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Applies to:


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Summary

Issue: Evaluator invocations fail with 403 Forbidden errors from CloudFront when processing large inputs. Evaluations hang indefinitely on rows with high token counts before failing. Cause: CloudFront’s origin_read_timeout is set to 60 seconds, causing requests to fail when scorers take longer to process large payloads. Resolution: Reduce input size to scorers or configure CloudFront timeout settings in your Terraform deployment.

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Resolution Steps

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Immediate workaround: Reduce scorer input size

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Step 1: Limit tokens sent to scorers

Reduce the amount of data sent to individual scorers, especially for informational scorers that are not critical to evaluation results.

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Step 2: Split evaluations into smaller batches

Break large evaluations into multiple smaller runs to avoid timeout thresholds.