.@bhorowitz on why he refused the Databricks founders' $200K ask and wrote them a $10M check instead: "So there were six PhD students, and Ion Stoica, who was their professor." "What they had was this thing called Spark, and the competitor was something called Hadoop. Hadoop had very well-funded companies already running towards it, and Spark was open-source. So the clock was ticking. I think they didn't quite know what they had." "Professors in general, it's a pretty big win if you start a…