How a wrong carrier implementation causes a server outage
Sometimes one wrong line of code can break your site. In the following I will describe a mistake in a Magento 2 custom carrier implementation, which causes a massive overloading of server resources (CPU, RAM, DB processes) and even can cause an outage of your Magento store. The one line of code The following line of code is the reason for the problems, if used in the collectRates() method, or in methods, called from collectRates() in the Carrier class: $quote…