RetryToken: expose attempts, scope and status

[elruwen]

Describe the feature

Hi!

I want the RetryToken class to expose the fields attempt count, scope and status so I can get visibility when a retry is happening.

Cheers Ruwen

Use Case

I am currently migrating from the SDK v1. In the SDK v1 I got custom retry condition which extends PredefinedRetryPolicies.SDKDefaultRetryCondition.

I do that in order to log retries:

    public boolean shouldRetry(AmazonWebServiceRequest originalRequest, AmazonClientException exception, int retriesAttempted) {
        boolean retry = super.shouldRetry(originalRequest, exception, retriesAttempted);
        String source = originalRequest.getClass().getSimpleName();
        LOGGER.warn("Retrying: {}, Retry Attempt: {}, Source: {}, Exception: {}", retry, retriesAttempted, source, exception.getMessage());
        return retry;
    }

In the past that has been quite helpful and so I want to keep that behaviour.

Currently the RetryToken doesn't expose any fields. If I log toString() on the retry token, then the log message is way to verbose.

Proposed Solution

Expose the fields:

• attempts
• state
• scope

Other Information

No response

Acknowledgements

• [x] I may be able to implement this feature request
• [ ] This feature might incur a breaking change

AWS Java SDK version used

2.29.52

JDK version used

17

Operating System and version

Debian stable

[debora-ito]

@elruwen sorry for the long silence.

The attempts will show up as suppressed exceptions if WARN logging is used, like:

Caused by: software.amazon.awssdk.core.exception.SdkClientException: Unable to execute HTTP request: s3.not-a-real-region.amazonaws.com (SDK Attempt Count: 4)
	at software.amazon.awssdk.core.exception.SdkClientException$BuilderImpl.build(SdkClientException.java:130)
	at software.amazon.awssdk.core.exception.SdkClientException$BuilderImpl.build(SdkClientException.java:95)
	at software.amazon.awssdk.core.internal.http.pipeline.stages.utils.RetryableStageHelper.retryPolicyDisallowedRetryException(RetryableStageHelper.java:168)
	at software.amazon.awssdk.core.internal.http.pipeline.stages.RetryableStage.execute(RetryableStage.java:73)
	at software.amazon.awssdk.core.internal.http.pipeline.stages.RetryableStage.execute(RetryableStage.java:36)
	at software.amazon.awssdk.core.internal.http.pipeline.RequestPipelineBuilder$ComposingRequestPipelineStage.execute(RequestPipelineBuilder.java:206)
	at software.amazon.awssdk.core.internal.http.StreamManagingStage.execute(StreamManagingStage.java:53)
	at software.amazon.awssdk.core.internal.http.StreamManagingStage.execute(StreamManagingStage.java:35)
	at software.amazon.awssdk.core.internal.http.pipeline.stages.ApiCallTimeoutTrackingStage.executeWithTimer(ApiCallTimeoutTrackingStage.java:82)
	at software.amazon.awssdk.core.internal.http.pipeline.stages.ApiCallTimeoutTrackingStage.execute(ApiCallTimeoutTrackingStage.java:62)
	at software.amazon.awssdk.core.internal.http.pipeline.stages.ApiCallTimeoutTrackingStage.execute(ApiCallTimeoutTrackingStage.java:43)
	at software.amazon.awssdk.core.internal.http.pipeline.stages.ApiCallMetricCollectionStage.execute(ApiCallMetricCollectionStage.java:50)
	at software.amazon.awssdk.core.internal.http.pipeline.stages.ApiCallMetricCollectionStage.execute(ApiCallMetricCollectionStage.java:32)
	at software.amazon.awssdk.core.internal.http.pipeline.RequestPipelineBuilder$ComposingRequestPipelineStage.execute(RequestPipelineBuilder.java:206)
	at software.amazon.awssdk.core.internal.http.pipeline.RequestPipelineBuilder$ComposingRequestPipelineStage.execute(RequestPipelineBuilder.java:206)
	at software.amazon.awssdk.core.internal.http.pipeline.stages.ExecutionFailureExceptionReportingStage.execute(ExecutionFailureExceptionReportingStage.java:37)
	... 38 more
	Suppressed: software.amazon.awssdk.core.exception.SdkClientException: Request attempt 1 failure: Unable to execute HTTP request: s3.not-a-real-region.amazonaws.com: nodename nor servname provided, or not known
	Suppressed: software.amazon.awssdk.core.exception.SdkClientException: Request attempt 2 failure: Unable to execute HTTP request: s3.not-a-real-region.amazonaws.com
	Suppressed: software.amazon.awssdk.core.exception.SdkClientException: Request attempt 3 failure: Unable to execute HTTP request: s3.not-a-real-region.amazonaws.com

