[jboss-jira] [JBoss JIRA] (JGRP-1419) UNICAST / UNICAST2: combine retransmission for all members

[Bela Ban (JIRA)]

Bela Ban created JGRP-1419:
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             Summary: UNICAST / UNICAST2: combine retransmission for all members
                 Key: JGRP-1419
                 URL: https://issues.jboss.org/browse/JGRP-1419
             Project: JGroups
          Issue Type: Enhancement
            Reporter: Bela Ban
            Assignee: Bela Ban
             Fix For: 3.1


UNICAST:
- The sender has an AckSenderWindow, the receiver an AckReceiverWindow
- The sender keeps retransmitting until the receiver delivers the message and acks it

UNICAST2:
- The sender has an AckSenderWindow (without retransmission) and the receiver a NakReceiverWindow
- The receiver asks the sender for retransmission only if there's a gap
- Stability ensures that the sender doesn't keep messages around forever

Suggestions:
- Similar to NAKACK, don't use a separate retransmitter for every member (window), but have just 1 retransmitter task scan the message tables and do retransmission
- In UNICAST2, Table<Message> can replace the NakReceiverWindow on the receiver side
- In UNICAST2, we can probably also replace the sender's window with a Table<Message>
- in UNICAST, the sender's AckSenderWindow can also be replaced with a Table<Message>
- In UNICAST, investigate whether the receiver window can be replaced with a Table<Message> as well !

If we can do this, then we have 
- only 1 proven data structure (Table<Message>)
- not 1 retransmitter per window, but 1 for all the windows (saving space) !

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