Package org.apache.hadoop.yarn.client

Class RequestHedgingRMFailoverProxyProvider<T>

java.lang.Object

org.apache.hadoop.yarn.client.ConfiguredRMFailoverProxyProvider<T>

org.apache.hadoop.yarn.client.RequestHedgingRMFailoverProxyProvider<T>

All Implemented Interfaces:

Closeable, AutoCloseable, org.apache.hadoop.io.retry.FailoverProxyProvider<T>, RMFailoverProxyProvider<T>

public class RequestHedgingRMFailoverProxyProvider<T>
extends ConfiguredRMFailoverProxyProvider<T>

A FailoverProxyProvider implementation that technically does not "failover" per-se. It constructs a wrapper proxy that sends the request to ALL underlying proxies simultaneously. Each proxy inside the wrapper proxy will retry the corresponding target. It assumes the in an HA setup, there will be only one Active, and the active should respond faster than any configured standbys. Once it receives a response from any one of the configured proxies, outstanding requests to other proxies are immediately cancelled.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.hadoop.io.retry.FailoverProxyProvider

org.apache.hadoop.io.retry.FailoverProxyProvider.ProxyInfo<T extends Object>

Field Summary

Fields inherited from class org.apache.hadoop.yarn.client.ConfiguredRMFailoverProxyProvider

conf, protocol, rmProxy, rmServiceIds

Constructor Summary

Constructors

Constructor	Description
RequestHedgingRMFailoverProxyProvider()

Method Summary

Modifier and Type	Method	Description
protected T	createRetriableProxy()
org.apache.hadoop.io.retry.FailoverProxyProvider.ProxyInfo<T>	getProxy()
void	init(org.apache.hadoop.conf.Configuration configuration, RMProxy<T> rmProxy, Class<T> protocol)	Initialize internal data structures, invoked right after instantiation.
void	performFailover(T currentProxy)

Methods inherited from class org.apache.hadoop.yarn.client.ConfiguredRMFailoverProxyProvider

close, getInterface, getProxyInternal

Methods inherited from class java.lang.Object

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

Constructor Details

RequestHedgingRMFailoverProxyProvider

public RequestHedgingRMFailoverProxyProvider()

Method Details

init

public void init(org.apache.hadoop.conf.Configuration configuration,
 RMProxy<T> rmProxy,
 Class<T> protocol)

Description copied from interface: RMFailoverProxyProvider

Initialize internal data structures, invoked right after instantiation.

Specified by:

init in interface RMFailoverProxyProvider<T>

Overrides:

init in class ConfiguredRMFailoverProxyProvider<T>

Parameters:

configuration - Configuration to use

rmProxy - The RMProxy instance to use

protocol - The communication protocol to use

createRetriableProxy

protected T createRetriableProxy()

getProxy

public org.apache.hadoop.io.retry.FailoverProxyProvider.ProxyInfo<T> getProxy()

Specified by:

getProxy in interface org.apache.hadoop.io.retry.FailoverProxyProvider<T>

Overrides:

getProxy in class ConfiguredRMFailoverProxyProvider<T>

performFailover

public void performFailover(T currentProxy)

Specified by:

performFailover in interface org.apache.hadoop.io.retry.FailoverProxyProvider<T>

Overrides:

performFailover in class ConfiguredRMFailoverProxyProvider<T>