MRApp app = new MRAppWithHistory(2, 1, true, this.getClass().getName(), true);
app.submit(conf);
Job job = app.getContext().getAllJobs().values().iterator().next();
JobId jobId = job.getID();
LOG.info("JOBID is " + TypeConverter.fromYarn(jobId).toString());
app.waitForState(job, JobState.SUCCEEDED);
//make sure all events are flushed
app.waitForState(Service.STATE.STOPPED);
/*
* Use HistoryContext to read logged events and verify the number of