实时计算 Flink版定义watermark 的相关内容

问答 2024-06-13 来自：开发者社区

Flink MySQL不支持定义Watermark如何进行窗口聚合

问答 2023-08-16 来自：开发者社区

Flink CDC中我定义了事件时间的watermark为什么在界面上不显示？

"Flink CDC中我定义了事件时间的watermark为什么在界面上不显示？我用的flinksql 读kafka。时间字符串转了long作为watermark，我这个是因为时间戳提取的有问题？"

问答 2023-06-18 来自：开发者社区

因为Flink CDC源表不是不能定义watermark嘛，那我可以select*一个新表，然后在？

问题1:因为Flink CDC源表不是不能定义watermark嘛，那我可以select*一个新表，然后在新表上定义watermark从而开窗聚合吗？这样可以将流处理变为批处理。不知我的想法可不可行？问题2:emmm应该是吧(flink理解的不是很深)，不知道这可行吗，我是用这个来算数据(捕获到数据包的时间戳)开窗聚合1s，因为得用jion来获取前面一列的数据。所以我觉得如果改为water.....

文章 2022-06-13 来自：开发者社区

Flink 1.10.0 SQL DDL中如何定义watermark和计算列

随着Flink1.10.0版本的发布,在SQL上一个重大的优化是支持了watermark语义的计算,在之前的Flink1.9.x版本中是不支持的,当时只能用SQL DDL进行processing time的计算,但是现在可以进行eventtime语义的计算了,那在Flink1.10.0版本中也推出了很多新的特性,这里就不在多介绍了,本篇文章主要是接上一篇文章,FlinkSQL使用DDL语句创建k....

问答 2022-02-15 来自：开发者社区

flink sql 通过计算列提取字段定义watermark后窗口计算没有结果输出怎么办？

大家好，我遇到一个奇怪的问题，通过计算列提取出某一字段。定义为row_time的watermark，如下面原始字段为message，从中提取13位unix-timestamp，转成timestamp（3）再定义为watermark。执行窗口计算不报错，但是无输出结果。数据源是kafka，各partition内数据均匀。建表语句类似下面（单位机器不能联外网，下面的语句是我手打的，...

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更新时间 2024-06-14 09:41:54

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