Flink的Interval Join是基于水印（Watermark）和时间窗口（Time Window）实现的。水印是用来检测和处理乱序事件的一种机制，它可以用来估计事件的最大延迟时间。在Flink中，每个事件都会被分配一个时间戳，这个时间戳表示事件发生的时间。当水印的值大于或等于一个事件的时间戳...

问答 2023-08-22 来自：开发者社区

请教下有没有用flink只为了实时cdc刷新报表的场景？多个事实表之间join在正常窗口期一大半都

请教下有没有用flink只为了实时cdc刷新报表的场景？多个事实表之间join在正常窗口期一大半都关联不上，很多需要查表

问答 2021-12-02 来自：开发者社区

如何通过Flink-sql 实现3个kafka-topic的join以及后续的窗口聚合计算操作？

同行们，大家好，请教一个问题，现在有3个kafka的topic：device consumer order 想用Flink-sql计算出多个聚合指标，比如：过去12小时，每个deviceid下的订单量。我是这么设计的：先通过 create table with(...='kafka') ... 注册出 table1 table2 table3 ，指定事件时间、water mark...

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更新时间 2024-06-25 09:02:19

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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。

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MySQL 到 Hologres

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