[jboss-jira] [JBoss JIRA] Commented: (JGRP-523) Multicasts fail after a merge

[Bela Ban (JIRA)]

    [ http://jira.jboss.com/jira/browse/JGRP-523?page=comments#action_12364533 ] 
            
Bela Ban commented on JGRP-523:
-------------------------------

This can be reproduced with MergeTest.testTwoMerges().

The issue is that NAKACK.down(TMP_VIEW) (received just before a merge view) creates new NakReceiverWindows for each sender S which is not in the xmit_table with seqno=0.

When we do receive the merge view, NAKACK.mergeDigests() does *not* set the lowest and highest seqnos for S's NRW as it is already present in xmit_table ! So the highest delivered seqno is 0, whereas the real seqno might be 100, so the next time we send a message, retransmission for 1-100 kicks in !

Solution: comment adjustReceivers() in down(TMP_VIEW), so we don't actually create new entries for new members with seqno=0, but wait until down(VIEW_CHANGE) is received (where we *do* call adjustReceivers()).

> Multicasts fail after a merge
> -----------------------------
>
>                 Key: JGRP-523
>                 URL: http://jira.jboss.com/jira/browse/JGRP-523
>             Project: JGroups
>          Issue Type: Bug
>    Affects Versions: 2.5
>            Reporter: Bela Ban
>         Assigned To: Bela Ban
>            Priority: Critical
>             Fix For: 2.5
>
>
> To reproduce:
> - Start GossipRouter
> - Start 2 Draws with tunnel.xml, connecting to the GR
> - Paint a bit in the 2 windows, to generate messages (and thus change the digests)
> - Kill GR
> - When both Draw instances become cluster singletons, start GR again
> ==> Observe that we get messages that indicate a requested retransmission couldn't be satisfied because the message was not found:
> 14:38:16,203 [WARN] [OOB Thread,demo,192.168.5.2:4397] NAKACK.handleMessage(): 192.168.5.2:4397] discarded message from non-member 192.168.5.2:4393, my view is [192.168.5.2:4397|2] [192.168.5.2:4397]
> 14:38:16,890 [WARN] [OOB Thread,demo,192.168.5.2:4393] NAKACK.handleMessage(): 192.168.5.2:4393] discarded message from non-member 192.168.5.2:4397, my view is [192.168.5.2:4393|2] [192.168.5.2:4393]

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