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From "Fred Emmott (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2526) Fixup script that scans .META., report holes if any and then finds dropped regions in fs if they are present (loading them if asked)
Date Fri, 16 Jul 2010 22:17:51 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2526?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12889360#action_12889360
] 

Fred Emmott commented on HBASE-2526:
------------------------------------

A couple of points:
 - after this runs, the region it inserts appears as the last region for the table. The other
regions appeared again after ~ 20 seconds
 - it assumes that the keys for the table are valid character strings, not arbitrary byte
arrays

> Fixup script that scans .META., report holes if any and then finds dropped regions in
fs if they are present (loading them if asked) 
> -------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-2526
>                 URL: https://issues.apache.org/jira/browse/HBASE-2526
>             Project: HBase
>          Issue Type: Task
>          Components: scripts
>            Reporter: stack
>         Attachments: fix_missing_regions.rb
>
>
> I was just at a site that was getting a WRE.  Looking at meta, was plain that a region
was missing from .META.  The install was 0.20.3 (0.20.4 should fix the issue seen but...).
 Getting things back online involved digging in logs to find info on missing region, what
its encoded name was, and then doing a hack version of add_table.rb to add back the dropped
region.
> A script that could spin through meta could easily find holes.  That'd be a help.  Subsequent,
the script could go looking in fs for the missing region.  If present, it could even add back
the missing region.  This is subtask of hbase-7.

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