[jira] [Created] (HBASE-7923) force unassign can confirm region online on any RS to get rid of double assignments.

["rajeshbabu (JIRA)" <ji...@apache.org>]

rajeshbabu created HBASE-7923:
---------------------------------

             Summary: force unassign can confirm region online on any RS to get rid of double assignments.
                 Key: HBASE-7923
                 URL: https://issues.apache.org/jira/browse/HBASE-7923
             Project: HBase
          Issue Type: Improvement
            Reporter: rajeshbabu
            Assignee: rajeshbabu
             Fix For: 0.96.0


Presently in force unassign we are offlining a region from AM and reassigning it, which may cause double assignments.
{code}
        this.assignmentManager.regionOffline(hri);
        assignRegion(hri);
{code}

Any way if a region is not served by any RS we are offlining the region from AM. 
{code}
       if (t instanceof NotServingRegionException) {
          if (transitionInZK) {
            deleteClosingOrClosedNode(region);
          }
          regionOffline(region);
          return;
        } 
{code}

We can change as below just to confirm whether region online on any RS.

{code}
this.assignmentManager.unassign(hri,force);
if(!this.assignmentManager.getRegionStates().isRegionInTransition(hri) && !this.assignmentManager.getRegionStates().isRegionAssigned(hri) ){
	assignRegion(hri);
}
{code}



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