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From: Tom Lane <[email protected]>
To: Julien Rouhaud <[email protected]>
Cc: Andrew Dunstan <[email protected]>
Cc: Alvaro Herrera <[email protected]>
Cc: David Rowley <[email protected]>
Cc: Peter Geoghegan <[email protected]>
Cc: Robert Haas <[email protected]>
Cc: [email protected]
Cc: Andrew <[email protected]>
Subject: Re: pg_dump versus hash partitioning
Date: Fri, 10 Mar 2023 22:10:14 -0500
Message-ID: <[email protected]> (raw)
In-Reply-To: <20230311030154.pg63uspio35h4a6t@jrouhaud>
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Julien Rouhaud <[email protected]> writes:
> Working on some side project that can cause dump of hash partitions to be
> routed to a different partition, I realized that --load-via-partition-root can
> indeed cause deadlock in such case without FK dependency or anything else.

> The problem is that each worker will perform a TRUNCATE TABLE ONLY followed by
> a copy of the original partition's data in a transaction, and that obviously
> will lead to deadlock if the original and locked partition and the restored
> partition are different.

Oh, interesting.  I wonder if we can rearrange things to avoid that.

			regards, tom lane

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