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"Zen: MySQL has joined HBase as a supported backend for our graph storage engine."

Is Zen MySQL graph storage open source? Sounds really interesting...

It has not open sourced and I think (and am in no way authoritative) it is unlikely to be open sourced.

I would be interested in a blog post how they store graph data in MySQL (star schema?), so that it scales. (an overview article, no technical details)

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