CODEWITHSUNDEEP
google-app-engine
minou
minou

Reputation: 16563

GAE push queue with max_concurrent_requests

I want to set up a push queue with max_concurrent_requests set to 1. So I created a queue.yaml like this:

queue:
- name: myqueue
  max_concurrent_requests: 1

When running in the dev server, I get the error: 

root: WARNING: Refill rate must be specified for push-based queue. Please check queue.yaml file.

Doing a Google search for "refill rate" and queue.yaml doesn't give any relevant hits except for the taskqueue stub, which doesn't help me.

Changing queue.yaml to this:

queue:
- name: myqueue
  max_concurrent_requests: 1
  rate: 10/s

Gets rid of the error in the dev server. Can anyone confirm that this will actually create a queue with a max of 1 concurrent request? (ok, that it is also limited to 10 per second) I'm suspicious because the queue.yaml documentation doesn't address this.

Upvotes: 1

Views: 409

Answers (1)

minou
minou

Reputation: 16563

Although not specified in the documentation, you must specify a "rate" when creating a queue. To achieve 1 maximum concurrent request, you can simply set a high rate, and the rate will essentially be ignored. My tasks take about 0.25 seconds (i.e., 4/s) so a rate of 10/s makes sure that the rate does not impact task execution.

Upvotes: 2

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