[pgpool-general: 5955] Re: pgpool load balancing problem

[Mariel Cherkassky]

When you say compile it yourself you mean run make and make install again ?

2018-02-28 18:39 GMT+02:00 Mathias Buresch <mathias.buresch at de.clara.net>:

> Hi,
>
> at the top of the link I posted there is a link called “patch”
>
> https://git.postgresql.org/gitweb/?p=pgpool2.git;a=commit;h=
> e8baa3f0ee1a24f833cfa6cc5d0104b5cefe7b04
>
> But here is the direct-link -> https://git.postgresql.org/
> gitweb/?p=pgpool2.git;a=patch;h=e8baa3f0ee1a24f833cfa6cc5d0104b5cefe7b04
>
> As I mentioned only if you compile it by yourself because this will patch
> the sources.
>
> Mit herzlichen Grüßen
>
> Mathias Buresch
> Systems Engineer
> --
> mathias.buresch at de.clara.net
> Tel: +49 (69) 40 80 18 - 265
> Fax: +49 (69) 40 80 18 - 129
>
> Claranet GmbH
> Hanauer Landstraße 196
> <https://maps.google.com/?q=Hanauer+Landstra%C3%9Fe+196+60314+Frankfurt&entry=gmail&source=g>
> 60314 Frankfurt
> <https://maps.google.com/?q=Hanauer+Landstra%C3%9Fe+196+60314+Frankfurt&entry=gmail&source=g>
>
> Geschäftsführung Olaf Fischer
> Hrb 50381 AG Frankfurt am Main
> Vat-ID de 812918694
>
> http://www.claranet.de
>
>
>
>
> On 28. Feb 2018, at 17:36, Mariel Cherkassky <mariel.cherkassky at gmail.com>
> wrote:
>
> Hi,
> first of all thanks !
> Can you attach the patch you mentioned ? or a link to the patch ?
>
> 2018-02-28 18:15 GMT+02:00 Mathias Buresch <mathias.buresch at de.clara.net>:
>
>> Hi,
>>
>> I reported that problem yesterday too. Maybe someone did it already
>> before me..
>>
>> I don’t know if you can access this -> Re: [pgpool-general: 5939] Re:
>> PgPool 3.7.2 forwards write statements to Standby
>> .. But here is the explanation in short:
>>
>> *Problem: (posted by Tatsuo Ishii)*
>>
>> Today I have just found a serious regression in 3.7.2: it does not
>> work if the primary is other than node 0, sending write queries to
>> node 0, which is the standby (In my testing, 3.7.2 does work if the
>> primary is node 0). I guess your primary is not node 0, right?
>>
>> The cause was this commit [1]:
>> https://git.postgresql.org/gitweb/?p=pgpool2.git;a=commit;h=
>> 36517db60a829422d382debb7aa3256fac5da26d
>>
>> So I today reverted the commit [2]:
>> https://git.postgresql.org/gitweb/?p=pgpool2.git;a=commit;h=
>> e8baa3f0ee1a24f833cfa6cc5d0104b5cefe7b04
>>
>> Until 3.7.3 is released, you could:
>>
>> 1) Let node 0 to be the primary
>>
>> 2) down grade to 3.7.1
>>
>> 3) Apply the patch [2] to 3.7.2.
>>
>> Sorry for the inconvenience.
>>
>>
>> *Solution:*
>>
>> If you compile the software by yourself you could enable the patch
>> provided by him.
>> Or install the 3.7.1 for RedHat.
>> If you run Ubuntu (like me) then you can download old Deb and install the
>> old packages (libpgpool0, pgpool2, postgresql-xx.pgpool2).
>> -> http://atalia.postgresql.org/morgue/p/pgpool2/ (don’t forget to set
>> packages on “hold”)
>>
>>
>>
>>
>> Mit herzlichen Grüßen
>>
>> Mathias Buresch
>> Systems Engineer
>> --
>> mathias.buresch at de.clara.net
>> Tel: +49 (69) 40 80 18 - 265
>> Fax: +49 (69) 40 80 18 - 129
>>
>> Claranet GmbH
>> Hanauer Landstraße 196
>> <https://maps.google.com/?q=Hanauer+Landstra%C3%9Fe+196+60314+Frankfurt&entry=gmail&source=g>
>> 60314 Frankfurt
>> <https://maps.google.com/?q=Hanauer+Landstra%C3%9Fe+196+60314+Frankfurt&entry=gmail&source=g>
>>
>> Geschäftsführung Olaf Fischer
>> Hrb 50381 AG Frankfurt am Main
>> Vat-ID de 812918694
>>
>> http://www.claranet.de
>>
>>
>>
>>
>> On 28. Feb 2018, at 17:05, Mariel Cherkassky <mariel.cherkassky at gmail.com>
>> wrote:
>>
>> Hi,
>> I found a problem that had a big impact on our servers. I'm using pgpool
>> as a load balancer and pool connections manager. When a user tries to run a
>> select query it redirects the query to the slave. If the user tries after
>> that to run dml or ddl command he get error :
>>
>> ERROR: cannot execute CREATE TABLE in a read-only transaction
>> SQL state: 25006
>>
>> Is there any way to solve this issue ? It means that once the pool
>> redirected your session to the slaves you cant run any ddl/dml actions ..
>> _______________________________________________
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>>
>>
>>
>
>
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