Can anyone comment on his point about Spark's ML libs? I note that was from last year (about 2015 code), not sure what level of beta they were at, but yeah, I use it for batch processing, but have never used the ML aspects, so just curious.

> And even up to last year, there’s just massive bugs in the machine learning libraries that come bundled with Spark. It’s so bizarre, because you go to Caltrain, and there’s a giant banner showing a cool-looking data scientist peering at computers in some cool ways, advertising Spark, which is a platform that in my day job I know is just barely usable at best, or at worst, actively misleading.