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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-15549) Upgrade to commons-configuration 2.1 regresses task CPU consumption
Date Wed, 20 Jun 2018 17:15:00 GMT
Todd Lipcon created HADOOP-15549:

             Summary: Upgrade to commons-configuration 2.1 regresses task CPU consumption
                 Key: HADOOP-15549
                 URL: https://issues.apache.org/jira/browse/HADOOP-15549
             Project: Hadoop Common
          Issue Type: Bug
          Components: metrics
    Affects Versions: 3.0.2
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon

HADOOP-13660 upgraded from commons-configuration 1.x to 2.x. commons-configuration is used
when parsing the metrics configuration properties file. The new builder API used in the new
version apparently makes use of a bunch of very bloated reflection and classloading nonsense
to achieve the same goal, and this results in a regression of >100ms of CPU time as measured
by a program which simply initializes DefaultMetricsSystem.

This isn't a big deal for long-running daemons, but for MR tasks which might only run a few
seconds on poorly-tuned jobs, this can be noticeable.

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