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Showing content from https://hadoop.apache.org/docs/r1.2.1/api/org/apache/hadoop/security/Credentials.html below:

Credentials (Hadoop 1.2.1 API)

org.apache.hadoop.security
Class Credentials

java.lang.Object
  org.apache.hadoop.security.Credentials

All Implemented Interfaces:: Writable

public class Credentials
extends Object
implements Writable
extends Object
implements Writable

A class that provides the facilities of reading and writing secret keys and Tokens.

Methods inherited from class java.lang.Object clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait Credentials

public Credentials()

getSecretKey

public byte[] getSecretKey(Text alias)

Returns the key bytes for the alias

Parameters:: alias - the alias for the key
Returns:: key for this alias

getToken

public Token<? extends TokenIdentifier> getToken(Text alias)

Returns the Token object for the alias

Parameters:: alias - the alias for the Token
Returns:: token for this alias

addToken

public void addToken(Text alias,
                     Token<? extends TokenIdentifier> t)

Add a token in the storage (in memory)

Parameters:: alias - the alias for the key; t - the token object

getAllTokens

public Collection<Token<? extends TokenIdentifier>> getAllTokens()

Return all the tokens in the in-memory map

numberOfTokens

public int numberOfTokens()

Returns:: number of Tokens in the in-memory map

numberOfSecretKeys

public int numberOfSecretKeys()

Returns:: number of keys in the in-memory map

addSecretKey

public void addSecretKey(Text alias,
                         byte[] key)

Set the key for an alias

Parameters:: alias - the alias for the key; key - the key bytes

readTokenStorageFile

public static Credentials readTokenStorageFile(Path filename,
                                               Configuration conf)
                                        throws IOException

Convenience method for reading a token storage file, and loading the Tokens therein in the passed UGI

Parameters:: filename -; conf -
Throws:: IOException

readTokenStorageStream

public void readTokenStorageStream(DataInputStream in)
                            throws IOException

Convenience method for reading a token storage file directly from a datainputstream

Throws:: IOException

writeTokenStorageToStream

public void writeTokenStorageToStream(DataOutputStream os)
                               throws IOException

Throws:: IOException

writeTokenStorageFile

public void writeTokenStorageFile(Path filename,
                                  Configuration conf)
                           throws IOException

Throws:: IOException

write

public void write(DataOutput out)
           throws IOException

Stores all the keys to DataOutput

Specified by:: write in interface Writable

Parameters:: out -
Throws:: IOException

readFields

public void readFields(DataInput in)
                throws IOException

Loads all the keys

Specified by:: readFields in interface Writable

Parameters:: in -
Throws:: IOException

addAll

public void addAll(Credentials other)

Copy all of the credentials from one credential object into another.

Parameters:: other - the credentials to copy

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