TCPPING: discovery dissemination for static discovery protocols --------------------------------------------------------------- Key: JGRP-1903 URL: https://issues.jboss.org/browse/JGRP-1903 Project: JGroups Issue Type: Feature Request Reporter: Bela Ban Assignee: Bela Ban Fix For: 3.6.1 For {{TCPPING}}, usually all members have to be listed in {{initial_hosts}}. If we don't know all of the members up front, we could have the coordinator disseminate the IP address and port information dynamically. Say {{TCPPING.initial_hosts}} only lists A (the coord). When members B, C, D and E join (in that order), we have the following caches: |A|B|C|D|E| |ABCDE|AB|AC|AD|AE| Every member has information about itself and A, but not about other members. So, for example, D won't be able to send a unicast to C, and vice versa. Or, when E sends a multicast, it would only be delivered to itself and A, but not to B, C and D. h5. Solution * When we have a static discovery layer, have the coordinator broadcast its cache information to the rest of the cluster * This can be done when a new member join, or periodically, or upon request (JMX) * Should be goverened by a property: if someone lists all members in {{initial_hosts}}, then he may want to turn this off