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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3695) Genericize format() and initializeSharedEdits() to non-file JournalManagers
Date Fri, 20 Jul 2012 01:13:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3695?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13418855#comment-13418855
] 

Todd Lipcon commented on HDFS-3695:
-----------------------------------

I'm initially targeting the QJM branch here, but this is generally useful for other journal
managers as well (eg the BKJM implementation may want to create some entries in ZooKeeper,
or remove a previous journal when reformatting a namenode).
                
> Genericize format() and initializeSharedEdits() to non-file JournalManagers
> ---------------------------------------------------------------------------
>
>                 Key: HDFS-3695
>                 URL: https://issues.apache.org/jira/browse/HDFS-3695
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha, name-node
>    Affects Versions: QuorumJournalManager (HDFS-3077)
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>
> Currently, the "namenode -format" and "namenode -initializeSharedEdits" commands do not
understand how to do anything with non-file-based shared storage. This affects both BookKeeperJournalManager
and QuorumJournalManager.
> This JIRA is to plumb through the formatting of edits directories using pluggable journal
manager implementations so that no separate step needs to be taken to format them -- the same
commands will work for NFS-based storage or one of the alternate implementations.

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