Options opts = new Options();
Option dumpKeys = new Option("d", "dump", false, "dump the key/value pairs");
opts.addOption(dumpKeys);
CommandLine commandLine = new BasicParser().parse(opts, args);
for (String arg : commandLine.getArgs()) {
Path path = new Path(arg);
CachableBlockFile.Reader _rdr = new CachableBlockFile.Reader(fs, path, conf, null, null);