Concurrency Bugs Can Be Very Hard to Understand

You have to design your system, like knowing that you want to do that from the get go. Concurrency bugs can also be very difficult to understand because multiple parts of an application can be interacting with your database at the same time in ways that you didn't expect. And so those kinds of things, we talk about missed system calls and things like that in your test and not having your system rely on anything, including the clock. Yeah, which is very hard when you're doing multi threaded type stuff. That's not when I spend my time. Right.