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From "Matteo Bertozzi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9204) An Offline SplitParent Region can be assigned breaking split references
Date Tue, 13 Aug 2013 20:30:48 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13738784#comment-13738784
] 

Matteo Bertozzi commented on HBASE-9204:
----------------------------------------

{quote}Good point. I can add another check. During restore/clone a table, when will the table
is enabled/created?{quote}
clone and restore follow the same CreateTable code, with the difference that in this case
the list of HRegionInfo passed to the assignmentManager.assign() may contain some offline
split parent, so there're no znodes or other states around. 
                
> An Offline SplitParent Region can be assigned breaking split references
> -----------------------------------------------------------------------
>
>                 Key: HBASE-9204
>                 URL: https://issues.apache.org/jira/browse/HBASE-9204
>             Project: HBase
>          Issue Type: Bug
>          Components: Region Assignment
>    Affects Versions: 0.98.0, 0.95.1, 0.94.10
>            Reporter: Matteo Bertozzi
>            Assignee: Jimmy Xiang
>             Fix For: 0.98.0, 0.95.2, 0.94.11
>
>         Attachments: 0.94-9204.patch, HBASE-9294-0.94-v0.patch, trunk-9204.patch, trunk-9204_v2.patch
>
>
> An offline split parent region can be assigned by using 'assign' from shell.
> This may trigger a compaction on the split parent region that should be offline, breaking
the references of the two daughters.
> The easy way to test this is:
>  * disable compactions
>  * create a table and insert some row
>  * split
>  * shutdown the master (otherwise there's a state checked inside the AssignmentManager)
>  * start the master
>  * assign the region marked as OFFLINE => true, SPLIT => true (the compaction on
region startup will probably break the reference of the two  daughters)

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