FileInputFormat.addInputPath(join, new Path(outputDir + "/indexed_left_pages"));
FileInputFormat.addInputPath(join, new Path(outputDir + "/indexed_right_pages"));
FileOutputFormat.setOutputPath(join, new Path(outputDir + "/L13out"));
join.setNumReduceTasks(Integer.parseInt(parallel));
Job joinJob = new Job(join);
joinJob.addDependingJob(loadPages);
joinJob.addDependingJob(loadUsers);
JobControl jc = new JobControl("L13 join");
jc.addJob(loadPages);
jc.addJob(loadUsers);