Architecture

• ed_sup is the root supervisor
• ed_udp_server accepts incoming queries via UDP
• ed_udp_handler_sup spawns child worker processes to answer queries
• ed_zone_sup is responsible for supervising the zone subsystem
• ed_zone_registry_server contains information about all zones registered with the server
• ed_zone_data_sup supervises the actual zone servers
• <0.43.0> is an example of a zone server (here the sample root zone from the end-to-end tests).