FlinkKafkaProducer.Semantic (Flink : Connectors : Kafka 1.17.1 API)

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java.lang.Object
- java.lang.Enum<FlinkKafkaProducer.Semantic>
- - org.apache.flink.streaming.connectors.kafka.FlinkKafkaProducer.Semantic

所有已实现的接口:

Serializable, Comparable<FlinkKafkaProducer.Semantic>

封闭类:

FlinkKafkaProducer<IN>
```
public static enum FlinkKafkaProducer.Semantic
extends Enum<FlinkKafkaProducer.Semantic>
```
Semantics that can be chosen.
EXACTLY_ONCE
AT_LEAST_ONCE
NONE

枚举常量概要

枚举常量
枚举常量和说明
`AT_LEAST_ONCE` Semantic.AT_LEAST_ONCE the Flink producer will wait for all outstanding messages in the Kafka buffers to be acknowledged by the Kafka producer on a checkpoint.
`EXACTLY_ONCE` Semantic.EXACTLY_ONCE the Flink producer will write all messages in a Kafka transaction that will be committed to Kafka on a checkpoint.
`NONE` Semantic.NONE means that nothing will be guaranteed.

方法概要

所有方法静态方法具体方法
限定符和类型	方法和说明
`static FlinkKafkaProducer.Semantic`	`valueOf(String name)` 返回带有指定名称的该类型的枚举常量。
`static FlinkKafkaProducer.Semantic[]`	`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
  - EXACTLY_ONCE
```
public static final FlinkKafkaProducer.Semantic EXACTLY_ONCE
```
    Semantic.EXACTLY_ONCE the Flink producer will write all messages in a Kafka transaction that will be committed to Kafka on a checkpoint.
    In this mode FlinkKafkaProducer sets up a pool of FlinkKafkaInternalProducer. Between each checkpoint a Kafka transaction is created, which is committed on TwoPhaseCommitSinkFunction.notifyCheckpointComplete(long). If checkpoint complete notifications are running late, FlinkKafkaProducer can run out of FlinkKafkaInternalProducers in the pool. In that case any subsequent FlinkKafkaProducer.snapshotState(FunctionSnapshotContext) requests will fail and FlinkKafkaProducer will keep using the FlinkKafkaInternalProducer from the previous checkpoint. To decrease the chance of failing checkpoints there are four options:
  - decrease number of max concurrent checkpoints
  - make checkpoints more reliable (so that they complete faster)
  - increase the delay between checkpoints
  - increase the size of FlinkKafkaInternalProducers pool

AT_LEAST_ONCE
```
public static final FlinkKafkaProducer.Semantic AT_LEAST_ONCE
```
Semantic.AT_LEAST_ONCE the Flink producer will wait for all outstanding messages in the Kafka buffers to be acknowledged by the Kafka producer on a checkpoint.

NONE
```
public static final FlinkKafkaProducer.Semantic NONE
```
Semantic.NONE means that nothing will be guaranteed. Messages can be lost and/or duplicated in case of failure.

方法详细资料
- values
```
public static FlinkKafkaProducer.Semantic[] 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 (FlinkKafkaProducer.Semantic c : FlinkKafkaProducer.Semantic.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 FlinkKafkaProducer.Semantic 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

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