fix(bedrock): classify Bedrock throttles as retryable rate limits with exponential backoff - #7417
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…h exponential backoff Resolves crewAIInc#7377 - Add is_bedrock_throttling_error classifier to distinguish throttling/rate-limit exceptions from genuine context window exceeded errors. - Exclude rate limit and throttling phrases (such as 'Too many tokens, please wait before trying again') from context window exhaustion detection. - Add configurable exponential backoff retry mechanism (max_retries, retry_delay, max_retry_delay) with jitter to sync and async Bedrock Converse calls. - Add unit tests covering throttling classification, context window disambiguation, and exponential backoff retry behavior.
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Included review availability: Your plan provides up to 10 included reviews per hour; 8 remain after this review. 📝 WalkthroughWalkthroughBedrock throttling errors now use dedicated classification and jittered bounded exponential backoff. Synchronous, asynchronous, and streaming converse paths retry eligible throttling errors. Context-length detection excludes throttling errors. Tests cover classification, validation, retry behavior, and streaming recovery. ChangesBedrock throttling handling
Sequence Diagram(s)sequenceDiagram
participant BedrockCompletion
participant AWSBedrock
participant ThrottlingClassifier
participant Backoff
BedrockCompletion->>AWSBedrock: Submit converse or converse_stream request
AWSBedrock-->>BedrockCompletion: Return throttling error
BedrockCompletion->>ThrottlingClassifier: Check error
ThrottlingClassifier-->>BedrockCompletion: Confirm throttling
BedrockCompletion->>Backoff: Wait with jittered bounded delay
BedrockCompletion->>AWSBedrock: Retry before output emission
AWSBedrock-->>BedrockCompletion: Return response or final error
Priority: ➖ Normal Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to This change adds Bedrock throttling detection and retry handling. No verified issues were identified in the available review evidence, so the change appears mergeable as reviewed. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Out of Scope Changes checkExplanation The direct synchronous streaming path now invokes
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@lib/crewai/src/crewai/llms/providers/bedrock/completion.py`:
- Around line 365-367: The _calculate_backoff_delay method currently returns
only deterministic exponential backoff, causing concurrent clients to retry
together. Add bounded jitter to the calculated delay while preserving the
existing retry_delay growth and max_retry_delay cap, ensuring the final value
never exceeds max_retry_delay.
- Around line 1060-1068: Update the streaming handlers around _call_with_retry,
_acall_with_retry, and converse_stream so EventStreamError throttlingException
failures during iteration are retried only before any chunk or tool event has
been emitted. Track whether output has been emitted; retry by creating a fresh
stream when none has been emitted, and propagate the original error once output
has started without replaying prior events.
- Around line 250-252: Update BedrockCompletion model validation to reject
negative values for max_retries, retry_delay, and max_retry_delay, ensuring all
three retry settings are non-negative before the retry loop or
_calculate_backoff_delay() uses them.
In `@lib/crewai/src/crewai/llms/providers/bedrock/throttling.py`:
- Around line 54-56: Update the exception classification helper around
BEDROCK_THROTTLING_ERROR_MESSAGES to inspect AWS error codes from the exception
and its __cause__ and __context__ before falling back to string-message pattern
matching; ensure wrapped TooManyRequestsException and ModelNotReadyException
cases with neutral messages are detected, and add a regression test covering
that behavior.
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…, parameter validation, and streaming retry
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Actionable comments posted: 1
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Inline comments:
In `@lib/crewai/src/crewai/llms/providers/bedrock/completion.py`:
- Line 1370: Update BedrockCompletion._handle_streaming_converse so the direct
synchronous path invokes BaseLLM._invoke_after_llm_call_hooks before returning
full_response when no executor context is active, matching the asynchronous
streaming path while leaving executor-side dispatch unchanged.
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Related issue
Fixes #7377
Summary
This PR addresses issue #7377 where AWS Bedrock throttling exceptions (specifically
ThrottlingExceptionwith"Too many tokens, please wait before trying again") were incorrectly classified as context window exhaustion (LLMContextLengthExceededError), triggering context window recovery/summarization instead of retrying with backoff.Changes:
crewai.llms.providers.bedrock.throttling):is_bedrock_throttling_errorhelper to detect Bedrock throttling responses via botocoreClientErrorandEventStreamErrorerror codes (ThrottlingException,TooManyRequestsException,RequestLimitExceeded,ModelNotReadyException) and message patterns.__cause__and__context__exception chains to properly classify wrapped exceptions even when error messages are neutral.crewai.utilities.exceptions.context_window_exceeding_exception&agent_utils):THROTTLING_OR_RATE_LIMIT_INDICATORSto ensure rate-limit and throttling phrases (such as"please wait before trying again") are not misclassified as context-window exhaustion.is_context_length_exceeded()to yieldFalsewhen an exception matchesis_bedrock_throttling_error().crewai.llms.providers.bedrock.completion):max_retries(default: 3),retry_delay(default: 1.0s),max_retry_delay(default: 30.0s) with exponential backoff and bounded jitter.max_retries,retry_delay, andmax_retry_delay.converse) in retry mechanisms (_call_with_retryand_acall_with_retry).converse_stream) with retry before chunks or tool-use events are emitted to avoid event duplication or corrupted replays.is_bedrock_throttling_error()incallandacallbefore falling back tois_context_length_exceeded().tests/llms/bedrock/test_bedrock_throttling.py):Verification
Tests added or updated for the changed behavior
Relevant tests and quality checks pass locally
Unit test suite:
uv run pytest lib/crewai/tests/llms/bedrock/test_bedrock_throttling.py(22 passed, 100%)Linter:
uv run ruff check(passed)Formatter:
uv run ruff format --check(passed)Additional context
None