Testing Push Queues in the Development Server

This API is supported for first-generation runtimes and can be used when upgrading to corresponding second-generation runtimes. If you are updating to the App Engine Go 1.12+ runtime, refer to the migration guide to learn about your migration options for legacy bundled services.

This page describes some limitations with using the local development server (dev_appserver) to test push queues in your application. In most respects, you set up your queues and tasks just as you would to run them in the App Engine production environment, but there are some differences:

• The development server doesn't respect the rate and bucket-size attributes of your queues. As a result, tasks are executed as close to their ETA as possible. Setting a rate of 0 doesn't prevent tasks from being executed automatically.
• The development server doesn't preserve queue state across restarts.

Important: Before running the local development server, follow the setup instructions. Regardless of your app's runtime or language version, you must run dev_appserver.py with Python 3 and set the CLOUDSDK_DEVAPPSERVER_PYTHON environment variable in your shell to the path of your Python 2 interpreter.

To prevent push tasks from running in the development server at all, use the following command:

python3 CLOUD_SDK_ROOT/bin/dev_appserver.py --enable_task_running no

For more detailed information on the options available using the local development server, see here.