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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-234) Support for writing Map/Reduce functions in C++
Date Mon, 19 Feb 2007 22:46:05 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12474303
] 

Doug Cutting commented on HADOOP-234:
-------------------------------------

+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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