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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-1906) Lower minimum heartbeat interval for tasktracker > Jobtracker
Date Mon, 27 Dec 2010 02:04:47 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1906?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated MAPREDUCE-1906:
-----------------------------------

    Attachment: mapreduce-1906.txt

This is Scott's patch but also makes the minimum interval configurable. I set the default
to 300ms as Scott suggests.

> Lower 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
>    Affects Versions: 0.20.1, 0.20.2
>            Reporter: Scott Carey
>         Attachments: MAPREDUCE-1906-0.21.patch, 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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