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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3998) Got an exception from ClientFinalizer when the JT is terminated
Date Tue, 24 Feb 2009 01:16:01 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3998?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

dhruba borthakur updated HADOOP-3998:
-------------------------------------

    Attachment: closeAll.patch

The fix is to close the leaseRenewal thread before shutting down the client. Otherwise the
lease renewal thread invokes close() on all the open file descriptors, then the close() method
throws an exception beucase clientRunning  was already set to false. Also, fixing the above
bug exposed the case when the client does not exit if all datanode(s) in the pipeline are
bad.

> Got an exception from ClientFinalizer when the JT is terminated
> ---------------------------------------------------------------
>
>                 Key: HADOOP-3998
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3998
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.19.0
>            Reporter: Amar Kamat
>            Assignee: dhruba borthakur
>             Fix For: 0.19.2
>
>         Attachments: closeAll.patch, closeAll.patch
>
>
> 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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