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在Apache Flink中手动更新状态的最佳方法是什么？

我在股票市场项目中使用Apache Flink来计算当前的价格变化。公式是 price_change = (current_price - previous_close_price) / previous_close_priceprevious_close_price是交易所前一天的证券收盘价。在市...

Apache Flink：运营商状态检查点

"我想使用Operator State APIin No-Keyed Stream来保存count下面示例中的状态。我该怎么办？ public static class MapFunction implements MapFunction,CheckpointedFunction{ int coun...

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" 清除DataStream中的Flink水印状态"

"是否可以清除DataStream中的当前水印？一个月长水印的示例输入，没有允许延迟：[ {timestamp：'10 / 2018'}， {时间戳：'11 / 2018'}， {timestamp：'11 / 2018'，clearState：true}， {timestamp：'9/2018'}...

我发现flink会先取到之前计算的状态,然后计算新的状态, 但是之前的结果状态同样会进sink函数插一次库, 怎样才能避免中间状态的入库啊

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Flink状态管理和容错机制介绍

本文主要内容如下：有状态的流数据处理； Flink中的状态接口；状态管理和容错机制实现；阿里相关工作介绍；一.有状态的流数据处理# 1.1.什么是有状态的计算# 计算任务的结果不仅仅依赖于输入，还依赖于它的当前状态，其实大多数的计算都是有状态的计算。比如wordcount,给一些word,...

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flink sql 从savepoint启动恢复程序状态，反序列化后，程序的数据有问题，flink sql写的程序如何从savepoint 启动

请问下各位大佬，在Flink里面频繁出现Checkpoint expired before completing的错误，状态本身并不大，看了一下Checkpoint确认的进度56/64 (88%)，还有几个不知道什么原因迟迟收不到Acknowledge。请问下出现这种现象是什么原因？

转自钉钉群21789141：请问下各位大佬，在Flink里面频繁出现Checkpoint expired before completing的错误，状态本身并不大，看了一下Checkpoint确认的进度56/64 (88%)，还有几个不知道什么原因迟迟收不到Acknowledge。请问下出现这种现象...

Flink原理与实现：详解Flink中的状态管理

Flink原理与实现系列文章： Flink 原理与实现：架构和拓扑概览Flink 原理与实现：如何生成 StreamGraphFlink 原理与实现：如何生成 JobGraphFlink原理与实现：如何生成ExecutionGraph及物理执行图Flink原理与实现：Operator Chain原...

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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