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