Package org.apache.hadoop.hdfs

Enum AddBlockFlag

java.lang.Object

java.lang.Enum<AddBlockFlag>

org.apache.hadoop.hdfs.AddBlockFlag

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable<AddBlockFlag>

@Private
@Evolving
public enum AddBlockFlag
extends java.lang.Enum<AddBlockFlag>

AddBlockFlag provides hints for new block allocation and placement. Users can use this flag to control per DFSOutputStream

See Also:

ClientProtocol.addBlock(String, String, ExtendedBlock, DatanodeInfo[], long, String[], EnumSet)

Enum Constant Summary

Enum Constants

Enum Constant	Description
IGNORE_CLIENT_LOCALITY	Advise that the first block replica NOT take into account DataNode locality.
NO_LOCAL_RACK	Advise that a block replica NOT be written to the local rack DataNode where 'local' means the same host as the client is being run on.
NO_LOCAL_WRITE	Advise that a block replica NOT be written to the local DataNode where 'local' means the same host as the client is being run on.

Method Summary

Modifier and Type	Method	Description
short	getMode()
static AddBlockFlag	valueOf(short mode)	Returns the enum constant of this type with the specified name.
static AddBlockFlag	valueOf(java.lang.String name)	Returns the enum constant of this type with the specified name.
static AddBlockFlag[]	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

NO_LOCAL_WRITE

public static final AddBlockFlag NO_LOCAL_WRITE

Advise that a block replica NOT be written to the local DataNode where 'local' means the same host as the client is being run on.

See Also:

CreateFlag.NO_LOCAL_WRITE

IGNORE_CLIENT_LOCALITY

public static final AddBlockFlag IGNORE_CLIENT_LOCALITY

Advise that the first block replica NOT take into account DataNode locality. The first block replica should be placed randomly within the cluster. Subsequent block replicas should follow DataNode locality rules.

See Also:

CreateFlag.IGNORE_CLIENT_LOCALITY

NO_LOCAL_RACK

public static final AddBlockFlag NO_LOCAL_RACK

Advise that a block replica NOT be written to the local rack DataNode where 'local' means the same host as the client is being run on.

See Also:

CreateFlag.NO_LOCAL_WRITE

Method Detail

values

public static AddBlockFlag[] 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 (AddBlockFlag c : AddBlockFlag.values())
    System.out.println(c);

Returns:

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

valueOf

public static AddBlockFlag valueOf(java.lang.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:

java.lang.IllegalArgumentException - if this enum type has no constant with the specified name

java.lang.NullPointerException - if the argument is null

valueOf

public static AddBlockFlag valueOf(short mode)

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:

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

Returns:

the enum constant with the specified name

Throws:

java.lang.IllegalArgumentException - if this enum type has no constant with the specified name

java.lang.NullPointerException - if the argument is null

getMode

public short getMode()