scheduler.EventLoggingListener.onJobStart(EventLoggingListener.scala:162)
at org.apache.spark.scheduler.SparkListenerBus.doPostEvent(SparkListenerBus.scala:37)
at org.apache.spark.scheduler.SparkListenerBus.doPostEvent$(SparkListenerBus.scala:28)
at org.apache.spark.scheduler.AsyncEventQueue.doPostEvent(AsyncEventQueue.scala:37)
at org.apache.spark.scheduler.AsyncEventQueue.doPostEvent(AsyncEventQueue.scala:37)
at org.apache.spark.util.ListenerBus.postToAll(ListenerBus.scala:117)
at org.apache.spark.util.ListenerBus.postToAll$(ListenerBus.scala:101)
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:1379)
at org.apache.spark.scheduler.AsyncEventQueue$$anon$2.run(AsyncEventQueue.scala:96)
这个问题是spark自身的bug，在spark 3.1.2和spark 3.2.0已经修复了。如果你现在不方便升级spark版本，请在spark-defaults.conf中加入如下配置也可以规避：
spark.eventLog.enable=false
