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Here is a great post from Bobby Johnson (ex-Facebooker and CTO of Interana) with his opinion on "in-memory" data stores: https://community.interania.com/t5/Blogs/The-Myth-of-In-Memo....

This was the reasoning behind a very key architectural decision at Interana that makes it different than Scuba - instead of developing an in memory system, Interana created a custom data store that is heavily optimized around using spinning disk and CPU cache. This makes it incredibly fast and less expensive to operative massive clusters at scale.

Yes, indeed. Cofounded with Ann Johnson and fellow ex-Facebooker, Bobby Johnson, who led the infrastructure team for many years.

Interana draws much of it's inspiration from Scuba combined with learnings of analyzing massive amounts of data at scale.

Many high-growth companies use Interana for behavioral analysis of their event logs (Asana, Reddit, Imgur, Nextdoor, Bing, Azure, Tinder, SurveyMonkey, Sonos...).