This figure shows a multi-server domain composed of Host 1, Host 2, Host 3, and Host 4. All hosts share the same deployment group. Host 1 and Host 2 are contained by one ActiveActiveGroupBean notification group and Host 3 and Host 4 are contained by a second ActiveActiveGroupBean notification group. The Host 1 and Host 2 notification group is the primary and the Host 3 and Host 4 notification group is the secondary. An event input arrives at all of Host 1, Host 2, Host 3, and Host 4 but only the hosts in the primary notification group (Host1 and Host 2) output events. Host 1 has a JMS selector of acctid < 1000 and Host 2 has a JMS selector of acctid > 1000. Host 3 has a JMS selector of acctid < 1000 and Host 4 has a JMS selector of acctid > 1000.