MR AM slows down due to repeatedly constructing ContainerLaunchContext
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Key: MAPREDUCE-3566
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3566
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: mr-am, mrv2
Affects Versions: 0.23.0
Reporter: Vinod Kumar Vavilapalli
Assignee: Vinod Kumar Vavilapalli
Fix For: 0.23.1
The construction of the context is expensive, includes per-task trips to
NameNode for obtaining the information about job.jar, job splits etc which is
redundant across all tasks.
We should have a common job-level context and a task-specific context
inheriting from the common job-level context.
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