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Author SHA1 Message Date
Ian Barwick
65965b3ba4 4.4rc1 2019-06-20 16:21:54 +09:00
Ian Barwick
629d2b8f85 doc: clean up release notes
Remove tabs.
2019-06-20 16:18:41 +09:00
Ian Barwick
23c285b73b doc: fix typo 2019-06-12 16:29:17 +09:00
Ian Barwick
915fb7d617 note that "standby follow" requires a primary to be available
While it's technically possible to have a standby follow another
standby while the primary is not available, repmgr will not be able
to update its metadata, which will cause Confusion and Chaos.

Update the documentation to make this clear, and provide a more helpful
error message if this situation occurs. The operation previously
failed anyway, but with an unhelpful message about not being able to
find a node record.
2019-06-11 15:18:41 +09:00
6 changed files with 216 additions and 191 deletions

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@@ -24,6 +24,7 @@
repmgr: ensure BDR2-specific functionality cannot be used on repmgr: ensure BDR2-specific functionality cannot be used on
BDR3 and later (Ian) BDR3 and later (Ian)
repmgr: canonicalize the data directory path (Ian) repmgr: canonicalize the data directory path (Ian)
repmgr: note that "standby follow" requires a primary to be available (Ian)
repmgrd: monitor standbys attached to primary (Ian) repmgrd: monitor standbys attached to primary (Ian)
repmgrd: add "primary visibility consensus" functionality (Ian) repmgrd: add "primary visibility consensus" functionality (Ian)
repmgrd: fix memory leak which occurs while the monitored PostgreSQL repmgrd: fix memory leak which occurs while the monitored PostgreSQL

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@@ -43,6 +43,14 @@
</para> </para>
</listitem> </listitem>
<listitem>
<para>
<link linkend="repmgr-standby-follow"><command>repmgr standby follow</command></link>:
note that an active, reachable cluster primary is required for this command;
and provide a more helpful error message if no reachable primary could be found.
</para>
</listitem>
<listitem> <listitem>
<para> <para>
&repmgr;: when executing <link linkend="repmgr-standby-switchover"><command>repmgr standby switchover</command></link>, &repmgr;: when executing <link linkend="repmgr-standby-switchover"><command>repmgr standby switchover</command></link>,
@@ -75,7 +83,6 @@
</para> </para>
</listitem> </listitem>
<listitem> <listitem>
<para> <para>
<link linkend="repmgr-standby-promote"><command>repmgr standby promote</command></link>: <link linkend="repmgr-standby-promote"><command>repmgr standby promote</command></link>:

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@@ -20,22 +20,17 @@
(&quot;follow target&quot;). Typically this will be the primary, but this (&quot;follow target&quot;). Typically this will be the primary, but this
command can also be used to attach the standby to another standby. command can also be used to attach the standby to another standby.
</para> </para>
<para> <para>
This command requires a valid This command requires a valid <filename>repmgr.conf</filename> file for the standby,
<filename>repmgr.conf</filename> file for the standby, either specified either specified explicitly with <literal>-f/--config-file</literal> or located in a
explicitly with <literal>-f/--config-file</literal> or located in a
default location; no additional arguments are required. default location; no additional arguments are required.
</para> </para>
<para> <para>The standby node (&quot;follow candidate&quot;) <emphasis>must</emphasis>
By default &repmgr; will attempt to attach the standby to the current primary. be running. If the new upstream (&quot;follow target&quot;) is not the primary,
If <option>--upstream-node-id</option> is provided, &repmgr; will attempt the cluster primary <emphasis>must</emphasis> be running and accessible from the
to attach the standby to the specified node, which can be another standby. standby node.
</para>
<para>
This command will force a restart of the standby server, which must be
running.
</para> </para>
<tip> <tip>
@@ -45,6 +40,16 @@
</para> </para>
</tip> </tip>
<para>
By default &repmgr; will attempt to attach the standby to the current primary.
If <option>--upstream-node-id</option> is provided, &repmgr; will attempt
to attach the standby to the specified node, which can be another standby.
</para>
<para>
This command will force a restart of PostgreSQL on the standby node.
</para>
<para> <para>
<command>repmgr standby follow</command> will wait up to <command>repmgr standby follow</command> will wait up to
<varname>standby_follow_timeout</varname> seconds (default: <literal>30</literal>) <varname>standby_follow_timeout</varname> seconds (default: <literal>30</literal>)

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@@ -263,7 +263,7 @@ ALTER EXTENSION repmgr UPDATE</programlisting>
<tip> <tip>
<para> <para>
Use <command><link linkend="repmgr-node-check">repmgr node check</link></command> Use <command><link linkend="repmgr-node-check">repmgr node check</link></command>
to determine which replacation slots need to be recreated. to determine which replication slots need to be recreated.
</para> </para>
</tip> </tip>

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@@ -2784,12 +2784,6 @@ do_standby_follow(void)
PQfinish(local_conn); PQfinish(local_conn);
if (runtime_options.dry_run == true)
{
log_info(_("prerequisites for executing STANDBY FOLLOW are met"));
exit(SUCCESS);
}
/* /*
* Here we'll need a connection to the primary, if the upstream is not a primary. * Here we'll need a connection to the primary, if the upstream is not a primary.
*/ */
@@ -2802,12 +2796,30 @@ do_standby_follow(void)
primary_conn = get_primary_connection_quiet(follow_target_conn, primary_conn = get_primary_connection_quiet(follow_target_conn,
&primary_node_id, &primary_node_id,
NULL); NULL);
/*
* If follow target is not primary and no other primary could be found,
* abort because we won't be able to update the node record.
*/
if (PQstatus(primary_conn) != CONNECTION_OK)
{
log_error(_("unable to determine the cluster primary"));
log_detail(_("an active primary node is required for \"repmgr standby follow\""));
PQfinish(follow_target_conn);
exit(ERR_FOLLOW_FAIL);
}
} }
else else
{ {
primary_conn = follow_target_conn; primary_conn = follow_target_conn;
} }
if (runtime_options.dry_run == true)
{
log_info(_("prerequisites for executing STANDBY FOLLOW are met"));
exit(SUCCESS);
}
initPQExpBuffer(&follow_output); initPQExpBuffer(&follow_output);
success = do_standby_follow_internal( success = do_standby_follow_internal(

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@@ -1,3 +1,3 @@
#define REPMGR_VERSION_DATE "" #define REPMGR_VERSION_DATE ""
#define REPMGR_VERSION "4.4beta2" #define REPMGR_VERSION "4.4rc1"
#define REPMGR_VERSION_NUM 40400 #define REPMGR_VERSION_NUM 40400