MariaDB Galera server currently dumps many node's status and cluster membership related information to the server logs. The idea behind this task is to make those information available to the user through INFORMATION_SCHEMA. Following is the sample output :
MariaDB [test]> INSTALL PLUGIN wsrep_status SONAME 'wsrep_status.so';
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Query OK, 0 rows affected (0.03 sec)
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MariaDB [test]> INSTALL PLUGIN wsrep_membership SONAME 'wsrep_status.so';
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Query OK, 0 rows affected (0.16 sec)
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MariaDB [test]> SELECT * FROM INFORMATION_SCHEMA.WSREP_STATUS;
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+------------+-------------+----------------+--------------+--------------------------------------+---------------------+-----------------+-----+------------------+
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| NODE_INDEX | NODE_STATUS | CLUSTER_STATUS | CLUSTER_SIZE | CLUSTER_STATE_UUID | CLUSTER_STATE_SEQNO | CLUSTER_CONF_ID | GAP | PROTOCOL_VERSION |
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+------------+-------------+----------------+--------------+--------------------------------------+---------------------+-----------------+-----+------------------+
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| 0 | Synced | Primary | 3 | 00b0fbad-6e84-11e4-8a8b-376f19ce8ee7 | 2 | 3 | NO | 3 |
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+------------+-------------+----------------+--------------+--------------------------------------+---------------------+-----------------+-----+------------------+
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1 row in set (0.00 sec)
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MariaDB [test]> SELECT * FROM INFORMATION_SCHEMA.WSREP_MEMBERSHIP;
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+-------+--------------------------------------+-------+-----------------+
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| INDEX | UUID | NAME | ADDRESS |
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+-------+--------------------------------------+-------+-----------------+
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| 0 | 46da96e3-6e9e-11e4-95a2-f609aa5444b3 | node1 | 10.0.2.15:16000 |
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| 1 | 5f6bc72a-6e9e-11e4-84ed-57ec6780a3d3 | node2 | 10.0.2.15:16001 |
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| 2 | 7473fd75-6e9e-11e4-91de-0b541ad91bd0 | node3 | 10.0.2.15:16002 |
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+-------+--------------------------------------+-------+-----------------+
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3 rows in set (0.00 sec)
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Task
Major
