Generating Multiple Output files with Hadoop 0.20+

Question

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

Answer 1

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.