Re: Deadlock between concurrent index builds on different tables

> On 22 Dec 2017, at 22:53, Jeremy Finzel <finzelj@gmail.com> wrote:
>
> 2017-12-22 15:48:07.669 CST,"CREATE INDEX",2017-12-22 15:48:02 CST,8/32,0,ERROR,40P01,"deadlock detected","Process
4470waits for ShareLock on virtual transaction 4/262; blocked by process 4466. 
> Process 4466 waits for ShareLock on virtual transaction 8/32; blocked by process 4470.
> Process 4470: CREATE INDEX CONCURRENTLY index_foo_on_created_at ON foo USING btree (created_at);
> Process 4466: CREATE INDEX CONCURRENTLY index_bar_on_id ON bar USING btree (id);","See server log for query
details.",,,,"CREATEINDEX CONCURRENTLY index_foo_on_created_at ON foo USING btree (created_at);",,,"" 

If I read these logs correctly, you are creating the exact same index on foo (created_at) in both processes, which is
justwhat you were trying to prevent doing. 

Alban Hertroys
--
If you can't see the forest for the trees,
cut the trees and you'll find there is no forest.