org.apache.hadoop.hbase.client

枚举 Consistency

java.lang.Object

java.lang.Enum<Consistency>

org.apache.hadoop.hbase.client.Consistency

所有已实现的接口:

Serializable, Comparable<Consistency>

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

Consistency defines the expected consistency level for an operation.

枚举常量概要

枚举常量

枚举常量和说明
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.

方法概要

限定符和类型	方法和说明
static Consistency	valueOf(String name) 返回带有指定名称的该类型的枚举常量。
static Consistency[]	values() 按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。

从类继承的方法 java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

从类继承的方法 java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

枚举常量详细资料

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.

方法详细资料

values

public static Consistency[] values()

按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。该方法可用于迭代 常量, 如下所示:

for (Consistency c : Consistency.values())
    System.out.println(c);

返回:

按照声明该枚举类型的常量的顺序返回的包含这些常量的数组

valueOf

public static Consistency valueOf(String name)

返回带有指定名称的该类型的枚举常量。 字符串必须与用于声明该类型的枚举常量的 标识符完全匹配。(不允许有多余 的空格字符。)

参数:

name - 要返回的枚举常量的名称。

返回:

返回带有指定名称的枚举常量

抛出:

IllegalArgumentException - 如果该枚举类型没有带有指定名称的常量

NullPointerException - 如果参数为空值