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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