实时计算 Flink版算子对象的相关内容

阿里云文档 2024-09-12

作业中间结果探查

算子探查功能可以在不修改作业的情况下看到中间结果的输出，降低排查数据正确性错误的难度，提高人效和业务的连续性，减少重点实时业务的中断时间。本文为您介绍如何进行算子探查。

问答 2022-02-15 来自：开发者社区

Flink 在什么时候检查算子中对象的序列化？

我想弄明白什么flink在什么时候，哪些情况需要检查序列化，以及哪些对象会被序列化。静态方法又是如何处理的？有没有仔细研究过这方面，提示一下我怎么看源码或者是如何了解这块。 *来自志愿者整理的flink邮件归档

问答 2022-02-15 来自：开发者社区

flink算子类在多个subtask中是各自初始化1个实例对象吗？

Hi，all： flink算子在多个并行度的job中，每个算子（假如1个算子都有一个对应的java类）在多个subtask中会共享1个java类实例吗？还是每个subtask都会各自的实例？我做了一个简单测试，写了一个flatmap类，在构造方法和open方法中打印类的toString方法，发现输出都不同，是否可以证明每个subtask都初始化了自己的类实例？希望有朋友能解释下算子在j...

问答 2022-02-15 来自：开发者社区

flink 算子中定义的对象内存 checkpoint时会保存到 state中吗

例如，自定义Aggregate函数，accumulator的 Set 中的内容会保存到state中么代码如下： public class AggregateResult implements Serializable { private String key; private Double result = 0.0; private Set distinct; } ...

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更新时间 2024-07-02 15:34:10

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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

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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