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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4173) If the NameNode has already been formatted, but a QuroumJournal has not, auto-format it on startup
Date Tue, 20 Jan 2015 21:02:38 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4173?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14284403#comment-14284403
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Colin Patrick McCabe commented on HDFS-4173:
--------------------------------------------

The NameNode no longer auto-formats edit log directories on the local filesystem.  So I think
we should close this as WONTFIX since the original reason for doing it (consistency with the
local edit log directories) no longer applies.

> 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, namenode
>    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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