Concurrency
This principle, as per the original 12, describes the requirement for an application be scaled horizontally, using principles 12 and 7. In doing so, this will result in processes that share nothing, stateless and disposable, which make them prime candidates for efficient horizontal scaling. The alternative to horizontal scaling is vertical scaling, whereby an application's underlying server/system is scaled by increasing its CPU or RAM. In general, the stateless processes follow a Unix process model that enable developers to architect their application in such a way that enables them to divide the workloads as separate independent programs and scale them accordingly (https://en.wikibooks.org/wiki/A_Quick_Introduction_to_Unix/Files_and_Processes ...
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