实时计算 Flink版watermark乱序的相关内容

文章 2024-02-20 来自：开发者社区

【天衍系列 03】深入理解Flink的Watermark：实时流处理的时间概念与乱序处理

01 基本概念 Watermark 是用于处理事件时间的一种机制，用于表示事件时间流的进展。在流处理中，由于事件到达的顺序和延迟，系统需要一种机制来衡量事件时间的进展，以便正确触发窗口操作等。Watermark 就是用来标记事件时间的进展情况的一种特殊数据元素。 02 工作原理 Watermark 的生成方式通常是由系统根据数据流中的事件来自动推断生成的。一般来说，系统会...

文章 2023-08-31 来自：开发者社区

【原理】Flink如何巧用WaterMark机制解决乱序问题

这是彭文华的第91篇原创问：数据工程师最期望数据怎么来？答：按顺序来。 MapReduce当初能用起来，就是因为Map阶段对所有数据都进行排序了，后面的Reduce阶段就可以直接用排序好的数据了。批处理的时候因为数据已经落地了，咱可以慢慢排序。但是流式数据都是一条一条过来的，这个时候数据到达的时间和出发时的顺序不一致会导致非常多的问题，这该咋整呢？Sparkstreaming对乱序支持很差，因为....

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更新时间 2024-02-21 09:18:55

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实时计算Flink版

阿里云实时计算Flink版(Alibaba Cloud Realtime Compute)，完全兼容开源的Apache Flink，比开源性能提升2～3倍，提供了完整的告警、监控、日志的解决方案、提升开发效率且无运维成本，并有社区专家提供技术支持。

立即开通

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产品文档

实时同步

MySQL 到 Hologres

Kafka 到 Hologres

功能对比

开源Flink对比

成本优化

作业自动调优