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https://issues.apache.org/jira/browse/HADOOP-1850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12528140
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Doug Cutting commented on HADOOP-1850:
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Discussion in HADOOP-1874 indicates that the DFS heartbeat interval should also
be adjusted for cluster size.
> eliminate parameters that must change with cluster size
> -------------------------------------------------------
>
> Key: HADOOP-1850
> URL: https://issues.apache.org/jira/browse/HADOOP-1850
> Project: Hadoop
> Issue Type: Improvement
> Components: mapred
> Reporter: Doug Cutting
> Fix For: 0.15.0
>
>
> As far as possible, configurations should be independent of cluster size.
> The cluster size is a parameter that the system knows and should thus be used
> to size things accordingly. Currently we know that the following parameters
> must be adjusted to non-default values for large clusters:
> - mapred.job.tracker.handler.count
> - mapred.reduce.parallel.copies
> - tasktracker.http.threads
> We should attempt to make each of these either set to something proportional
> to cluster size or (harder) dynamically sized based on load.
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