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https://issues.apache.org/jira/browse/HADOOP-3167?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marco Nicosia resolved HADOOP-3167.
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Resolution: Duplicate
Nuts, I didn't know there were already gc/min and gctime% metrics.
> NameNode to report frequency, length, and type of garbage collection
> --------------------------------------------------------------------
>
> Key: HADOOP-3167
> URL: https://issues.apache.org/jira/browse/HADOOP-3167
> Project: Hadoop Core
> Issue Type: Improvement
> Reporter: Marco Nicosia
> Priority: Minor
>
> Right now, we don't know for how long, nor how frequently, the Hadoop
> NameNode engages in garbage collection. We can re-constitute this data from
> logs, but it'd be much better if Hadoop could report this as a metric along
> with all other metrics reported, so we can graph these alongside.
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