What's the best practice to for Thrift file (api) versioning?

Question

I have an API written in thrift. Example:

service Api {
  void invoke()
}

It does something. I want to change the behavior to do something else

Answer 1

For your specific scenario, you can just add a new method (named something else) that does the new thing. In the future, I would avoid naming methods invoke or similar for this exact reason. Your service will now have a method invoke that does some unknown thing and another method (hopefully named better) that does what it says it does. This may lead to confusion by your users, but everything will still work.