Steve Loughran created HADOOP-13844:
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Summary: 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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