环境说明：flink 1.15 场景描述：left 表是一个来源于kafka的表且定义了水位线，right表是来自于mysql cdc的表，right表定义了主键和水位线，按flink官方说法right表就是一个版本表了。2个表按FOR SYSTEM_TIME AS OF事件时间的方式关联。且关联字段都是主键。在执行环境中设置了程序的并行度为3。问题描述：right表本身有不少数据了，当lef....

问答 2024-03-22 来自：开发者社区

请问flink sql 事件时间 Temporal Join 不触发计算

环境说明：flink 1.15 场景描述：left 表是一个来源于kafka的表且定义了水位线，right表是来自于mysql cdc的表，right表定义了主键和水位线，按flink官方说法right表就是一个版本表了。2个表按FOR SYSTEM_TIME AS OF事件时间的方式关联。且关联字段都是主键。问题描述：right表本身有不少数据了，当left来一条数据的时候结果没有触发计算。....

问答 2023-09-19 来自：开发者社区

Flink 处理 Kafka的数据，需要 join 一个基础表来计算，会实时的体现在计算结果里吗？

请教一个问题：Flink 处理 Kafka的数据，需要 join 一个基础表来计算，如果这个基础表的数据有更新，会实时的体现在计算结果里吗？还是说基础表更新后，需要重新运行这个 flink 任务才可以起作用？

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 2024-03-26 12:02:21

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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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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