Hey Philip,
Thanks for the info. We're getting alerts pretty frequently and it seems
that there is no swapping and then it spikes to around 1.4K pages per
second, according CM.
It looks like the MySQLD on this box is taking up 91% of the system's RAM.
That seems high to me. It is serving CM, CM services, Hue, Hive, and
Oozie. I also notice that the cmf.main java program is taking up about 25%
of the server's CPU on average.
Perhaps we need to separate these services to run on different machines....
Thanks
-Joe
On Thu, Jan 23, 2014 at 10:35 AM, Philip Zeyliger wrote:Hi Joe,
The first question is how much it's swapping. If it's just a few pages
here and there, you can tune the alert to ignore it. I doubt a few pages
times 4KB is going to cause a performance issue.
If you're curious what process has swapped pages, you can look in
/proc/pid/smaps, like this guy did:
http://northernmost.org/blog/find-out-what-is-using-your-swap/Is your machine over-subscribed? That'll cause it too. I research that
by using top/htop and adding things up.
-- Philip
On Thu, Jan 23, 2014 at 5:46 AM, Joe Travaglini wrote:
Hello,
I've got a new 45 node cluster with CM 4.8 ... I'm getting alerts that
the CM host (which is running CM management services) is swapping, even
though vm.swappiness = 0.
The box is also running a MySQL for Hive/Hue/Oozie/SCM.
How would I go about figuring out what's causing the swapping? I have
not seen this happen on a CM box before.
Thanks
-Joe
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