[jboss-jira] [JBoss JIRA] (JGRP-1578) UNICAST: lost ACK leads to endless retransmissions

[Bela Ban (JIRA)]

Bela Ban created JGRP-1578:
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             Summary: UNICAST: lost ACK leads to endless retransmissions
                 Key: JGRP-1578
                 URL: https://issues.jboss.org/browse/JGRP-1578
             Project: JGroups
          Issue Type: Bug
            Reporter: Bela Ban
            Assignee: Bela Ban
             Fix For: 3.2.7, 3.3


- B sends a unicast message M to A
- A drops the ACK(M) to B
- B sends no further messages to A
--> B will keep retransmitting M to A until it gets an ACK from A, or A leaves the cluster
--> However, A will not send an ACK(M) to B, as the logic for acking only sends an ack if we did receive a message from B and it was successfully added to the retransmit table
--> However, the retransmitted M will not get added to A's table, as M has already been received

SOLUTION:
- Always ack a message frpm B with the highest delivered seqno for B's table

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