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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2281) NPE in checkpoint during processIOError()
Date Tue, 30 Aug 2011 08:04:37 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13093533#comment-13093533
] 

Konstantin Shvachko commented on HDFS-2281:
-------------------------------------------

Hey Uma. It looks good to me. Could you pls run and post the results of test and test-patch
here.

> 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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