On Sat, Mar 18, 2017 at 2:56 AM, Elvis Pranskevichus <elpr...@gmail.com> wrote:
> Currently, clients wishing to know when the server exits hot standby
> have to resort to polling, which is often suboptimal.
> This adds the new "in_hot_standby" GUC variable that is reported via a
> ParameterStatus message.  This allows the clients to:
>    (a) know right away that they are connected to a server in hot
>        standby; and
>    (b) know immediately when a server exits hot standby.
> This change will be most beneficial to various connection pooling
> systems (pgpool etc.)

Why adding a good chunk of code instead of using pg_is_in_recovery(),
which switches to false once a server exits recovery?

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