CLONE - LocalJobRunner should support parallel mapper execution
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Key: MAPREDUCE-2931
URL: https://issues.apache.org/jira/browse/MAPREDUCE-2931
Project: Hadoop Map/Reduce
Issue Type: Improvement
Reporter: Forest Tan
Assignee: Aaron Kimball
Fix For: 0.21.0
The LocalJobRunner currently supports only a single execution thread. Given the
prevalence of multi-core CPUs, it makes sense to allow users to run multiple
tasks in parallel for improved performance on small (local-only) jobs.
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