Flink 基础知识 - 时间、窗口、水位线

最近在整理 Flink 方面的知识点，今天更新一遍 Flink 的基础的知识点，让大家对 Flink 的 时间、窗口、水位线 有一个基本的认识，然后下一篇文章会从源码的角度来解析 Flink 在 时间、窗口、水位线 底层是怎么实现的。

话不多说，直接上今天的大纲主题：

图片

Flink 中 定义了 3 种 时间类型：事件时间（Event Time）、处理时间（Processing Time）和摄取时间（Ingestion Time）。

下面画张图来解释一下 3 种 时间类型：

（1）事件时间

事件时间指的是这条数据发生的时间，比如我用手机在某团上 2022-01-01:13:14 这个一时刻下单点了一个外卖，那么下单点外卖的这个时间 2022-01-01:13:14 就是我点外卖这个事件发生的时间，这个时间确定之后就不会改变。

还例如，我们用 Flink 消费 Kafka 里面的日志数据的时候，每条日志里面所包含的时间字段 的时间戳就是事件时间。通过事件时间可以实现时间旅行。

使用事件时间的好处是不依赖服务器的时钟，这一批数据无论你反复执行多少次，得到的结果都是一样的。但是我们使用事件时间的时候，需要从每一条日志数据里面把含有时间戳字段的提取出来。

（2）处理时间

处理时间是指数据被计算引擎（Flink） 处理的时间，这个时间以你 Flink 程序在哪台服务器执行，就以那台服务器的时钟为准。

使用处理时间依赖于操作系统的时钟，但是每台机器的时钟是变化的。比如我开了 2s 的处理时间的窗口去处理数据，但是可能每台服务器的处理数据的能力不一样，可能第一次跑这一批数据的时候，2s 的时间处理了 100 条数据，第二次跑这一批数据的时候，2s 的时间处理了 500 条数据。

这样就会导致两次计算的结果不一样，就是可能是同一台机器也会出现这种情况，因为 处理能力可能受当时 CPU 的影响，在2s 内处理的数据条数不一样。但是处理时间计算逻辑简单，延迟性低性能好于事件时间。

（3）摄取时间

摄取时间是指我们的数据进入 Flink source 算子的时间，摄取时间一般用的比较少，它也会代带来处理数据的结果不正确的情况。

在代码层面怎么使用这三个时间：

StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
//使用事件时间
env.setStreamTimeCharacteristic(TimeCharacteristic.EventTime);
//使用处理时间
env.setStreamTimeCharacteristic(TimeCharacteristic.ProcessingTime);
//使用摄取时间
env.setStreamTimeCharacteristic(TimeCharacteristic.IngestionTime);

窗口

批处理本质上是处理有限不变的数据集，流处理的本质是处理无限持续产生的数据集，所以批本质上来说是流的一种特例，那么窗口就是流和批统一的桥梁，对流上的数据进行窗口切分。

每一个窗口一旦到了要计算的时候，就可以被看成一个不可变的数据集，在触发计算之前，窗口里面的数据可能会持续的改变，因此对窗口的数据进行计算就是批处理。

Flink 中窗口按照是否并发执行，分为 Keyed Window 和 Non-Keyed Window，它们主要的区别是有没有 keyBy 操作。

Keyed Window 可以按照指定的分区方式并发执行，所有相同的键会被分配到相同的任务上执行。Non-Keyed Window 会把所有数据放到一个任务上执行，并发度为 1。下面是窗口相关的API。

1. Keyed Wind
2. Keyed Wind

stream
.keyBy(…)
.window(…) // 接受 WindowAssigner 参数，用来分配窗口
[.trigger(…)] // 可选的，接受 Trigger 类型参数，用来触发窗口
[.evictor(…)] // 可选的，接受 Evictor 类型参数，用来驱逐窗口中的数据
// 可选的，接受 Time 类型参数，表示窗口允许的最大延迟，超过该延迟，数据会被丢弃
[.allowedLateness(…)]
// 可选的，接受 OutputTag 类型参数，用来定义抛弃数据的输出
[.sideOutputLateData(…)]
.reduce/aggregate/apply() // 窗口函数
[.getSideOutput(…)] // 可选的，获取指定的 DataStream

2. Non-Keyed Windows

stream
.windowAll(…) // 接受 WindowAssigner 参数，用来分配窗口
[.trigger(…)] // 可选的，接受 Trigger 类型参数，用来触发窗口
[.evictor(…)] // 可选的，接受 Evictor 类型参数，用来驱逐窗口中的数据
// 可选的，接受 Time 类型参数，表示窗口允许的最大延迟，超过该延迟，数据会被丢弃
[.allowedLateness(…)]
// 可选的，接受 OutputTag 类型参数，用来定义抛弃数据的输出
[.sideOutputLateData(…)]
.reduce/aggregate/apply() // 窗口函数
[.getSideOutput(…)] // 可选的，获取指定的 DataStream

