pulsar-io/hdfs2/src/main/java/org/apache/pulsar/io/hdfs2/SecurityUtil.java [31:89]:
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public class SecurityUtil {
    public static final String HADOOP_SECURITY_AUTHENTICATION = "hadoop.security.authentication";
    public static final String KERBEROS = "kerberos";

    /**
     *  Initializes UserGroupInformation with the given Configuration and performs the login for the
     *  given principal and keytab. All logins should happen through this class to ensure other threads
     *  are not concurrently modifying UserGroupInformation.
     * <p/>
     * @param config the configuration instance
     * @param principal the principal to authenticate as
     * @param keyTab the keytab to authenticate with
     *
     * @return the UGI for the given principal
     *
     * @throws IOException if login failed
     */
    public static synchronized UserGroupInformation loginKerberos(final Configuration config,
            final String principal, final String keyTab) throws IOException {
        Validate.notNull(config);
        Validate.notNull(principal);
        Validate.notNull(keyTab);

        UserGroupInformation.setConfiguration(config);
        UserGroupInformation.loginUserFromKeytab(principal.trim(), keyTab.trim());
        return UserGroupInformation.getCurrentUser();
    }

    /**
     * Initializes UserGroupInformation with the given Configuration and
     * returns UserGroupInformation.getLoginUser(). All logins should happen
     * through this class to ensure other threads are not concurrently
     * modifying UserGroupInformation.
     *
     * @param config the configuration instance
     *
     * @return the UGI for the given principal
     *
     * @throws IOException if login failed
     */
    public static synchronized UserGroupInformation loginSimple(final Configuration config) throws IOException {
        Validate.notNull(config);
        UserGroupInformation.setConfiguration(config);
        return UserGroupInformation.getLoginUser();
    }

    /**
     * Initializes UserGroupInformation with the given Configuration and returns
     * UserGroupInformation.isSecurityEnabled().
     * All checks for isSecurityEnabled() should happen through this method.
     *
     * @param config the given configuration
     *
     * @return true if kerberos is enabled on the given configuration, false otherwise
     *
     */
    public static boolean isSecurityEnabled(final Configuration config) {
        Validate.notNull(config);
        return KERBEROS.equalsIgnoreCase(config.get(HADOOP_SECURITY_AUTHENTICATION));
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pulsar-io/hdfs3/src/main/java/org/apache/pulsar/io/hdfs3/SecurityUtil.java [31:89]:
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public class SecurityUtil {
    public static final String HADOOP_SECURITY_AUTHENTICATION = "hadoop.security.authentication";
    public static final String KERBEROS = "kerberos";

    /**
     *  Initializes UserGroupInformation with the given Configuration and performs the login for the
     *  given principal and keytab. All logins should happen through this class to ensure other threads
     *  are not concurrently modifying UserGroupInformation.
     * <p/>
     * @param config the configuration instance
     * @param principal the principal to authenticate as
     * @param keyTab the keytab to authenticate with
     *
     * @return the UGI for the given principal
     *
     * @throws IOException if login failed
     */
    public static synchronized UserGroupInformation loginKerberos(final Configuration config,
            final String principal, final String keyTab) throws IOException {
        Validate.notNull(config);
        Validate.notNull(principal);
        Validate.notNull(keyTab);

        UserGroupInformation.setConfiguration(config);
        UserGroupInformation.loginUserFromKeytab(principal.trim(), keyTab.trim());
        return UserGroupInformation.getCurrentUser();
    }

    /**
     * Initializes UserGroupInformation with the given Configuration and
     * returns UserGroupInformation.getLoginUser(). All logins should happen
     * through this class to ensure other threads are not concurrently
     * modifying UserGroupInformation.
     *
     * @param config the configuration instance
     *
     * @return the UGI for the given principal
     *
     * @throws IOException if login failed
     */
    public static synchronized UserGroupInformation loginSimple(final Configuration config) throws IOException {
        Validate.notNull(config);
        UserGroupInformation.setConfiguration(config);
        return UserGroupInformation.getLoginUser();
    }

    /**
     * Initializes UserGroupInformation with the given Configuration and returns
     * UserGroupInformation.isSecurityEnabled().
     * All checks for isSecurityEnabled() should happen through this method.
     *
     * @param config the given configuration
     *
     * @return true if kerberos is enabled on the given configuration, false otherwise
     *
     */
    public static boolean isSecurityEnabled(final Configuration config) {
        Validate.notNull(config);
        return KERBEROS.equalsIgnoreCase(config.get(HADOOP_SECURITY_AUTHENTICATION));
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