Re: Support logical replication of DDLs

On Sat, 19 Mar 2022 at 01:25, Zheng Li <zhengli10(at)gmail(dot)com> wrote:
> Hello,
>
> Thanks for the quick review!
>
>> And, when I try to use git am to apply the patch, it complains:
>>
>> $ git am ~/0001-syntax-pg_publication-pg_dump-ddl_replication.patch
>> Patch format detection failed.
>
> git apply works for me. I'm not sure why git am complains.
> I also created a git branch to make code sharing easier, please try this out:
> https://github.com/zli236/postgres/tree/ddl_replication
>

Yeah, I can use git apply, I'm not sure how did you generate the patch.

>> I also think that ddl = '' isn't a good way to disable DDL replication, how
>> about using ddl = 'none' or something else?
>
> The syntax follows the existing convention of the WITH publish option.
> For example in CREATE PUBLICATION mypub WITH (publish = '')
> it means don't publish any DML change. So I'd leave it as is for now.
>

Agreed.

>> The test_decoding test case cannot work as expected, see below:
> .....
>> DDL message: transactional: 1 prefix: role: redacted, search_path: "$user", public, sz: 47 content:CREATE TABLE tab1 (id serial unique, data int);
>> BEGIN
>> sequence public.tab1_id_seq: transactional:1 last_value: 1 log_cnt: 0 is_called:0
>>
>> Since the DDL message contains the username, and we try to replace the username with 'redacted' to avoid this problem,
>>
>> \o | sed 's/role.*search_path/role: redacted, search_path/g'
>>
>> However, the title and dash lines may have different lengths for different
>> usernames. To avoid this problem, how about using a specified username when
>> initializing the database for this regression test?
>
> I don't understand the question, do you have an example of when the
> test doesn't work? It runs fine for me.
>

You should use a different user that has different length from your current one.
For example:

px(at)localhost$ make check-world

>
>> t/002_pg_dump.pl .............. 13/?
>> # Failed test 'binary_upgrade: should dump CREATE PUBLICATION pub1'
>> # at t/002_pg_dump.pl line 3916.
>> # Review binary_upgrade results in /home/px/Codes/postgresql/Debug/src/bin/pg_dump/tmp_check/tmp_test_jgRI
> ......
>> Failed 84/7709 subtests
>> t/003_pg_dump_with_server.pl .. ok
>> t/010_dump_connstr.pl ......... ok
>>
>> Test Summary Report
>> -------------------
>> t/002_pg_dump.pl (Wstat: 21504 Tests: 7709 Failed: 84)
>
> This is fixed in the latest version. I need to remind myself to run
> make check-world in the future.
>

Thanks for updating the patch.

--
Regrads,
Japin Li.
ChengDu WenWu Information Technology Co.,Ltd.