Mostafa Elhemali created HADOOP-9559:
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Summary: When metrics system is restarted MBean names get
incorrectly flagged as dupes
Key: HADOOP-9559
URL: https://issues.apache.org/jira/browse/HADOOP-9559
Project: Hadoop Common
Issue Type: Bug
Reporter: Mostafa Elhemali
Assignee: Mostafa Elhemali
In the Metrics2 system, every source gets registered as an MBean name, which
gets put into a unique name pool in the singleton DefaultMetricsSystem object.
The problem is that when the metrics system is shutdown (which unregisters the
MBeans) this unique name pool is left as is, so if the metrics system is
started again every attempt to register the same MBean names fails (exception
is eaten and a warning is logged).
I think the fix here is to remove the name from the unique name pool if an
MBean is unregistered, since it's OK at this point to add it again.
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