GoogleCloudPlatform/appengine-mapreduce — pull request #10 by soundofjw (2014-10-21 21:47:18+00:00)
Title: expose 'counters' and 'job_id' to MapReducePipeline output

MapperPipeline returns named outputs:
* `counters`
* `job_id`

To expose these from the `ReducePipeline.MapperPipeline` to the
MapReduce pipeline, the outputs must be named and passed through
`MapReducePipeline`