Recall from last time
Wednesday, February 23, 2011
3:46 PM
We have class tomorrow (Monday's schedule)!
Recall from last time
Map/Reduce consists of
A Map phase in which we do something to each record.
A Reduce phase where we combine results. 
We only write what to do to each element, and how to combine a list of things. 
The Map/Reduce framework does the rest. 