org.apache.hadoop.hdfs.server.namenode

Enum NameNodeLayoutVersion.Feature

java.lang.Object

java.lang.Enum<NameNodeLayoutVersion.Feature>

org.apache.hadoop.hdfs.server.namenode.NameNodeLayoutVersion.Feature

All Implemented Interfaces:

Serializable, Comparable<NameNodeLayoutVersion.Feature>, LayoutVersion.LayoutFeature

Enclosing class:

org.apache.hadoop.hdfs.server.namenode.NameNodeLayoutVersion

public static enum NameNodeLayoutVersion.Feature
extends Enum<NameNodeLayoutVersion.Feature>
implements LayoutVersion.LayoutFeature

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 specific ancestor can be passed.

Enum Constant Summary

Enum Constants

Enum Constant and Description
BLOCK_STORAGE_POLICY
CREATE_OVERWRITE
EDITLOG_LENGTH
ROLLING_UPGRADE
XATTRS
XATTRS_NAMESPACE_EXT

Method Summary

Methods

Modifier and Type	Method and Description
LayoutVersion.FeatureInfo	getInfo()
static NameNodeLayoutVersion.Feature	valueOf(String name) Returns the enum constant of this type with the specified name.
static NameNodeLayoutVersion.Feature[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

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

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

ROLLING_UPGRADE

public static final NameNodeLayoutVersion.Feature ROLLING_UPGRADE

EDITLOG_LENGTH

public static final NameNodeLayoutVersion.Feature EDITLOG_LENGTH

XATTRS

public static final NameNodeLayoutVersion.Feature XATTRS

CREATE_OVERWRITE

public static final NameNodeLayoutVersion.Feature CREATE_OVERWRITE

XATTRS_NAMESPACE_EXT

public static final NameNodeLayoutVersion.Feature XATTRS_NAMESPACE_EXT

BLOCK_STORAGE_POLICY

public static final NameNodeLayoutVersion.Feature BLOCK_STORAGE_POLICY

Method Detail

values

public static NameNodeLayoutVersion.Feature[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

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

Returns:

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

valueOf

public static NameNodeLayoutVersion.Feature valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (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 type has no constant with the specified name

NullPointerException - if the argument is null

getInfo

public LayoutVersion.FeatureInfo getInfo()

Specified by:

getInfo in interface LayoutVersion.LayoutFeature