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https://issues.apache.org/jira/browse/HBASE-19989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16362878#comment-16362878
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Francis Liu commented on HBASE-19989:
-------------------------------------

[~yuzhih...@gmail.com] This is a bug in zkless assignment there used to be 
tests but they were removed. We'll include the zkless split tests in this 
patch. We've already been running the tests and this patch in prod. We'll work 
on adding back the rest of the zkless tests as part of HBASE-14626.

> READY_TO_MERGE and READY_TO_SPLIT do not update region state correctly
> ----------------------------------------------------------------------
>
>                 Key: HBASE-19989
>                 URL: https://issues.apache.org/jira/browse/HBASE-19989
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 1.3.1, 1.4.1
>            Reporter: Ben Lau
>            Assignee: Ben Lau
>            Priority: Major
>         Attachments: HBASE-19989.patch
>
>
> Region state transitions do not work correctly for READY_TO_MERGE/SPLIT.  
> [~thiruvel] and I noticed this is due to break statements being in the wrong 
> place in AssignmentManager.  This allows a race condition for example in 
> which one of the regions being merged could be moved concurrently, resulting 
> in the merge transaction failing and then double assignment and/or dataloss.  
> This bug appears to only affect branch-1 (for example 1.3 and 1.4) and not 
> branch-2 as the relevant code in AM has since been rewritten.



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