From: | Andrew Dunstan <andrew(at)dunslane(dot)net> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Greg Smith <greg(at)2ndquadrant(dot)com>, Joachim Wieland <joe(at)mcknight(dot)de>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: WIP patch for parallel pg_dump |
Date: | 2010-12-06 15:50:28 |
Message-ID: | 4CFD0644.2020100@dunslane.net |
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Lists: | pgsql-hackers |
On 12/06/2010 10:40 AM, Tom Lane wrote:
> Robert Haas<robertmhaas(at)gmail(dot)com> writes:
>> On Mon, Dec 6, 2010 at 9:45 AM, Heikki Linnakangas
>> <heikki(dot)linnakangas(at)enterprisedb(dot)com> wrote:
>>> Well, then you need some sort of cross-backend communication, which is
>>> always a bit clumsy.
>> A temp file seems quite sufficient, and not at all difficult.
> "Not at all difficult" is nonsense. To do that, you need to invent some
> mechanism for sender and receivers to identify which temp file they want
> to use, and you need to think of some way to clean up the files when the
> client forgets to tell you to do so. That's going to be at least as
> ugly as anything else. And I think it's unproven that this approach
> would be security-hole-free either. For instance, what about some other
> session overwriting pg_dump's snapshot temp file?
>
>
Yeah. I'm still not convinced that using shared memory is a bad way to
pass these around. Surely we're not talking about large numbers of them.
What am I missing here?
cheers
andrew
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