DEBUG-level logging will also show the retry attempt number with additional info - example:

2025-04-29 13:31:28,156 [main] DEBUG software.amazon.awssdk.retries.LegacyRetryStrategy:85 - Request attempt 3 token acquired (backoff: 35ms, cost: 5, capacity: 490/500)
2025-04-29 13:31:28,156 [main] DEBUG software.amazon.awssdk.request:96 - Retryable error detected. Will retry in 35ms. Request attempt number 2
software.amazon.awssdk.core.exception.SdkClientException: Unable to execute HTTP request: s3.not-a-real-region.amazonaws.com
	at software.amazon.awssdk.core.exception.SdkClientException$BuilderImpl.build(SdkClientException.java:130)
	at software.amazon.awssdk.core.exception.SdkClientException.create(SdkClientException.java:47)
	...

I'm not quite sure what "state" and "scope" mean in this context, but maybe they are covered in the DEBUG logs?

Let us know if this is what you're looking for.

[elruwen]

Hi @debora-ito,

which class is producing those logs?

I got a custom retry strategy and nothing is logged. In the BaseRetryStrategy I can see only debug logs. I don't want to enable debug logs since it is way to verbose.

About the fields: They are all in the class software.amazon.awssdk.retries.internal.DefaultRetryToken but the API is only exposing the interface RetryToken.

[debora-ito]

Can you share a code snippet showing how you create the custom retry strategy, so I can run it locally?

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[elruwen]

Sorry for the delay. I hope that is enough, otherwise I will make you a maven project.

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import software.amazon.awssdk.retries.api.AcquireInitialTokenRequest;
import software.amazon.awssdk.retries.api.AcquireInitialTokenResponse;
import software.amazon.awssdk.retries.api.RecordSuccessRequest;
import software.amazon.awssdk.retries.api.RecordSuccessResponse;
import software.amazon.awssdk.retries.api.RefreshRetryTokenRequest;
import software.amazon.awssdk.retries.api.RefreshRetryTokenResponse;
import software.amazon.awssdk.retries.api.RetryStrategy;


public class LoggingRetryStrategy implements RetryStrategy {
    private static final Logger LOGGER = LoggerFactory.getLogger(LoggingRetryStrategy.class);

    private final RetryStrategy delegate;

    public LoggingRetryStrategy(RetryStrategy delegate) {
        this.delegate = delegate;
    }

    @Override
    public AcquireInitialTokenResponse acquireInitialToken(AcquireInitialTokenRequest request) {
        return delegate.acquireInitialToken(request);
    }

    @Override
    public RefreshRetryTokenResponse refreshRetryToken(RefreshRetryTokenRequest request) {
        // TODO this quite verbose at the moment...
        // see https://github.com/aws/aws-sdk-java-v2/issues/5818
        LOGGER.warn("Retrying: {} Exception: {}", request.token(), request.failure().getMessage());
        return delegate.refreshRetryToken(request);
    }

    @Override
    public RecordSuccessResponse recordSuccess(RecordSuccessRequest request) {
        return delegate.recordSuccess(request);
    }

    @Override
    public int maxAttempts() {
        return delegate.maxAttempts();
    }

    @Override
    public boolean useClientDefaults() {
        return delegate.useClientDefaults();
    }

    @Override
    public Builder<?, ?> toBuilder() {
        return delegate.toBuilder();
    }
}

[elruwen]

Any update on this?