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From "Uma Maheswara Rao G (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2281) NPE in checkpoint during processIOError()
Date Fri, 26 Aug 2011 17:51:29 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2281?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Uma Maheswara Rao G updated HDFS-2281:
--------------------------------------

    Status: Patch Available  (was: Open)

Also handled the IOExceptions in SetCheckpointTime in FSImage Storage.
When i investigate this bug, i found that this issue fixed in trunk already. So, above point
back ported from trunk.

Konstantin, can you just have a look?

> NPE in checkpoint during processIOError()
> -----------------------------------------
>
>                 Key: HDFS-2281
>                 URL: https://issues.apache.org/jira/browse/HDFS-2281
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.22.0
>            Reporter: Konstantin Shvachko
>            Assignee: Uma Maheswara Rao G
>             Fix For: 0.22.0
>
>         Attachments: BN-bug-NPE.txt, HDFS-2281.patch
>
>
> At the end of checkpoint BackupNode tries to convergeJournalSpool() and calls revertFileStreams().
The latter closes each file stream, and tries to rename the corresponding file to its permanent
location current/edits. If for any reason the rename fails processIOError() is called for
failed streams. processIOError() will try to close the stream again and will get NPE in EditLogFileOutputStream.close()
because bufCurrent was set to null by the previous close.

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