On Wed, Jul 31, 2019 at 12:11 PM Andres Freund <and...@anarazel.de> wrote: > > Hi, > > On 2019-07-18 16:17:22 +0800, Ning Yu wrote: > > This seems buggy as it first checks the existence of the dir and makes the > > dir if it does not exist yet, however when executing concurrently a > > possible race condition can be as below: > > > > A: does a/ exists? no > > B: does a/ exists? no > > A: try to create a/, succeed > > B: try to create a/, failed as it already exists > > Hm. I'm not really seing much of a point in making mkdir_p safe against > all of this. What's the scenario for pg where this matters? I assume > you're using it for somewhat different purposes, and that's why it is > problematic for you?
Yes, you are right, postgres itself might not run into such kind of race condition issue. The problem we encountered was on a downstream product of postgres, where multiple postgres clusters are deployed on the same machine with common parent dirs. Best Regards Ning > > Greetings, > > Andres Freund
