private static String getMyAddress() {
    try {
      return DNS.getDefaultHost("default", "default");
    } catch (UnknownHostException uhe) {
      LOG.error("cannot determine my address", uhe);
      return null;
    }
  }
Create a row before the specified row and very close to the specified row.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/ConnectionUtils.java