Start message queue consumers

In addition to the command arguments described in this topic, see Common arguments.

Run all Magento CLI commands as the Magento file system owner.

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.

View a list of available message queue consumers

To view a list of all consumers:

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bin/magento queue:consumers:list

Start message queue consumers

To start message queue consumers:

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bin/magento queue:consumers:start [--max-messages=<value>] [--batch-size=<value>] [--single-thread] [--area-code=<value>] <consumer_name>

The following table explains this command’s options, parameters, and values.

Parameter Value Required? Default Value
--max-messages=<value> The maximum number of messages to consume per invocation. If the number of queued messages is less than the specified max, the consumer polls for new messages until it has processed the max. If you don’t specify --max-messages, the process runs continuously. No 0
--batch-size=<value> The number of messages to consume per batch. If specified, messages in a queue are consumed in batches of <value> each. This option is applicable for the batch consumer only. If --batch-size is not defined, the batch consumer receives all available messages in a queue. No 0
--pid-file-path=<value> This option is deprecated. Use the single-thread option instead. No  
--single-thread This option prevents running multiple copies of a consumer simultaneously. No  
--area-code=<value> The area code preferred for consumer process. No global
<consumer_name> The consumer to start. Yes  

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:

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bin/magento queue:consumers:start <consumer_name> &

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