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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>
The receiving process can send a status update back to the sender at
any time, using the following message format (also in the payload of
a CopyData message):
The receiving process can send replies back to the sender at any time,
using one of the following message formats (also in the payload of a
CopyData message):
</para>
<para>
@ -1545,6 +1545,63 @@ The commands accepted in walsender mode are:
</varlistentry>
</variablelist>
</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>
</varlistentry>