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Has MapReduce been used to make Stackoverflow site?

If yes, what did they do by using MapReduce?

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migrated from Aug 21 '10 at 5:30

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Belongs on meta. Also, see… – Yi Jiang Aug 21 '10 at 5:21
I had already seen it. – Benjamin Aug 21 '10 at 5:26
up vote 3 down vote accepted

No, the map reduce algorithm was not used. We manage to keep our datasets fairly small and SQL efficient so we don't really need sharding for SO yet

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