[jira] [Created] (FLINK-12982) Make DescriptiveStatisticsHistogramStatistics a true point-in-time snapshot

[Shang Yuanchun (Jira)]

Nico Kruber created FLINK-12982:
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             Summary: Make DescriptiveStatisticsHistogramStatistics a true point-in-time snapshot
                 Key: FLINK-12982
                 URL: https://issues.apache.org/jira/browse/FLINK-12982
             Project: Flink
          Issue Type: Sub-task
          Components: Runtime / Metrics
            Reporter: Nico Kruber
            Assignee: Nico Kruber


Instead of redirecting {{DescriptiveStatisticsHistogramStatistics}} calls to {{DescriptiveStatistics}}, it takes a point-in-time snapshot using an own
UnivariateStatistic implementation that
* calculates min, max, mean, and standard deviation in one go (as opposed to four iterations over the values array!)
* caches pivots for the percentile calculation to speed up retrieval of multiple percentiles/quartiles

This is similar to the semantics of our implementation using codahale's {{DropWizard}}.



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