private void init(MasterProcedureEnv env) {
      RegionStateNode regionNode =
        env.getAssignmentManager().getRegionStates().getOrCreateRegionStateNode(getRegion());
      regionNode.setProcedure(this);
    }
An AssignProcedure that Stalls just before the finish.
hbase-server/src/test/java/org/apache/hadoop/hbase/master/assignment/TestRegionBypass.java