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https://issues.apache.org/jira/browse/HBASE-9204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13738429#comment-13738429
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Jimmy Xiang commented on HBASE-9204:
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[~ram_krish], the code you referred to have been removed from trunk since meta
update is an atomic operation now (row mutations). During master failover, the
region should be ignored since it is a split parent. However, manual assign is
not blocked. That's why I propose to put the region in split mode when master
starts/restarts, so that it won't be allowed to assign.
> 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
> Priority: Blocker
> Attachments: HBASE-9294-0.94-v0.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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