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From "Jonathan Hsieh (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4377) [hbck] Offline rebuild .META. from fs data only.
Date Tue, 04 Oct 2011 22:56:33 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13120561#comment-13120561
] 

Jonathan Hsieh commented on HBASE-4377:
---------------------------------------

Although I've gotten this to work with live systems, it seems like that there are some problems
with the testing on the backports.  Different versions have different expected values which
does not seem to make sense.  HBASE-3777 changed some of the semantics of the HBaseTestingUtility
so I'll be investigating more.
                
> [hbck] Offline rebuild .META. from fs data only.
> ------------------------------------------------
>
>                 Key: HBASE-4377
>                 URL: https://issues.apache.org/jira/browse/HBASE-4377
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Jonathan Hsieh
>            Assignee: Jonathan Hsieh
>         Attachments: 0001-HBASE-4377-hbck-Offline-rebuild-.META.-from-fs-data-.patch,
hbase-4377-trunk.v2.patch
>
>
> In a worst case situation, it may be helpful to have an offline .META. rebuilder that
just looks at the file system's .regioninfos and rebuilds meta from scratch.  Users could
move bad regions out until there is a clean rebuild.  
> It would likely fill in region split holes.  Follow on work could given options to merge
or select regions that overlap, or do online rebuilds.

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