Passing data files via the distributed cache

[Andy Doddington]

I have a series of mappers that I would like to be passed data using the 
distributed cache mechanism. At the
moment, I am using HDFS to pass the data, but this seems wasteful to me, since 
they are all reading the same data.

Is there a piece of example code that shows how data files can be placed in the 
cache and accessed by mappers?

Thanks,

        Andy Doddington