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https://issues.apache.org/jira/browse/HDFS-2759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13195622#comment-13195622
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Hudson commented on HDFS-2759:
------------------------------
Integrated in Hadoop-Hdfs-trunk-Commit #1685 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk-Commit/1685/])
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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