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FWIW, I've had much more success with HubSpot's Singularity than Marathon/Chronos. (I use Marathon to bootstrap Singularity as the "init system", because it had HA before Singularity, but that's the extent of its interaction with my system.)

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That's interesting. I've also found it interesting that one of the big selling points of the Mesosphere ecosystem is that it is used at scale by Twitter. But AFAIK twitter developed their own framework for long running tasks (http://aurora.incubator.apache.org/). So they are using Mesos (the open source project), maybe Chronos, and their own version of Marathon. That can be somewhat misleading to newcomers.

To be clear, Twitter runs Aurora which is open source and has proven itself to be stable, battle-tested, and scalable; development on Aurora began in 2010, and over the years Mesos and Aurora have evolved together. Aurora has cron capabilities built into it, and Twitter does not run Marathon or Chronos.

Twitter engineering recently blogged about Aurora with a bit more on its history: https://blog.twitter.com/2015/all-about-apache-aurora, and The New Stack recently published a two-part article on the project: http://thenewstack.io/twitters-aurora-relates-googles-borg-p..., http://thenewstack.io/twitters-aurora-replaces-operating-sys...

(full disclosure, I work at the tweet shop)

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