add support for getNumMapTasks() into mapreduce JobContext
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Key: MAPREDUCE-3968
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3968
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: mrv1
Affects Versions: 0.22.0
Environment: hadoop 0.22
Reporter: Radim Kolar
Priority: Minor
In old mapred api there was way to query number of mappers:
job.getNumMapTasks())
No such function exists in new mapreduce api
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