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https://issues.apache.org/jira/browse/HADOOP-8118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13218870#comment-13218870
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Suresh Srinivas commented on HADOOP-8118:
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+1 for the change. Gets rid of annoying log messages.
> Print the stack trace of InstanceAlreadyExistsException in trace level
> ----------------------------------------------------------------------
>
> Key: HADOOP-8118
> URL: https://issues.apache.org/jira/browse/HADOOP-8118
> Project: Hadoop Common
> Issue Type: Improvement
> Components: metrics
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Priority: Minor
> Attachments: c8118_20120228.patch
>
>
> There are many InstanceAlreadyExistsException stack traces in the unit tests
> output like below.
> {noformat}
> javax.management.InstanceAlreadyExistsException:
> Hadoop:service=NameNode,name=NameNodeInfo
> at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:453)
> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.internal_addObject(DefaultMBeanServerInterceptor.java:1484)
> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:963)
> ...
> {noformat}
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