实时计算 Flink版keyby聚合的相关内容

阿里云文档 2024-09-12

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 2024-08-05

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。

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 2021-12-03 来自：开发者社区

Flink 1.10 和 Flink 1.11 中 keyBy 算子聚合多个字段的问题

在 Flink 1.10.x 中的 keyBy 算子可以同时按多个字段分组，比如 map.keyBy(0,1)，但在 1.11.x 版本中这种方式被弃用了，看了下源码好像不支持按多字段分组了？还是有别的其他形式？如果我想按多个字段分组的话需要怎么操作？*来自志愿者整理的flink邮件归档

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 2024-04-30 03:32:58

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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