[jboss-jira] [JBoss JIRA] Created: (JGRP-968) UNICAST: loss of first msg after asymmetric close causes all further messages to be lost

[Bela Ban (JIRA)]

UNICAST: loss of first msg after asymmetric close causes all further messages to be lost
----------------------------------------------------------------------------------------

                 Key: JGRP-968
                 URL: https://jira.jboss.org/jira/browse/JGRP-968
             Project: JGroups
          Issue Type: Bug
            Reporter: Bela Ban
            Assignee: Bela Ban
             Fix For: 2.6.10.merge, 2.8


This is scenario #6 in UNICAST.new.txt


#4 A closes the connection unilaterally (B keeps it open), then reopens it and sends a message:
- A removes the entry for B from its connection table, cancelling all pending retransmissions
- (Assuming that B's entry.recv_win for A is at #25)
- A creates a new entry for B in its connection table
- Entry.send-conn-id is set and sent with the message
- Entry.seqno now is 1
- B receives the message with a new conn-id
- B does have an entry for A, but entry.recv-conn-id doesn't match msg.conn-id
- B creates a new entry.recv_win, sets it to msg.seqno
- B sets entry.recv-conn-id to msg.conn-id


#6 Same as #4, but after re-establishing the connection to B, A loses the first message
(first part of #4)
- A creates a new sender window for B
- A sends #1(conn-id=322649) #2(conn-id=0) #3(conn-id=0), but loses #1
- B receives #2 first. It thinks this is part of a regular connection, so it doesn't trash its receiver window
- B expects a seqno higher than #2 (from the prev conversation with A), and discards #2, but *acks* it nevertheless
- A removes #2 from its sender window
- B now finally receives #1, and creates a new receiver window for A at #1
- A retransmits #3
- B stores #3 but doesn't deliver it because it hasn't received #2 yet
- However, B will *never* receive #2 from A because that seqno has been removed from A's sender window !


-- 
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators: https://jira.jboss.org/jira/secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira