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https://issues.apache.org/jira/browse/HADOOP-234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12474303
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Doug Cutting commented on HADOOP-234:
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+1 This proposal looks good. I note that the contexts could, with the
addition of a nextKey() method, be turned into iterators, permitting alternate
map and reduce control structures, like MapRunnable. This may prove to be a
feature.
> Support for writing Map/Reduce functions in C++
> -----------------------------------------------
>
> Key: HADOOP-234
> URL: https://issues.apache.org/jira/browse/HADOOP-234
> Project: Hadoop
> Issue Type: New Feature
> Components: mapred
> Reporter: Sanjay Dahiya
> Assigned To: Owen O'Malley
> Fix For: 0.12.0
>
> Attachments: Hadoop MaReduce Developer doc.pdf, hadoop-pipes.html
>
>
> MapReduce C++ support
> Requirements
> 1. Allow users to write Map, Reduce, RecordReader, and RecordWriter functions
> in C++, rest of the infrastructure already present in Java should be reused.
> 2. Avoid users having to write both Java and C++ for this to work.
> 3. Avoid users having to work with JNI methods directly by wrapping them in
> helper functions.
> 4. The interface should be SWIG'able.
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