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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 Thu, 29 Sep 2011 07:48:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13117095#comment-13117095
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Jonathan Hsieh commented on HBASE-4377:
---------------------------------------

I'm having a hard time with tests that restart the test hbase mini cluster.  I start cluster,
modify meta/hdfs regions, shutdown cluster, rebuild meta, and then get an NPE when restarting.


Specifically, this method sometimes returns null which later causes an NPE when constructor
calls 

{code}
User.HadoopUser.<init>
  ugi = (UserGroupInformation) callStatic("getCurrentUGI");
{code}

Test were passing at one point but I can't seem to figure out a direct cause for why this
would fail.  Any hints?  
                
> [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
>
> 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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