private void removeNonDefaultReplicas(MasterProcedureEnv env) throws IOException {
    AssignmentManagerUtil.removeNonDefaultReplicas(env, Stream.of(getParentRegion()),
      getRegionReplication(env));
  }
Calculate daughter regionid to use.
@param hri Parent {@link RegionInfo}
@return Daughter region id (timestamp) to use.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/SplitTableRegionProcedure.java