On Wed, May 28, 2014 at 11:26 PM, Steven Walling <swalling@wikimedia.org> wrote:
My main question is what the rationale is. Is it to improve query performance on analytics dbs?

I imagine it will help, but it's probably not the primary reason. I imagine Sean would like to have the database in a state of equilibrium such that there are no looming dangers, and no reason in principle why things couldn't just keep running. At the moment the clip of incoming events is prone to sharp fluctuations and there is no protocol in place for handling exhausted server capacity. Sean is our only(!) DBA and if the database server goes out, he gets paged, and it's on him to sort it out. We need to do better by him, IMO.