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A clue to why Twitter might be down so much
From Scaling on EC2 « WebMynd Blog:
Google’s key breakthroughs were the Google File System and MapReduce, which together allow them to horizontally partition the problem of indexing the web. If you can architect your product in such a way as to allow for similar partitioning, scaling will be all the more easy. It’s interesting to note that some of the current trends of Web2.0 products are extremely hard to horizontally partition, due to the hyper-connectedness of the user graph (witness Twitter).
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