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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5159) Secondary NameNode fails to checkpoint if error occurs downloading edits on first checkpoint
Date Fri, 06 Sep 2013 10:57:52 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13760120#comment-13760120
] 

Hudson commented on HDFS-5159:
------------------------------

SUCCESS: Integrated in Hadoop-Yarn-trunk #324 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/324/])
HDFS-5159. Secondary NameNode fails to checkpoint if error occurs downloading edits on first
checkpoint. Contributed by Aaron T. Myers. (atm: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1520363)
* /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/SecondaryNameNode.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestCheckpoint.java

                
> Secondary NameNode fails to checkpoint if error occurs downloading edits on first checkpoint
> --------------------------------------------------------------------------------------------
>
>                 Key: HDFS-5159
>                 URL: https://issues.apache.org/jira/browse/HDFS-5159
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.1.0-beta
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>             Fix For: 2.1.1-beta
>
>         Attachments: HDFS-5159.patch, HDFS-5159.patch
>
>
> The 2NN will avoid downloading/loading a new fsimage if its local copy of fsimage is
the same as the version on the NN. However, the decision to *load* the fsimage from disk into
memory is based only on the on-disk fsimage version. If an error occurs between downloading
and loading the fsimage on the first checkpoint attempt, the 2NN will never load the fsimage,
and then on subsequent checkpoint attempts it will not load the on-disk fsimage and thus will
never checkpoint successfully.
> Example error message in the first comment of this ticket.

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