PG13 partitioned table logical replication

[Nicolas Sornin]

Dear community,

I just made some test of upcoming version of porstgresql, especially the 
ability to publish partitioned table via root partition.
I tried to setup PG13 to PG12 replication with different partitioning schemes.

My first attempt was to replicate time partitioned table in PG13 cluster to a 
regular table in PG12 cluster, but after looking at the logs I saw the 
following error :

2020-09-09 12:21:33.964 CEST [22976] LOG:  logical replication table 
synchronization worker for subscription "rep_part_sub", table "stock_sales" has 
started
2020-09-09 12:21:33.997 CEST [22976] ERROR:  table "public.stock_sales" not 
found on publisher
2020-09-09 12:21:33.999 CEST [20346] LOG:  background worker "logical 
replication worker" (PID 22976) exited with exit code 1

While not being aware of underlying mechanics of logical replication, I was 
expecting this use case to work given table names and column names/types are 
the same on both sides.

Is this the intended behavior and simply out of the scope of the changes 
introduced by PG13 ?

Thank you,
Best regards,


Nicolas SORNIN
IT Team Lead

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RE: PG13 partitioned table logical replication

[Nicolas Sornin]

Hello Peter,

That's what I thought. I'll find another way.
Thank you for your time.

Regards,

Nicolas SORNIN    
IT Team Lead


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intended recipient(s) and may contain confidential and privileged information. 
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-Message d'origine-
De : Peter Eisentraut  
Envoyé : jeudi 10 septembre 2020 17:04
À : Nicolas Sornin ; pgsql-gene...@postgresql.org
Objet : Re: PG13 partitioned table logical replication

On 2020-09-10 14:13, Nicolas Sornin wrote:
> I just made some test of upcoming version of porstgresql, especially 
> the ability to publish partitioned table via root partition.
> 
> I tried to setup PG13 to PG12 replication with different partitioning 
> schemes.
> 
> My first attempt was to replicate time partitioned table in PG13 
> cluster to a regular table in PG12 cluster, but after looking at the 
> logs I saw the following error :
> 
> 2020-09-09 12:21:33.964 CEST [22976] LOG:  logical replication table 
> synchronization worker for subscription "rep_part_sub", table 
> "stock_sales" has started
> 
> 2020-09-09 12:21:33.997 CEST [22976] ERROR:  table "public.stock_sales" 
> not found on publisher
> 
> 2020-09-09 12:21:33.999 CEST [20346] LOG:  background worker "logical 
> replication worker" (PID 22976) exited with exit code 1
> 
> While not being aware of underlying mechanics of logical replication, 
> I was expecting this use case to work given table names and column 
> names/types are the same on both sides.
> 
> Is this the intended behavior and simply out of the scope of the 
> changes introduced by PG13 ?

When the subscriber running on PG12 is trying to fetch information about the 
table from the publisher, it is looking for a real table, which it doesn't 
find, because it's a partitioned table.  So this combination doesn't work.

-- 
Peter Eisentraut  http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services