[jira] [Commented] (AURORA-1827) Fix SLA percentile calculation

["Zameer Manji (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AURORA-1827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15691040#comment-15691040 ] 

Zameer Manji commented on AURORA-1827:
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I upgraded us to Guava 20. It has a [Quantiles|http://google.github.io/guava/releases/20.0/api/docs/com/google/common/math/Quantiles.html] class and a [Stats|http://google.github.io/guava/releases/20.0/api/docs/com/google/common/math/Stats.html] class that could be very helpful here.

> Fix SLA percentile calculation 
> -------------------------------
>
>                 Key: AURORA-1827
>                 URL: https://issues.apache.org/jira/browse/AURORA-1827
>             Project: Aurora
>          Issue Type: Story
>            Reporter: Reza Motamedi
>            Priority: Trivial
>              Labels: newbie, sla
>
> The calculation of mttX (median-time-to-X) depends on the computation of percentile values. The current implementation does not behave nicely with a small sample size. For instance, for a given sample set of  {50, 150}, 50-percentile is reported to be 50. Although, 100 seems a more appropriate return value.
> One solution is to modify `SlaUtil` to perform an extrapolation when the sample size is small or when the corresponding index to a percentile value is not an integer. 



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