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From "Jitendra Nath Pandey (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-2915) HA: TestFailureOfSharedDir.testFailureOfSharedDir() has race condition
Date Thu, 09 Feb 2012 21:10:57 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2915?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jitendra Nath Pandey resolved HDFS-2915.
----------------------------------------

       Resolution: Fixed
    Fix Version/s: HA branch (HDFS-1623)
     Hadoop Flags: Reviewed

Committed. Thanks to Bikas!
                
> HA: TestFailureOfSharedDir.testFailureOfSharedDir() has race condition
> ----------------------------------------------------------------------
>
>                 Key: HDFS-2915
>                 URL: https://issues.apache.org/jira/browse/HDFS-2915
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Bikas Saha
>            Assignee: Bikas Saha
>            Priority: Minor
>             Fix For: HA branch (HDFS-1623)
>
>         Attachments: HDFS-2915.HDFS-1623.patch, HDFS-2915.HDFS-1623.patch
>
>
> The test deletes the shared edits dir to simulate a failure. Then it calls rollEditLogs()
to trigger the deleted dir to be used and fail with an IOException. Unfortunately, deleting
the shared dir can put the NN in safe mode due to lack of space. This causes a SafeModeException
to be thrown when rollEditDirs() is called. This exception is caught as an IOException in
the test but the associated assert in the catch block fails.
> This always happens in the debugger because the delay in stepping through causes the
safe mode change to happen before rollEditLogs() gets called.

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