@Override
  protected GCMergedRegionsState getState(int stateId) {
    return GCMergedRegionsState.forNumber(stateId);
  }
GC regions that have been Merged. Caller determines if it is GC time. This Procedure does not
check.
<p>
This is a Table Procedure. We take a read lock on the Table. We do NOT keep a lock for the life
of this procedure. The subprocedures take locks on the Regions they are purging.
@deprecated 2.3.0 Use {@link GCMultipleMergedRegionsProcedure}.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/GCMergedRegionsProcedure.java