In Map Reduce if we pass command line arguments it goes to driver class . However, if want to use it in Mapper class , it can be done as follows:
In Driver class , set the command line argument's value in the configuration object as follows:
public class TestDriver
{
public static void main(String[] args) throws IOException,InterruptedException,ClassNotFoundException
{
Configuration conf = new Configuration();
conf.set("val1", args[0]);
conf.set("val2", args[1]);
}
}
Now , in Mapper , you can get these values as follows:
public class TestMapper extends Mapper
{
public void map(Object key,Text value,Context context) throws IOException,InterruptedException
{
val1=context.getConfiguration().get("val1");
val2=context.getConfiguration().get("val2");
}
}
