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@smithy/util-retry
This package provides shared utilities for retries.
Usage
Default
By default, each client already has a default retry strategy. The default retry count is 3, and only retryable errors will be retried.
AWS Documentation: Retry behavior.
import { S3Client } from "@aws-sdk/client-s3";
const client = new S3Client({}); // default retry strategy included.
MaxAttempts
If you want to change the number of attempts, you can provide maxAttempts configuration during client creation.
import { S3Client } from "@aws-sdk/client-s3";
const client = new S3Client({ maxAttempts: 4 });
This is recommended because the StandardRetryStrategy includes backoff calculation,
deciding whether an error should be retried, and a retry token counter.
MaxAttempts and BackoffComputation
If you want to change the number of attempts and use a custom delay
computation, you can use the ConfiguredRetryStrategy from @smithy/util-retry.
import { S3Client } from "@aws-sdk/client-s3";
import { ConfiguredRetryStrategy } from "@smithy/util-retry";
const client = new S3Client({
retryStrategy: new ConfiguredRetryStrategy(
4, // max attempts.
(attempt: number) => 100 + attempt * 1000 // backoff function.
),
});
This example sets the backoff at 100ms plus 1s per attempt.
MaxAttempts and RetryStrategy
If you provide both maxAttempts and retryStrategy, the retryStrategy will
get precedence as it's more specific.
import { S3Client } from "@aws-sdk/client-s3";
import { ConfiguredRetryStrategy } from "@smithy/util-retry";
const client = new S3Client({
maxAttempts: 2, // ignored.
retryStrategy: new ConfiguredRetryStrategy(
4, // used.
(attempt: number) => 100 + attempt * 1000 // backoff function.
),
});
Further customization
You can implement the RetryStrategyV2 interface.
Source: https://github.com/smithy-lang/smithy-typescript/blob/main/packages/types/src/retry.ts API Docs: https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/Package/-smithy-types/Interface/RetryStrategyV2/