Package org.apache.hadoop.hdfs.protocol

Class ErasureCodingPolicy

java.lang.Object

org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy

All Implemented Interfaces:

java.io.Serializable

@Private
public final class ErasureCodingPolicy
extends java.lang.Object
implements java.io.Serializable

A policy about how to write/read/code an erasure coding file.

Note this class should be lightweight and immutable, because it's cached by SystemErasureCodingPolicies, to be returned as a part of HdfsFileStatus.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
ErasureCodingPolicy(java.lang.String name, org.apache.hadoop.io.erasurecode.ECSchema schema, int cellSize, byte id)
ErasureCodingPolicy(org.apache.hadoop.io.erasurecode.ECSchema schema, int cellSize)
ErasureCodingPolicy(org.apache.hadoop.io.erasurecode.ECSchema schema, int cellSize, byte id)

Method Summary

Modifier and Type	Method	Description
static java.lang.String	composePolicyName(org.apache.hadoop.io.erasurecode.ECSchema schema, int cellSize)
boolean	equals(java.lang.Object o)
int	getCellSize()
java.lang.String	getCodecName()
byte	getId()
java.lang.String	getName()
int	getNumDataUnits()
int	getNumParityUnits()
org.apache.hadoop.io.erasurecode.ECSchema	getSchema()
int	hashCode()
boolean	isReplicationPolicy()
boolean	isSystemPolicy()
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

ErasureCodingPolicy

public ErasureCodingPolicy(java.lang.String name,
                           org.apache.hadoop.io.erasurecode.ECSchema schema,
                           int cellSize,
                           byte id)

ErasureCodingPolicy

public ErasureCodingPolicy(org.apache.hadoop.io.erasurecode.ECSchema schema,
                           int cellSize,
                           byte id)

ErasureCodingPolicy

public ErasureCodingPolicy(org.apache.hadoop.io.erasurecode.ECSchema schema,
                           int cellSize)

Method Detail

composePolicyName

public static java.lang.String composePolicyName(org.apache.hadoop.io.erasurecode.ECSchema schema,
                                                 int cellSize)

getName

public java.lang.String getName()

getSchema

public org.apache.hadoop.io.erasurecode.ECSchema getSchema()

getCellSize

public int getCellSize()

getNumDataUnits

public int getNumDataUnits()

getNumParityUnits

public int getNumParityUnits()

getCodecName

public java.lang.String getCodecName()

getId

public byte getId()

isReplicationPolicy

public boolean isReplicationPolicy()

isSystemPolicy

public boolean isSystemPolicy()

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object