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Documentation | 2025.2

# Check the queue workers

- P4 Code Review package installations are automatically configured with a cron job to spawn workers when you run the configure-swarm.sh post-installation configuration script during installation.
- P4 Code Review tarball installations should be setup with a cron job to ensure that workers are running to process events, this is part of the normal installation process. For information on setting up a cron job to spawn workers, see Set up a recurring task to spawn workers.

P4 Code Review uses a custom queue system to process events, provide notifications, and more. The queue system is required to handle the potentially large volume of events from a busy P4 Server. A queue manager ensures that sufficient queue workers are available to process items.

You can check your queue workers in the following ways:

- If you do not have admin or super user permissions, see HTTP request
- If you have admin or super user permissions, see System information page

## HTTP request

Check the status of the queue by making an HTTP request to `/queue/status`. The response is formatted in JSON and looks like this:

    {"tasks":0,"futureTasks":1,"workers":3,"maxWorkers":3,"workerLifetime":"595s"}

This response indicates that the queue has no current tasks, there is 1 task scheduled for processing later, there are 3 queue workers available, at most 3 workers are created, and queue workers run for at most 10 minutes before self-terminating.

If the queue manager has stopped for some reason, start a new one by making an HTTP request to `/queue/worker`. No response is provided for this request.

## System information page

The Queue info tab on the System Information page displays P4 Code Review basic queue worker information. As well as displaying worker information you can also display the task queue, start a worker, and start a temporary worker.

To navigate to the Queue Info tab:

1. Click your User id avatar, to the right of the P4 Code Review header.
2. Click About Swarm.
3. Click System Information.
4. Click the Queue Info tab.

5. For information about the Queue Info tab, see Queue Info.

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