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Re: Streaming replication, retrying from archive

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>
Cc: Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Streaming replication, retrying from archive
Date: 2010-01-14 14:36:11
Message-ID: 603c8f071001140636p2551a086w451a9bb0a96fa2c4@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On Thu, Jan 14, 2010 at 9:15 AM, Heikki Linnakangas
<heikki(dot)linnakangas(at)enterprisedb(dot)com> wrote:
> Imagine this scenario:
>
> 1. Master is up and running, standby is connected and streaming happily
> 2. Network goes down, connection is broken.
> 3. Standby falls behind a lot. Old WAL files that the standby needs are
> archived, and deleted from master.
> 4. Network is restored. Standby reconnects
> 5. Standby will get an error because the WAL file it needs is not in the
> master anymore.
>
> What will currently happen is:
>
> 6, Standby retries connecting and failing indefinitely, until the admin
> restarts it.
>
> What we would *like* to happen is:
>
> 6. Standby fetches the missing WAL files from archive, then reconnects
> and continues streaming.
>
> Can we fix that?

Just MHO here, but this seems like a bigger project than we should be
starting at this stage of the game.

...Robert

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