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...

Flink SQL No Watermark如何解决？

大家好，请教一个问题我有一条进行 session window 的 sql。这条 sql 消费较少数据量的 topic 的时候，是可以生成 watermark。消费大量的数据的时候，就无法生成watermark。一直是 No Watermark。暂时找不到排查问题的思路。 Flink 版本号是...

请教Flink SQL watermark遇到未来时间的处理问题

您好！我使用Flink SQL (Flink 1.8.0)进行一些聚合计算，消费的是Kafka数据，使用的是EventTime，但是有时候，偶然会出现rowtime字段来了一条未来时间的数据（可能是上送的数据时区导致），这样Watermark会直接推到了未来某个时间点，导致这笔错误数据到达后的数据...

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p...

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更新时间 2024-03-17 10:08:10

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实时计算Flink版

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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