Parallel running tasks on one single node may slow down the performance
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Key: MAPREDUCE-1333
URL: https://issues.apache.org/jira/browse/MAPREDUCE-1333
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: jobtracker, task, tasktracker
Affects Versions: 0.20.1
Reporter: Zhaoning Zhang
When I analysis running tasks performance, I found that parallel running tasks
on one single node will not be better performance than the serialized ones.
We can set mapred.tasktracker.{map|reduce}.tasks.maximum = 1 individually, but
there will be parallel map AND reduce tasks.
And I wonder it's true in the real commercial clusters?
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