Basic

mrjob.job

MRJob

One-step jobs

MRJob.mapper

MRJob.reducer

MRJob.mapper_final

Running the job

MRJob.run

MRJob.__init__

MRJob.make_runner

Parsing the output

MRJob.parse_output_line

Multi-step jobs

MRJob.steps

MRJob.mr

Counters and status messages

MRJob.increment_counter

MRJob.set_status