org.apache.hadoop.hdfs.server.namenode.ha
Class ConfiguredFailoverProxyProvider<T>

java.lang.Object
  org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider<T>

All Implemented Interfaces:

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

public class ConfiguredFailoverProxyProvider<T>
extends Object
implements org.apache.hadoop.io.retry.FailoverProxyProvider<T>

A FailoverProxyProvider implementation which allows one to configure two URIs to connect to during fail-over. The first configured address is tried first, and on a fail-over event the other address is tried.

Constructor Summary

ConfiguredFailoverProxyProvider(org.apache.hadoop.conf.Configuration conf, URI uri, Class<T> xface)

Method Summary

void	close() Close all the proxy objects which have been opened over the lifetime of this proxy provider.
Class<T>	getInterface()
T	getProxy() Lazily initialize the RPC proxy object.
void	performFailover(T currentProxy)

Methods inherited from class java.lang.Object

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

Constructor Detail

ConfiguredFailoverProxyProvider

public ConfiguredFailoverProxyProvider(org.apache.hadoop.conf.Configuration conf,
                                       URI uri,
                                       Class<T> xface)

Method Detail

getInterface

public Class<T> getInterface()

Specified by:

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

getProxy

public T getProxy()

Lazily initialize the RPC proxy object.

Specified by:

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

performFailover

public void performFailover(T currentProxy)

Specified by:

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

close

public void close()
           throws IOException

Close all the proxy objects which have been opened over the lifetime of this proxy provider.

Specified by:

close in interface Closeable

Throws:

IOException