DNS Push Notifications
Does anyone know what mechanism is used between Route 53 and Google DNS?  When I update a record in Route 53, there seems to be 0 delay in the updated records being present in 8.8.8.8, even if I've recently request the old value.  I've been imagining that they had set up some sort of "cache invalidate" message that AWS could send Google, but I haven't done any investigation.