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Earlier today I noticed the following error in my logs:

503 Too many outstanding pull requests for subscription '<...>'.
Please reduce the number of simultaneous Pull() requests invoked for
this subscription. (POST https://pubsub.googleapis.com/v1/projects/<...>:pull)

I tried searching for the exact quantity of allowed simultaneous pull requests, but can't seem to find it anywhere. The only mention of this error I find is here in the docs, but again, no numbers are stated.

I have 40 processes pulling from the subscription.

Gilles Jacobs
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1 Answers1

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This error happens when there is a transient overload on a specific instance of a Cloud Pub/Sub server to which some of your requests are being routed. The error message is admittedly poor and should not tell you to reduce your pull requests and I will remedy that.

Kamal Aboul-Hosn
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