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From Philippe Mouawad <p.moua...@ubik-ingenierie.com>
Subject Use of https://github.com/HdrHistogram/HdrHistogram
Date Sat, 06 May 2017 13:41:19 GMT
Hello,
A user recently reported a bug on StatCalculator class:

   - https://bz.apache.org/bugzilla/show_bug.cgi?id=61071

It appears issue is not restrained to Median but concerns  percentile
computing.

Besides, this class has many drawbacks:

   - It is not tested as much as it should be
   - It relies on an algorithm that consumes memory

We use another class in Web/Dashboard report and BackendListener client
implementations that relies on commons-math
org.apache.commons.math3.stat.descriptive.DescriptiveStatistics.

My proposal is the following:

   - First step : Introduce in StatCalculator, HdrHistogram
   - Second step : Replace DescriptiveStatistics by HdrHistogram


Benefits:

   - Uniform computing accross JMeter
   - Better performances

Are you ok with this approach ?

Thanks
-- 
Regards.
Philippe Mouawad.
Ubik-Ingénierie

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