Bumping this thread - I updated to rrdtool 1.4.7 & rebuilt ganglia against
the new version of rrdtool and it didn't appear to change the behavior.
Any suggestions for what this problem might be would be much appreciated.
Thanks,
Aaron
On Mon, Oct 22, 2012 at 8:47 PM, Aaron Nichols <anich...@trumped.org> wrote:
> Re-posting this on ganglia-general as I didn't get any hits on -developers:
>
> 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
>
>
--
Twitter: @anichols
Blog: http://www.opsbs.com
Pro: http://www.linkedin.com/in/anichols
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