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Posted to hdfs-issues@hadoop.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2012/05/16 07:56:19 UTC

[jira] [Updated] (HDFS-2759) Pre-allocate HDFS edit log files after writing version number

     [ https://issues.apache.org/jira/browse/HDFS-2759?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Lipcon updated HDFS-2759:
------------------------------

    Fix Version/s:     (was: 2.0.0)
                   2.0.1
    
> Pre-allocate HDFS edit log files after writing version number
> -------------------------------------------------------------
>
>                 Key: HDFS-2759
>                 URL: https://issues.apache.org/jira/browse/HDFS-2759
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: ha, name-node
>    Affects Versions: 0.24.0
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>             Fix For: 2.0.1
>
>         Attachments: HDFS-2759.patch, HDFS-2759.patch, HDFS-2759.patch
>
>
> In HDFS-2709 it was discovered that there's a potential race wherein edits log files are pre-allocated before the version number is written into the header of the file. This can cause the NameNode to read an invalid HDFS layout version, and hence fail to read the edit log file. We should write the header, then pre-allocate the rest of the file after this point.

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