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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2281) NPE in checkpoint during processIOError()
Date Wed, 24 Aug 2011 01:27:29 GMT

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

Konstantin Shvachko updated HDFS-2281:
--------------------------------------

    Attachment: BN-bug-NPE.txt

> 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
>             Fix For: 0.22.0
>
>         Attachments: BN-bug-NPE.txt
>
>
> 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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