Package org.apache.hadoop.tools

Class GetGroupsBase

java.lang.Object

org.apache.hadoop.conf.Configured

org.apache.hadoop.tools.GetGroupsBase

All Implemented Interfaces:

Configurable, Tool

public abstract class GetGroupsBase
extends Configured
implements Tool

Base class for the HDFS and MR implementations of tools which fetch and display the groups that users belong to.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	GetGroupsBase(Configuration conf)	Create an instance of this tool using the given configuration.
protected	GetGroupsBase(Configuration conf, PrintStream out)	Used exclusively for testing.

Method Summary

Modifier and Type	Method	Description
protected abstract InetSocketAddress	getProtocolAddress(Configuration conf)	Must be overridden by subclasses to get the address where the GetUserMappingsProtocol implementation is running.
protected GetUserMappingsProtocol	getUgmProtocol()	Get a client of the GetUserMappingsProtocol.
int	run(String[] args)	Get the groups for the users given and print formatted output to the PrintStream configured earlier.

Methods inherited from class org.apache.hadoop.conf.Configured

getConf, setConf

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hadoop.conf.Configurable

getConf, setConf

Constructor Details

GetGroupsBase

protected GetGroupsBase(Configuration conf)

Create an instance of this tool using the given configuration.

Parameters:

conf - configuration.

GetGroupsBase

protected GetGroupsBase(Configuration conf,
 PrintStream out)

Used exclusively for testing.

Parameters:

conf - The configuration to use.

out - The PrintStream to write to, instead of System.out

Method Details

run

public int run(String[] args)
        throws Exception

Get the groups for the users given and print formatted output to the PrintStream configured earlier.

Specified by:

run in interface Tool

Parameters:

args - command specific arguments.

Returns:

exit code.

Throws:

Exception - command exception.

getProtocolAddress

protected abstract InetSocketAddress getProtocolAddress(Configuration conf)
                                                 throws IOException

Must be overridden by subclasses to get the address where the GetUserMappingsProtocol implementation is running.

Parameters:

conf - The configuration to use.

Returns:

The address where the service is listening.

Throws:

IOException - raised on errors performing I/O.

getUgmProtocol

protected GetUserMappingsProtocol getUgmProtocol()
                                          throws IOException

Get a client of the GetUserMappingsProtocol.

Returns:

A GetUserMappingsProtocol client proxy.

Throws:

IOException - raised on errors performing I/O.