@Override
  public String toString() {
    return "StartMiniClusterOption{" + "numMasters=" + numMasters + ", numRegionServers="
      + numRegionServers + ", rsPorts=" + StringUtils.join(rsPorts) + ", numDataNodes="
      + numDataNodes + ", dataNodeHosts=" + Arrays.toString(dataNodeHosts) + ", numZkServers="
      + numZkServers + ", createRootDir=" + createRootDir + ", createWALDir=" + createWALDir + '}';
  }
Private constructor. Use {@link Builder#build()}.
hbase-testing-util/src/main/java/org/apache/hadoop/hbase/testing/TestingHBaseClusterOption.java