compact_rs not support hostname,port

public static ServerName valueOf(final String serverName) {
  int firstSep = serverName.indexOf(SERVERNAME_SEPARATOR);
  int lastSep = serverName.lastIndexOf(SERVERNAME_SEPARATOR);
  String hostname = serverName.substring(0, firstSep);
  int port = Integer.parseInt(serverName.substring(firstSep + 1, lastSep));
  long startCode = Long.parseLong(serverName.substring(lastSep + 1));
  return valueOf(hostname, port, startCode);
}