{"componentChunkName":"component---src-templates-best-practice-detail-tsx","path":"/best-practice/2021-02-04-scf-asynchronous","result":{"data":{"currentBlog":{"id":"78625ce9-87ce-5ba9-aa95-1fd16d80ffd6","frontmatter":{"thumbnail":"https://main.qcloudimg.com/raw/db9232e1ca6603964ba35e806f87ee80.jpg","authors":["陈涛"],"categories":["best-practice"],"date":"2021-02-04T00:00:00.000Z","title":"腾讯云 Serverless 重试策略配置能力解读","description":"平台的默认重试策略可满足大多数开发者错误重试的诉求，特殊场景下用户可选择自行配置","authorslink":null,"translators":null,"translatorslink":null,"tags":["Serverless","重试策略"],"keywords":null,"outdated":null},"wordCount":{"words":199,"sentences":40,"paragraphs":40},"fileAbsolutePath":"/opt/build/repo/content/best-practice/2021-02-04-scf-asynchronous.md","fields":{"slug":"/best-practice/2021-02-04-scf-asynchronous/","keywords":["serverless","云函数","重试","调用","错误","异步","函数","配置","并发","超限"]},"html":"

在函数调用的过程中，可能有多种原因导致函数调用失败。不同的错误类型以及调用方式（同步调用、异步调用）都会影响重试策略。实际业务生产中，有很多开发者对这里的策略有疑惑，本文将全面解读 Serverless 异步队列重试策略，并对多种使用场景提供相关的配置建议。

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错误类型

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在函数调用的过程中，可能有多种原因导致函数调用失败。错误类型分为以下几类：

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调用错误

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调用错误发生在函数实际执行前。以下情形均会产生调用错误：

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运行错误

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运行错误发生在函数实际运行中。运行错误有以下情形：

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系统错误

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函数平台的错误，例如 internal error。

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重试策略

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不同错误类型以及调用方式（同步调用、异步调用）都会影响重试策略。

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同步调用

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同步调用包含 云 API 触发器 的同步调用、API 网关触发器 及 CKafka 触发器。\n由于同步调用的过程中，错误信息会直接返回给用户，所以在同步调用中发生错误时，平台不会自动重试，重试策略（是否重试、重试几次）均由调用方决定。

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异步调用

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异步调用包含 云 API 触发器 的异步调用、COS 触发器、定时触发器 及 CMQ Topic 触发器 等，具体触发器调用类型请参考相关触发器说明文档。\n在新版重试策略中，开发者可以根据业务诉求在函数配置中修改和自定义默认的【重试次数】，【最长等待时间】配置，该配置只适用于异步调用场景。

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异步调用发生各种错误类型的重试策略：

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错误重试配置建议

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总结

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目前重试可配置已全量开放，通过重试策略配置的能力，可根据业务需求自行配置重试策略。平台的默认重试策略可满足大多数开发者错误重试的诉求，更多异步队列重试配置能力建设请关注微信号或官网产品动态。

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传送门：

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欢迎访问：Serverless 中文网，您可以在 最佳实践 里体验更多关于 Serverless 应用的开发！

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