Package org.apache.hadoop.hdfs.server.namenode.ha

Class RouterObserverReadProxyProvider<T>

java.lang.Object

org.apache.hadoop.hdfs.server.namenode.ha.AbstractNNFailoverProxyProvider<T>

org.apache.hadoop.hdfs.server.namenode.ha.RouterObserverReadProxyProvider<T>

All Implemented Interfaces:

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

Direct Known Subclasses:

RouterObserverReadConfiguredFailoverProxyProvider

public class RouterObserverReadProxyProvider<T>
extends AbstractNNFailoverProxyProvider<T>

A FailoverProxyProvider implementation to support automatic msync-ing when using routers. This constructs a wrapper proxy around an internal one, and injects msync calls when necessary via the InvocationHandler.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.hdfs.server.namenode.ha.AbstractNNFailoverProxyProvider

AbstractNNFailoverProxyProvider.NNProxyInfo<T>

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

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

Field Summary

Fields inherited from class org.apache.hadoop.hdfs.server.namenode.ha.AbstractNNFailoverProxyProvider

conf, factory, fallbackToSimpleAuth, ugi, xface

Constructor Summary

Constructors

Constructor	Description
RouterObserverReadProxyProvider(org.apache.hadoop.conf.Configuration conf, java.net.URI uri, java.lang.Class<T> xface, HAProxyFactory<T> factory)
RouterObserverReadProxyProvider(org.apache.hadoop.conf.Configuration conf, java.net.URI uri, java.lang.Class<T> xface, HAProxyFactory<T> factory, AbstractNNFailoverProxyProvider<T> failoverProxy)

Method Summary

Modifier and Type	Method	Description
void	close()
org.apache.hadoop.ipc.AlignmentContext	getAlignmentContext()
org.apache.hadoop.io.retry.FailoverProxyProvider.ProxyInfo<T>	getProxy()
void	performFailover(T currentProxy)
boolean	useLogicalURI()	Inquire whether logical HA URI is used for the implementation.

Methods inherited from class org.apache.hadoop.hdfs.server.namenode.ha.AbstractNNFailoverProxyProvider

createProxyIfNeeded, getFallbackToSimpleAuth, getInterface, getProxyAddresses, getRandomOrder, setFallbackToSimpleAuth

Methods inherited from class java.lang.Object

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

Constructor Detail

RouterObserverReadProxyProvider

public RouterObserverReadProxyProvider(org.apache.hadoop.conf.Configuration conf,
                                       java.net.URI uri,
                                       java.lang.Class<T> xface,
                                       HAProxyFactory<T> factory)

RouterObserverReadProxyProvider

public RouterObserverReadProxyProvider(org.apache.hadoop.conf.Configuration conf,
                                       java.net.URI uri,
                                       java.lang.Class<T> xface,
                                       HAProxyFactory<T> factory,
                                       AbstractNNFailoverProxyProvider<T> failoverProxy)

Method Detail

getAlignmentContext

public org.apache.hadoop.ipc.AlignmentContext getAlignmentContext()

getProxy

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

performFailover

public void performFailover(T currentProxy)

useLogicalURI

public boolean useLogicalURI()

Description copied from class: AbstractNNFailoverProxyProvider

Inquire whether logical HA URI is used for the implementation. If it is used, a special token handling may be needed to make sure a token acquired from a node in the HA pair can be used against the other node.

Specified by:

useLogicalURI in class AbstractNNFailoverProxyProvider<T>

Returns:

true if logical HA URI is used. false, if not used.

close

public void close()
           throws java.io.IOException

Throws:

java.io.IOException