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ZooKeeper. AIUI, creating your first set of ZooKeeper nodes is a serious PITA. My employer gave up before even started and decided to pay Cloudera for CDH even though we have _zero_ need for Hadoop.

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Honest question, how is ZooKeeper more painful to manage than Kafka itself? ZooKeeper is one of the components from the Hadoop ecosystem that I had never trouble with.

this isn't my experience at all. setting up zookeeper is super easy and ZK is rock solid. there really is no need to pay anyone to setup ZK, it takes maybe an afternoon to automate setting up a cluster

This. I setup ZK and Kafka over a year ago. It took about a day, and it's been running ever since.

Another serious question (and I mean this as un-snarky as I can). Are people just terrible at devops? I'm wondering if the people who think it is "too complex" grew up in a heroku world?

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