}
});
Argument outputDirArg = optionalGroup.addArgument("--output-dir")
.metavar("HDFS_URI")
.type(new PathArgumentType(conf) {
@Override
public Path convert(ArgumentParser parser, Argument arg, String value)
throws ArgumentParserException {
Path path = super.convert(parser, arg, value);
if ("hdfs".equals(path.toUri().getScheme())