Yes you understood correctly. Would the same apply for a hot standby situation?
On Oct 20, 2011, at 12:00 PM, Jeff Davis wrote:
> On Mon, 2011-09-26 at 08:54 -0400, Adam Tistler wrote:
>> I am trying to set up master/slave warm standby streaming replication
>> (9.1). I am not doing archiving/log shipping. I have read that you
>> cannot reverse roles between the master and slave, and that once a
>> slave is "promoted", you need to use pg_basebackup or rsync to copy
>> files from the newly promoted master to the old master. I am fine
>> with this, however, in my case all I am trying to do is re-enable the
>> slave to be in recovery mode. I am doing this by deleting the trigger
>> file ( which I had originally created to promote the slave to master )
>> and moving recovery.done to recovery.conf, then restarting postgres.
>> As a result I get the following error:
>>
>> FATAL: timeline 2 of the primary does not match recovery target
>> timeline 3
>
> Once it's promoted to a primary, you can't set it to start recovering
> from another system again (without taking a new base backup).
>
> Did I understand your question correctly?
>
> Regards,
> Jeff Davis
>
