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Date: Thu, 26 Jan 2012 00:04:39 +0000 (UTC)
From: "Aaron T. Myers (Updated) (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Updated] (HDFS-2759) Pre-allocate HDFS edit log files after
 writing version number
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     [ https://issues.apache.org/jira/browse/HDFS-2759?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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

    Issue Type: Bug  (was: Sub-task)
        Parent:     (was: HDFS-1623)
    
> 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: 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 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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