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Re: [Question #217200]: derivative() results in no data

To: graphite-dev@xxxxxxxxxxxxxxxxxxx
From: Mike Julian <question217200@xxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 20 Dec 2012 20:31:02 -0000
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Question #217200 on Graphite changed:
https://answers.launchpad.net/graphite/+question/217200

    Status: Open => Solved

Mike Julian confirmed that the question is solved:
For anyone else running across this:

The problem was that I had my database storage increment ar 30s and my
SNMP data is only polling every 60s, resulting in no data every other
point. Using derivative() when you're missing data points like that will
cause it to error and result in graphs with no data. A work around is to
apply keepLastValue() first. Solution is to make sure your database
storage interval and polling interval match.

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