[jboss-jira] [JBoss JIRA] (JGRP-1541) PDC: persist discovery responses

PDC: persist discovery responses -------------------------------- Key: JGRP-1541 URL: https://issues.jboss.org/browse/JGRP-1541 Project: JGroups Issue Type: Feature Request Reporter: Bela Ban Assignee: Bela Ban Fix For: 3.3 When we use TCPPING.initial_hosts=A, and have nodes A, B and C, then the following can happen: - A is started. The view is {A} - B is started, finds A and joins the cluster. The view is {A,B} - C is started, finds A and joins the cluster. The view is now {A,B,C} - A is killed. The view is now {B,C} - C is restarted --> C won't find A therefore cannot ask B to join it (C doesn't know about B) SOLUTION: - If every member persisted its discovery results on disk, C would still know about A and B, and could therefore discover B - This could be implemented directly in TCPPING, or as a generic, separate, protocol (possibly useful for other discovery protocols such as S3_PING, TCPGOSSIP (when the GossipRouter is down) as well) - The disk cache would have to include an expiry mechanism, so that the file doesn't grow forever, and also stale results aren't returned forever - This mechanism would not work though if C came up the first time (no file on disk yet) and A wasn't running.