does AllFastestRoute route consider miss as errors?

[weiwongfaye]

docs says:
Immediately sends the same request to all child route handles. Returns the first non-error reply to come back, or if all replies are errors, then the last error reply. Other requests complete in the background and their replies are silently ignored.

does miss count as errors? suppose I have two pools in different AZ, one of the memcached node in one AZ restart and lost value, will AllFastestRoute help get the value from the other pool which still hold the value?

btw, MissFailoverRoute doesn't meet our needs as we still want each AZ server response to requests coming from same AZ consider about the latency, that's why we choose AllFastestRoute, however, it seems AllFastestRoute can't handle the restart case above. (miss doesn't recognized as error)