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https://issues.apache.org/jira/browse/HADOOP-1562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12511822
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Devaraj Das commented on HADOOP-1562:
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+1. Code looks good.
> Report Java VM metrics
> ----------------------
>
> Key: HADOOP-1562
> URL: https://issues.apache.org/jira/browse/HADOOP-1562
> Project: Hadoop
> Issue Type: New Feature
> Components: metrics
> Reporter: David Bowen
> Assignee: David Bowen
> Attachments: 1562.patch, 1562_1.patch, 1562_2.patch, 1562_3.patch
>
>
> It would be useful to have each Java process in Hadoop (JobTracker,
> TaskTracker, NameNode and DataNode) report some Java VM metrics. E.g.
> heap/non-heap memory used/committed, number of garbage collections and
> percentage of time spent in GC, number of threads that are
> runnable/blocked/waiting/etc.
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