[jboss-jira] [JBoss JIRA] Created: (JGRP-528) NAKACK: spurious retransmission requests

[Bela Ban (JIRA)]

NAKACK: spurious retransmission requests 
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                 Key: JGRP-528
                 URL: http://jira.jboss.com/jira/browse/JGRP-528
             Project: JGroups
          Issue Type: Task
    Affects Versions: 2.5
            Reporter: Bela Ban
         Assigned To: Bela Ban
             Fix For: 2.6


Every now and then, spurious retransmission requests are received:

NAKACK.handleXmitReq(): (requester=192.168.5.2:4397, local_addr=192.168.5.2:4393) message 192.168.5.2:4393::600 not found in retransmission table of 192.168.5.2:4393: [650 : 1050 (1100) (size=x, missing=0, highest stability=650)]

It turns out that message #600 *was* actually retransmitted correctly, but the retransmission timer was cancelled too late, so that we got 1 or 2 spurious retransmit requests for the same message.

This doesn't happen very frequently, and only under heavy load (e.g. 8 nodes, every node sends 5M 5K messages with 500 threads).

Note that this issue DOES NOT LEAD TO INCORRECT BEHAVIOR !

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