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https://issues.apache.org/jira/browse/MAPREDUCE-1184?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allen Wittenauer updated MAPREDUCE-1184:
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Affects Version/s: 0.20.1
0.20.2
> 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
> Affects Versions: 0.20.1, 0.20.2
> 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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