[Varnish] #676: keeping varnishstat open will bring down server
Varnish
varnish-bugs at varnish-cache.org
Tue Apr 13 15:27:50 CEST 2010
#676: keeping varnishstat open will bring down server
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Reporter: ahongens | Owner: phk
Type: defect | Status: new
Priority: low | Milestone:
Component: varnishstat | Version: trunk
Severity: minor | Keywords:
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Hey guys,
I've seen something I'd like to share with you, perhaps it could be seen
as a bug in varnishstat.
Yesterday I opened ssh sessions to my 4 balancers, to run some scripts,
and then I opened varnishstat to monitor them. A while later I had to
leave in a rush and closed my laptop's lid, and in that process killed my
vpn tunnel and ssh sessions. However, the varnishstat process (apparently)
keeps running. (FreeBSD 7.2 x64)
Just a few hours ago (so around 16 hours later), I had one balancer die on
my (become completely unresponsive, refuse connections to port 80). I
immediately restarted varnishd, and I also saw a varnishstat instance eat
100% cpu, which I killed.
Now when I just looked on the other balancers, I see the varnishstat
instance using up a lot of CPU (only one out of 4 cores though). See
attached top.txt.
So it seems running varnishstat for a long time, it will use more and more
resources, and in my case, even cause varnishd to fail somehow (it could
be a coincidence, but I don't think so).
After killing varnishstat, load went back from 1.5 to 0.2, around the
usual.
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Ticket URL: <http://www.varnish-cache.org/ticket/676>
Varnish <http://varnish-cache.org/>
The Varnish HTTP Accelerator
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