Re: PGStream synchronization

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От Oliver Jowett
Тема Re: PGStream synchronization
Дата
Msg-id 4A95CE4B.5050107@opencloud.com
обсуждение исходный текст
Ответ на Re: PGStream synchronization  (Maciek Sakrejda <msakrejda@truviso.com>)
Ответы Re: PGStream synchronization
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Maciek Sakrejda wrote:

> I'm not really sure if there's another clean approach, though. I'm
> attaching a patch that takes another dirty approach, but other than
> the fact that it seems to work, I don't really like it at all. The
> basic idea is to cancel whatever you're doing before closing the
> connection: if there's an active copy, have the executor send a
> CopyFail; otherwise, have the ProtocolConnectionImpl request a query
> cancellation.

This seems a bit heavyweight because cancelling a query isn't a trivial
amount of work, and it'll happen whenever close() is called if I read
your patch correctly. 99% of apps are effectively single-threaded so it
seems expensive to always do this when it's rarely needed ..

-O

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