From: Rachid Zarouali <rachid.zarouali@synolia.com>
Date: Thu, 4 Aug 2016 07:10:13 +0000 (+0200)
Subject: mysql plugin: add support for Galera statistics
X-Git-Tag: collectd-5.6.0~108^2
X-Git-Url: https://git.verplant.org/?a=commitdiff_plain;h=2633870ff70e8930c3e637970e775a6265ab26f0;p=collectd.git

mysql plugin: add support for Galera statistics
---

diff --git a/.gitignore b/.gitignore
index d7423895..b85dc48a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -81,6 +81,9 @@ bindings/java/org/collectd/java/*.class
 # lint stuff
 *.ln
 
+#ide stuff
+.vscode
+
 # Unit tests
 src/daemon/test-suite.log
 src/tests/
diff --git a/src/collectd.conf.in b/src/collectd.conf.in
index b678c425..1e8994ee 100644
--- a/src/collectd.conf.in
+++ b/src/collectd.conf.in
@@ -741,6 +741,12 @@
 #		SlaveStats true
 #		SlaveNotifications true
 #	</Database>
+#	<Database galera>
+#		Alias "galera"
+#		Host "localhost"
+#		Socket "/var/run/mysql/mysqld.sock"
+#		WsrepStats true
+#	</Database>
 #</Plugin>
 
 #<Plugin netapp>
diff --git a/src/collectd.conf.pod b/src/collectd.conf.pod
index ac06547f..3e11e063 100644
--- a/src/collectd.conf.pod
+++ b/src/collectd.conf.pod
@@ -3661,6 +3661,13 @@ Synopsis:
       SlaveStats true
       SlaveNotifications true
     </Database>
+
+   <Database galera>
+      Alias "galera"
+      Host "localhost"
+      Socket "/var/run/mysql/mysqld.sock"
+      WsrepStats true
+   </Database>
   </Plugin>
 
 A B<Database> block defines one connection to a MySQL database. It accepts a
@@ -3731,6 +3738,12 @@ privileges. See the B<User> documentation above. Defaults to B<false>.
 If enabled, the plugin sends a notification if the replication slave I/O and /
 or SQL threads are not running. Defaults to B<false>.
 
+=item B<WsrepStats> I<true|false>
+ 
+ Enable the collection of wsrep plugin statistics, used in Master-Master
+ replication setups like in MySQL Galera/Percona XtraDB Cluster.
+ User needs only privileges to execute 'SHOW GLOBAL STATUS'
+ 
 =item B<ConnectTimeout> I<Seconds>
 
 Sets the connect timeout for the MySQL client.
diff --git a/src/mysql.c b/src/mysql.c
index 54236dac..20c9004c 100644
--- a/src/mysql.c
+++ b/src/mysql.c
@@ -54,6 +54,7 @@ struct mysql_database_s /* {{{ */
 	_Bool master_stats;
 	_Bool slave_stats;
 	_Bool innodb_stats;
+	_Bool wsrep_stats;
 
 	_Bool slave_notif;
 	_Bool slave_io_running;
@@ -179,6 +180,8 @@ static int mysql_config_database (oconfig_item_t *ci) /* {{{ */
 			status = cf_util_get_boolean (child, &db->slave_notif);
 		else if (strcasecmp ("InnodbStats", child->key) == 0)
 			status = cf_util_get_boolean (child, &db->innodb_stats);
+		else if (strcasecmp ("WsrepStats", child->key) == 0)
+			status = cf_util_get_boolean (child, &db->wsrep_stats);
 		else
 		{
 			WARNING ("mysql plugin: Option `%s' not allowed here.", child->key);
@@ -685,6 +688,93 @@ static int mysql_read_innodb_stats (mysql_database_t *db, MYSQL *con)
 	return (0);
 }
 
