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38.2.2. Discovery Groups While the broadcast group defines how connector information is broadcasted from a server, a discovery group defines how connector information is received from a multicast address. A discovery group maintains a list of connector pairs - one for each broadcast by a different server. As it receives broadcasts on the multicast group address from a particular server it updates its entry in the list for that server. If it has not received a broadcast from a particular server for a length of time it will remove that server's entry from its list. Discovery groups are used in two places in HornetQ: By cluster connections so they know what other servers in the cluster they should make connections to. By messaging clients so they can discovery what servers in the cluster they can connect to.