Yariv’s Blog » Blog Archive » Parallel merge sort in ErlangI’ve been thinking lately about the problem of scaling a service like Twitter or the Facebook news feed. When a user visits the site, you want to show her a list of all the recent updates from her friends, sorted by date. It’s easy when the user doesn’t have too many friends and all the updates are on a single database (as in Twoorl’s case :P). You use this query: "select * from update where uid i
