On 5 May 2014 17:22, Andres Freund <[email protected]> wrote:
> On 2014-05-05 13:07:48 -0400, Tom Lane wrote:
> > Andres Freund <[email protected]> writes:
> > > On 2014-05-05 10:07:46 -0400, Tom Lane wrote:
> > >> Also, -1 for adding another log_line_prefix escape. If you're routing
> > >> multiple clusters logging to the same place (which is already a bit
> > >> unlikely IMO), you can put distinguishing strings in log_line_prefix
> > >> already. And it's not like we've got an infinite supply of letters
> > >> for those escapes.
> >
> > > Using syslog and including the same config file from multiple clusters
> > > isn't that uncommon. But I can live without it.
> >
> > So, if you are sharing a config file, how is it that you can set a
> > per-cluster cluster_name but not a per-cluster log_line_prefix?
>
> Well, it's a included file. With log_line_prefix support just
> cluster_name has to be set per cluster. Without you need string
> interpolation in the config management to include cluster_name in
> log_line_prefix.
>
Attached as cluster-name-in-ps-v3-a.patch is a new version with
the following changes:
* the brackets removed, as suggested by Tom Lane
* static initialization of cluster_name to avoid any possibility
of an uninitialized/null pointer being used before GUC
initialization, as suggested by Andres Freund
* cluster_name moved to config group CONN_AUTH_SETTINGS, on the
basis that it's similar to bonjour_name, but it isn't
really... open to suggestions for a better config_group!
* a small amount of documentation in config.sgml (with
cluster_name under Connection Settings, which probably
isn't right either)
* sample conf file updated to show cluster_name and %C in
log_line_prefix
A shorter version without the log_line_prefix support that Tom didn't
like is attached as cluster-name-in-ps-v3-b.patch. I will try to add these
to the open commitfest, and see if there is something I can usefully
review in return.
I verified that SHOW cluster_name works as expected and you can't
change it with SET.
Thanks,
Thomas Munro
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 4a33f87..0fd414e 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -681,6 +681,24 @@ include 'filename'
</listitem>
</varlistentry>
+ <varlistentry id="guc-cluster-name" xreflabel="cluster_name">
+ <term><varname>cluster_name</varname> (<type>string</type>)</term>
+ <indexterm>
+ <primary><varname>cluster_name</> configuration parameter</primary>
+ </indexterm>
+ <listitem>
+ <para>
+ Sets the cluster name that appears in the process title for all
+ processes in this cluster. No name is shown if this parameter is set
+ to the empty string <literal>''</> (which is the default). The
+ process title is typically viewed by the <command>ps</> command, or in
+ Windows by using the <application>Process Explorer</>. The cluster
+ name can also be included in the <varname>log_line_prefix</varname>.
+ This parameter can only be set at server start.
+ </para>
+ </listitem>
+ </varlistentry>
+
<varlistentry id="guc-tcp-keepalives-idle" xreflabel="tcp_keepalives_idle">
<term><varname>tcp_keepalives_idle</varname> (<type>integer</type>)</term>
<indexterm>
@@ -4212,6 +4230,11 @@ local0.* /var/log/postgresql
</thead>
<tbody>
<row>
+ <entry><literal>%C</literal></entry>
+ <entry>Cluster name</entry>
+ <entry>no</entry>
+ </row>
+ <row>
<entry><literal>%a</literal></entry>
<entry>Application name</entry>
<entry>yes</entry>
diff --git a/src/backend/utils/error/elog.c b/src/backend/utils/error/elog.c
index 977fc66..0adfee7 100644
--- a/src/backend/utils/error/elog.c
+++ b/src/backend/utils/error/elog.c
@@ -2345,6 +2345,12 @@ log_line_prefix(StringInfo buf, ErrorData *edata)
else
appendStringInfo(buf, "%lx.%x", (long) (MyStartTime), MyProcPid);
break;
+ case 'C':
+ if (padding != 0)
+ appendStringInfo(buf, "%*s", padding, cluster_name);
+ else
+ appendStringInfoString(buf, cluster_name);
+ break;
case 'p':
if (padding != 0)
appendStringInfo(buf, "%*d", padding, MyProcPid);
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 15020c4..71897b8 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -449,6 +449,7 @@ int temp_file_limit = -1;
int num_temp_buffers = 1024;
+const char *cluster_name = "";
char *data_directory;
char *ConfigFileName;
char *HbaFileName;
@@ -3091,6 +3092,17 @@ static struct config_string ConfigureNamesString[] =
},
{
+ {"cluster_name", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
+ gettext_noop("Sets the name of the cluster that appears in 'ps' output."),
+ NULL,
+ GUC_IS_NAME
+ },
+ &cluster_name,
+ "",
+ NULL, NULL, NULL
+ },
+
+ {
{"data_directory", PGC_POSTMASTER, FILE_LOCATIONS,
gettext_noop("Sets the server's data directory."),
NULL,
diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample
index 70e5a51..8ad292a 100644
--- a/src/backend/utils/misc/postgresql.conf.sample
+++ b/src/backend/utils/misc/postgresql.conf.sample
@@ -74,6 +74,8 @@
# (change requires restart)
#bonjour_name = '' # defaults to the computer name
# (change requires restart)
+#cluster_name = '' # defaults to the computer name
+ # (change requires restart)
# - Security and Authentication -
@@ -410,6 +412,7 @@
#log_error_verbosity = default # terse, default, or verbose messages
#log_hostname = off
#log_line_prefix = '' # special values:
+ # %C = cluster name
