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

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

All Implemented Interfaces:

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

public class IPFailoverProxyProvider<T>
extends AbstractNNFailoverProxyProvider<T>

A NNFailoverProxyProvider implementation which works on IP failover setup. Only one proxy is used to connect to both servers and switching between the servers is done by the environment/infrastructure, which guarantees clients can consistently reach only one node at a time. Clients with a live connection will likely get connection reset after an IP failover. This case will be handled by the FailoverOnNetworkExceptionRetry retry policy. I.e. if the call is not idempotent, it won't get retried. A connection reset while setting up a connection (i.e. before sending a request) will be handled in ipc client. The namenode URI must contain a resolvable host name.

Nested Class Summary

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

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

Field Summary

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

fallbackToSimpleAuth

Constructor Summary

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

Method Summary

void	close() Close the proxy,
Class<T>	getInterface()
org.apache.hadoop.io.retry.FailoverProxyProvider.ProxyInfo<T>	getProxy()
void	performFailover(T currentProxy) Nothing to do for IP failover
boolean	useLogicalURI() Logical URI is not used for IP failover.

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

setFallbackToSimpleAuth

Methods inherited from class java.lang.Object

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

Constructor Detail

IPFailoverProxyProvider

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

Method Detail

getInterface

public Class<T> getInterface()

getProxy

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

performFailover

public void performFailover(T currentProxy)

Nothing to do for IP failover

close

public void close()
           throws IOException

Close the proxy,

Throws:

IOException

useLogicalURI

public boolean useLogicalURI()

Logical URI is not used for IP failover.

Specified by:

useLogicalURI in class AbstractNNFailoverProxyProvider<T>

Returns:

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