FOSDEM 2019 - PostgreSQL vs. fsync

How is it possible that PostgreSQL used fsync incorrectly for 20 years, and what we'll do about it. About a year ago the PostgreSQL community discovered that fsync (on Linux and some BSD systems) may not work the way we always thought it is, with possibly disastrous consequences for data durability/consistency (which is something the PostgreSQL community really values). I'll walk you through fsync