Re: Adding REPACK [concurrently]

On 2026-Mar-16, Matthias van de Meent wrote:

> On Mon, 16 Mar 2026 at 21:15, Antonin Houska <ah@cybertec.at> wrote:

> > Anyway (fortunately?), the concurrent use of slots by REPACK is limited
> > because, during the initialization of logical decoding, the backend needs to
> > wait for all the transactions having XID assigned to finish, and these include
> > the already running REPACK commands. See SnapBuildWaitSnapshot() and callers
> > if you're interested in details.
> 
> Huh, so would you be able to run more than one Repack Concurrently in
> the same database? ISTM that would not be possible, apart from
> possibly a mechanism comparable to the SAFE_IN_IC flag (to not wait on
> those backends).

Yeah, this sounds kind of bad news ...

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