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https://issues.apache.org/jira/browse/HBASE-4377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13145197#comment-13145197
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Jonathan Hsieh commented on HBASE-4377:
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@mingjian
If there was a split that didn't complete cleanly, a parent region with
daughters should look like an overlap. The tool will tell you where these
overlaps are.
One way to fix the problem is to keep the parent region and then move or remove
the daughter regions from hdfs. Since it is in the middle of a split, the
parent should have all the data. Alternately, you could copy the store files
from the daughters into the dir of the parent and then run the offline
rebuilder.
I plan on writing a blog post and hopefully adding to the book on how to fix
these problems.
> [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
> Affects Versions: 0.92.0
> Reporter: Jonathan Hsieh
> Assignee: Jonathan Hsieh
> Attachments:
> 0001-HBASE-4377-hbck-Offline-rebuild-.META.-from-fs-data-.0.90-v4.patch,
> 0001-HBASE-4377-hbck-Offline-rebuild-.META.-from-fs-data-.0.90.v3.patch,
> 0001-HBASE-4377-hbck-Offline-rebuild-.META.-from-fs-data-.patch,
> 0001-HBASE-4377-hbck-Offline-rebuild-.META.-from-fs-data-.trunk.v3.patch,
> 0001-HBASE-4377-hbck-Offline-rebuild-.META.-from-fs-data.0.92.v1.patch,
> 0001-HBASE-4377-hbck-Offline-rebuild-.META.-from-fs-data.0.92.v2.patch,
> EXT_AC.regioninfo, EXT_ATU_05f84d32cbc0bdabf00e00bc2f3570f0.regioninfo,
> hbase-4377-trunk.v2.patch, hbase-4377.0.90.v6.patch, hbase-4377.trunk.v3.txt,
> hbase-4377.trunk.v4.txt, hbase-4377.trunk.v5.txt, hbase-4377.trunk.v6.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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