FileOutputFormat.setOutputPath(lp, new Path(outputDir + "/L6out"));
lp.setNumReduceTasks(Integer.parseInt(parallel));
Job group = new Job(lp);
JobControl jc = new JobControl("L6 join");
jc.addJob(group);
new Thread(jc).start();
int i = 0;
while(!jc.allFinished()){