Re: wake up logical workers after ALTER SUBSCRIPTION

On Thu, Jan 5, 2023 at 10:16 AM Nathan Bossart <nathandbossart@gmail.com> wrote:
>
> On Wed, Jan 04, 2023 at 08:12:37PM -0800, Nathan Bossart wrote:
> > On Thu, Jan 05, 2023 at 09:09:12AM +0530, Amit Kapila wrote:
> >> But there doesn't appear to be any guarantee that the result for
> >> AllTablesyncsReady() will change between the time it is invoked
> >> earlier in the function and at the place you have it in the patch.
> >> This is because the value of 'table_states_valid' may not have
> >> changed. So, how is this supposed to work?
> >
> > The call to CommandCounterIncrement() should set table_states_valid to
> > false if needed.
>
> In v12, I moved the restart for two_phase mode to the end of
> process_syncing_tables_for_apply() so that we don't need to rely on another
> iteration of the loop.
>

This should work but it is better to add a comment before calling
CommandCounterIncrement() to indicate that this is for making changes
to the relation state visible.

Thinking along similar lines, won't apply worker need to be notified
of SUBREL_STATE_SYNCWAIT state change by the tablesync worker?

-- 
With Regards,
Amit Kapila.