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doc: a witness server is also relevant for primary visibility consensus checks

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Clarify documentation and example to make it clear that a witness
server, if present, is also used for primary visibility consensus
checks.
This commit is contained in:
Ian Barwick
2020-02-24 15:25:15 +09:00
parent 0c270242a3
commit 0c8a636293
2 changed files with 8 additions and 7 deletions
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11
doc/repmgrd-automatic-failover.xml
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@@ -192,8 +192,8 @@
connected. Beginning with <link linkend="release-4.4">&repmgr; 4.4</link>
it is now possible for the affected standbys to build a consensus about whether
the primary is still available to some standbys (&quot;primary visibility consensus&quot;).
This is done by polling each standby for the time it last saw the primary;
if any have seen the primary very recently, it's reasonable
This is done by polling each standby (and the witness, if present) for the time it last saw the
primary; if any have seen the primary very recently, it's reasonable
to infer that the primary is still available and a failover should not be started.
</para>
@@ -205,9 +205,10 @@
<programlisting>$ repmgr -f /etc/repmgr.conf service status
ID | Name | Role | Status | Upstream | repmgrd | PID | Paused? | Upstream last seen
----+-------+---------+-----------+----------+---------+-------+---------+--------------------
1 | node1 | primary | * running | | running | 96563 | no | n/a
2 | node2 | standby | running | node1 | running | 96572 | no | 1 second(s) ago
3 | node3 | standby | running | node1 | running | 96584 | no | 0 second(s) ago</programlisting>
1 | node1 | primary | * running | | running | 27259 | no | n/a
2 | node2 | standby | running | node1 | running | 27272 | no | 1 second(s) ago
3 | node3 | standby | running | node1 | running | 27282 | no | 0 second(s) ago
4 | node4 | witness | * running | node1 | running | 27298 | no | 1 second(s) ago</programlisting>
</para>

4
doc/repmgrd-configuration.xml
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@@ -394,8 +394,8 @@
</indexterm>
<para>
If <literal>true</literal>, only continue with failover if no standbys have seen
the primary node recently.
If <literal>true</literal>, only continue with failover if no standbys
(or the witness server, if present) have seen the primary node recently.
</para>
<note>
<para>