BUG #18203: Logical Replication initial sync failure

From: PG Bug reporting form <noreply(at)postgresql(dot)org>
To: pgsql-bugs(at)lists(dot)postgresql(dot)org
Cc: zzzzz(dot)graf(at)gmail(dot)com
Subject: BUG #18203: Logical Replication initial sync failure
Date: 2023-11-18 01:25:52
Message-ID: 18203-df37fe354b626670@postgresql.org
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The following bug has been logged on the website:

Bug reference: 18203
Logged by: Justin G
Email address: zzzzz(dot)graf(at)gmail(dot)com
PostgreSQL version: 15.2
Operating system: Ubuntu 20
Description:

We’ve found an edge case that breaks logical replication.

Procedure:

alter system set wal_level to 'logical' ;

create database source; --pg 11
create database destin; --pg 15

create table no_col(); -- pg 11

insert into no_col default values;
insert into no_col default values;
insert into no_col default values;
insert into no_col default values;
insert into no_col default values;

CREATE PUBLICATION no_col_pub for table no_col;

create table no_col(); --pg 15

CREATE SUBSCRIPTION no_col_sub --pg15
CONNECTION
'host=<hostname/ip>
port=5432
user=<set username>
dbname=source
password=<set the password>'
PUBLICATION no_col_pub
WITH (
CREATE_SLOT = TRUE,
ENABLED = TRUE,
COPY_DATA = TRUE
);

We now have a table with 5 null rows. This is a valid table, pg_dump will
dump it and restore it. count(*) will return 5.

The dump file produced by pg_dump version 15 generates this SQL
COPY public.no_col FROM stdin;

However, the copy command from PG 15 using logical replication includes (),
which normally has a list of columns between the parentheses.

COPY public.no_col () TO STDOUT

Logical replication worker returns with the following error:
2023-11-17 20:40:16.141 UTC [151084] ERROR: could not start initial
contents copy for table "public.no_col": ERROR: syntax error at or near
")"
LINE 1: COPY public.no_col () TO STDOUT

If the direction of replication is reversed from PG15 to PG14, the above
error is not thrown, and the 5 rows are copied over.

Version tested
Publishers PG 11.14, 14.2, 15.2
Subscriber PG 14.2, 15.2, , RDS 14.7
The error has been observed in 15.2 and in RDS PostgreSQL 14.7.

Responses

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