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f50dbbb | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | # Issue
**Title:** [v2] Update standard retry mode via opt-in env var
## Description
*Notes:*
* Ports to vendored botocore. The main and only difference from upstream botocore is that AWS CLI v2 uses `standard` retry mode by default, but upstream botocore uses `legacy`.
*Description of changes:*
* Introduced new `AWS_NEW_RETRIES_2026` environment variable. When set to true, standard retry mode behavior is changed.
* The standard retry mode behavior changes (gated behind the new env var) is described below:
* **Service-specific max attempts** — Service-defined (e.g., DynamoDB with 4 attempts) max attempt values instead of the universal default of 3, but only if the user hasn't explicitly configured max attempts.
* **Throttling-aware backoff** — The ExponentialBackoff is initialized with a `throttling_detector` and `service_name`, enabling it to use different backoff scales depending on whether the error is a throttling error and which service is being called (e.g., 25ms base for DynamoDB non-throttling errors vs. 50ms for other services vs. 1s for throttling errors).
* **Throttling-aware retry quota** — The RetryQuotaChecker receives a throttling_detector, allowing it to deduct a smaller quota cost (5) for throttling errors vs. the standard cost (14) for other retryable errors.
* **Service name passed to RetryHandler** — For known long-polling operations (e.g., `SQS ReceiveMessage`, `SFN GetActivityTask`), when retry quota is exhausted the handler sleeps the backoff delay before returning without retrying.
* Added new test cases for the new standard retry mode behavior updates.
*Description of tests:*
* Successfully ran pre-production build workflow (see Build Internal GitHub Action).
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## Task
Modify the repository so that the issue described above is resolved. The repository is checked out at base commit `bdf748564bd6`. Edit files in place; the verifier captures your changes via `git diff` and scores them against an oracle patch using SWE-RL-style diff-similarity reward. |