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From "Todd Lipcon (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 Thu, 22 Nov 2012 00:12:58 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4173?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13502465#comment-13502465
] 

Todd Lipcon commented on HDFS-4173:
-----------------------------------

bq. The question of whether the SNN and NN will both try to auto-format the same (QJM-managed)
JournalNode quorum when starting up for the first time is more concerning

Right, sorry - that's what I meant by "shared edits dir", despite the fact that it's not in
fact a dir ;-)
                
> 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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