Start message queue consumers
You must start a message queue consumer to enable asynchronous operations such as Inventory Management mass actions and REST bulk and asynchronous endpoints. To enable B2B functionality, you must start multiple consumers. Third-party modules might also require that you start a custom consumer.
To view a list of all consumers:
bin/magento queue:consumers:list
To start message queue consumers:
bin/magento queue:consumers:start [--max-messages=<value>] [--batch-size=<value>] [--single-thread] [--area-code=<value>] [--multi-process=<value>] <consumer_name>
After consuming all available messages, the command terminates. You can run the command again manually or with a cron job. You can also run multiple instances of the magento queue:consumers:start command to process large message queues. For example, you can append & to the command to run it in the background, return to a prompt, and continue running commands:
bin/magento queue:consumers:start <consumer_name> &
See queuestart in the Commerce section of the Command-line tools reference for details about the command options, parameters, and values.
--multi-process option is present in the queue:consumers:start command, but to run consumers with parallel processes, configure the multiple_processes option in /app/etc/env.php. Otherwise, if queue:consumers:start is called with the --multi-process option, it only works on a single thread.