# %a = application name
# %u = user name
# %d = database name
diff --git a/src/backend/utils/misc/ps_status.c b/src/backend/utils/misc/ps_status.c
index 6294ca3..80a3fef 100644
--- a/src/backend/utils/misc/ps_status.c
+++ b/src/backend/utils/misc/ps_status.c
@@ -29,6 +29,7 @@
#include "libpq/libpq.h"
#include "miscadmin.h"
#include "utils/ps_status.h"
+#include "utils/guc.h"
extern char **environ;
bool update_process_title = true;
@@ -264,15 +265,24 @@ init_ps_display(const char *username, const char *dbname,
* apparently setproctitle() already adds a `progname:' prefix to the ps
* line
*/
- snprintf(ps_buffer, ps_buffer_size,
- "%s %s %s ",
- username, dbname, host_info);
+#define PROGRAM_NAME_PREFIX ""
#else
- snprintf(ps_buffer, ps_buffer_size,
- "postgres: %s %s %s ",
- username, dbname, host_info);
+#define PROGRAM_NAME_PREFIX "postgres: "
#endif
+ if (*cluster_name == '\0')
+ {
+ snprintf(ps_buffer, ps_buffer_size,
+ PROGRAM_NAME_PREFIX "%s %s %s ",
+ username, dbname, host_info);
+ }
+ else
+ {
+ snprintf(ps_buffer, ps_buffer_size,
+ PROGRAM_NAME_PREFIX "%s %s %s %s ",
+ cluster_name, username, dbname, host_info);
+ }
+
ps_buffer_cur_len = ps_buffer_fixed_size = strlen(ps_buffer);
set_ps_display(initial_str, true);
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index be68f35..4dd2c58 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -223,6 +223,7 @@ extern int temp_file_limit;
extern int num_temp_buffers;
+extern const char *cluster_name;
extern char *data_directory;
extern char *ConfigFileName;
extern char *HbaFileName;
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 4a33f87..104f0bc 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -681,6 +681,23 @@ include 'filename'
</listitem>
</varlistentry>
+ <varlistentry id="guc-cluster-name" xreflabel="cluster_name">
+ <term><varname>cluster_name</varname> (<type>string</type>)</term>
+ <indexterm>
+ <primary><varname>cluster_name</> configuration parameter</primary>
+ </indexterm>
+ <listitem>
+ <para>
+ Sets the cluster name that appears in the process title for all
+ processes in this cluster. No name is shown if this parameter is set
+ to the empty string <literal>''</> (which is the default). The
+ process title is typically viewed by the <command>ps</> command, or in
+ Windows by using the <application>Process Explorer</>.
+ This parameter can only be set at server start.
+ </para>
+ </listitem>
+ </varlistentry>
+
<varlistentry id="guc-tcp-keepalives-idle" xreflabel="tcp_keepalives_idle">
<term><varname>tcp_keepalives_idle</varname> (<type>integer</type>)</term>
<indexterm>
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 15020c4..71897b8 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -449,6 +449,7 @@ int temp_file_limit = -1;
int num_temp_buffers = 1024;
+const char *cluster_name = "";
char *data_directory;
char *ConfigFileName;
char *HbaFileName;
@@ -3091,6 +3092,17 @@ static struct config_string ConfigureNamesString[] =
},
{
+ {"cluster_name", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
+ gettext_noop("Sets the name of the cluster that appears in 'ps' output."),
+ NULL,
+ GUC_IS_NAME
+ },
+ &cluster_name,
+ "",
+ NULL, NULL, NULL
+ },
+
+ {
{"data_directory", PGC_POSTMASTER, FILE_LOCATIONS,
gettext_noop("Sets the server's data directory."),
NULL,
diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample
index 70e5a51..84ae5f3 100644
--- a/src/backend/utils/misc/postgresql.conf.sample
+++ b/src/backend/utils/misc/postgresql.conf.sample
@@ -74,6 +74,8 @@
# (change requires restart)
#bonjour_name = '' # defaults to the computer name
# (change requires restart)
+#cluster_name = '' # defaults to the computer name
+ # (change requires restart)
# - Security and Authentication -
diff --git a/src/backend/utils/misc/ps_status.c b/src/backend/utils/misc/ps_status.c
index 6294ca3..80a3fef 100644
--- a/src/backend/utils/misc/ps_status.c
+++ b/src/backend/utils/misc/ps_status.c
@@ -29,6 +29,7 @@
#include "libpq/libpq.h"
#include "miscadmin.h"
#include "utils/ps_status.h"
+#include "utils/guc.h"
extern char **environ;
bool update_process_title = true;
@@ -264,15 +265,24 @@ init_ps_display(const char *username, const char *dbname,
* apparently setproctitle() already adds a `progname:' prefix to the ps
* line
*/
- snprintf(ps_buffer, ps_buffer_size,
- "%s %s %s ",
- username, dbname, host_info);
+#define PROGRAM_NAME_PREFIX ""
#else
- snprintf(ps_buffer, ps_buffer_size,
- "postgres: %s %s %s ",
- username, dbname, host_info);
+#define PROGRAM_NAME_PREFIX "postgres: "
#endif
+ if (*cluster_name == '\0')
+ {
+ snprintf(ps_buffer, ps_buffer_size,
+ PROGRAM_NAME_PREFIX "%s %s %s ",
+ username, dbname, host_info);
+ }
+ else
+ {
+ snprintf(ps_buffer, ps_buffer_size,
+ PROGRAM_NAME_PREFIX "%s %s %s %s ",
+ cluster_name, username, dbname, host_info);
+ }
+
ps_buffer_cur_len = ps_buffer_fixed_size = strlen(ps_buffer);
set_ps_display(initial_str, true);
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index be68f35..4dd2c58 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -223,6 +223,7 @@ extern int temp_file_limit;
extern int num_temp_buffers;
+extern const char *cluster_name;
extern char *data_directory;
extern char *ConfigFileName;
extern char *HbaFileName;
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