[Spread-users] Issue with Spread going silent

Luke Marsden luke-lists at hybrid-logic.co.uk
Sun Nov 7 09:20:31 EST 2010

By the way this is what the stable failure states looks like:


To my untrained eye, this seems to match up somewhat with the
point-of-view of the spmonitor output.

Is there anything we could do to stop Spread locking up in this way?

Best Regards,
Luke Marsden
CTO, Hybrid Logic Ltd.

Web: http://www.hybrid-cluster.com/
Hybrid Web Cluster - cloud web hosting

Mobile: +447791750420

On Sun, 2010-11-07 at 14:13 +0000, Luke Marsden wrote:
> Hi Yair,
> Thank you. I agree 4% packet loss is high. I get quite a bit of packet
> loss when saturating the network interfaces (spsend/recv or ping -f),
> but none at all when transmitting just a small amount of traffic. Since
> in normal operation Spread shouldn't go near saturating the network
> interfaces, I agree that this is unlikely to be the cause of the
> problem. An interesting artefact of the virtualisation though.
> I have rearranged the machines in the spread.conf. They are using their
> public IPs for this test, not the 10.0.0.* addresses (although they
> exhibit the same behaviour either way):
> Spread_Segment {
>     2f20196c853548e7
> }
> Spread_Segment {
>     27edda570dce48bb
> }
> Spread_Segment {
>     fff0bbd5e0da4103
> }
> I've added the MEMBERSHIP debug flag, and this is the output. I started
> the spread daemons from left-to-right, which now corresponds to
> top-to-bottom :-)
> http://lukemarsden.net/debugging.png
> Does this shed any light?

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