Re: WIP partial replication patch

Andres Freund írta:
> On Fri, Aug 13, 2010 at 09:36:00PM +0200, Boszormenyi Zoltan wrote:
>
>> Tom Lane írta:
>>
>>> Boszormenyi Zoltan <zb(at)cybertec(dot)at> writes:
>>>
>>>
>>>> attached is a WIP patch that will eventually implement
>>>> partial replication, with the following syntax:
>>>>
>>> This fundamentally cannot work, as it relies on system catalogs to be
>>> valid during recovery.
>>>
>> Just like Hot Standby, no? What is the difference here?
>> Sorry for being ignorant.
>>
> In HS you can only connect after youve found a restartpoint - only
> after that you know that you have reached a consistent point for the
> system.
>

And in this patch, the startup process only tries to connect
after signalling the postmaster that a consistent state is reached.
And the connection has a reasonable timeout built in.

> I think this is fixable by keeping more wal on the standby's but I
> need to think more about it.
>
> Andres
>
>

Best regards,
Zoltán Böszörményi