Re: [jgroups-dev] Reception of Multicast message stopped after network restart

Bela Ban <[email protected]>
Newsgroups gmane.comp.java.javagroups.devel,gmane.comp.java.javagroups.general
Message-ID <[email protected]>

[email protected] wrote:
> Hi,
> We are investigating an issue that appear on JGroups 2.8 GA using 
> standard udp.xml configuration look like nodes stop receiving/handling 
> Multicast messages without exception/logs resulting on a UDP storm on 
> large cluster.

How would nodes which stop receiving messages trigger a UDP storm ?

> We have been able to reproduce the issue with this very simple 
> scenario on Linux 5.3 64bits.
> Scenario: A and B join the same cluster, when everything is stable, We 
> perform a network restart on server A {/sbin/service network restart}.

I don't think this works: an ifconfig down/up is not something that a 
socket would survive ! Can you use IP Bonding ?

I'll try this out on my Linux cluster though to see what the behavior is

> For an unknown raison node A stop receiving Multicast from B resulting 
> on an unstable cluster were members could not join the same cluster 
> anymore. We are reproducing this issue 100% of the time.

How ? By simply doing a network restart ?

-- 
Bela Ban
Lead JGroups / Clustering Team
JBoss

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