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Facebook use bittorrent as part of their deployment process, they exploit rack and cluster affinity to improve performance [1].

[1] https://facebook.com//download/1411324735760067/devops.pdf

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Twitter has been doing this for a while: https://blog.twitter.com/2010/murder-fast-datacenter-code-de...

ROCKS clustering software was doing this before Facebook. We'd use it to reinstall Redhat on ~6000 Linux nodes. Could reinstall the entire cluster in 15 minutes while still running jobs for end users.

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