| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Rod Taylor <rbt(at)rbt(dot)ca> |
| Cc: | PostgreSQL Development <pgsql-hackers(at)postgresql(dot)org>, pgsql-interfaces(at)postgresql(dot)org |
| Subject: | Re: Roadmap for FE/BE protocol redesign |
| Date: | 2003-03-10 19:30:22 |
| Message-ID: | 19294.1047324622@sss.pgh.pa.us |
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| Lists: | pgsql-hackers pgsql-interfaces |
Rod Taylor <rbt(at)rbt(dot)ca> writes:
> I'd be tempted to make a startup packet that will allow libpq to revert
> back to old protocols easily enough for the future so that we can do=20
> incremental changes to the protocol.
We already have that: you send a startup packet with a version less than
the latest, and the backend speaks that version to you.
One thing I want to do though is relax the protocol-level constraints
on certain message contents: for example, if ErrorMessage becomes a
collection of labeled fields, it should be possible to add new field
types without calling it a protocol revision. The protocol need only
specify "ignore any fields whose label you do not recognize".
regards, tom lane
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