PYTHON-5506 Prototype adaptive token bucket retry#2501
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ShaneHarvey merged 5 commits intomongodb:backpressurefrom Aug 22, 2025
Merged
PYTHON-5506 Prototype adaptive token bucket retry#2501ShaneHarvey merged 5 commits intomongodb:backpressurefrom
ShaneHarvey merged 5 commits intomongodb:backpressurefrom
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blink1073
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Aug 21, 2025
pymongo/asynchronous/helpers.py
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| async def should_retry(self, attempt: int) -> bool: | ||
| """Return if we have budget to retry and how long to backoff.""" | ||
| # TODO: Check CSOT deadline here. |
blink1073
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PYTHON-5505 Prototype system overload retry loop for all operations (#2497) All commands that fail with the "Retryable" error label will be retried up to 3 times. When the error includes the "SystemOverloaded" error label we apply exponential backoff with jitter before attempting a retry. PYTHON-5506 Prototype adaptive token bucket retry (#2501) Add adaptive token bucket based retry policy. Successfully completed commands deposit 0.1 token. Failed retry attempts consume 1 token. A retry is only permitted if there is an available token. Token bucket starts full with the maximum 1000 tokens. PYTHON-5505 Use proper RetryableError and SystemOverloadedError labels
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Add adaptive token bucket based retry policy. Successfully completed commands deposit 0.1 token. Failed retry attempts consume 1 token. A retry is only permitted if there is an available token. Token bucket starts full with the maximum 1000 tokens.
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…)" This reverts commit 1820f97.
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PYTHON-5506 Prototype adaptive token bucket retry
Description:
Add adaptive token bucket based retry policy.
Successfully completed commands deposit 0.1 token.
Failed retry attempts consume 1 token.
A retry is only permitted if there is an available token.
For simplicity, this POC adds a retry bucket per MongoClient. In the future we will consider adding a retry bucket per server.
Patch with perf benchmarks: https://spruce.mongodb.com/version/68a7b69b74baee000728de31/tasks