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| | Ask HN: How do big web sites roll out new versions? | |
110 points by Bluem00 on Dec 27, 2008 | hide | past | favorite | 44 comments
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| | The operations of big websites fascinate me. Sites such as http://highscalability.com/ give an glimpse into the architecture of Amazon, Twitter, and other large systems, but leave out the operations side. So, can anyone explain how they deploy new versions of their sites? For instance, I can't imagine Amazon choosing to go down for even a minute, so what do they do? Am I wrong? Thanks! |
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In apps like this the policy is to only add columns to tables and new tables, never to remove anything, so the database can be upgraded hot, and the old code can continue to run on it, only the new code will see any new columns/tables.