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by londons_explore
2032 days ago
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It's possible (albeit much harder) for stateful services too. It basically boils down to "We must be able to restore the minimum necessary parts of a full backup in under 10 minutes". Take wikipedia as an example. I'd expect them to be able to restore a backup of the latest version of all pages in 10 minutes. It's 20GB of data, and I assume it's sharded at least 10 ways. That means each instance will have to grab 2GB from the backups. Very do-able. As a service gets bigger, you typically scale horizontally, so the problem doesn't get harder. Restoring all the old page versions and re enabling editing might take longer, but that's less critical functionality. |
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