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https://issues.apache.org/jira/browse/MAPREDUCE-1906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13462875#comment-13462875
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Arun C Murthy commented on MAPREDUCE-1906:
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Matt - if you don't mind, I'd like to merge this into branch-1.1 since it's
been well baked-in. Thoughts?
> Lower default minimum heartbeat interval for tasktracker > Jobtracker
> ---------------------------------------------------------------------
>
> Key: MAPREDUCE-1906
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1906
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: jobtracker, performance, tasktracker
> Affects Versions: 0.20.1, 0.20.2, 1.2.0
> Reporter: Scott Carey
> Assignee: Todd Lipcon
> Fix For: 0.23.0, 1.2.0
>
> Attachments: MAPREDUCE-1906-0.21.patch,
> MAPREDUCE-1906.branch-1.patch, mapreduce-1906.txt, mapreduce-1906.txt
>
>
> I get a 0% to 15% performance increase for smaller clusters by making the
> heartbeat throttle stop penalizing clusters with less than 300 nodes.
> Between 0.19 and 0.20, the default minimum heartbeat interval increased from
> 2s to 3s. If a JobTracker is throttled at 100 heartbeats / sec for large
> clusters, why should a cluster with 10 nodes be throttled to 3.3 heartbeats
> per second?
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