Bedrock keeps responding with 503 Error (Service unavailable)

Question

My team has started using Bedrock (Claude 3.5 sonnet) (calling from Lambda) since last week. The issue is that from yesterday, Bedrock keeps responding with 503 Error (Service unavailable), while it sometimes works well. (More 503 than 200).
We do understand that there is a runtime limit per minute, and we have confirmed that the limit has not been reached yet. We have no idea on what's causing this.
Does anyone have experience encountering the same issue?
Any possible solutions / reasons are highly appreciated!

Daher · Answer

Hi there!

A 503 error generally indicates that the service is temporarily unavailable, which can be frustrating when you're within your usage limits. **Here are a few things to consider:**

**Regional Availability:** Make sure you're using Bedrock in a region where it's fully supported. Sometimes, 503 errors can occur if the service is experiencing high demand in a particular region.

**Concurrency Limits:** Even if you're within your overall rate limits, you might be hitting concurrency limits. Bedrock has limits on the number of concurrent requests. Consider staggering your Lambda invocations to see if that reduces the frequency of 503 errors.

**Retry Logic:** Implement exponential backoff in your Lambda function. This means that if you receive a 503 error, your function waits a little longer before trying again. This can help manage temporary service issues.

You can find more details on handling AWS service limits and errors in the [AWS documentation about service quotas](https://docs.aws.amazon.com/general/latest/gr/aws_service_limits.html).

I hope this helps! 😁

Bedrock keeps responding with 503 Error (Service unavailable)

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