Set customBackoff for AWS SDK JavaScript V3 retries

Question

I just upgraded to AWS SDK V3 and I have no idea how to configure retryDelayOptions and customBackoff with it. I couldn't find any example code in AWS's own API reference or online. This is what I was doing previously:

retryDelayOptions: { customBackoff: (retryCount) => 2 ** (retryCount * 100) },
maxRetries: 2

I was passing the above as options into the client constructor. The retries seems to have changed quite a bit with V3 and I cannot make sense of the API without any examples. Any help is much appreciated

Regards, Deepak

Note that `^` is a bitwise operator - I believe you intended to use `**` — Gershom Maes, Aug 29 '23 at 19:24

score 3 · Answer 1 · edited Aug 29 '23 at 19:24

3

I think I figured it out

const { StandardRetryStrategy } = require("@aws-sdk/middleware-retry");

module.exports = (maxAttempts)  => 
    new StandardRetryStrategy(async () => maxAttempts, {
    // eslint-disable-next-line no-bitwise
        delayDecider: (delayBase, attempts) => 2 ** (attempts * 100)
    })

and then you can pass this as retryStrategy

edited Aug 29 '23 at 19:24

Gershom Maes

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answered Mar 10 '22 at 19:34

Deepak Thankachan Mathews

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Thanks! Unfortunately, the api is deprecated. You should now use [@aws-sdk/util-retry](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/modules/_aws_sdk_util_retry.html) instead. But looking at the docs there, it is not obvious how to configure custom backoff. – Philipp Just Apr 19 '23 at 07:00
Note that `^` is a bitwise operator - I believe you intended to use `**` – Gershom Maes Aug 29 '23 at 19:24

score 0 · Answer 2 · answered May 17 '23 at 01:31

As @philipp commented, the @aws-sdk/middleware-retry lib is deprecated, the way to set it up right now it is using @aws-sdk/util-retry lib.

To configure it can be found here

import { S3Client } from "@aws-sdk/client-s3";
import { ConfiguredRetryStrategy } from "@aws-sdk/util-retry";

const client = new S3Client({
  retryStrategy: new ConfiguredRetryStrategy(
    4, // max attempts.
    (attempt: number) => 100 + attempt * 1000 // backoff function.
  ),
});

Set customBackoff for AWS SDK JavaScript V3 retries

2 Answers2