| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | James Mansion <james(at)mansionfamily(dot)plus(dot)com> |
| Cc: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Константин Книжник <knizhnik(at)garret(dot)ru>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, David Fetter <david(at)fetter(dot)org>, PG Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [ANNOUNCE] IMCS: In Memory Columnar Store for PostgreSQL |
| Date: | 2014-01-06 21:16:38 |
| Message-ID: | CA+TgmoaAKAHtsZtXUBVy+G3zU75iGxww4vFfvhNd4sCvUjDH9A@mail.gmail.com |
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| Lists: | pgsql-announce pgsql-hackers |
On Mon, Jan 6, 2014 at 4:04 PM, james <james(at)mansionfamily(dot)plus(dot)com> wrote:
> The point remains that you need to duplicate it into every process that
> might
> want to use it subsequently, so it makes sense to DuplicateHandle into the
> parent, and then to advertise that handle value publicly so that other
> child
> processes can DuplicateHandle it back into their own process.
Well, right now we just reopen the same object from all of the
processes, which seems to work fine and doesn't require any of this
complexity. The only problem I don't know how to solve is how to make
a segment stick around for the whole postmaster lifetime. If
duplicating the handle into the postmaster without its knowledge gets
us there, it may be worth considering, but that doesn't seem like a
good reason to rework the rest of the existing mechanism.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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