[jboss-jira] [JBoss JIRA] Created: (JGRP-1099) NAKACK: don't send retransmission requests individually

[Bela Ban (JIRA)]

NAKACK: don't send retransmission requests individually
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                 Key: JGRP-1099
                 URL: https://jira.jboss.org/jira/browse/JGRP-1099
             Project: JGroups
          Issue Type: Task
            Reporter: Bela Ban
            Assignee: Bela Ban
             Fix For: 2.9


Currently, when we have messages 1,2 from P and receive 11, then we
- Add message 11 to the NakReceiverWindow
- This causes messages 3-10 to be added to the Retransmitter

These messages are added *individually*, so we have 7 new tasks in the Retransmitter. This also means we send 7 retransmission requests rather than 1 !

Because retransmission requests are sent as OOB messages, they won't get bundled (see [1]) ! Same for the retransmission responses (for OOB messages); they won't get bundled.

Disadvantages: 
#1 We send 7 retransmission messages rather than 1. This could be mitigated if OOB messages were bundled though...
#2 We have 7 rather than 1 additional tasks in the Retransmitter. This taxes the DelayQueue [2] used by the 
     ScheduledThreadPoolExecutor used by the Retransmitter

SOLUTION: go back to the old scheme of having tasks in the Retransmitter which have ranges of seqnos rather than individual seqnos. This is a bit trickier though than single seqnos, as a range of [3 - 10] needs to be broken into [3-5] and [7-10] if seqno 6 is received.



[1] https://jira.jboss.org/jira/browse/JGRP-1090
[2] https://jira.jboss.org/jira/browse/JGRP-1051

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