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From "Ruyue Ma (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1667) resource estimation still works badly in some cases
Date Fri, 02 Apr 2010 09:18:27 GMT
resource estimation still works badly in some cases

                 Key: MAPREDUCE-1667
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1667
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: jobtracker
            Reporter: Ruyue Ma
            Assignee: Ruyue Ma

A premise upon which our current implemention of ResourceEstimator is that the MapInputSize
and MapOutputSize has relation. 

In many user cases, the premise is not satisfied.  


1. The map input is a file list.
2. Every mapper will download the file, process, then output (into map intermediate output)

if one file name is very long, the estimated output size maybe very big.

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