Package org.apache.hadoop.yarn.lib

Class ZKClient

java.lang.Object

org.apache.hadoop.yarn.lib.ZKClient

public class ZKClient
extends java.lang.Object

ZK Registration Library currently does not use any authorization

Constructor Summary

Constructors

Constructor	Description
ZKClient(java.lang.String string)	the zookeeper client library to talk to zookeeper

Method Summary

Modifier and Type	Method	Description
java.lang.String	getServiceData(java.lang.String path)	get data published by the service at the registration address.
java.util.List<java.lang.String>	listServices(java.lang.String path)	list the services registered under a path.
void	registerService(java.lang.String path, java.lang.String data)	register the service to a specific path.
void	unregisterService(java.lang.String path)	unregister the service.

Methods inherited from class java.lang.Object

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

Constructor Detail

ZKClient

public ZKClient(java.lang.String string)
         throws java.io.IOException

the zookeeper client library to talk to zookeeper

Parameters:

string - the host

Throws:

java.io.IOException - if there are I/O errors.

Method Detail

registerService

public void registerService(java.lang.String path,
                            java.lang.String data)
                     throws java.io.IOException,
                            java.lang.InterruptedException

register the service to a specific path.

Parameters:

path - the path in zookeeper namespace to register to

data - the data that is part of this registration

Throws:

java.io.IOException - if there are I/O errors.

java.lang.InterruptedException - if any thread has interrupted.

unregisterService

public void unregisterService(java.lang.String path)
                       throws java.io.IOException,
                              java.lang.InterruptedException

unregister the service.

Parameters:

path - the path at which the service was registered

Throws:

java.io.IOException - if there are I/O errors.

java.lang.InterruptedException - if any thread has interrupted.

listServices

public java.util.List<java.lang.String> listServices(java.lang.String path)
                                              throws java.io.IOException,
                                                     java.lang.InterruptedException

list the services registered under a path.

Parameters:

path - the path under which services are registered

Returns:

the list of names of services registered

Throws:

java.io.IOException - if there are I/O errors.

java.lang.InterruptedException - if any thread has interrupted.

getServiceData

public java.lang.String getServiceData(java.lang.String path)
                                throws java.io.IOException,
                                       java.lang.InterruptedException

get data published by the service at the registration address.

Parameters:

path - the path where the service is registered

Returns:

the data of the registered service

Throws:

java.io.IOException - if there are I/O errors.

java.lang.InterruptedException - if any thread has interrupted.