I've seen people using MongoDB in memory only as a cache, so that they can mapre... | Hacker News

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		mcs on Jan 9, 2011 \| parent \| context \| favorite \| on: Node.JS 0.3.4 out (with experimental HTTPS) I've seen people using MongoDB in memory only as a cache, so that they can mapreduce it. Even without that, it's writes to disk are async so it's fast.

cdavid on Jan 9, 2011 [–]

What's the point of map reduce if data can be held in memory ?

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