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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4173) If the NameNode has already been formatted, but a QuroumJournal has not, auto-format it on startup
Date Sat, 10 Nov 2012 02:01:13 GMT
Colin Patrick McCabe created HDFS-4173:
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             Summary: If the NameNode has already been formatted, but a QuroumJournal has
not, auto-format it on startup
                 Key: HDFS-4173
                 URL: https://issues.apache.org/jira/browse/HDFS-4173
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: journal-node, name-node
    Affects Versions: 2.0.3-alpha
            Reporter: Colin Patrick McCabe
            Assignee: Colin Patrick McCabe
            Priority: Minor
         Attachments: HDFS-4173.001.patch

If we have multiple edit log directories, and some of them are formatted, but others are not,
we format the unformatted ones.  However, when we implemented QuorumJournalManager, we did
not extend this behavior to it.  It makes sense to do this.

One use case is if you want to add a QuorumJournalManager URI ({{journal://}}) to an existing
{{NameNode}}, without reformatting everything.  There is currently no easy way to do this,
since {{namenode \-format}} will nuke everything, and there's no other way to format the {{JournalNodes}}.

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