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https://issues.apache.org/jira/browse/HDFS-1531?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12969182#action_12969182
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Eli Collins commented on HDFS-1531:
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+1 lgtm
> Clean up stack traces due to duplicate MXBean registration
> ----------------------------------------------------------
>
> Key: HDFS-1531
> URL: https://issues.apache.org/jira/browse/HDFS-1531
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node, name-node
> Affects Versions: 0.22.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Trivial
> Attachments: hdfs-1531.txt
>
>
> In the minicluster unit tests, we try to register MXBeans for each DN, but
> since the JMX context is JVM-wide, we get a InstanceAlreadyExistsException
> for all but the first. This stack trace clutters test logs a lot.
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