Add a test for the jmx metrics serving
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Key: HADOOP-8073
URL: https://issues.apache.org/jira/browse/HADOOP-8073
Project: Hadoop Common
Issue Type: Improvement
Components: metrics
Affects Versions: 1.0.0
Reporter: Kihwal Lee
>From HADOOP-8050,
bq. ...people can run something like jcarder with the unit tests and detect
potential deadlocks.
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