Re: Logical replication timeout problem

On Fri, Jan 20, 2023 at 3:35 PM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
>
> On Fri, Jan 20, 2023 at 7:40 AM Peter Smith <smithpb2250(at)gmail(dot)com> wrote:
> >
> > Here are some review comments for patch v3-0001.
> >
> > ======
> > src/backend/replication/logical/logical.c
> >
> > 3. forward declaration
> >
> > +/* update progress callback */
> > +static void update_progress_cb_wrapper(ReorderBuffer *cache,
> > + ReorderBufferTXN *txn,
> > + ReorderBufferChange *change);
> >
> > I felt this function wrapper name was a bit misleading... AFAIK every
> > other wrapper really does just wrap their respective functions. But
> > this one seems a bit different because it calls the wrapped function
> > ONLY if some threshold is exceeded. IMO maybe this function could have
> > some name that conveys this better:
> >
> > e.g. update_progress_cb_wrapper_with_threshold
> >
>
> I am wondering whether it would be better to move the threshold logic
> to the caller. Previously this logic was inside the function because
> it was being invoked from multiple places but now that won't be the
> case. Also, then your concern about the name would also be addressed.
>
> >
> > ~
> >
> > 7b.
> > Would it be neater to just call OutputPluginUpdateProgress here instead?
> >
> > e.g.
> > BEFORE
> > ctx->update_progress(ctx, ctx->write_location, ctx->write_xid, false);
> > AFTER
> > OutputPluginUpdateProgress(ctx, false);
> >
>
> We already check whether ctx->update_progress is defined or not which
> is the only extra job done by OutputPluginUpdateProgress but probably
> we can consolidate the checks and directly invoke
> OutputPluginUpdateProgress.
>

Yes, I saw that, but I thought it was better to keep the early exit
from update_progress_cb_wrapper, so incurring just one additional
boolean check for every 100 changes was not anything to worry about.

------
Kind Regards,
Peter Smith.
Fujitsu Australia.