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At this point, I could go into a long description of what map/reduce actually is but that kind of thing is available via the use of a convenient google search.

The short of it is that you map some data from each document into a structure to be queried on, and then run (and re-run) a reduce function over the mapped data in order to group it by some key.

Now, these map functions can get quite complicated, but the concept remains the same from the most basic versions up to the more complicated reports on the data.

Let's look at the standard example of getting the number of comments across all the blog entries by a certain author.



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