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https://issues.apache.org/jira/browse/MAPREDUCE-279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13008881#comment-13008881
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Todd Lipcon commented on MAPREDUCE-279:
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Looking through the code a bit more I came across Hamlet. It seems you've
written your own MVC framework and Java implementation of Haml as part of Yarn.
Can you shed some light on why existing web frameworks were found to be
insufficient? Do we really want a custom HTML generation framework as part of a
resource scheduler?
I don't have much experience with web programming in Java, but I can't imagine
we have any use cases that are _that_ unique that they couldn't be satisfied
using a popular framework like Spring MVC. I also have strong doubts that a
bunch of systems hackers like we have in our community can do a better job at
designing and implementing a web framework compared to people who do web
programming all day long (witness the completely incorrect job we do of input
parameter escaping we do in the current webapps)
> Map-Reduce 2.0
> --------------
>
> Key: MAPREDUCE-279
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-279
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: jobtracker, tasktracker
> Reporter: Arun C Murthy
> Assignee: Arun C Murthy
> Fix For: 0.23.0
>
> Attachments: MR-279.patch, MR-279.patch, MR-279.sh,
> MR-279_MR_files_to_move.txt
>
>
> Re-factor MapReduce into a generic resource scheduler and a per-job,
> user-defined component that manages the application execution.
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