map/reduce doesn't run jobs with 0 maps
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Key: HADOOP-5850
URL: https://issues.apache.org/jira/browse/HADOOP-5850
Project: Hadoop Core
Issue Type: Bug
Components: mapred
Affects Versions: 0.20.0
Reporter: Owen O'Malley
Priority: Critical
Fix For: 0.20.1
Currently, the framework ignores jobs that have 0 maps. This is incorrect. Many
pipelines need the job to run (if nothing else, to create the output
directory!) so that subsequent jobs don't fail. Effectively, there will be no
map tasks and the reduce tasks should immediately set up the Reducer and
RecordWriter and then call close on both since there are no inputs to the
reduce. I believe it should just work if we remove the check...
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