The cool part about "some local call never fails" is that because of scale out, out-of-order multi-threaded execution, is that even "local calls" (for some defi

The cool part about "some local call never fails" is that because of scale out, out-of-order multi-threaded execution, is that even "local calls" (for some definitions of local) can fail as your preconditions get invalidated in other threads, unless you're employing mutexes/barriers. Those modern computers are a network mesh of small D/G/CPUs, and it's coming back to bite us sometimes.