Package org.apache.hadoop.hdfs.server.common

Enum Class DataNodeLockManager.LockLevel

java.lang.Object

java.lang.Enum<DataNodeLockManager.LockLevel>

org.apache.hadoop.hdfs.server.common.DataNodeLockManager.LockLevel

All Implemented Interfaces:

Serializable, Comparable<DataNodeLockManager.LockLevel>, Constable

Enclosing interface:

org.apache.hadoop.hdfs.server.common.DataNodeLockManager<T extends org.apache.hadoop.hdfs.server.common.AutoCloseDataSetLock>

public static enum DataNodeLockManager.LockLevel
extends Enum<DataNodeLockManager.LockLevel>

Acquire block pool level and volume level lock first if you want to acquire dir lock. Or only acquire block pool level lock. There are several locking sequential patterns as below: 1. block pool 2. block pool -> volume 3. block pool level -> volume -> dir

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Enum

Enum.EnumDesc<E extends Enum<E>>

Enum Constant Summary

Enum Constants

Enum Constant	Description
BLOCK_POOl
DIR
VOLUME

Method Summary

Modifier and Type	Method	Description
static DataNodeLockManager.LockLevel	valueOf(String name)	Returns the enum constant of this class with the specified name.
static DataNodeLockManager.LockLevel[]	values()	Returns an array containing the constants of this enum class, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Details

BLOCK_POOl

public static final DataNodeLockManager.LockLevel BLOCK_POOl

VOLUME

public static final DataNodeLockManager.LockLevel VOLUME

DIR

public static final DataNodeLockManager.LockLevel DIR

Method Details

values

public static DataNodeLockManager.LockLevel[] values()

Returns an array containing the constants of this enum class, in the order they are declared.

Returns:

an array containing the constants of this enum class, in the order they are declared

valueOf

public static DataNodeLockManager.LockLevel valueOf(String name)

Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum class has no constant with the specified name

NullPointerException - if the argument is null