org.apache.flink.streaming.api.operators

枚举 ChainingStrategy

java.lang.Object

java.lang.Enum<ChainingStrategy>

org.apache.flink.streaming.api.operators.ChainingStrategy

所有已实现的接口:

Serializable, Comparable<ChainingStrategy>

@PublicEvolving
public enum ChainingStrategy
extends Enum<ChainingStrategy>

Defines the chaining scheme for the operator. When an operator is chained to the predecessor, it means that they run in the same thread. They become one operator consisting of multiple steps.

The default value used by the StreamOperator is HEAD, which means that the operator is not chained to its predecessor. Most operators override this with ALWAYS, meaning they will be chained to predecessors whenever possible.

枚举常量概要

枚举常量

枚举常量和说明
ALWAYS Operators will be eagerly chained whenever possible.
HEAD The operator will not be chained to the predecessor, but successors may chain to this operator.
HEAD_WITH_SOURCES This operator will run at the head of a chain (similar as in HEAD, but it will additionally try to chain source inputs if possible.
NEVER The operator will not be chained to the preceding or succeeding operators.

字段概要

字段

限定符和类型	字段和说明
static ChainingStrategy	DEFAULT_CHAINING_STRATEGY

方法概要

限定符和类型	方法和说明
static ChainingStrategy	valueOf(String name) 返回带有指定名称的该类型的枚举常量。
static ChainingStrategy[]	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

ALWAYS

public static final ChainingStrategy ALWAYS

Operators will be eagerly chained whenever possible.

To optimize performance, it is generally a good practice to allow maximal chaining and increase operator parallelism.

NEVER

public static final ChainingStrategy NEVER

The operator will not be chained to the preceding or succeeding operators.

HEAD

public static final ChainingStrategy HEAD

The operator will not be chained to the predecessor, but successors may chain to this operator.

HEAD_WITH_SOURCES

public static final ChainingStrategy HEAD_WITH_SOURCES

This operator will run at the head of a chain (similar as in HEAD, but it will additionally try to chain source inputs if possible. This allows multi-input operators to be chained with multiple sources into one task.

字段详细资料

DEFAULT_CHAINING_STRATEGY

public static final ChainingStrategy DEFAULT_CHAINING_STRATEGY

方法详细资料

values

public static ChainingStrategy[] 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 (ChainingStrategy c : ChainingStrategy.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 ChainingStrategy 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