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Add a SHOW command to the replication command language.

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This is useful infrastructure for an upcoming proposed patch to
allow the WAL segment size to be changed at initdb time; tools like
pg_basebackup need the ability to interrogate the server setting.
But it also doesn't seem like a bad thing to have independently of
that; it may find other uses in the future.

Robert Haas and Beena Emerson.  (The original patch here was by
Beena, but I rewrote it to such a degree that most of the code
being committed here is mine.)

Discussion: http://postgr.es/m/CA+TgmobNo4qz06wHEmy9DszAre3dYx-WNhHSCbU9SAwf+9Ft6g@mail.gmail.com
This commit is contained in:
Robert Haas
2017-01-24 16:59:18 -05:00
parent a84069d935
commit d1ecd53947
7 changed files with 151 additions and 10 deletions
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24
doc/src/sgml/protocol.sgml
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@ -1393,6 +1393,30 @@ The commands accepted in walsender mode are:
</listitem>
</varlistentry>
<varlistentry>
<term><literal>SHOW</literal> <replaceable class="parameter">name</replaceable>
<indexterm><primary>SHOW</primary></indexterm>
</term>
<listitem>
<para>
Requests the server to send the current setting of a run-time parameter.
This is similar to the SQL command <xref linkend="sql-show">.
</para>
<variablelist>
<varlistentry>
<term><replaceable class="parameter">name</></term>
<listitem>
<para>
The name of a run-time parameter. Available parameters are documented
in <xref linkend="runtime-config">.
</para>
</listitem>
</varlistentry>
</variablelist>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>TIMELINE_HISTORY</literal> <replaceable class="parameter">tli</replaceable>
<indexterm><primary>TIMELINE_HISTORY</primary></indexterm>