Re: Force streaming every change in logical decoding - Mailing list pgsql-hackers

On Fri, Dec 23, 2022 at 2:03 PM shiy.fnst@fujitsu.com <shiy.fnst@fujitsu.com> wrote:
>
> On Fri, Dec 23, 2022 1:50 PM Amit Kapila <amit.kapila16@gmail.com>
> >
> > On Thu, Dec 22, 2022 at 6:18 PM shiy.fnst@fujitsu.com
> > <shiy.fnst@fujitsu.com> wrote:
> > >
> > >
> > > Besides, I tried to reduce data size in streaming subscription tap tests by this
> > > new GUC (see 0002 patch). But I didn't covert all streaming tap tests
> > because I
> > > think we also need to cover the case that there are lots of changes. So, 015*
> > is
> > > not modified. And 017* is not modified because streaming transactions and
> > > non-streaming transactions are tested alternately in this test.
> > >
> >
> > I think we can remove the newly added test from the patch and instead
> > combine the 0001 and 0002 patches. I think we should leave the
> > 022_twophase_cascade as it is because it can impact code coverage,
> > especially the below part of the test:
> > # 2PC PREPARE with a nested ROLLBACK TO SAVEPOINT
> > $node_A->safe_psql(
> >     'postgres', "
> >     BEGIN;
> >     INSERT INTO test_tab VALUES (9999, 'foobar');
> >     SAVEPOINT sp_inner;
> >     INSERT INTO test_tab SELECT i, md5(i::text) FROM
> > generate_series(3, 5000) s(i);
> >
> > Here, we will stream first time after the subtransaction, so can
> > impact the below part of the code in ReorderBufferStreamTXN:
> > if (txn->snapshot_now == NULL)
> > {
> > ...
> > dlist_foreach(subxact_i, &txn->subtxns)
> > {
> > ReorderBufferTXN *subtxn;
> >
> > subtxn = dlist_container(ReorderBufferTXN, node, subxact_i.cur);
> > ReorderBufferTransferSnapToParent(txn, subtxn);
> > }
> > ...
> >
>
> OK, I removed the modification in 022_twophase_cascade.pl and combine the two patches.
>
> Please see the attached patch.
> I also fixed Kuroda-san's comments[1].
>
> [1] https://www.postgresql.org/message-id/TYAPR01MB5866CD99CF86EAC84119BC91F5E99%40TYAPR01MB5866.jpnprd01.prod.outlook.com
>
> Regards,
> Shi yu