[OAK-6430] Remove Apache Commons Math3 dependency from Segment Tar

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.7.4, 1.8.0
• Component/s: segment-tar
• Epic Link: TarMK transaction rate
• Assignee: Andrei Dulceanu
• Reporter: Andrei Dulceanu
• Created: 06/Jul/17 12:15
• Updated: 04/Oct/19 17:50
• Resolved: 06/Jul/17 14:09

Description

The percentile implementation used when implemented OAK-4732 introduces a dependency on commons-math3. The SynchronizedDescriptiveStatistics [0] used can be easily replaced with
a Histogram implementation [1] from an already used dependency - dropwizard metric library.

[0] http://commons.apache.org/proper/commons-math/javadocs/api-3.3/org/apache/commons/math3/stat/descriptive/SynchronizedDescriptiveStatistics.html
[1] http://metrics.dropwizard.io/3.1.0/apidocs/com/codahale/metrics/Histogram.html

Issue Links

• is broken by: OAK-4732 (Slightly) prioritise reads over writes
• is related to: OAK-6431 Satisfy dependency on io.dropwizard.metrics:metrics-core from oak-segment-tar