On Thu, Jun 10, 2010 at 12:49 PM, Greg Stark <gsstark@mit.edu> wrote:
> On Thu, Jun 10, 2010 at 5:13 PM, Robert Haas <robertmhaas@gmail.com> wrote:
>> At this point you should have a working HS/SR setup. Now:
>>
>> 8. shut the slave down
>> 9. move recovery.conf out of the way
>> 10. restart the slave - it will do recovery and enter normal running
>> 11. make some database changes
>> 12. stop the slave
>> 13. put recovery.conf back
>> 14. restart the slave
>> 15. make a bunch of changes on the master
>>
>> When the slave then tries to replay, you then get something like:
>>
>> WARNING: invalid record length at 0/4005330
>> WARNING: invalid record length at 0/4005330
>> WARNING: invalid record length at 0/4005330
>>
>
> Woah, why does this procedure lead to this situation? I would hope
> there's nothing a user could do which would cause it short of invoking
> dd to corrupt the WAL files.
>
> At precisely which step of the procedure did the user do something
> wrong?
13.
> Is there any reason we can't detect that they've done it and
> throw a specific error message saying the configuration is invalid?
I'm not sure how we'd go about doing that, but I agree it would be nice.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise Postgres Company