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From "Jimmy Xiang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5360) [uberhbck] Add options for how to handle offline split parents.
Date Mon, 02 Jul 2012 16:37:23 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13405115#comment-13405115

Jimmy Xiang commented on HBASE-5360:

@Ram, good question. For lingering parent, the idea is to clear the split flag and let the
rest to be taken care by hbck, which will handle assignment too.  I considered to fix it in
one shot.  But it is some duplicate effort already in hbck.  It is much clean and safe to
use hbck to handle the assignment,
region overlaps, and so on.
> [uberhbck] Add options for how to handle offline split parents. 
> ----------------------------------------------------------------
>                 Key: HBASE-5360
>                 URL: https://issues.apache.org/jira/browse/HBASE-5360
>             Project: HBase
>          Issue Type: Improvement
>          Components: hbck
>    Affects Versions: 0.90.7, 0.92.1, 0.94.0
>            Reporter: Jonathan Hsieh
>            Assignee: Jimmy Xiang
>             Fix For: 0.90.7, 0.92.2, 0.96.0, 0.94.1
>         Attachments: 5360-0.90-hbase.patch, 5360-0.92-hbase.patch, 5360-0.94-hbase.patch,
5360_hbase_v4.patch, hbase-5360.path
> In a recent case, we attempted to repair a cluster that suffered from HBASE-4238 that
had about 6-7 generations of "leftover" split data.  The hbck repair options in an development
version of HBASE-5128 treat HDFS as ground truth but didn't check SPLIT and OFFLINE flags
only found in meta.  The net effect was that it essentially attempted to merge many regions
back into its eldest geneneration's parent's range.  
> More safe guards to prevent "mega-merges" are being added on HBASE-5128.
> This issue would automate the handling of the "mega-merge" avoiding cases such as "lingering
grandparents".  The strategy here would be to add more checks against .META., and perform
part of the catalog janitor's responsibilities for lingering grandparents.  This would potentially
include options to sideline regions, deleting grandparent regions, min size for sidelining,
and mechanisms for cleaning .META..  
> Note: There already exists an mechanism to reload these regions -- the bulk loaded mechanisms
in LoadIncrementalHFiles can be used to re-add grandparents (automatically splitting them
if necessary) to HBase.

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