org.apache.hadoop.hbase.client

Enum Consistency

java.lang.Object

java.lang.Enum<Consistency>

org.apache.hadoop.hbase.client.Consistency

All Implemented Interfaces:

Serializable, Comparable<Consistency>

@InterfaceAudience.Public
@InterfaceStability.Evolving
public enum Consistency
extends Enum<Consistency>

Consistency defines the expected consistency level for an operation.

Enum Constant Summary

Enum Constants

Enum Constant and Description
STRONG Strong consistency is the default consistency model in HBase, where reads and writes go through a single server which serializes the updates, and returns all data that was written and ack'd.
TIMELINE Timeline consistent reads might return values that may not see the most recent updates.

Method Summary

Methods

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

STRONG

public static final Consistency STRONG

Strong consistency is the default consistency model in HBase, where reads and writes go through a single server which serializes the updates, and returns all data that was written and ack'd.

TIMELINE

public static final Consistency TIMELINE

Timeline consistent reads might return values that may not see the most recent updates. Write transactions are always performed in strong consistency model in HBase which guarantees that transactions are ordered, and replayed in the same order by all copies of the data. In timeline consistency, the get and scan requests can be answered from data that may be stale.
The client may still observe transactions out of order if the requests are responded from different servers.

Method Detail

values

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

Returns:

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

valueOf

public static Consistency 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