public static String getMajorVersion() {    String vers = VersionInfo.getVersion();    String[] parts = vers.split("\\.");    if (parts.length < 2) {      throw new RuntimeException("Illegal Hadoop Version: " + vers +          " (expected A.B.* format)");    }    String majorVersion = parts[0] + "." + parts[1];    // If we are running a security release, we won‘t have UnixUserGroupInformation    // (removed by HADOOP-6299 when switching to JAAS for Login)    try {      Class.forName("org.apache.hadoop.security.UnixUserGroupInformation");    } catch (ClassNotFoundException cnf) {      if ("0.20".equals(majorVersion)) {        majorVersion += "S";      }    }    return majorVersion;  }