Package org.apache.hadoop.hdfs.server.namenode

Class UGIResolver

java.lang.Object

org.apache.hadoop.hdfs.server.namenode.UGIResolver

Direct Known Subclasses:

FsUGIResolver, SingleUGIResolver

@Public
@Unstable
public abstract class UGIResolver
extends Object

Pluggable class for mapping ownership and permissions from an external store to an FSImage.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	GROUP_STRID_OFFSET
static final long	USER_GROUP_STRID_MASK
static final int	USER_STRID_OFFSET

Constructor Summary

Constructors

Constructor	Description
UGIResolver()

Method Summary

Modifier and Type	Method	Description
abstract void	addGroup(String name)
protected void	addGroup(String name, int id)
abstract void	addUser(String name)
protected void	addUser(String name, int id)
protected final long	buildPermissionStatus(String owner, String group, short permission)	Permission is serialized as a 64-bit long. [0:24):[25:48):[48:64) (in Big Endian).
long	getPermissionsProto(FileStatus remoteStatus, AclStatus remoteAcl)	Get the serialized, local permissions for the external FileStatus or AclStatus.
protected String	group(String s)
FsPermission	permission(FsPermission s)
protected void	resetUGInfo()
long	resolve(FileStatus s)
Map<Integer,String>	ugiMap()
protected String	user(String s)

Methods inherited from class java.lang.Object

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

Field Details

USER_STRID_OFFSET

public static final int USER_STRID_OFFSET

See Also:

• Constant Field Values

GROUP_STRID_OFFSET

public static final int GROUP_STRID_OFFSET

See Also:

• Constant Field Values

USER_GROUP_STRID_MASK

public static final long USER_GROUP_STRID_MASK

See Also:

• Constant Field Values

Constructor Details

UGIResolver

public UGIResolver()

Method Details

buildPermissionStatus

protected final long buildPermissionStatus(String owner,
 String group,
 short permission)

Permission is serialized as a 64-bit long. [0:24):[25:48):[48:64) (in Big Endian). The first and the second parts are the string ids of the user and group name, and the last 16 bits are the permission bits.

Parameters:

owner - name of owner

group - name of group

permission - Permission octects

Returns:

FSImage encoding of permissions

ugiMap

public Map<Integer,String> ugiMap()

addUser

public abstract void addUser(String name)

addUser

protected void addUser(String name,
 int id)

addGroup

public abstract void addGroup(String name)

addGroup

protected void addGroup(String name,
 int id)

resetUGInfo

protected void resetUGInfo()

resolve

public long resolve(FileStatus s)

user

protected String user(String s)

group

protected String group(String s)

permission

public FsPermission permission(FsPermission s)

getPermissionsProto

public long getPermissionsProto(FileStatus remoteStatus,
 AclStatus remoteAcl)

Get the serialized, local permissions for the external FileStatus or AclStatus. remoteAcl is used when it is not null, otherwise remoteStatus is used.

Parameters:

remoteStatus - FileStatus on remote store.

remoteAcl - AclStatus on external store.

Returns:

serialized, local permissions the FileStatus or AclStatus map to.