Package org.apache.hadoop.net

Class DomainNameResolverFactory

java.lang.Object

org.apache.hadoop.net.DomainNameResolverFactory

@Private
@Evolving
public final class DomainNameResolverFactory
extends Object

This class creates the DomainNameResolver instance based on the config. It can either create the default resolver for the whole resolving for hadoop or create individual resolver per nameservice or yarn.

Method Summary

Modifier and Type	Method	Description
static DomainNameResolver	newInstance(Configuration conf, String configKey)	This function gets the instance based on the config.
static DomainNameResolver	newInstance(Configuration conf, String host, String configKey)
static DomainNameResolver	newInstance(Configuration conf, URI uri, String configKey)	Create a domain name resolver to convert the domain name in the config to the actual IP addresses of the Namenode/Router/RM.

Methods inherited from class java.lang.Object

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

Method Details

newInstance

public static DomainNameResolver newInstance(Configuration conf,
 URI uri,
 String configKey)

Create a domain name resolver to convert the domain name in the config to the actual IP addresses of the Namenode/Router/RM.

Parameters:

conf - Configuration to get the resolver from.

uri - the url that the resolver will be used against

configKey - The config key name suffixed with the nameservice/yarnservice.

Returns:

Domain name resolver.

newInstance

public static DomainNameResolver newInstance(Configuration conf,
 String host,
 String configKey)

newInstance

public static DomainNameResolver newInstance(Configuration conf,
 String configKey)

This function gets the instance based on the config.

Parameters:

conf - Configuration

configKey - config key name.

Returns:

Domain name resolver.