Are ordinary functions blocking in meteor?

[sashko]

This is a very similar thread, I’d suggest reading it:

Preventing method calls to server from running async

Two different clients can call the same method, myMethod. Suppose they call the method at roughly the same time, but client B’s gets handled first. I don’t want client A’s call to get handled until client B’s handler has exited. I know that on a PER CLIENT basis, method calls are executed synchronously, by default (unless we manually this.unblock). I am wondering if this is true across all clients at the same time. As a bonus, how can this behavior be extended for clustered environments?

Basically, since you’re going to be running multiple servers of your application and MongoDB doesn’t have transactions, it’s hard to guarantee a lock, but it can be done with some clever programming.