java.io.IOException: Filesystem closed

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java.io.IOException: Filesystem closed
at org.apache.hadoop.hdfs.DFSClient.checkOpen(DFSClient.java:297)
at org.apache.hadoop.hdfs.DFSInputStream.close(DFSInputStream.java:426)
at java.io.FilterInputStream.close(FilterInputStream.java:155)
at org.apache.hadoop.io.SequenceFile$Reader.close(SequenceFile.java:1653)
at undefined.Mapper_Reader20HM4.CleanUp(Mapper_Reader20HM4.java:124)
at undefined.BFMapper20HM9.close(BFMapper20HM9.java:264)
at undefined.BFMapRunner20HM9.run(BFMapRunner20HM9.java:95)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:397)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:330)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:742)

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