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Date: Fri, 20 May 2011 04:34:47 +0000 (UTC)
From: "Todd Lipcon (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Created] (HDFS-1969) Running rollback on new-version
 namenode destroys namespace
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Running rollback on new-version namenode destroys namespace
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                 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
            Priority: Blocker
             Fix For: 0.22.0


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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