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Date: Sat, 28 Jan 2012 20:38:10 +0000 (UTC)
From: "Hudson (Commented) (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (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:comment-tabpanel&focusedCommentId=13195620#comment-13195620 ] 

Hudson commented on HDFS-2759:
------------------------------

Integrated in Hadoop-Common-trunk-Commit #1613 (See [https://builds.apache.org/job/Hadoop-Common-trunk-Commit/1613/])
    HDFS-2759. Pre-allocate HDFS edit log files after writing version number. Contributed by Aaron T. Myers.

atm : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1237153
Files : 
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/EditLogFileOutputStream.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestEditLogFileOutputStream.java

                
> 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: 0.24.0
>
>         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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