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David Ambrose
Why does everything suck?: A Detailed Five Step Twitter Scaling Plan -
Is this Twitter's way out? From Hank: "Finally, In order to know what machines have what users data there is a bit of overhead in storing a lookup table for each user that indicates where their inbound and outbound data servers are. This is necessary so that each server storing "sent tweets" knows what "received tweet" servers to send each tweet to. I suggest storing this table in memory, or on disk, across all needed servers." - David Ambrose