Got an exception from ClientFinalizer when the JT is terminated
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                 Key: HADOOP-3998
                 URL: https://issues.apache.org/jira/browse/HADOOP-3998
             Project: Hadoop Core
          Issue Type: Bug
            Reporter: Amar Kamat


This happens when we terminate the JT using _control-C_. It throws the following exception
{noformat}
Exception closing file my-file
java.io.IOException: Filesystem closed
        at org.apache.hadoop.hdfs.DFSClient.checkOpen(DFSClient.java:193)
        at org.apache.hadoop.hdfs.DFSClient.access$700(DFSClient.java:64)
        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.closeInternal(DFSClient.java:2868)
        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.close(DFSClient.java:2837)
        at org.apache.hadoop.hdfs.DFSClient$LeaseChecker.close(DFSClient.java:808)
        at org.apache.hadoop.hdfs.DFSClient.close(DFSClient.java:205)
        at org.apache.hadoop.hdfs.DistributedFileSystem.close(DistributedFileSystem.java:253)
        at org.apache.hadoop.fs.FileSystem$Cache.closeAll(FileSystem.java:1367)
        at org.apache.hadoop.fs.FileSystem.closeAll(FileSystem.java:234)
        at org.apache.hadoop.fs.FileSystem$ClientFinalizer.run(FileSystem.java:219)
{noformat}
Note that _my-file_ is some file used by the JT.

Also if there is some file renaming done, then the exception states that the earlier file does not exist. I am not sure if this is a MR issue or a DFS issue. Opening this issue for investigation.

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