On Dec 13, 2013, at 1:49 PM, Merlin Moncure <mmonc...@gmail.com> wrote:
> Is this an edge case or something that will hit a lot of users?

My understanding (Tom can correct me if I'm wrong, I'm sure) is that it is an 
issue for servers on 9.3.2 where there are a lot of query cancellations due to 
facilities like statement_timeout or lock_timeout that cancel a query 
asynchronously.  I assume pg_cancel_backend() would apply as well.

We've only seen it on one client, and that client had a *lot* (thousands on 
thousands) of statement_timeout cancellations.

-- Christophe Pettus

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