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During this year I noticed 2 similar concurrency problems with my Ruby on Rails application and I solved them with distributed locks. I’m going to show you how to detect if your application might have a concurrency problem and how to solve it.
I like tests. You may like them too because thanks to them you are not afraid to change the code. Tests can help you catch errors earlier. I like tests, even more, when they are fast.
If you want to help with this documentation you may want to take a look at the repository