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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1969) Running rollback on new-version namenode destroys namespace
Date Mon, 06 Jun 2011 11:23:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13044791#comment-13044791
] 

Hudson commented on HDFS-1969:
------------------------------

Integrated in Hadoop-Hdfs-22-branch #61 (See [https://builds.apache.org/hudson/job/Hadoop-Hdfs-22-branch/61/])
    HDFS-1969. Running rollback on new-version namenode destroys the namespace. Contributed
by Todd Lipcon.

todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1132527
Files : 
* /hadoop/hdfs/branches/branch-0.22/src/test/hdfs/org/apache/hadoop/hdfs/TestDFSRollback.java
* /hadoop/hdfs/branches/branch-0.22/src/java/org/apache/hadoop/hdfs/server/namenode/FSImage.java
* /hadoop/hdfs/branches/branch-0.22/CHANGES.txt


> Running rollback on new-version namenode destroys namespace
> -----------------------------------------------------------
>
>                 Key: HDFS-1969
>                 URL: https://issues.apache.org/jira/browse/HDFS-1969
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Blocker
>             Fix For: 0.22.0
>
>         Attachments: hdfs-1969.txt, hdfs-1969.txt, hdfs-1969.txt
>
>
> The following sequence leaves the namespace in an inconsistent/broken state:
> - format NN using 0.20 (or any prior release, probably)
> - run hdfs namenode -upgrade on 0.22. ^C the NN once it comes up.
> - run hdfs namenode -rollback on 0.22  (this should fail but doesn't!)
> This leaves the name directory in a state such that the version file claims it's an 0.20
namespace, but the fsimage is in 0.22 format. It then crashes when trying to start up.

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