zhihai xu created MAPREDUCE-6696:
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Summary: Add a configuration to limit the number of map tasks
allowed per job.
Key: MAPREDUCE-6696
URL: https://issues.apache.org/jira/browse/MAPREDUCE-6696
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: job submission
Affects Versions: 2.8.0
Reporter: zhihai xu
Add a configuration "mapreduce.job.max.map" to limit the number of map tasks
allowed per job. It will be useful for Hadoop admin to save Hadoop cluster
resource by preventing users from submitting big mapreduce jobs. A mapredeuce
job with too many mappers may fail with OOM after running for long time. It
will be a big waste.
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