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From psdc1978 <psdc1...@gmail.com>
Subject Difference between some MR classes
Date Tue, 02 Mar 2010 20:50:59 GMT

I've look to the hadoop-0.20.1 source and I've the following questions:

1 - As I understand from the source code, LocalJobRunner is a class used to
run a map or reduce task. But a MR task is launched by the class JvmTask.
What's the difference between the MR from the LocalJobRunner and from the

2 - What's the purpose of the class org.apache.hadoop.mapred.Maptask? What
the difference between this class and TaskInProgress class?


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