job.setMapperClass(DistributedCacheCheckerMapper.class);
job.setReducerClass(DistributedCacheCheckerReducer.class);
job.setOutputFormatClass(NullOutputFormat.class);
FileInputFormat.setInputPaths(job, first);
// Creates the Job Configuration
job.addCacheFile(
new URI(first.toUri().toString() + "#distributed.first.symlink"));
job.addFileToClassPath(second);
job.addArchiveToClassPath(third);
job.addCacheArchive(fourth.toUri());
job.setMaxMapAttempts(1); // speed up failures