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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-1850) eliminate parameters that must change with cluster size
Date Thu, 06 Sep 2007 20:29:28 GMT
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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