Duo Zhang commented on HBASE-20881:

Another problem is SplitTableRegionProcedure and MergeTableRegionProcedure, as 
they will also hold the exclusive lock for the regions, but can not be 
interrupted by SCP.

> Introduce a region transition procedure to handle all the state transition 
> for a region
> ---------------------------------------------------------------------------------------
>                 Key: HBASE-20881
>                 URL: https://issues.apache.org/jira/browse/HBASE-20881
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Duo Zhang
>            Priority: Major
> Now have an AssignProcedure, an UnssignProcedure, and also a 
> MoveRegionProcedure which schedules an AssignProcedure and an 
> UnssignProcedure to move a region. This makes the logic a bit complicated, as 
> MRP is not a RIT, so when SCP can not interrupt it directly...

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