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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-1194) mapred.reduce.slowstart.completed.maps allows values more than 1.0 and less than 0.0
Date Tue, 29 Jul 2014 20:12:39 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14078285#comment-14078285
] 

Hadoop QA commented on MAPREDUCE-1194:
--------------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12546601/MAPREDUCE-1194.rev1.patch
  against trunk revision .

    {color:red}-1 patch{color}.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/4774//console

This message is automatically generated.

> mapred.reduce.slowstart.completed.maps allows values more than 1.0 and less than 0.0
> ------------------------------------------------------------------------------------
>
>                 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 Zizin
>            Priority: Minor
>              Labels: newbie
>         Attachments: MAPREDUCE-1194.rev1.patch
>
>
> 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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