@SuppressWarnings("unchecked")
  private static Class<? extends HMaster> getMasterImplementation(final Configuration conf) {
    return (Class<? extends HMaster>) conf.getClass(HConstants.MASTER_IMPL, HMaster.class);
  }
Constructor.
@param conf            Configuration to use. Post construction has the active master address.
@param noMasters       Count of masters to start.
@param noRegionServers Count of regionservers to start.
hbase-server/src/main/java/org/apache/hadoop/hbase/LocalHBaseCluster.java