org.apache.hadoop.ipc
Class RPC

java.lang.Object
  org.apache.hadoop.ipc.RPC

public class RPC
extends Object

A simple RPC mechanism. A protocol is a Java interface. All parameters and return types must be one of:

• a primitive type, boolean, byte, char, short, int, long, float, double, or void; or
• a String; or
• a Writable; or
• an array of the above types

All methods in the protocol should throw only IOException. No field data of the protocol instance is transmitted.

Nested Class Summary

static class	RPC.Server An RPC Server.
static class	RPC.VersionMismatch A version mismatch for the RPC protocol.

Method Summary

static Object[]	call(Method method, Object[][] params, InetSocketAddress[] addrs, Configuration conf) Expert: Make multiple, parallel calls to a set of servers.
static VersionedProtocol	getProxy(Class<?> protocol, long clientVersion, InetSocketAddress addr, Configuration conf) Construct a client-side proxy object with the default SocketFactory
static VersionedProtocol	getProxy(Class<?> protocol, long clientVersion, InetSocketAddress addr, Configuration conf, SocketFactory factory) Construct a client-side proxy object that implements the named protocol, talking to a server at the named address.
static VersionedProtocol	getProxy(Class<?> protocol, long clientVersion, InetSocketAddress addr, UserGroupInformation ticket, Configuration conf, SocketFactory factory) Construct a client-side proxy object that implements the named protocol, talking to a server at the named address.
static RPC.Server	getServer(Object instance, String bindAddress, int port, Configuration conf) Construct a server for a protocol implementation instance listening on a port and address.
static RPC.Server	getServer(Object instance, String bindAddress, int port, int numHandlers, boolean verbose, Configuration conf) Construct a server for a protocol implementation instance listening on a port and address.
static void	stopProxy(VersionedProtocol proxy) Stop this proxy and release its invoker's resource
static VersionedProtocol	waitForProxy(Class protocol, long clientVersion, InetSocketAddress addr, Configuration conf)

Methods inherited from class java.lang.Object

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

Method Detail

waitForProxy

public static VersionedProtocol waitForProxy(Class protocol,
                                             long clientVersion,
                                             InetSocketAddress addr,
                                             Configuration conf)
                                      throws IOException

Throws:

IOException

getProxy

public static VersionedProtocol getProxy(Class<?> protocol,
                                         long clientVersion,
                                         InetSocketAddress addr,
                                         Configuration conf,
                                         SocketFactory factory)
                                  throws IOException

Construct a client-side proxy object that implements the named protocol, talking to a server at the named address.

Throws:

IOException

getProxy

public static VersionedProtocol getProxy(Class<?> protocol,
                                         long clientVersion,
                                         InetSocketAddress addr,
                                         UserGroupInformation ticket,
                                         Configuration conf,
                                         SocketFactory factory)
                                  throws IOException

Construct a client-side proxy object that implements the named protocol, talking to a server at the named address.

Throws:

IOException

getProxy

public static VersionedProtocol getProxy(Class<?> protocol,
                                         long clientVersion,
                                         InetSocketAddress addr,
                                         Configuration conf)
                                  throws IOException

Construct a client-side proxy object with the default SocketFactory

Parameters:

protocol -

clientVersion -

addr -

conf -

Returns:

a proxy instance

Throws:

IOException

stopProxy

public static void stopProxy(VersionedProtocol proxy)

Stop this proxy and release its invoker's resource

Parameters:

proxy - the proxy to be stopped

call

public static Object[] call(Method method,
                            Object[][] params,
                            InetSocketAddress[] addrs,
                            Configuration conf)
                     throws IOException

Expert: Make multiple, parallel calls to a set of servers.

Throws:

IOException

getServer

public static RPC.Server getServer(Object instance,
                                   String bindAddress,
                                   int port,
                                   Configuration conf)
                            throws IOException

Construct a server for a protocol implementation instance listening on a port and address.

Throws:

IOException

getServer

public static RPC.Server getServer(Object instance,
                                   String bindAddress,
                                   int port,
                                   int numHandlers,
                                   boolean verbose,
                                   Configuration conf)
                            throws IOException

Construct a server for a protocol implementation instance listening on a port and address.

Throws:

IOException