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https://issues.apache.org/jira/browse/HADOOP-1238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12488208
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David Bowen commented on HADOOP-1238:
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+1. Code reviewed. It looks good to me.
> maps_running metric is only updated at the end of the task
> ----------------------------------------------------------
>
> Key: HADOOP-1238
> URL: https://issues.apache.org/jira/browse/HADOOP-1238
> Project: Hadoop
> Issue Type: Bug
> Components: metrics
> Affects Versions: 0.12.3
> Environment: ganglia metrics
> Reporter: Michael Bieniosek
> Assigned To: David Bowen
> Priority: Minor
> Attachments: fix-tasks-running-metric.patch
>
>
> The maps_running and reduces_running metrics aren't getting into ganglia
> correctly - they always appear to be underestimated. A quick look at the
> TaskTracker code shows that these metrics are only updated when a task is
> finished. Of course, once a task is finished, the reporting will not note
> the completed task (since it's not running anymore).
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