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https://issues.apache.org/jira/browse/HBASE-29692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18039593#comment-18039593
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chirag goyal commented on HBASE-29692:
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I’d like to start contributing to this issue. Could you let me know the latest
status or if there are any blockers I should be aware of? Thanks!
> Prevent merged region from assigning again
> ------------------------------------------
>
> Key: HBASE-29692
> URL: https://issues.apache.org/jira/browse/HBASE-29692
> Project: HBase
> Issue Type: Bug
> Components: Region Assignment
> Affects Versions: 2.6.0
> Reporter: Umesh Kumar Kumawat
> Priority: Minor
>
> Once a region is split/merged, one should not be able to assign it using
> hbck. Generally it is not possible becuase as soon as we create the merged
> region we delete the reiogn but in a race condition It is possible if one
> request an assign command just before deleting it.
> There is a Unit test
> ([TestRegionMergeTransactionOnCluster#testWholesomeMerge|https://github.com/apache/hbase/blob/a47fa6a448ff08020fb2f5cfb238a911dfae4c81/hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestRegionMergeTransactionOnCluster.java#L170-L176])
> as well for this case but assertion for that JUnit are not good, UnitTest is
> only checking if region was in transition. Assign/Unassin is quickly able to
> complete so most of the time we are able to pass the Unit test.
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