org.apache.hadoop.mapreduce.security

Class TokenCache

java.lang.Object

org.apache.hadoop.mapreduce.security.TokenCache

@InterfaceAudience.Public
@InterfaceStability.Evolving
public class TokenCache
extends Object

This class provides user facing APIs for transferring secrets from the job client to the tasks. The secrets can be stored just before submission of jobs and read during the task execution.

Constructor Summary

Constructors

Constructor and Description
TokenCache()

Method Summary

Methods

Modifier and Type	Method and Description
static void	cleanUpTokenReferral(Configuration conf) Remove jobtoken referrals which don't make sense in the context of the task execution.
static byte[]	getSecretKey(org.apache.hadoop.security.Credentials credentials, Text alias) auxiliary method to get user's secret keys..
static void	obtainTokensForNamenodes(org.apache.hadoop.security.Credentials credentials, Path[] ps, Configuration conf) Convenience method to obtain delegation tokens from namenodes corresponding to the paths passed.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TokenCache

public TokenCache()

Method Detail

getSecretKey

public static byte[] getSecretKey(org.apache.hadoop.security.Credentials credentials,
                  Text alias)

auxiliary method to get user's secret keys..

Parameters:

alias -

Returns:

secret key from the storage

obtainTokensForNamenodes

public static void obtainTokensForNamenodes(org.apache.hadoop.security.Credentials credentials,
                            Path[] ps,
                            Configuration conf)
                                     throws IOException

Convenience method to obtain delegation tokens from namenodes corresponding to the paths passed.

Parameters:

credentials -

ps - array of paths

conf - configuration

Throws:

IOException

cleanUpTokenReferral

public static void cleanUpTokenReferral(Configuration conf)

Remove jobtoken referrals which don't make sense in the context of the task execution.

Parameters:

conf -