One of the companies that supposedly tamed Hadoop is Facebook...but according to Bobby Johnson, who helped run Facebook's Hadoop cluster before co-founding behavioral analytics company Interana, the fact that Hadoop is still around is a "historical glitch. That may be a little strong," Johnson says. "But there's a bunch of things that people have been trying to do with it for a long time that it's just not well suited for." Hadoop's strengths lie in serving as a cheap storage repository and for processing ETL batch workloads, Johnson says. But it's ill-suited for running interactive, user-facing applications... "After years of banging our heads against it at Facebook, it was never great at it," he says. "It's really hard to dig into and actually get real answers from... You really have to understand how this thing works to get what you want."
Johnson recommends Apache Kafka instead for big data applications, arguing "there's a pipe of data and anything that wants to do something useful with it can tap into that thing. That feels like a better unifying principal..." And the creator of Kafka -- who ran Hadoop clusters at LinkedIn -- calls Hadoop "just a very complicated stack to build on."