PXC 部署前置检查

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1.Galera Cluster部署的前置检查

在要转成Galera Cluster的数据库上执行如下SQL语句:

SELECT DISTINCT
       CONCAT(t.table_schema,'.',t.table_name) as tbl,
       t.engine,
       IF(ISNULL(c.constraint_name),'NOPK','') AS nopk,
       IF(s.index_type = 'FULLTEXT','FULLTEXT','') as ftidx,
       IF(s.index_type = 'SPATIAL','SPATIAL','') as gisidx
  FROM information_schema.tables AS t
  LEFT JOIN information_schema.key_column_usage AS c
    ON (t.table_schema = c.constraint_schema AND t.table_name = c.table_name
        AND c.constraint_name = 'PRIMARY')
  LEFT JOIN information_schema.statistics AS s
    ON (t.table_schema = s.table_schema AND t.table_name = s.table_name
        AND s.index_type IN ('FULLTEXT','SPATIAL'))
  WHERE t.table_schema NOT IN ('information_schema','performance_schema','mysql')
    AND t.table_type = 'BASE TABLE'
    AND (t.engine <> 'InnoDB' OR c.constraint_name IS NULL OR s.index_type IN ('FULLTEXT','SPATIAL'))
  ORDER BY t.table_schema,t.table_name;

上述SQL检索数据库，输出不符合使用Galera的表的信息，对应的5个字段顺序为：表，表引擎，是否无主键，是否有全文索引，是否有空间索引。

找到不符合的原因，对应修改即可。

2.MySQL Galera监控

查看MySQL版本: mysql> SHOW GLOBAL VARIABLES LIKE 'version';

查看wsrep版本: mysql> SHOW GLOBAL STATUS LIKE 'wsrep_provider_version';

查看wsrep有关的所有变量: mysql> SHOW VARIABLES LIKE 'wsrep%' \G

查看Galera集群状态: mysql> show status like 'wsrep%';

监控状态参数说明:

集群完整性检查:

wsrep_cluster_state_uuid:在集群所有节点的值应该是相同的,有不同值的节点,说明其没有连接入集群.

wsrep_cluster_conf_id:正常情况下所有节点上该值是一样的.如果值不同,说明该节点被临时"分区"了.当节点之间网络连接恢复的时候应该会恢复一样的值.

wsrep_cluster_size:如果这个值跟预期的节点数一致,则所有的集群节点已经连接.

wsrep_cluster_status:集群组成的状态.如果不为"Primary",说明出现"分区"或是"split-brain"状况.

节点状态检查:

wsrep_ready: 该值为ON,则说明可以接受SQL负载.如果为Off,则需要检查wsrep_connected.

wsrep_connected: 如果该值为Off,且wsrep_ready的值也为Off,则说明该节点没有连接到集群.(可能是wsrep_cluster_address或wsrep_cluster_name等配置错造成的.具体错误需要查看错误日志)

wsrep_local_state_comment:如果wsrep_connected为On,但wsrep_ready为OFF,则可以从该项查看原因.

复制健康检查:

wsrep_flow_control_paused:表示复制停止了多长时间.即表明集群因为Slave延迟而慢的程度.值为0~1,越靠近0越好,值为1表示复制完全停止.可优化wsrep_slave_threads的值来改善.

wsrep_cert_deps_distance:有多少事务可以并行应用处理.wsrep_slave_threads设置的值不应该高出该值太多.

wsrep_flow_control_sent:表示该节点已经停止复制了多少次.

wsrep_local_recv_queue_avg:表示slave事务队列的平均长度.slave瓶颈的预兆.

最慢的节点的wsrep_flow_control_sent和wsrep_local_recv_queue_avg这两个值最高.这两个值较低的话,相对更好.

检测慢网络问题:

wsrep_local_send_queue_avg:网络瓶颈的预兆.如果这个值比较高的话,可能存在网络瓶

冲突或死锁的数目:

wsrep_last_committed:最后提交的事务数目

wsrep_local_cert_failures和wsrep_local_bf_aborts:回滚,检测到的冲突数目

参考文档:

MariaDB和Galera Cluster相关文档
http://blog.secaserver.com/2011/07/install-mysql-replication-and-cluster-using-galera/
http://weetinyworld.blogspot.tw/2013/04/setting-up-mariadb-galera-cluster-from.html
http://blog.wu-boy.com/2013/03/galera-cluster-for-mysql-multi-master-replication/
http://www.sebastien-han.fr/blog/2012/08/29/setup-galera-with-sst-xtrabackup-method/
http://blog.secaserver.com/2011/07/install-mysql-replication-and-cluster-using-galera/
http://blog.secaserver.com/2012/02/high-availability-mysql-cluster-galera-haproxy/
http://www.severalnines.com/resources/clustercontrol-mysql-haproxy-load-balancing-tutorial
http://opentodo.net/2012/12/mysql-multi-master-replication-with-galera/
http://www.planetlarg.net/open-source-cookbook/data-storage/replace-mysql-mysql-galera
http://www.sebastien-han.fr/blog/2012/04/08/mysql-galera-cluster-with-haproxy/
http://www.zrwm.com/?cat=130
http://openquery.com/blog/galera-predeployment-check
http://www.percona.com/files/presentations/percona-live/nyc-2012/PLNY12-galera-cluster-best-practices.pdf
https://groups.google.com/forum/#!msg/codership-team/OUxATjcznPI/H8ftsjZwptAJ
http://www.zrwm.com/?p=5844
http://beerpla.net/2008/09/05/mysql-slave-lag-delay-explained-and-7-ways-to-battle-it/
http://wiki.vps.net/vps-net-features/cloud-servers/template-information/galeramysql-recommended-cluster-configuration/
http://haproxy.1wt.eu/download/1.4/doc/configuration.txt

GTID和mysqlfailover相关文档
http://scriptingmysql.wordpress.com/2012/12/06/using-the-mysql-script-mysqlfailover-for-automatic-failover-with-mysql-5-6-gtid-replication/
http://svenmysql.blogspot.se/2012/10/failover-and-flexible-replication.html
http://svenmysql.blogspot.tw/2012/10/advanced-use-of-global-transaction.html
http://svenmysql.blogspot.se/2013/03/flexible-fail-over-policies-using-mysql.html
http://www.percona.com/sites/default/files/presentations/MHA_Toronto_Presentation.pdf
http://hickey.in/?p=78
http://dev.mysql.com/doc/refman/5.6/en/replication-gtids-howto.html
http://huoding.com/2011/04/05/59
http://www.cnblogs.com/hustcat/archive/2009/12/19/1627525.html
http://dev.mysql.com/doc/refman/5.5/en/replication-howto-masterstatus.html

转自http://www.360doc.com/content/13/0817/15/834950_307820923.shtml部分

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