@Override
  protected void updateTransitionWithoutPersistingToMeta(MasterProcedureEnv env,
    RegionStateNode regionNode, TransitionCode transitionCode, long seqId) throws IOException {
    assert transitionCode == TransitionCode.CLOSED;
    env.getAssignmentManager().regionClosedWithoutPersistingToMeta(regionNode);
  }
The remote procedure used to close a region.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/CloseRegionProcedure.java