hystrixCommand annotation - what is purpose of commandKey

Question

Using spring's Hystrix annotation described here

I want to know what the commandKey param is. In the following context i want to know what this parameter means:

   @HystrixCommand(groupKey="UserGroup", commandKey = "GetUserByIdCommand")
public User getUserById(String id) {
    return userResource.getUserById(id);
}

notice the commandKey here is defined as GetUserByIdCommand , does this have anything to do with thread pools ? Does it mean that anything with that command key uses the same thread pool and if so does that mean that its good practice for every single method i have with a failback to have its own commandKey ?

I have about 8 classes that i want to annotate methods within. I will annotate a few of the class methods with this but im wondering how to structure the commandKeys ? should i use all the same ones , or same per class or all unique etc.

Answer 1

finally found the answer. CommandKey is used for.

By default the name of command key is command method name: For example , getUserById but you can rename it to getUserByIdCommand

Then you can use the commandKey in hystrix commands to reference the methods. If you dont use the commandKey (its optional). then the method name is used as default. So its just to rename the command.

I found all this info here