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Which approach allows a LangChain chain to retry a failed step up to three times before raising an error?

hard📝 Application Q9 of 15
LangChain - LangSmith Observability
Which approach allows a LangChain chain to retry a failed step up to three times before raising an error?
ASet <code>chain.retry_attempts=3</code> before running the chain
BWrap the chain call in a loop with try-except and retry logic
CUse <code>chain.enable_auto_retry(True)</code> to activate retries
DAdd a <code>max_retries=3</code> parameter to the chain constructor
Step-by-Step Solution
Solution:

  1. Step 1: Understand LangChain retry capabilities

    LangChain does not provide built-in retry parameters like retry_attempts or max_retries.

  2. Step 2: Implement manual retry logic

    Wrapping the chain call in a loop with try-except allows retrying failed steps up to a set number of attempts.

  3. Final Answer:

    Wrap the chain call in a loop with try-except and retry logic -> Option B

  4. Quick Check:

    Manual retry requires explicit loop and exception handling [OK]
Quick Trick: Retries require explicit try-except loops in LangChain [OK]
Common Mistakes:
MISTAKES
  • Assuming LangChain has built-in retry parameters
  • Using non-existent methods like enable_auto_retry
  • Setting retry parameters in constructor which are unsupported

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