Pig should use '-reducer NONE' for map-only jobs
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Key: PIG-196
URL: https://issues.apache.org/jira/browse/PIG-196
Project: Pig
Issue Type: Bug
Reporter: Arun C Murthy
Assignee: Arun C Murthy
Currently, for map-only jobs, Pig writes map-outputs directly to HDFS and then
sends zero data to reducers. The problem with this is two fold:
* Reduce slots are unnecessarily wasted on the cluster
* Reduces write empty files to HDFS putting pressure on the Namenode
Both these can we very easily avoided by just calling:
{noformat}
job.setNumReduces(0);
{noformat}
and letting Hadoop Map-Reduce take care of writing map-outputs directly to HDFS.
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