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本文将为您介绍三种实时聚合的方案，也是技术递进的过程，适用于不同的场景。

阿里云文档 2026-02-02

使用UDAF实现数据排序和聚合

本文提供了一个自定义聚合函数（UDAF），实现将多行数据合并为一行并按照指定列进行排序，并以居民用电户电网终端数据为例，介绍如何在实时计算控制台使用该函数进行数据聚合和排序。

阿里云文档 2025-06-05

窗口聚合

实时计算Flink版的窗口聚合支持老语法分组窗口聚合（Group Window Aggregation）和新语法窗口表值函数聚合（Window TVF Aggregation）两种形式。本文为您介绍窗口聚合新老语法详情、窗口表值函数和聚合语句无法合并的场景、以及新老语法对更新流的支持情况。

问答 2024-04-14 来自：开发者社区

咨询一个Flink问题，非开窗，非聚合的数据倾斜咋优化呀?

咨询一个Flink问题，非开窗，非聚合的数据倾斜咋优化呀? 前提条件需要保证相同key的数据在一个task 里面处理；场景大概是：上游kafka的数据是用户每个时间点的用户属性变化信息（可能这个时间点是 f1, f2, f3,属性变更；下一个时间点是: f2, f4 属性变更），需要写入到下游数据库属性变化信息也分几种，同一条数据中的属性操作都是一样，比如这条数据需要给用....

阿里云文档 2023-06-01

如何针对资讯聚合类业务场景搭建基于云消息队列Kafka版和实时计算Flink的实时数仓

本文介绍如何针对资讯聚合类业务场景搭建基于云消息队列 Kafka 版和实时计算Flink的实时数仓。

问答 2020-05-07 来自：开发者社区

flink接收kafka数据,利用keyby做窗口聚合,怎么才能避免数据倾斜 #Flink

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更新时间 2024-05-20 15:47:45

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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

产品控制台

产品文档

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