Package org.apache.hadoop.yarn.service.utils

Class ServiceRegistryUtils

java.lang.Object

org.apache.hadoop.yarn.service.utils.ServiceRegistryUtils

public class ServiceRegistryUtils
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
static final String	SVC_USERS

Constructor Summary

Constructors

Constructor	Description
ServiceRegistryUtils()

Method Summary

Modifier and Type	Method	Description
static String	mkServiceHomePath(String username, String serviceName)	Build the path to a service folder
static String	mkUserHomePath(String username)	Build the path to a user home folder;
static boolean	registryDNSLookupExists(String addr, String name)	Determine whether a DNS lookup exists for a given name.
static String	registryPathForInstance(String instanceName)	Get the registry path for an instance under the user's home node

Methods inherited from class java.lang.Object

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

Field Details

SVC_USERS

public static final String SVC_USERS

See Also:

• Constant Field Values

Constructor Details

ServiceRegistryUtils

public ServiceRegistryUtils()

Method Details

registryPathForInstance

public static String registryPathForInstance(String instanceName)

Get the registry path for an instance under the user's home node

Parameters:

instanceName - application instance

Returns:

a path to the registry location for this application instance.

mkServiceHomePath

public static String mkServiceHomePath(String username,
 String serviceName)

Build the path to a service folder

Parameters:

username - user name

serviceName - service name

Returns:

the home path to the service

mkUserHomePath

public static String mkUserHomePath(String username)

Build the path to a user home folder;

registryDNSLookupExists

public static boolean registryDNSLookupExists(String addr,
 String name)

Determine whether a DNS lookup exists for a given name. If a DNS server address is provided, the lookup will be performed against this DNS server. This option is provided because it may be desirable to perform the lookup against Registry DNS directly to avoid caching of negative responses that may be performed by other DNS servers, thereby allowing the lookup to succeed sooner.

Parameters:

addr - host:port dns address, or null

name - name to look up

Returns:

true if a lookup succeeds for the specified name