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java.io.IOException: Filesystem closed	at org.apache.hadoop.hdfs.DFSClient.checkOpen(DFSClient.java:795)	at org.apache.hadoop.hdfs.DFSOutputStream.flushOrSync(DFSOutputStream.java:1985)	at org.apache.hadoop.hdfs.DFSOutputStream.hflush(DFSOutputStream.java:1946)	at org.apache.hadoop.fs.FSDataOutputStream.hflush(FSDataOutputStream.java:130)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	at org.apache.spark.scheduler.EventLoggingListener$$anonfun$logEvent$3.apply(EventLoggingListener.scala:150)	at org.apache.spark.scheduler.EventLoggingListener$$anonfun$logEvent$3.apply(EventLoggingListener.scala:150)	at scala.Option.foreach(Option.scala:236)	at org.apache.spark.scheduler.EventLoggingListener.logEvent(EventLoggingListener.scala:150)	at org.apache.spark.scheduler.EventLoggingListener.onUnpersistRDD(EventLoggingListener.scala:186)	at org.apache.spark.scheduler.SparkListenerBus$class.onPostEvent(SparkListenerBus.scala:50)	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:55)	at org.apache.spark.util.AsynchronousListenerBus.postToAll(AsynchronousListenerBus.scala:37)	at org.apache.spark.util.AsynchronousListenerBus$$anon$1$$anonfun$run$1$$anonfun$apply$mcV$sp$1.apply$mcV$sp(AsynchronousListenerBus.scala:80)	at org.apache.spark.util.AsynchronousListenerBus$$anon$1$$anonfun$run$1$$anonfun$apply$mcV$sp$1.apply(AsynchronousListenerBus.scala:65)	at org.apache.spark.util.AsynchronousListenerBus$$anon$1$$anonfun$run$1$$anonfun$apply$mcV$sp$1.apply(AsynchronousListenerBus.scala:65)	at scala.util.DynamicVariable.withValue(DynamicVariable.scala:57)	at org.apache.spark.util.AsynchronousListenerBus$$anon$1$$anonfun$run$1.apply$mcV$sp(AsynchronousListenerBus.scala:64)	at org.apache.spark.util.Utils$.tryOrStopSparkContext(Utils.scala:1180)	at org.apache.spark.util.AsynchronousListenerBus$$anon$1.run(AsynchronousListenerBus.scala:63)