Re: Is Recovery actually paused?

On Wed, Feb 10, 2021 at 10:02 AM Dilip Kumar <dilipbalaut@gmail.com> wrote:
>
> I don't find any problem with this approach as well, but I personally
> feel that the other approach where we don't wait in any API and just
> return the recovery pause state is much simpler and more flexible.  So
> I will make the pending changes in that patch and let's see what are
> the other opinion and based on that we can conclude.  Thanks for the
> patch.

Here is an updated version of the patch which fixes the last two open problems
1. In RecoveryRequiresIntParameter set the recovery pause state in the
loop so that if recovery resumed and pause requested again we can set
to pause again.
2. If the recovery state is already 'paused' then don't set it back to
the 'pause requested'.

One more point is that in 'pg_wal_replay_pause' even if we don't
change the state because it was already set to the 'paused' then also
we call the WakeupRecovery.  But I don't think there is any problem
with that, if we think that this should be changed then we can make
SetRecoveryPause return a bool such that if it doesn't do state change
then it returns false and in that case we can avoid calling
WakeupRecovery, but I felt that is unnecessary.  Any other thoughts on
this?

-- 
Regards,
Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com