Ben Lau created HBASE-19989:

             Summary: READY_TO_MERGE and READY_TO_SPLIT do not update region 
state correctly
                 Key: HBASE-19989
             Project: HBase
          Issue Type: Bug
    Affects Versions: 1.4.1, 1.3.1
            Reporter: Ben Lau
            Assignee: Ben Lau

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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