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https://issues.apache.org/jira/browse/HBASE-20651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16524605#comment-16524605
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huaxiang sun commented on HBASE-20651:
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The issue is that hbck sends a offline command to offline a split parent
region, which will change region's in-memory state from SPLIT to OFFLINE, and a
following assign() will succeed and bring back the SPLIT parent region to life.
I added a simple check, though it wont address the issue totally (due to no
lock protection to change region's in-memory state), the sanity check will
filter out most of corner cases (hopefully)
> Master, prevents hbck or shell command to reassign the split parent region
> --------------------------------------------------------------------------
>
> Key: HBASE-20651
> URL: https://issues.apache.org/jira/browse/HBASE-20651
> Project: HBase
> Issue Type: Improvement
> Components: master
> Affects Versions: 1.2.6
> Reporter: huaxiang sun
> Assignee: huaxiang sun
> Priority: Minor
> Attachments: HBASE-20651-branch-1-v001.patch
>
>
> We are seeing that hbck brings back split parent region and this causes
> region inconsistency. More details will be filled as reproduce is still
> ongoing. Might need to do something at hbck or master to prevent this from
> happening.
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