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From nielsbasjes <...@git.apache.org>
Subject [GitHub] flink pull request: [FLINK-2977] Added support for accessing a Ker...
Date Fri, 13 Nov 2015 10:04:31 GMT
Github user nielsbasjes commented on a diff in the pull request:

    https://github.com/apache/flink/pull/1342#discussion_r44766715
  
    --- Diff: flink-yarn/src/main/java/org/apache/flink/yarn/Utils.java ---
    @@ -135,7 +138,54 @@ public static void setTokensFor(ContainerLaunchContext amContainer,
Path[] paths
     		ByteBuffer securityTokens = ByteBuffer.wrap(dob.getData(), 0, dob.getLength());
     		amContainer.setTokens(securityTokens);
     	}
    -	
    +
    +	/**
    +	 * Obtain Kerberos security token for HBase.
    +	 */
    +	private static void obtainTokenForHBase(Credentials credentials, Configuration conf)
throws IOException {
    +		if (UserGroupInformation.isSecurityEnabled()) {
    +			LOG.info("Attempting to obtain Kerberos security token for HBase");
    +			try {
    +				// ----
    +				// Intended call: HBaseConfiguration.addHbaseResources(conf);
    +				Class
    +						.forName("org.apache.hadoop.hbase.HBaseConfiguration")
    +						.getMethod("addHbaseResources", Configuration.class )
    +						.invoke(null, conf);
    +				// ----
    +
    +				LOG.info("HBase security setting: {}", conf.get("hbase.security.authentication"));
    +
    +				if (!"kerberos".equals(conf.get("hbase.security.authentication"))) {
    +					LOG.info("HBase has not been configured to use Kerberos.");
    +					return;
    +				}
    +
    +				LOG.info("Obtaining Kerberos security token for HBase");
    +				// ----
    +				// Intended call: Token<AuthenticationTokenIdentifier> token = TokenUtil.obtainToken(conf);
    +				Token<?> token = (Token<?>) Class
    +						.forName("org.apache.hadoop.hbase.security.token.TokenUtil")
    +						.getMethod("obtainToken", Configuration.class)
    +						.invoke(null, conf);
    +				// ----
    +
    +				if (token == null) {
    +					LOG.error("No Kerberos security token for HBase available");
    +					return;
    +				}
    +
    +				credentials.addToken(token.getService(), token);
    +				LOG.info("Added HBase Kerberos security token to credentials.");
    +			} catch ( ClassNotFoundException
    +					| NoSuchMethodException
    +					| IllegalAccessException
    +					| InvocationTargetException e) {
    +				LOG.info("HBase is not available (not packaged with this application).");
    --- End diff --
    
    Now the error looks like this (not the full stacktrace, yet enough to understand what
happened):
    ```
    11:01:49,970 INFO  org.apache.flink.yarn.Utils  - HBase is not available (not packaged
with this application): ClassNotFoundException : "org.apache.hadoop.hbase.HBaseConfiguration".
    ```


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