Shared infrastructure

A multi-tenant infrastructure or shared infrastructure refers to an infrastructure where multiple applications of different customers (or tenants) are being run on the same machine. It is a very well-known strategy to achieve the economy of scale benefits that I mentioned earlier as well. This could be a concern from a business perspective since serverless applications can run alongside one another regardless of business ownership. Although this doesn't affect the code, it does mean the same availability and scalability will be provided across competitors. There could be situations where your code might be affected as well due to noisy neighbors (high load generating function). A multi-tenant infrastructure also has problems related to security and robustness, where one customer's function can take down another customer's function.

This problem is not unique to serverless offerings—they exist in many other service offerings that use multi-tenancy, such as Amazon EC2 and container platforms.