Todd Lipcon created HADOOP-15549:
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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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