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From "Aaron T. Myers (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2759) Pre-allocate HDFS edit log files after writing version number
Date Tue, 24 Jan 2012 08:16:40 GMT

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

Aaron T. Myers updated HDFS-2759:
---------------------------------

    Component/s: ha
    
> 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: Sub-task
>          Components: ha, name-node
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>
> 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 standby to read an invalid version. We should write the header, then pre-allocate
the rest of the file after this point.

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