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Posted to issues@hbase.apache.org by "Umesh Kumar Kumawat (Jira)" <ji...@apache.org> on 2026/05/13 12:11:00 UTC

[jira] [Commented] (HBASE-29692) Prevent merged region from assigning again

    [ https://issues.apache.org/jira/browse/HBASE-29692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18080574#comment-18080574 ] 

Umesh Kumar Kumawat commented on HBASE-29692:
---------------------------------------------

Hi [~cgoyal]  did you made any progress here ? 

> 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
>            Assignee: chirag goyal
>            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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