Laziness helps when dealing with large data sets, but it's also tricky to 
get right. If you mistakenly "hold onto the head" of a lazy sequence, you 
block garbage collection on the entire sequence and usually run out of 
memory.

I think Clojure is good for dealing with large data sets for the following 
reasons:

- rich data-manipulation API built on abstractions
- performance

Also, distributed processing systems written in Java are easily accessible 
from Clojure.  For example, Hadoop and Cascalog.

-S

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