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 2023-05-23 来自：开发者社区

Flink CDC中interval join 有什么办法可以把超过watermark又没匹配上的？

Flink CDC中interval join 有什么办法可以把超过watermark又没匹配上的数据收集到吗？？找了半天没找到可以设置sideOutputLateData的地方？

问答 2021-12-05 来自：开发者社区

关于Flink SQL中Interval Join使用时watermark的疑惑

在Flink SQL定义了两张kafka表（A表和B表），类型为debezium-json，然后要进行区间JOIN，SQL类似这样： select * from A left join B on A.id = B.id and B.dt BETWEEN A.dt and A.dt + INTERVAL '30' SECOND 第一个问题是：想要在A和B表中显示定义watermark（dt字段...

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更新时间 2024-02-08 09:19:35

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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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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