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Posted to mapreduce-issues@hadoop.apache.org by "Allen Wittenauer (JIRA)" <ji...@apache.org> on 2009/11/09 21:24:32 UTC

[jira] Updated: (MAPREDUCE-1184) mapred.reduce.slowstart.completed.maps is too low by default

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1184?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Allen Wittenauer updated MAPREDUCE-1184:
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    Summary: mapred.reduce.slowstart.completed.maps is too low by default  (was: mapred.reduce.slowstart.completed.maps is too high by default)

> mapred.reduce.slowstart.completed.maps is too low by default
> ------------------------------------------------------------
>
>                 Key: MAPREDUCE-1184
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1184
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>            Reporter: Allen Wittenauer
>
> By default, this value is set to 5%.  I believe for most real world situations the code isn't efficient enough to be set this low.  This should be higher, probably around the 50% mark, especially given the predominance of non-FIFO schedulers.

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