feat(retry): restore legacy uipath-langchain-python chat-client retry parity#107
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…orts The RetryableHTTPTransport defaults were materially weaker than the legacy uipath-langchain-python chat-client retryers (BedrockRetryer) they replaced: 3 attempts / ~6s absorption window vs 5 attempts / ~75s, Retry-After honored only on 429, no 524, no connection-error retries. Throttling episodes the legacy client absorbed silently now surface as run failures - on the Bedrock path (pre-uipath-langchain-client 1.14.1) as the misleading "No 'output' key found in the response from the Bedrock Converse API" error. uipath-llm-client 1.17.0: - Default budget: 5 attempts, backoff 5s initial / 120s cap (~5/10/20/40s) - Retry-After / x-retry-after honored on any error status: caps the wait for every UiPathAPIError and forces a retry even on otherwise non-retryable statuses (explicit server retry request); retry_after moved from UiPathRateLimitError up to UiPathAPIError - HTTP 524 retryable again via new UiPathOriginTimeoutError; 529 kept - httpx ConnectError / ConnectTimeout / ReadTimeout retried (botocore equivalents were retried by the legacy retryer) uipath-langchain-client 1.17.0: - UiPathBaseLLMClient.max_retries default 3 -> 5; requires uipath-llm-client>=1.17.0 Note: uipath-langchain's chat_model_factory still passes max_retries=3 explicitly on the new-clients path; a companion bump there is needed for agent runs to get the full 5-attempt budget. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Clarified the retry behavior and budget for the BedrockRetryer, including changes to retry attempts, backoff timings, and error handling. Signed-off-by: Vlad Cimpeanu <vlad.cimpeanu@uipath.com>
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The legacy Vertex retryer retried httpx.TimeoutException (all timeout subtypes, including WriteTimeout and PoolTimeout) and RemoteProtocolError (connection reset mid-exchange); the initial parity commit only covered ConnectTimeout/ReadTimeout/ConnectError. Replace the two timeout subclasses with the TimeoutException base and add RemoteProtocolError. PoolTimeout matters under high request concurrency; RemoteProtocolError is the shape of mid-flight connection resets. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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cosminacho
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Summary
The
RetryableHTTPTransportdefaults are materially weaker than the legacy uipath-langchain-python chat-client retryers (BedrockRetryer) they replaced. Retryable episodes the legacy client absorbed silently now surface as run failures.UiPathOriginTimeoutError)ConnectError/RemoteProtocolErroron Vertex)TimeoutExceptionincl. pool/write,ConnectError,RemoteProtocolError)Changes
uipath-llm-client 1.17.0
_DEFAULT_MAX_RETRIES3→5, initial delay 2s→5s, max delay 60s→120sretry_any(typed exceptions, server-requested-retry)— anyUiPathAPIErrorcarrying Retry-After is retried regardless of statusretry_afterproperty moved fromUiPathRateLimitErrorup toUiPathAPIError; wait strategy honors it for every API error (capped at max delay)UiPathOriginTimeoutError(524) in the taxonomy, mapped and exported; 529 unchangedhttpx.TimeoutException(all timeout subtypes, incl.PoolTimeoutunder high concurrency),httpx.ConnectError, andhttpx.RemoteProtocolError(mid-exchange connection reset) — the union of what the legacy Bedrock and Vertex retryers handleduipath-langchain-client 1.17.0
UiPathBaseLLMClient.max_retriesdefault 3→5; dependency floor bumped touipath-llm-client>=1.17.0Not in this PR (follow-ups)
uipath-langchain'schat_model_factorystill passesmax_retries=3explicitly on the new-clients path — companion bump needed in uipath-langchain-python for agent runs to get the 5-attempt budget (backoff window, Retry-After, 524 and connection-error behavior from this PR apply regardless).Test plan
tests/core/features/test_retry.py: full default retry set pinned, Retry-After honored on any status, 403+Retry-After retried / plain 403 not, 524 retried, connect errors / pool timeouts / remote-protocol errors retried then raised, default 5-attempt budget end-to-end🤖 Generated with Claude Code