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https://issues.apache.org/jira/browse/HADOOP-13844?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran resolved HADOOP-13844.
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Resolution: Won't Fix
> Move swift duration stats tracking to hadoop common utils
> ---------------------------------------------------------
>
> Key: HADOOP-13844
> URL: https://issues.apache.org/jira/browse/HADOOP-13844
> Project: Hadoop Common
> Issue Type: Improvement
> Components: fs/azure, fs/oss, fs/s3, fs/swift
> Affects Versions: 2.9.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Minor
>
> Swift FS has some simple duration counting classes which are used to track
> HTTP performance, with incremental creation of mean, min, max and variance.
> These are not moving averages, simply ongoing over time. They've proved
> useful in detecting which operations are slowest against objects stores. (it
> turned out to be delete throttling in test teardown BTW, showing the value of
> the instrumentation)
> By moving them into utils, all the object stores can build up some stats on
> cost of HTTP operations.
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