Jason Lowe created MAPREDUCE-5583:
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Summary: Ability to limit running map and reduce tasks
Key: MAPREDUCE-5583
URL: https://issues.apache.org/jira/browse/MAPREDUCE-5583
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: mr-am, mrv2
Affects Versions: 2.1.1-beta, 0.23.9
Reporter: Jason Lowe
It would be nice if users could specify a limit to the number of map or reduce
tasks that are running simultaneously. Occasionally users are performing
operations in tasks that can lead to DDoS scenarios if too many tasks run
simultaneously (e.g.: accessing a database, web service, etc.). Having the
ability to throttle the number of tasks simultaneously running would provide
users a way to mitigate issues with too many tasks on a large cluster
attempting to access a serivce at any one time.
This is similar to the functionality requested by MAPREDUCE-224 and implemented
by HADOOP-3412 but was dropped in mrv2.
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