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Date: Fri, 6 Nov 2009 17:12:32 +0000 (UTC)
From: "Maxim (JIRA)" <jira@apache.org>
To: mapreduce-dev@hadoop.apache.org
Subject: [jira] Created: (MAPREDUCE-1194)
 mapred.reduce.slowstart.completed.maps allows values more than 1.0 and less
 than 0.0
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mapred.reduce.slowstart.completed.maps allows values more than 1.0 and less than 0.0
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                 Key: MAPREDUCE-1194
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1194
             Project: Hadoop Map/Reduce
          Issue Type: Bug
    Affects Versions: 0.20.1
            Reporter: Maxim
            Priority: Minor


When run with value less than 0.0 (e.g. -1.0) works similar to 0.0, but when value is more than 1.0 (e.g. 50.0) reducers don't start at all. Is there a reason why such values are allowed? I understand that this is clear from the description that parameter is fraction but some people may forget and confuse it with percents and as result have problems. Why not throw an error in this case?

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