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Each Heat engine has a limited thread pool size (64 from memory), and there is a timeout for replies to RPC calls (2 minutes by default). So if you saturate the thread pool to the point where creating new ones is blocked by more than 2 minutes then things will start to fail. However, this happens synchronously so you will get an error from the REST call.

If Heat accepts your request with 202 Accepted then it is reasonable to assume that it's being acted upon. That doesn't mean the stack operation will succeed - in the cloud you can never be sure of that - but your request shouldn't just get lost after that point.