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Introduce a new GUC_REPORT setting "in_hot_standby".

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Aside from being queriable via SHOW, this value is sent to the client
immediately at session startup, and again later on if the server gets
promoted to primary during the session.  The immediate report will be
used in an upcoming patch to avoid an extra round trip when trying to
connect to a primary server.

Haribabu Kommi, Greg Nancarrow, Tom Lane; reviewed at various times
by Laurenz Albe, Takayuki Tsunakawa, Peter Smith.

Discussion: https://postgr.es/m/CAF3+xM+8-ztOkaV9gHiJ3wfgENTq97QcjXQt+rbFQ6F7oNzt9A@mail.gmail.com
This commit is contained in:
Tom Lane
2021-01-05 16:18:01 -05:00
parent 47b2ed1d06
commit bf8a662c9a
6 changed files with 91 additions and 11 deletions
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7
doc/src/sgml/high-availability.sgml
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@@ -1859,8 +1859,11 @@ if (!triggered)
</para>
<para>
Users will be able to tell whether their session is read-only by
issuing <command>SHOW transaction_read_only</command>. In addition, a set of
Users can determine whether hot standby is currently active for their
session by issuing <command>SHOW in_hot_standby</command>.
(In server versions before 14, the <varname>in_hot_standby</varname>
parameter did not exist; a workable substitute method for older servers
is <command>SHOW transaction_read_only</command>.) In addition, a set of
functions (<xref linkend="functions-recovery-info-table"/>) allow users to
access information about the standby server. These allow you to write
programs that are aware of the current state of the database. These