Package org.apache.hadoop.tools

Interface GetUserMappingsProtocol

@LimitedPrivate({"HDFS","MapReduce"})
@Evolving
public interface GetUserMappingsProtocol

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

Field Summary

Fields

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

Method Summary

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

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 - raised on errors performing I/O.