[jboss-jira] [JBoss JIRA] (JGRP-1401) RELAY2: messages lost when local site master crashes

RELAY2: messages lost when local site master crashes ---------------------------------------------------- Key: JGRP-1401 URL: https://issues.jboss.org/browse/JGRP-1401 Project: JGroups Issue Type: Feature Request Reporter: Bela Ban Assignee: Bela Ban Fix For: 3.2 When we have sites LON={A,B,C} and SFO={X,Y,Z}, if C wants to send a unicast message to the site master of SFO (X), but the *local site master (A)* leaves or crashes, and B hasn't taken over yet, the message will be lost. The idea to solve this is to forward the message to the next coordinator if the current coordinator leaves or dies. A FORWARD_TO_COORD protocol was developed, which handles this task. RELAY2 checks at startup if FORWARD_TO_COORD is present and uses a FORWARD event to tell that protocol to forward a message to the current coordinator. If the protocol is not present, a simple unicast will be sent (unreliably). FORWARD_TO_COORD sends a message M to the current coord and removes M when an ack has been received. If there is a view change, indicating the old coord left, it resends all pending messages, and so on. The extreme case would be that everyone but the sender dies and then M would be sent to the sender itself.