[jboss-jira] [JBoss JIRA] (JGRP-1579) NAKACK2 / UNICAST2: last message sent to self may not get delivered

NAKACK2 / UNICAST2: last message sent to self may not get delivered ------------------------------------------------------------------- Key: JGRP-1579 URL: https://issues.jboss.org/browse/JGRP-1579 Project: JGroups Issue Type: Bug Reporter: Bela Ban Assignee: Bela Ban Fix For: 3.2.7, 3.3 When A sends a message M that's received by A (M is either a multicast, or a unicast to A), and the message is dropped below NAKACK2 / UNICAST2, then A might *receive* M, but not *deliver* it if M is the last message sent. Scenario (for NAKACK2, but similar to UNICAST2): - A's table is: HD=9, HR=9 - A sends M10 - NAKACK2 adds M10: HD=9, HR=10 (highest-delivered is still 9, as we haven't removed M10 yet) - The transport drops M10 - A sends no further messages - STABLE will make sure that A's HR is 10, but since no message was received, we won't *remove* any messages from A's table ! --> The result is that although A *received* M10, it won't *deliver* M10 (until another message is received) ! SOLUTION: - Maybe we can use the retransmit task to see if there are any unremoved messages in a table and - if so - remove them and pass them up the stack to the application.