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I suspect that if new features require storage changes, the changes are strictly additive and won't affect old features, or old features are modified to use the

I suspect that if new features require storage changes, the changes are strictly additive and won't affect old features, or old features are modified to use the new storage setup. With the amount of data Facebook has, they probably don't have the option of an "iterate over every row and change a thing" kind of migration.

flyt 15y ago
No, but they do have an extremely fast and efficient tool for performing online schema changes to its huge MySQL deployment: https://www.facebook.com/notes/mysql-at-facebook/online-schema-change-for-mysql/430801045932 https://www.facebook.com/notes/mysql-at-facebook/online-sche...