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Protocol documentation for Hot Standby feedback messages.

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This commit is contained in:
Robert Haas 2011-03-17 15:10:55 -04:00
parent 02b1f84e7d
commit 76dbb46153
1 changed files with 60 additions and 3 deletions
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63
doc/src/sgml/protocol.sgml
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@ -1471,9 +1471,9 @@ The commands accepted in walsender mode are:
</para> </para>
<para> <para>
The receiving process can send a status update back to the sender at The receiving process can send replies back to the sender at any time,
any time, using the following message format (also in the payload of using one of the following message formats (also in the payload of a
a CopyData message): CopyData message):
</para> </para>
<para> <para>
@ -1545,6 +1545,63 @@ The commands accepted in walsender mode are:
</varlistentry> </varlistentry>
</variablelist> </variablelist>
</para> </para>
<para>
<variablelist>
<varlistentry>
<term>
Hot Standby feedback message (F)
</term>
<listitem>
<para>
<variablelist>
<varlistentry>
<term>
Byte1('h')
</term>
<listitem>
<para>
Identifies the message as a Hot Standby feedback message.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
Byte8
</term>
<listitem>
<para>
The server's system clock at the time of transmission,
given in TimestampTz format.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
Byte4
</term>
<listitem>
<para>
The standby's current xmin.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
Byte4
</term>
<listitem>
<para>
The standby's current epoch.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</listitem> </listitem>
</varlistentry> </varlistentry>