New question #289184 on Graphite:
https://answers.launchpad.net/graphite/+question/289184
I'm currently testing collectd 5.4.2 (on Scientific Linux 6.1) + Graphite
0.9.15 + Grafana 2.6.0 (on Debian 8.3) for observing the performance of a set
of systems.
It took me a while to figure out that functions like derivative() and
perSecond() really can't deal with null data points, and somehow I'd missed in
the docs the part where "Whisper requires that metric updates occur at the same
interval as the finest resolution storage archive."
The scenario I have is that generally, I want to submit samples at 60-second
intervals and with a long retention, but during e.g. performance regression
test runs, I'd like to be able to bump the sampling rate up to say every 5
seconds. Obviously my initial config of something like 5s:28d and just
submitting data points 1/min yielded poor results when trying to analyze things
with functions like derivative().
I'm pretty hooked on the query method Grafana presents in conjunction with
Graphite (it's very user-friendly for casual users), so I've not spent a ton of
time considering other options like InfluxDB, etc. as storage mechanisms that
might work better for this situation.
Half-baked idea I've had to address this with Graphite + Grafana:
- Embed the finest resolution in the metric name upon generation
- Use carbon-{aggregator,relay} to steer counters in the right direction
-- That is, write 5-second samples into high-resolution database + roll them up
into 1-min database
- Access via multiple data stores configured in Grafana
Before I invest a day and a half a bottle of whisky into trying that, I wanted
to see if anyone has a better idea, or can point me towards some guidance. I've
RTFM'd pretty thoroughly at this point, and not found an elegant solution.
Any feedback appreciated, including "no, just no."
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