[jboss-jira] [JBoss JIRA] Commented: (JGRP-455) Problem with retransmission: message not found

[Bela Ban (JIRA)]

    [ http://jira.jboss.com/jira/browse/JGRP-455?page=comments#action_12364993 ] 
            
Bela Ban commented on JGRP-455:
-------------------------------

Looks like the retransmission requests are spurious requests due to timers cancelled a bit too late every now and then. The tests complete, which means that we certainly didn't hit issue 455, otherwise everyone would have been stuck !

I ran 3 tests on 6 nodes with 6 senders:
- Each sender sends 5M 1K messages, tests complete okay with 48'000 1K messages / sec / node (75MB/sec/node)
- ditto: OK
- Each sender sends 5M 5K messages, tests complete okay with  17'800 5K messages / sec / node (89MB/sec/node !)

> Problem with retransmission: message not found
> ----------------------------------------------
>
>                 Key: JGRP-455
>                 URL: http://jira.jboss.com/jira/browse/JGRP-455
>             Project: JGroups
>          Issue Type: Bug
>    Affects Versions: 2.4.1 SP1
>            Reporter: Bela Ban
>         Assigned To: Bela Ban
>            Priority: Blocker
>             Fix For: 2.5, 2.4.1 SP4
>
>         Attachments: tmp.txt, tmp2.txt, udp-atl.xml
>
>
> Sometimes a sender cannot find a message with a seqno as requested by a receiver. The seqno requested (47176) was already purged, sent_msgs:  [48059 - 48090] (32)
> This could be either an issue in STABLE, which prematurely purges messages although not all members agreed on the highest seqnos seen, or NAKACK, which might incorrectly 'change' seqnos. Very hard to reproduce !
> Trace:
> 42032 [ERROR] [OOB Thread,perf,10.68.32.33:32968] NAKACK.handleXmitReq(): - (requester=10.68.28.33:33763, local_addr=10.68.32.33:32968) message 10.68.32.33:32968::47176 not found in sent msgs [48059 - 48090] (32)

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