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Posted to mapreduce-dev@hadoop.apache.org by "Allen Wittenauer (Resolved) (JIRA)" <ji...@apache.org> on 2011/11/02 18:47:33 UTC
[jira] [Resolved] (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 resolved MAPREDUCE-1184.
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Resolution: Won't Fix
> 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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