All,
I'm trying to apply Holt-Winters to a few of our rrd's and have run into
a problem which seems specific to the __SummaryInfo__ rrds. When I apply
the Holt-Winters algorithm to both the host rrds as well as the
__SummaryInfo__ rrds, the host rrds work fine however the __SummaryInfo__
do not. This note will focus on the __SummaryInfo__ rrds.
These metrics are stored in an rrd of type COUNTER. I have also observed
this behavior on the same metric set to type DERIVE.
I am using the rrd_hwreapply.pl script (
http://rrfw.sourceforge.net/rrdman/rrd_hwreapply.pod.html) to apply
holt-winters to the rrds and for simplicity right now I'm only using the
following command line:
$ sudo -u nobody cp cron.webServiceRequestCounter.Counter.rrd
cron.webServiceRequestCounter.Counter.rrd.bak && sudo -u nobody
rrd_hwreapply cron.webServiceRequestCounter.Counter.rrd.bak
cron.webServiceRequestCounter.Counter.rrd --defaults --force
As soon as I run this command, the primary metric
(cron.webServiceRequestCounter.Counter) will stop rendering new values on
the graph. It appears, however, that updates are still being stored in the
rrd except in a different column in each row - I couldn't find much info
about what the two different columns in the rrdtool dump output are for.
I have placed images, rrdtool dump output & version info into a github
repository here - just view the readme
https://github.com/adnichols/ganglia-hw-graph-problem
I dug through the rrdtool changes in 1.4.6 & 1.4.7 and didn't see anything
that looked like this problem, however if someone can point me to something
that suggests rrdtool is the issue I can update. It's just a fair amount of
work that I'd like to avoid if it's not the issue.
Thanks,
Aaron
--
Twitter: @anichols
Blog: http://www.opsbs.com
Pro: http://www.linkedin.com/in/anichols
------------------------------------------------------------------------------
Everyone hates slow websites. So do we.
Make your web apps faster with AppDynamics
Download AppDynamics Lite for free today:
http://p.sf.net/sfu/appdyn_sfd2d_oct
_______________________________________________
Ganglia-developers mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/ganglia-developers
