Another consideration is deployment. If you have persistent state in your application, you’ve essentially made your application a database. The way you database is very different from the way you deploy an application with no persistent state. There’s a concept called Pets vs Cattle, where Pets are special applications that need a lot of criteria to be true. For example, if you’re using disk based persistence, then if you roll that application, you’ll want it to have access to the same disk on reboot. Cattle, applications without persistent state, can be killed and booted anywhere.
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