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https://issues.apache.org/jira/browse/MAPREDUCE-1184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12774263#action_12774263
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Vinod K V commented on MAPREDUCE-1184:
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As such I an neutral to this change. But as I said before, this is
site-specific, job-specific. And this comment I've made only after seeing
different opinions on this issue itself.
Allen says in the description "This should be higher, probably around the 50%
mark".
Hong says
[here|https://issues.apache.org/jira/browse/MAPREDUCE-1184?focusedCommentId=12773788&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_12773788]
"Another case, for tiny jobs that require fast turn around time, it would be
better if we set the percentage to be 0."
Either there is a cross-talk or I am missing something or these are different
use-cases already. If we can agree to a default that is agreeable to everyone
here, I am fine.
> mapred.reduce.slowstart.completed.maps is too high 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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