why not trying > > -D files=/home/MapReduce/testFile.json
2015-02-20 5:03 GMT+08:00 Haoming Zhang <haoming.zh...@outlook.com>: > Hi, > > > As you know, Hadoop support the Generic Options > <http://hadoop.apache.org/docs/r1.2.1/commands_manual.html#Generic+Options>. > For example you can use "-files" to specify files to be copied to the map > reduce cluster. > > > But how to get the value of Generic Options? For example, I have a command > that is : > > hadoop jar job.jar JobClass -files /home/MapReduce/testFile.json input > output > > I'm using the generic option "-files", and the value of this option is > "/home/MapReduce/testFile.json", so how can I get this value? > > > I tried GenericOptionsParser > <http://hadoop.apache.org/docs/r1.2.1/api/org/apache/hadoop/util/GenericOptionsParser.html> > class like this: > > String option = new GenericOptionsParser(conf, > args).getCommandLine().getOptionValue("files"); > > But the result was NULL. I also changed the parameter of .getOptionValue() > to "-files", got NULL as well. > > > And I also tried the code like this: > > String[] toolArgs = new GenericOptionsParser(conf, args).getRemainingArgs(); > > But the above code only get all the remaining command options other than > the generic options, that is the contrary of my expectation. > > > Any suggestion will be great appreciated! > > > Thanks, > Haoming > >
