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Oh wow. Can't believe I missed that. Thank you so much! Will fix right away.

That's cool! Thanks for sharing!

You're right, it doesn't work with salted hashes.

Thank you! I'll update it as soon as I can.

I can't quite tell you why it was implemented like this. The Omega paper by Google describes different kinds of scheduling algorithms and their pros and cons.

I don't think that it's backwards compared to other schedulers (many of them are monolithic) but I think it can be improved by using transactions and optimistic concurrency control. This is discussed in the Omega paper and I think there's work to integrate the shared state scheduler into Mesos.

I'm afraid I don't remember exactly which one it was but after an upgrade of the framework it worked perfectly again.

The middle lane is not shared, it will only be used by one direction at a time and a middle barrier is usually separating these two. Wikipedia has an article explaining it further: http://en.wikipedia.org/wiki/2%2B1_road