From: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
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To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Greg Stark <gsstark(at)mit(dot)edu>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Magnus Hagander <magnus(at)hagander(dot)net> |
Subject: | Re: Streaming a base backup from master |
Date: | 2010-09-03 15:38:35 |
Message-ID: | 4C81167B.8020307@enterprisedb.com |
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Lists: | pgsql-hackers |
On 03/09/10 18:01, Tom Lane wrote:
> Heikki Linnakangas<heikki(dot)linnakangas(at)enterprisedb(dot)com> writes:
>> On 03/09/10 15:16, Greg Stark wrote:
>>> On Fri, Sep 3, 2010 at 12:19 PM, Heikki Linnakangas
>>> <heikki(dot)linnakangas(at)enterprisedb(dot)com> wrote:
>>>> * We need a smarter way to do pg_start/stop_backup() with this. At the
>>>> moment, you can only have one backup running at a time, but we shouldn't
>>>> have that limitation with this built-in mechanism.
>>>
>>> Well there's no particular reason we couldn't support having multiple
>>> pg_start_backup() pending either. It's just not usually something
>>> people have need so far.
>
>> The backup label file makes that hard. There can be only one at a time.
>
> I don't actually see a use-case for streaming multiple concurrent
> backups. How many people are going to be able to afford that kind of
> load on the master's I/O bandwidth?
It's more a matter of convenience when you're setting up test
environments with small databases or something like that. I don't see
many people regularly using the streaming backup for anything larger
than a few hundred gigabytes anyway. At that point you'll most likely
want to use something more efficient.
> Certainly for version 1, it would be sufficient to throw an error if
> someone tries to start a backup while another one is in progress.
> *Maybe*, down the road, we'd want to relax it.
Yeah, it's OK for 1st version.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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