Package org.apache.hadoop.hdfs.protocol

Class SystemErasureCodingPolicies

java.lang.Object

org.apache.hadoop.hdfs.protocol.SystemErasureCodingPolicies

@Private
@Stable
public final class SystemErasureCodingPolicies
extends java.lang.Object

The set of built-in erasure coding policies.

Although this is a private class, EC policy IDs need to be treated like a stable interface. Adding, modifying, or removing built-in policies can cause inconsistencies with older clients.

Field Summary

Fields

Modifier and Type	Field	Description
static byte	RS_10_4_POLICY_ID
static byte	RS_3_2_POLICY_ID
static byte	RS_6_3_LEGACY_POLICY_ID
static byte	RS_6_3_POLICY_ID
static byte	XOR_2_1_POLICY_ID

Method Summary

Modifier and Type	Method	Description
static ErasureCodingPolicy	getByID(byte id)	Get a policy by policy ID.
static ErasureCodingPolicy	getByName(java.lang.String name)	Get a policy by policy name.
static java.util.List<ErasureCodingPolicy>	getPolicies()	Get system defined policies.
static ErasureCodingPolicy	getReplicationPolicy()	Get the special REPLICATION policy.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

RS_6_3_POLICY_ID

public static final byte RS_6_3_POLICY_ID

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Constant Field Values

RS_3_2_POLICY_ID

public static final byte RS_3_2_POLICY_ID

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Constant Field Values

RS_6_3_LEGACY_POLICY_ID

public static final byte RS_6_3_LEGACY_POLICY_ID

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Constant Field Values

XOR_2_1_POLICY_ID

public static final byte XOR_2_1_POLICY_ID

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Constant Field Values

RS_10_4_POLICY_ID

public static final byte RS_10_4_POLICY_ID

See Also:

Constant Field Values

Method Detail

getPolicies

public static java.util.List<ErasureCodingPolicy> getPolicies()

Get system defined policies.

Returns:

system policies

getByID

public static ErasureCodingPolicy getByID(byte id)

Get a policy by policy ID.

Returns:

ecPolicy, or null if not found

getByName

public static ErasureCodingPolicy getByName(java.lang.String name)

Get a policy by policy name.

Returns:

ecPolicy, or null if not found

getReplicationPolicy

public static ErasureCodingPolicy getReplicationPolicy()

Get the special REPLICATION policy.