org.apache.hadoop.hbase

Enum CatalogReplicaMode

java.lang.Object

java.lang.Enum<CatalogReplicaMode>

org.apache.hadoop.hbase.CatalogReplicaMode

All Implemented Interfaces:

Serializable, Comparable<CatalogReplicaMode>

@InterfaceAudience.Private
public enum CatalogReplicaMode
extends Enum<CatalogReplicaMode>

There are two modes with catalog replica support.

1. HEDGED_READ - Client sends requests to the primary region first, within a configured amount of time, if there is no response coming back, client sends requests to all replica regions and takes the first response.
2. LOAD_BALANCE - Client sends requests to replica regions in a round-robin mode, if results from replica regions are stale, next time, client sends requests for these stale locations to the primary region. In this mode, scan requests are load balanced across all replica regions.

Enum Constant Summary

Enum Constants

Enum Constant and Description
HEDGED_READ
LOAD_BALANCE
NONE

Method Summary

Modifier and Type	Method and Description
static CatalogReplicaMode	fromString(String value)
static CatalogReplicaMode	valueOf(String name) Returns the enum constant of this type with the specified name.
static CatalogReplicaMode[]	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

NONE

public static final CatalogReplicaMode NONE

HEDGED_READ

public static final CatalogReplicaMode HEDGED_READ

LOAD_BALANCE

public static final CatalogReplicaMode LOAD_BALANCE

Method Detail

values

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

Returns:

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

valueOf

public static CatalogReplicaMode 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

fromString

public static CatalogReplicaMode fromString(String value)