+static int mysql_read_wsrep_stats (mysql_database_t *db, MYSQL *con)
+{
+	MYSQL_RES *res;
+	MYSQL_ROW  row;
+
+	const char *query;
+	struct {
+		const char *key;
+		const char *type;
+		int ds_type;
+	} metrics[] = {
+
+		{ "wsrep_apply_oooe",                "operations",   DS_TYPE_DERIVE },
+		{ "wsrep_apply_oool",                "operations",   DS_TYPE_DERIVE },
+		{ "wsrep_causal_reads",              "operations",   DS_TYPE_DERIVE },
+		{ "wsrep_commit_oooe",               "operations",   DS_TYPE_DERIVE },
+		{ "wsrep_commit_oool",               "operations",   DS_TYPE_DERIVE },
+		{ "wsrep_flow_control_recv",         "operations",   DS_TYPE_DERIVE },
+		{ "wsrep_flow_control_sent",         "operations",   DS_TYPE_DERIVE },
+		{ "wsrep_flow_control_paused",       "operations",   DS_TYPE_DERIVE },
+		{ "wsrep_local_bf_aborts",           "operations",   DS_TYPE_DERIVE },
+		{ "wsrep_local_cert_failures",       "operations",   DS_TYPE_DERIVE },
+		{ "wsrep_local_commits",             "operations",   DS_TYPE_DERIVE },
+		{ "wsrep_local_replays",             "operations",   DS_TYPE_DERIVE },
+		{ "wsrep_received",                  "operations",   DS_TYPE_DERIVE },
+		{ "wsrep_replicated",                "operations",   DS_TYPE_DERIVE },
+
+		{ "wsrep_received_bytes",            "total_bytes",  DS_TYPE_DERIVE },
+		{ "wsrep_replicated_bytes",          "total_bytes",  DS_TYPE_DERIVE },
+
+		{ "wsrep_apply_window",              "gauge",        DS_TYPE_GAUGE },
+		{ "wsrep_commit_window",             "gauge",        DS_TYPE_GAUGE },
+
+		{ "wsrep_cluster_size",              "gauge",        DS_TYPE_GAUGE },
+		{ "wsrep_cert_deps_distance",        "gauge",        DS_TYPE_GAUGE },
+
+		{ "wsrep_local_recv_queue",          "queue_length", DS_TYPE_GAUGE },
+		{ "wsrep_local_send_queue",          "queue_length", DS_TYPE_GAUGE },
+
+		{ NULL,                              NULL,           0}
+
+	};
+
+	query = "SHOW GLOBAL STATUS LIKE 'wsrep_%'";
+
+	res = exec_query (con, query);
+	if (res == NULL)
+		return (-1);
+
+	row = mysql_fetch_row (res);
+	if (row == NULL)
+	{
+		ERROR ("mysql plugin: Failed to get wsrep statistics: "
+			"`%s' did not return any rows.", query);
+		mysql_free_result (res);
+		return (-1);
+	}
+
+	while ((row = mysql_fetch_row (res)))
+	{
+		int i;
+		char *key;
+		unsigned long long val;
+
+		key = row[0];
+		val = atoll (row[1]);
+
+		for (i = 0; metrics[i].key != NULL && strcmp(metrics[i].key, key) != 0; i++)
+			;
+
+		if (metrics[i].key == NULL)
+			continue;
+
+		switch (metrics[i].ds_type) {
+			case DS_TYPE_GAUGE:
+				gauge_submit(metrics[i].type, key, (gauge_t)val, db);
+				break;
+			case DS_TYPE_DERIVE:
+				derive_submit(metrics[i].type, key, (derive_t)val, db);
+				break;
+		}
+	}
+
+	mysql_free_result(res);
+	return (0);
+} /* mysql_read_wsrep_stats */
+
 static int mysql_read (user_data_t *ud)
 {
 	mysql_database_t *db;
@@ -953,6 +1043,9 @@ static int mysql_read (user_data_t *ud)
 	if ((db->slave_stats) || (db->slave_notif))
 		mysql_read_slave_stats (db, con);
 
+	if (db->wsrep_stats)
+		mysql_read_wsrep_stats (db, con);
+
 	return (0);
 } /* int mysql_read */