CompositeInputFormat - why in mapred but not mapreduce?

[Mike Spreitzer]

Having looked at a few releases of Hadoop, I am surprised to find that in 
most of them the CompositeInputFormat class is in mapred but not 
mapreduce.  While there is a CompositeInputFormat under mapreduce in 
release 0.21.0, there is no CompositeInputFormat under mapreduce in 
release 1.0.0.  Why is that?  Is there something better under mapreduce 
that I should be using instead?

Thanks,
Mike