org.apache.hadoop.yarn.client.util

Class YarnClientUtils

java.lang.Object

org.apache.hadoop.yarn.client.util.YarnClientUtils

public abstract class YarnClientUtils
extends Object

This class is a container for utility methods that are useful when creating YARN clients.

Constructor Summary

Constructors

Constructor and Description
YarnClientUtils()

Method Summary

Modifier and Type	Method and Description
static String	getRmPrincipal(org.apache.hadoop.conf.Configuration conf) Look up and return the resource manager's principal.
static String	getRmPrincipal(String rmPrincipal, org.apache.hadoop.conf.Configuration conf) Perform the _HOST replacement in the principal, Returning the result.

Methods inherited from class java.lang.Object

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

Constructor Detail

YarnClientUtils

public YarnClientUtils()

Method Detail

getRmPrincipal

public static String getRmPrincipal(org.apache.hadoop.conf.Configuration conf)
                             throws IOException

Look up and return the resource manager's principal. This method automatically does the _HOST replacement in the principal and correctly handles HA resource manager configurations.

Parameters:

conf - the Configuration file from which to read the principal

Returns:

the resource manager's principal string or null if the YarnConfiguration.RM_PRINCIPAL property is not set in the conf parameter

Throws:

IOException - thrown if there's an error replacing the host name

getRmPrincipal

public static String getRmPrincipal(String rmPrincipal,
                                    org.apache.hadoop.conf.Configuration conf)
                             throws IOException

Perform the _HOST replacement in the principal, Returning the result. Correctly handles HA resource manager configurations.

Parameters:

rmPrincipal - the principal string to prepare

conf - the configuration

Returns:

the prepared principal string

Throws:

IOException - thrown if there's an error replacing the host name