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Re: Question about switchover with PG9 replication

From: Cyril Scetbon <cyril(dot)scetbon(at)free(dot)fr>
To: Wouter D'Haeseleer <wdh(at)vasco(dot)com>
Cc: Jean-Armel Luce <jaluce06(at)gmail(dot)com>, "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org>
Subject: Re: Question about switchover with PG9 replication
Date: 2011-02-27 08:46:13
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Lists: pgsql-general
Le 07/02/2011 09:57, Wouter D'Haeseleer a écrit :
> Question 1 : is it possible to have such a replication configuration 
> with the streaming replication of PG9 (cascaded replication) ?
>     Nope, as far as I have tested pg only has 1 master and can have a
>     number of slaves, so having 2 masters is not possible.
The second host named master2 is a slave which has slaves too, not a 
master on which you can write.
> Question 2 : All the procedures I have seen describing a switchover 
> between 2 PG servers require to copy (or rsync) the database from the 
> new master (old slave) to the new slave (old master).
> Is it possible to do switchover between sites (between PGMaster1 and 
> PGMaster2) whithout copying all the database from the new PG master to 
> the new PG slave ?
> If it is not possible yet, shall it be possible in future releases ?
>     Nope this is not possible, pg requires to have an updates
>     basebackup at the slave, this is because if you loose a lot of
>     streamed wal files it is impossible for the slave to catch up and
>     have consistent data.


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