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From Eric Newton <>
Subject Re: Computations behind JMX Metrics
Date Fri, 01 Mar 2013 14:35:50 GMT
Yes, the average metrics obtained via JMX are exponentially smoothed.

You can get more accurate counters via a thrift call to the master, and you
can trace specific calls to get fine-grained time information for all parts
of a specific transaction.


On Fri, Mar 1, 2013 at 9:26 AM, Brandon Wilson <
> wrote:

> I have a question regarding the JMX metrics exposed by Accumulo. I believe
> the metrics that are reported as averages (e.g., ScanAvgTime) are computed
> as weighted averages over all time, as opposed to a arithmetic mean of a
> set of scan times over a given time window.  Am I correct that the weighted
> average calculation is actual the weighted average since the tserver
> started?
> The average formula I suspect is being use is here:
> Am I on the right track here?
> -Brandon

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