How to fix CloudRun error 'The request was aborted because there was no available instance'

Question

I'm using managed CloudRun to deploy a container with concurrency=1. Once deployed, I'm firing four long-running requests in parallel. Most of the time, all works fine -- But occasionally, I'm facing 500's from one of the nodes within a few seconds; logs only provide the error message provided in the subject.

Using retry with exponential back-off did not improve the situation; the retries also end up with 500s. StackDriver logs also do not provide further information.

Potentially relevant gcloud beta run deploy arguments:

--memory 2Gi --concurrency 1 --timeout 8m --platform managed

What does the error message mean exactly -- and how can I solve the issue?

Answer 1

This error message can appear when the infrastructure didn't scale fast enough to catch up with the traffic spike. Infrastructure only keeps a request in the queue for a certain amount of time (about 10s) then aborts it.

This usually happens when:

1. traffic suddenly largely increase
2. cold start time is long
3. request time is long