org.apache.hadoop.mr1tools

Interface GetUserMappingsProtocol

All Superinterfaces:

org.apache.hadoop.ipc.VersionedProtocol

All Known Subinterfaces:

JTProtocols

All Known Implementing Classes:

JobTracker

@InterfaceAudience.LimitedPrivate(value={"HDFS","MapReduce"})
@InterfaceStability.Evolving
public interface GetUserMappingsProtocol
extends org.apache.hadoop.ipc.VersionedProtocol

Protocol implemented by the Name Node and Job Tracker which maps users to groups.

Field Summary

Fields

Modifier and Type	Field and Description
static long	versionID Version 1: Initial version.

Method Summary

Methods

Modifier and Type	Method and Description
java.lang.String[]	getGroupsForUser(java.lang.String user) Get the groups which are mapped to the given user.

Methods inherited from interface org.apache.hadoop.ipc.VersionedProtocol

getProtocolSignature, getProtocolVersion

Field Detail

versionID

static final long versionID

Version 1: Initial version.

See Also:

Constant Field Values

Method Detail

getGroupsForUser

java.lang.String[] getGroupsForUser(java.lang.String user)
                                    throws java.io.IOException

Get the groups which are mapped to the given user.

Parameters:

user - The user to get the groups for.

Returns:

The set of groups the user belongs to.

Throws:

java.io.IOException