[infinispan-dev] Is anyone else experiencing JGRP-1675

[Erik Salter]

Hi Radim,

If you're using VMs, this may be of use.  I actually experienced a JGroups
lockup in production with FC in decrementCredits.  What happened in my case
is that virtualization tools had actually screwed with the system clock --
it was reported that JBoss took ~1 year to start.  

http://www.vmware.com/pdf/vmware_timekeeping.pdf

The upshot is that I had to take FC out of my stack going forward.

Erik

-----Original Message-----
From: infinispan-dev-bounces at lists.jboss.org
[mailto:infinispan-dev-bounces at lists.jboss.org] On Behalf Of Radim Vansa
Sent: Friday, October 11, 2013 8:41 AM
To: infinispan-dev at lists.jboss.org
Subject: [infinispan-dev] Is anyone else experiencing JGRP-1675

Hi,

since Infinispan moved to JGroups 3.4, we're experiencing occassional
deadlocks in some tests - most of threads that send anything over JGroups
are waiting in JGroups' FlowControl.decrementCredits. The problem sometimes
goes away after several seconds, but it produces some ugly spikes in our
througput/response time charts. Originally this affected just some RadarGun
tests but this is appearing in some client-server tests as well (we've
recently investigated an issue where this appeared in a regular soak test).
I was looking into that [1] for some time but haven't really figured out the
cause. The workaround is to set up MFC and UFC credits high enough (I use
10M) and stuff works then. I was trying to reproduce that on pure JGroups,
but unsuccessfully.
I am not asking anyone to dig into that, but I wanted to know whether QA is
alone experiencing that or if there are more of us.

Radim

[1] https://issues.jboss.org/browse/JGRP-1675

--
Radim Vansa <rvansa at redhat.com>
JBoss DataGrid QA

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