It's a reference to Aphyr's blog series on partitions in distributed application - http://aphyr.com/posts/281-call-me-maybe-carly-rae-jepsen-an.... It's a great series and seems to have raised the level of discussion around distributed apps.

The whole set (in reverse chronological order) is available at http://aphyr.com/tags/jepsen

This link: http://aphyr.com/posts/281-call-me-maybe-carly-rae-jepsen-an... explains everything ;)