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https://issues.apache.org/jira/browse/HADOOP-15549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16755555#comment-16755555
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Yuming Wang commented on HADOOP-15549:
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Thanks [~ste...@apache.org]. Two new JIRAs have been created:
https://issues.apache.org/jira/browse/HADOOP-16086
https://issues.apache.org/jira/browse/HADOOP-16087
> 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
> Priority: Major
> Fix For: 3.2.0
>
> Attachments: hadoop-15549.txt
>
>
> 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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