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

Class WrappedFailoverProxyProvider<T>

java.lang.Object

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

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

All Implemented Interfaces:

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

public class WrappedFailoverProxyProvider<T>
extends AbstractNNFailoverProxyProvider<T>

A NNFailoverProxyProvider implementation which wrapps old implementations directly implementing the FailoverProxyProvider interface. It is assumed that the old impelmentation is using logical URI.

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, LOG, ugi, xface

Constructor Summary

Constructors

Constructor	Description
WrappedFailoverProxyProvider(org.apache.hadoop.io.retry.FailoverProxyProvider<T> provider)	Wrap the given instance of an old FailoverProxyProvider.

Method Summary

Modifier and Type	Method	Description
void	close()	Close the proxy,
java.lang.Class<T>	getInterface()
org.apache.hadoop.io.retry.FailoverProxyProvider.ProxyInfo<T>	getProxy()
void	performFailover(T currentProxy)
boolean	useLogicalURI()	Assume logical URI is used for old proxy provider implementations.

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

createProxyIfNeeded, getFallbackToSimpleAuth, getProxyAddresses, getRandomOrder, setFallbackToSimpleAuth

Methods inherited from class java.lang.Object

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

Constructor Detail

WrappedFailoverProxyProvider

public WrappedFailoverProxyProvider(org.apache.hadoop.io.retry.FailoverProxyProvider<T> provider)

Wrap the given instance of an old FailoverProxyProvider.

Method Detail

getInterface

public java.lang.Class<T> getInterface()

Specified by:

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

Overrides:

getInterface in class AbstractNNFailoverProxyProvider<T>

getProxy

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

performFailover

public void performFailover(T currentProxy)

close

public void close()
           throws java.io.IOException

Close the proxy,

Throws:

java.io.IOException

useLogicalURI

public boolean useLogicalURI()

Assume logical URI is used for old proxy provider implementations.

Specified by:

useLogicalURI in class AbstractNNFailoverProxyProvider<T>

Returns:

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