eliminate parameters that must change with cluster size
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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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