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https://issues.apache.org/jira/browse/MAPREDUCE-326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12829714#action_12829714
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Todd Lipcon commented on MAPREDUCE-326:
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I think this is just a straw man argument, but: what if we actually pushed down
the sort requirements into the child? Is there a world where this would make
sense?
Alternatively, what if we *only* allowed byte comparisons? I believe some other
implementations restrict you to this. What percentage of existing applications
would be impossible? (by impossible I really mean impossible, not just
"requiring rewrite". I'm going with an assumption here that this discussion is
currently in theoretical mode)
> The lowest level map-reduce APIs should be byte oriented
> --------------------------------------------------------
>
> Key: MAPREDUCE-326
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-326
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Reporter: eric baldeschwieler
>
> As discussed here:
> https://issues.apache.org/jira/browse/HADOOP-1986#action_12551237
> The templates, serializers and other complexities that allow map-reduce to
> use arbitrary types complicate the design and lead to lots of object creates
> and other overhead that a byte oriented design would not suffer. I believe
> the lowest level implementation of hadoop map-reduce should have byte string
> oriented APIs (for keys and values). This API would be more performant,
> simpler and more easily cross language.
> The existing API could be maintained as a thin layer on top of the leaner API.
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