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Re: Hot standby and GiST page splits (was Re: WIP: Fast GiST index build)

From: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>
To: Alvaro Herrera <alvherre(at)commandprompt(dot)com>
Cc: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Hot standby and GiST page splits (was Re: WIP: Fast GiST index build)
Date: 2011-08-02 17:13:53
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Lists: pgsql-hackers
On 02.08.2011 20:06, Alvaro Herrera wrote:
> Excerpts from Heikki Linnakangas's message of mar ago 02 11:59:24 -0400 2011:
>> On 02.08.2011 15:18, Simon Riggs wrote:
>>> On Tue, Aug 2, 2011 at 12:43 PM, Heikki Linnakangas
>>> <heikki(dot)linnakangas(at)enterprisedb(dot)com>   wrote:
>>>> On 02.08.2011 14:36, Simon Riggs wrote:
>>>> Actually I think we can append the new information to the end of the page
>>>> split record, so that an old version server can read WAL generated by new
>>>> version, too.
>>> Not sure how that would work. Lengths, CRCs?
>>> Or do you mean we will support 2 versions, have them both called the
>>> same thing, just resolve which is which by the record length. Don't
>>> like that.
>> Here's a patch to do what I meant. The new fields are stored at the very
>> end of the WAL record, and you check the length to see if they're there
>> or not. The nice thing about this is that it's compatible in both
>> directions.
> Err, did you attach the wrong patch?

Yes, sorry about that. Here's the right patch.

   Heikki Linnakangas

Attachment: gist-split-hotstandby-90.patch
Description: text/x-diff (7.7 KB)

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