Package org.apache.hadoop.hdfs

Class HdfsDtFetcher

java.lang.Object

org.apache.hadoop.hdfs.HdfsDtFetcher

All Implemented Interfaces:

org.apache.hadoop.security.token.DtFetcher

Direct Known Subclasses:

SWebHdfsDtFetcher, WebHdfsDtFetcher

public class HdfsDtFetcher
extends Object
implements org.apache.hadoop.security.token.DtFetcher

DtFetcher is an interface which permits the abstraction and separation of delegation token fetch implementaions across different packages and compilation units. Resolution of fetcher impl will be done at runtime.

Constructor Summary

Constructors

Constructor	Description
HdfsDtFetcher()

Method Summary

Modifier and Type	Method	Description
org.apache.hadoop.security.token.Token<?>	addDelegationTokens(org.apache.hadoop.conf.Configuration conf, org.apache.hadoop.security.Credentials creds, String renewer, String url)	Returns Token object via FileSystem, null if bad argument.
org.apache.hadoop.io.Text	getServiceName()	Returns the service name for HDFS, which is also a valid URL prefix.
boolean	isTokenRequired()

Methods inherited from class java.lang.Object

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

Constructor Details

HdfsDtFetcher

public HdfsDtFetcher()

Method Details

getServiceName

public org.apache.hadoop.io.Text getServiceName()

Returns the service name for HDFS, which is also a valid URL prefix.

Specified by:

getServiceName in interface org.apache.hadoop.security.token.DtFetcher

isTokenRequired

public boolean isTokenRequired()

Specified by:

isTokenRequired in interface org.apache.hadoop.security.token.DtFetcher

addDelegationTokens

public org.apache.hadoop.security.token.Token<?> addDelegationTokens(org.apache.hadoop.conf.Configuration conf,
 org.apache.hadoop.security.Credentials creds,
 String renewer,
 String url)
                                                              throws Exception

Returns Token object via FileSystem, null if bad argument.

Specified by:

addDelegationTokens in interface org.apache.hadoop.security.token.DtFetcher

Parameters:

conf - - a Configuration object used with FileSystem.get()

creds - - a Credentials object to which token(s) will be added

renewer - - the renewer to send with the token request

url - - the URL to which the request is sent

Returns:

a Token, or null if fetch fails.

Throws:

Exception