Re: Re: BUG #13685: Archiving while idle every archive_timeout with wal_level hot_standby

From: Simon Riggs <simon(at)2ndQuadrant(dot)com>
To: David Steele <david(at)pgmasters(dot)net>
Cc: Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Re: BUG #13685: Archiving while idle every archive_timeout with wal_level hot_standby
Date: 2016-04-03 20:32:28
Message-ID: CANP8+jLKjHEtMi9SM9ui6EiPw-9CY-EwAzHJ=kt3zwpfQ5CHkw@mail.gmail.com
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On 14 March 2016 at 17:46, David Steele <david(at)pgmasters(dot)net> wrote:

> On 2/24/16 12:40 AM, Michael Paquier wrote:
>
> This has the merit to be clear, thanks for the input. Whatever the
>> approach taken at the end we have two candidates:
>> - Extend XLogInsert() with an extra argument for flags (Andres)
>> - Introduce XLogInsertExtended with this extra argument and let
>> XLogInsert() in peace (Robert and I).
>> Actually, I lied, there was still something I could do for this
>> thread: attached are two patches implementing both approaches as
>> respectively a-1 and a-2. Patch b is the set of logs I used for the
>> tests to show with a low checkpoint_timeout that checkpoints are
>> getting correctly skipped on an idle system.
>>
>
> Unfortunately neither A nor B apply anymore.
>
> However, since the patches can still be read through I wonder if Robert or
> Andres would care to opine on whether A or B is better now that they can
> see the full implementation?
>
> For my 2c I'm happy with XLogInsertExtended() since it seems to be a rare
> use case where flags are required. This can always be refactored in the
> future if/when the use of flags spreads.
>

XLogInsertExtended() is the one I would commit, if.

--
Simon Riggs http://www.2ndQuadrant.com/
<http://www.2ndquadrant.com/>
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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