Passing arguments to Hadoop mappers

Question

I\'m using new Hadoop API and looking for a way to pass some parameters (few strings) to mappers.
How can I do that?

This solutions

Answer 1

In the main method set the required parameter as below or using the -D command line option while running the job.

Configuration conf = new Configuration();
conf.set("test", "123");

Job job = new Job(conf);

In the mapper/reducer get the parameter as

Configuration conf = context.getConfiguration();
String param = conf.get("test");