Yesterday, to celebrate Spark’s 5 year old birthday, we looked back at the history of the project. Today, we are happy to announce the next major chapter of Spark development: an architectural overhaul designed to enable Spark on mobile devices. Mobile computing is quickly rising to dominance, and by the end of 2017, it is estimated that 90% of CPU cycles will be devoted to mobile hardware. Spark’s project goal can be accomplished only when Spark runs efficiently for the growing population of mobile users. Already today, 100% of Spark’s users have mobile phones.