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Posted to mapreduce-issues@hadoop.apache.org by "Allen Wittenauer (JIRA)" <ji...@apache.org> on 2014/07/29 22:02:40 UTC

[jira] [Updated] (MAPREDUCE-1194) mapred.reduce.slowstart.completed.maps allows values more than 1.0 and less than 0.0

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1194?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Allen Wittenauer updated MAPREDUCE-1194:
----------------------------------------

    Labels: newbie  (was: )

> 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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