Re: BUG #16643: PG13 - Logical replication - initial startup never finishes and gets stuck in startup loop

On Wed, Nov 4, 2020 at 7:19 PM Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> wrote:
>
> On 2020-Nov-04, Amit Kapila wrote:
>
> > On Thu, Oct 15, 2020 at 8:20 PM Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> wrote:
>
> > > * STREAM COMMIT bug?
> > > In apply_handle_stream_commit, we do CommitTransactionCommand, but
> > > apparently in a tablesync worker we shouldn't do it.
> >
> > In the tablesync stage, we don't allow streaming. See pgoutput_startup
> > where we disable streaming for the init phase. As far as I understand,
> > for tablesync we create the initial slot during which streaming will
> > be disabled then we will copy the table (here logical decoding won't
> > be used) and then allow the apply worker to get any other data which
> > is inserted in the meantime. Now, I might be missing something here
> > but if you can explain it a bit more or share some test to show how we
> > can reach here via tablesync worker then we can discuss the possible
> > solution.
>
> Hmm, okay, that sounds like there would be no bug then. Maybe what we
> need is just an assert in apply_handle_stream_commit that
> !am_tablesync_worker(), as in the attached patch. Passes tests.
>

+1. But do we want to have this Assert only in stream_commit API or
all stream APIs as well?

--
With Regards,
Amit Kapila.