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java.nio.channels.ClosedChannelException: 	at org.apache.hadoop.hdfs.DFSOutputStream.checkClosed(DFSOutputStream.java:1635)	at org.apache.hadoop.hdfs.DFSOutputStream.flushOrSync(DFSOutputStream.java:1999)	at org.apache.hadoop.hdfs.DFSOutputStream.hflush(DFSOutputStream.java:1959)	at org.apache.hadoop.fs.FSDataOutputStream.hflush(FSDataOutputStream.java:130)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.apache.spark.scheduler.EventLoggingListener$$anonfun$logEvent$3.apply(EventLoggingListener.scala:144)	at org.apache.spark.scheduler.EventLoggingListener$$anonfun$logEvent$3.apply(EventLoggingListener.scala:144)	at scala.Option.foreach(Option.scala:236)	at org.apache.spark.scheduler.EventLoggingListener.logEvent(EventLoggingListener.scala:144)	at org.apache.spark.scheduler.EventLoggingListener.onStageCompleted(EventLoggingListener.scala:165)	at org.apache.spark.scheduler.SparkListenerBus$class.onPostEvent(SparkListenerBus.scala:32)	at org.apache.spark.scheduler.LiveListenerBus.onPostEvent(LiveListenerBus.scala:31)	at org.apache.spark.scheduler.LiveListenerBus.onPostEvent(LiveListenerBus.scala:31)	at org.apache.spark.util.ListenerBus$class.postToAll(ListenerBus.scala:53)	at org.apache.spark.util.AsynchronousListenerBus.postToAll(AsynchronousListenerBus.scala:36)	at org.apache.spark.util.AsynchronousListenerBus$$anon$1$$anonfun$run$1.apply$mcV$sp(AsynchronousListenerBus.scala:76)	at org.apache.spark.util.AsynchronousListenerBus$$anon$1$$anonfun$run$1.apply(AsynchronousListenerBus.scala:61)	at org.apache.spark.util.AsynchronousListenerBus$$anon$1$$anonfun$run$1.apply(AsynchronousListenerBus.scala:61)	at org.apache.spark.util.Utils$.logUncaughtExceptions(Utils.scala:1617)	at org.apache.spark.util.AsynchronousListenerBus$$anon$1.run(AsynchronousListenerBus.scala:60)