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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2281) NPE in checkpoint during processIOError()
Date Fri, 26 Aug 2011 17:53:29 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13091904#comment-13091904
] 

Hadoop QA commented on HDFS-2281:
---------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12491816/HDFS-2281.patch
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    -1 patch.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/1162//console

This message is automatically generated.

> 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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