I work for a big Hadop vendor and I regularly diagnose performance issues with big clusters. Yes, sometimes even thousands of nodes. Most of the time, it come

I work for a big Hadop vendor and I regularly diagnose performance issues with big clusters. Yes, sometimes even thousands of nodes. Most of the time, it comes down to an incorrect assumption or configuration. There are certainly real bugs and shortcomings, but the bottom line is that the systems we sell are orders of magnitude cheaper to build and operate than what they replace. And that's about it; I was going to respond point by point, but your post displays a general lack of knowledge of large-scale hadoop deployments, so it's basically a waste of time. You can't even respond to a single point? I'm sorry to hear that. I have been polite and respectful to you, can you pay me the same courtesy?