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Posted to issues@aurora.apache.org by "Reza Motamedi (JIRA)" <ji...@apache.org> on 2016/11/23 18:26:58 UTC

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

Reza Motamedi created AURORA-1827:
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             Summary: 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


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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