2. Non-Keyed Windows

stream
.windowAll(…) // 接受 WindowAssigner 参数，用来分配窗口
[.trigger(…)] // 可选的，接受 Trigger 类型参数，用来触发窗口
[.evictor(…)] // 可选的，接受 Evictor 类型参数，用来驱逐窗口中的数据
// 可选的，接受 Time 类型参数，表示窗口允许的最大延迟，超过该延迟，数据会被丢弃
[.allowedLateness(…)]
// 可选的，接受 OutputTag 类型参数，用来定义抛弃数据的输出
[.sideOutputLateData(…)]
.reduce/aggregate/apply() // 窗口函数
[.getSideOutput(…)] // 可选的，获取指定的 DataStream

下面我们来看看上面提到的几个概念。

WindowAssiner：窗口分配器。我们常用的滚动窗口、滑动窗口、会话窗口等就是由 WindowAssiner 决定的，比如 TumblingEventTimeWindows 可以基于事件时间的滚动窗口。

Trigger：触发器。Flink 根据 WindowAssigner 把数据分配到不同的窗口，还需要知道什么时候触发窗口，Trigger 就是用来判断什么时候触发窗口的计算。Trigger 类中定义了一些返回值类型，根据返回值类型来决定是否触发窗口的计算。

Evictor：驱逐器。在窗口触发之后，在调用用户自己写的窗口函数之前或者之后，Flink 允许我们定制要处理的数据集合，Evictor 就是用来驱逐或者过滤不需要的数据集的。

Allowed Lateness：最大允许延迟。主要用在基于事件时间的窗口，表示水位线触发窗口计算之后还允许数据迟到多久，在最长允许的延迟时间内，窗口是不会销毁的。

Window Function：窗口函数。用户代码执行函数，就是用户自己写的业务逻辑，用来做真正计算的。

Side Output：丢弃数据的集合。通过 getSideOutput 方法可以获取丢弃的数据，然后用户自己灵活去处理丢弃的数据。

下面我们来看看 Flink 里面的 计数窗口，时间窗口，会话窗口

（1）计数窗口

这个用到的不多，这里就不做介绍了。

（2）时间窗口

Tumble Time Window（滚动窗口）

图片

表示在时间上按照事先约定的窗口大小（就是你在代码里面指定的窗口大小）进行窗口的切分，窗口之间不会相互重叠。

基于时间的 滚动窗口 又分为 基于 处理时间的 滚动窗口 和 基于事件时间的 滚动窗口。具体如下：

处理时间的 滚动窗口：

.window(TumblingProcessingTimeWindows.of(Time.seconds(10)))

事件时间的 滚动窗口：

.window(TumblingEventTimeWindows.of(Time.seconds(10)))

Sliding Time Window（滑动窗口）

图片

与滚动窗口类似，滑动窗口的 assigner 分发元素到指定大小的窗口，窗口大小通过 window size 参数设置。 滑动窗口需要一个额外的滑动距离（window slide）参数来控制生成新窗口的频率。 因此，如果 slide 小于窗口大小，滑动窗口可以允许窗口重叠。这种情况下，一个元素可能会被分发到多个窗口。

比如说，你设置了大小为 10 分钟，滑动距离 5 分钟的窗口，你会在每 5 分钟得到一个新的窗口， 里面包含之前 10 分钟到达的数据（如上图所示）。

基于时间的 滑动窗口 又分为 基于 处理时间的 滑动窗口 和 基于事件时间的 滑动窗口。具体如下：

处理时间的 滑动窗口：

.window(SlidingProcessingTimeWindows.of(Time.minutes(10), Time.minutes(5)))

事件时间的 滑动窗口：

.window(SlidingEventTimeWindows.of(Time.minutes(10), Time.minutes(5)));

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水位线（Watermark） 用于处理乱序事件，而正确的处理乱序事件，通常用 Watermark 机制结合窗口来实现。

从流处理原始设备产生事件，到 Flink 读取到数据，再到 Flink 多个算子处理数据，在这个过程中，会受到网络延迟、数据乱序、背压、Failover 等多种情况的影响，导致数据是乱序的。

虽然大部分情况下是没有问题，但是不得不在设计上考虑此类异常情况，为了保证计算结果的正确性，需要等待数据，这带来了计算的延迟。对于延迟太久的数据，不能无限的等下去，所以必须有一个机制，来保证特定的时间后一定会触发窗口的来进行计算，这个触发机制就是水位线（Watermark）。