org.apache.hadoop.hdfs.protocol

枚举 LayoutVersion.Feature

java.lang.Object

java.lang.Enum<LayoutVersion.Feature>

org.apache.hadoop.hdfs.protocol.LayoutVersion.Feature

所有已实现的接口:

Serializable, Comparable<LayoutVersion.Feature>

封闭类:

LayoutVersion

public static enum LayoutVersion.Feature
extends Enum<LayoutVersion.Feature>

Enums for features that change the layout version.

To add a new layout version:

• Define a new enum constant with a short enum name, the new layout version and description of the added feature.
• When adding a layout version with an ancestor that is not same as its immediate predecessor, use the constructor where a spacific ancestor can be passed.

枚举常量概要

枚举常量

枚举常量和说明
APPEND_RBW_DIR
ATOMIC_RENAME
CONCAT
DELEGATION_TOKEN
DISKSPACE_QUOTA
EDITS_CHESKUM
FILE_ACCESS_TIME
FSIMAGE_CHECKSUM
FSIMAGE_COMPRESSION
FSIMAGE_NAME_OPTIMIZATION
NAMESPACE_QUOTA
REMOVE_REL13_DISK_LAYOUT_SUPPORT
RESERVED_REL1_2_0
RESERVED_REL20_203
RESERVED_REL20_204
RESERVED_REL22
RESERVED_REL23
STICKY_BIT
SYMLINKS
UNUSED

方法概要

方法

限定符和类型	方法和说明
int	getAncestorLayoutVersion() Accessor method for feature ancestor layout version
String	getDescription() Accessor method for feature description
int	getLayoutVersion() Accessor method for feature layout version
boolean	isReservedForOldRelease()
static LayoutVersion.Feature	valueOf(String name) 返回带有指定名称的该类型的枚举常量。
static LayoutVersion.Feature[]	values() 按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。

从类继承的方法 java.lang.Enum

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

从类继承的方法 java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

枚举常量详细资料

NAMESPACE_QUOTA

public static final LayoutVersion.Feature NAMESPACE_QUOTA

FILE_ACCESS_TIME

public static final LayoutVersion.Feature FILE_ACCESS_TIME

DISKSPACE_QUOTA

public static final LayoutVersion.Feature DISKSPACE_QUOTA

STICKY_BIT

public static final LayoutVersion.Feature STICKY_BIT

APPEND_RBW_DIR

public static final LayoutVersion.Feature APPEND_RBW_DIR

ATOMIC_RENAME

public static final LayoutVersion.Feature ATOMIC_RENAME

CONCAT

public static final LayoutVersion.Feature CONCAT

SYMLINKS

public static final LayoutVersion.Feature SYMLINKS

DELEGATION_TOKEN

public static final LayoutVersion.Feature DELEGATION_TOKEN

FSIMAGE_COMPRESSION

public static final LayoutVersion.Feature FSIMAGE_COMPRESSION

FSIMAGE_CHECKSUM

public static final LayoutVersion.Feature FSIMAGE_CHECKSUM

REMOVE_REL13_DISK_LAYOUT_SUPPORT

public static final LayoutVersion.Feature REMOVE_REL13_DISK_LAYOUT_SUPPORT

EDITS_CHESKUM

public static final LayoutVersion.Feature EDITS_CHESKUM

UNUSED

public static final LayoutVersion.Feature UNUSED

FSIMAGE_NAME_OPTIMIZATION

public static final LayoutVersion.Feature FSIMAGE_NAME_OPTIMIZATION

RESERVED_REL20_203

public static final LayoutVersion.Feature RESERVED_REL20_203

RESERVED_REL20_204

public static final LayoutVersion.Feature RESERVED_REL20_204

RESERVED_REL22

public static final LayoutVersion.Feature RESERVED_REL22

RESERVED_REL23

public static final LayoutVersion.Feature RESERVED_REL23

RESERVED_REL1_2_0

public static final LayoutVersion.Feature RESERVED_REL1_2_0

方法详细资料

values

public static LayoutVersion.Feature[] values()

按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。该方法可用于迭代 常量, 如下所示:

for (LayoutVersion.Feature c : LayoutVersion.Feature.values())
    System.out.println(c);

valueOf

public static LayoutVersion.Feature valueOf(String name)

返回带有指定名称的该类型的枚举常量。 字符串必须与用于声明该类型的枚举常量的 标识符完全匹配。(不允许有多余 的空格字符。)

参数:

name - 要返回的枚举常量的名称。

getLayoutVersion

public int getLayoutVersion()

Accessor method for feature layout version

返回:

int lv value

getAncestorLayoutVersion

public int getAncestorLayoutVersion()

Accessor method for feature ancestor layout version

返回:

int ancestor LV value

getDescription

public String getDescription()

Accessor method for feature description

返回:

String feature description

isReservedForOldRelease

public boolean isReservedForOldRelease()