Generating Multiple Output files with Hadoop 0.20+

I am trying to output the results of my reducer to multiple files. The data results are all contained in one file, and the rest of the results are split based on a category in their respected files. I know with 0.18 that you can do this with MultipleOutputs and it has not been removed. However, I am trying to make my application 0.20+ compliant. The existing Multiple outputs functionality st开发者_Go百科ill requires JobConf (which my application uses Job, and Configuration). How can I generate multiple outputs based on the key?

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Support for MultipleOutputs isn't in 0.20. You will need to use the older API.

It has been added into 0.21 which is currently unreleased as org.apache.hadoop.mapreduce.lib.output.MultipleOutputs.

This thread on the mailing list talks about this problem.

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You can do this in Hadoop 0.20, just that as mentioned you have to use the older API.

There's some very rough code to do so in http://github.com/orngejaket/Info_Moist_1_Splicer/tree/master/src/contrib/streaming/src/java/org/infochimps/hadoop/mapred/lib/

The resulting jar writes each record to a file named after its (sanitized) key.