More redundant initial join logic to avoid becoming a fake coordinator ---------------------------------------------------------------------- Key: JGRP-1977 URL: https://issues.jboss.org/browse/JGRP-1977 Project: JGroups Issue Type: Enhancement Reporter: Osamu Nagano Assignee: Bela Ban Fix For: 3.6.7 If the very initial JGroups discovery packet is lost, it is never recovered by the current GMS join logic. The node will be a standalone coordinator then merges after several minutes. This can happen if a new node reside in another network segment and a switch between the segments requires some time to establish a new multicast route. Currently, there is no enough time between IGMP join (by {{MulticastSocket#joinGroup()}}) and the JGroups discovery packet and the later is lost in such a network environment. Because the number of nodes can be very large, configuring a static route in the switch is not reasonable. Specifically, in method {{org.jgroups.protocols.pbcast.ClientGmsImpl#joinInternal()}}, part of {{gms.getDownProtocol().down(Event.FIND_INITIAL_MBRS_EVT)}} is outside of the retry loop of GMS.max_join_attempts and GMS.join_timeout.