#17: extracted the HDFS file read code in a new HDFSUtils class, used by GetAticlesMapred and LemmaIndexMapred.
Latter also was failing because the stopwords.csv file could not be found on the executing mappers.
Set all jobs to execute in the foreground with verbose print output to see detailed progress and exception stacktraces (job.waitForCompletion(true) instead of job.submit()).