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https://issues.apache.org/jira/browse/HADOOP-1899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12527617
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Sameer Paranjpye commented on HADOOP-1899:
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Could this be somehow optimized by ignoring tasks that have succeeded and whose
counters are already rolled up, and doing deltas for the ones in progress?
It'll make managing individual task metrics more complex, but might be a win
overall.
> the metrics system in the job tracker is running too often
> ----------------------------------------------------------
>
> Key: HADOOP-1899
> URL: https://issues.apache.org/jira/browse/HADOOP-1899
> Project: Hadoop
> Issue Type: Improvement
> Components: metrics
> Reporter: Owen O'Malley
> Assignee: Owen O'Malley
> Fix For: 0.15.0
>
>
> The metrics system in the JobTracker is defaulting to every 5 seconds
> computing all of the counters for all of the jobs. This work is a substantial
> amount of work showing up as running in 20% of the snapshots that I've seen.
> I'd like to lower the default interval to once every 60 seconds and make it a
> low priority thread.
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