我们可以配置对 AWS Go SDK 服务调用的重试尝试吗

Question

AWS 默认为其服务调用提供重试支持，通常设置为最多 3 次尝试。

我们可以配置重试对象以将重试次数设置为 5 次吗？

Answer 1

您可以定义一个custom retry strategy供SDK使用：

func main() {
    sess := session.Must(
        session.NewSession(&aws.Config{
            // Use a custom retryer to provide custom retry rules.
            Retryer: CustomRetryer{
                DefaultRetryer: client.DefaultRetryer{
                    NumMaxRetries: client.DefaultRetryerMaxNumRetries,
                }},

            // Use the SDK's SharedCredentialsProvider directly instead of the
            // SDK's default credential chain. This ensures that the
            // application can call Config.Credentials.Expire. This  is counter
            // to the SDK's default credentials chain, which  will never reread
            // the shared credentials file.
            Credentials: credentials.NewCredentials(&credentials.SharedCredentialsProvider{
                Filename: defaults.SharedCredentialsFilename(),
                Profile:  "default",
            }),
            Region: aws.String(endpoints.UsWest2RegionID),
        }),
    )
    // Add a request handler to the AfterRetry handler stack that is used by the
    // SDK to be executed after the SDK has determined if it will retry.
    // This handler forces the SDK's Credentials to be expired, and next call to
    // Credentials.Get will attempt to refresh the credentials.
    sess.Handlers.AfterRetry.PushBack(func(req *request.Request) {
        if aerr, ok := req.Error.(awserr.RequestFailure); ok && aerr != nil {
            if aerr.Code() == "InvalidClaimException" {
                // Force the credentials to expire based on error code.  Next
                // call to Credentials.Get will attempt to refresh credentials.
                req.Config.Credentials.Expire()
            }
        }
    })

See the sample code here

Answer 2

是的，AWS 支持配置其重试和超时功能。以下是在 AWS Golang SDK v2 中将最大重试次数增加到 5 的两种方法：

在 AWS Config 对象 cfg 上配置重试逻辑，它可以使用 NewFromConfig 函数与各种 AWS 服务客户端一起使用

cfg, err := config.LoadDefaultConfig(context.TODO(), config.WithRetryer(func() aws.Retryer {
    return retry.AddWithMaxAttempts(retry.NewStandard(), 5)
}))

client := s3.NewFromConfig(cfg)

仅为特定的 AWS 服务客户端配置重试逻辑

customRetry := retry.NewStandard(func(o *retry.StandardOptions) {
        o.MaxAttempts = 5
    })

sqsClient := sqs.NewFromConfig(creds,
    func(o *sqs.Options) {
        o.Retryer = customRetry
    },
)

可以在 https://aws.github.io/aws-sdk-go-v2/docs/configuring-sdk/retries-timeouts/ and https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/aws/retry#hdr-Standard

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我们可以配置对 AWS Go SDK 服务调用的重试尝试吗

Can we configure retry attempts on AWS Go SDK service calls

go

amazon-web-services

aws-sdk

retry-logic

aws-config