Mysql Fabric高可用集群分片功能测试

发表于:2015-2-09 10:48

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 作者:kw107301    来源:51Testing软件测试网采编

  分片后,group_id-1组插入的数据行数如下:
  mysql -P 3306 -h 192.168.1.70 -u root -e "select count(*) from test.subscribers"
  返回结果:
  +----------+
  | count(*) |
  +----------+
  | 794287 |
  +----------+
  分片后,group_id-2组插入的数据行数如下:
  mysql -P 3309 -h 192.168.1.76 -u root -e "select count(*) from test.subscribers"
  返回结果:
  +----------+
  | count(*) |
  +----------+
  | 315752 |
  +----------+
  添加一个新HA组(group_id-3),对HA组(group_id-1)进行分片,操作如下:
  a)    在机器:192.168.1.71 192.168.1.76 192.168.1.230上各起一个数据库实例,添加为组group_id-3
  mysqlfabric group add group_id-3 192.168.1.71:3313
  mysqlfabric group add group_id-3 192.168.1.76:3315
  mysqlfabric group add group_id-3 192.168.1.230:3317
  选举primary角色
  mysqlfabric group promote group_id-3
  b)    重置HA组group_id-3所有的数据库实例
  mysql -P 3313 -h 192.168.1.71 -u root -e "reset master"
  mysql -P 3315 -h 192.168.1.76 -u root -e "reset master"
  mysql -P 3317 -h 192.168.1.230 -u root -e "reset master"
  c)    查看HA组(group_id-1)的shard_id值,在储存机查看fabric数据库
  mysql -h 127.0.0.1 -P3306 -u root -e 'select * from fabric.shards'
  返回结果:
  +----------+------------+---------+
  | shard_id | group_id | state |
  +----------+------------+---------+
  | 4 | group_id-1 | ENABLED |
  | 5 | group_id-2 | ENABLED |
  +----------+------------+---------+
  d)    对HA组(group_id-1)进行分片分离,将
  mysqlfabric sharding split_shard 4 group_id-3
  ps:如果这里执行分片不成功,错误如下:
  Last_IO_Error: Got fatal error 1236 from master when reading data from binary log: 'could not find next log; the first event '' at 4, the last event read from './binlog.000003' at 621, the last byte read from './binlog.000003' at 621.'
  解决方法:
  将master角色的数据dump出来,如下:
  mysqldump -h 192.168.1.76 -u root -P3315 --all-databases --flush-privileges --single-transaction --flush-logs --triggers --routines --events --hex-blob >/data/database/full_backup_master.sql
  停掉slave机
  mysql -P 3317 -h 192.168.1.230 -u root -e "stop slave"
  mysql -P 3317 -h 192.168.1.230 -u root -e "reset master"
  mysql -P 3317 -h 192.168.1.230 -u root </data/full_backup_master.sql
  mysql -P 3317 -h 192.168.1.230 -u root -e "start slave"
  再次执行分片,会报以下错误:
  Procedure :
  { uuid = 4da230c2-31c3-4242-bd88-ccafd51bfac1,
  finished = True,
  success = False,
  return = BackupError: ('Error while restoring the backup using the mysql client\n, %s', "ERROR 1840 (HY000) at line 24 in file: 'MySQL_192.168.1.76_3306.sql': @@GLOBAL.GTID_PURGED can only be set when @@GLOBAL.GTID_EXECUTED is empty.\n"),
  activities =
  }
  解决方法:
  在HA组(group_id-3)的全部数据库实例上执行“reset master”,再分片即可
  e)    现在HA组有group_id-1、group_id-2、group_id-3,尝试插入100条记录
  group_id-1的插入的数据行数有:
  mysql -P 3306 -h 192.168.1.70 -u root -e "select count(*) from test.subscribers where sub_no between 20000 and 20100"
  返回结果:
  +----------+
  | count(*) |
  +----------+
  | 70 |
  +----------+
  group_id-2、group_id-3的插入的数据行数有:
  mysql -P 3309 -h 192.168.1.76 -u root -e "select count(*) from test.subscribers where sub_no between 20000 and 20100"
  mysql -P 3313 -h 192.168.1.230 -u root -e "select count(*) from test.subscribers where sub_no between 20000 and 20100"
  返回结果:
  +----------+
  | count(*) |
  +----------+
  | 30 |
  +----------+
  用select语句可知,HA组group_id-2、group_id-3插入的数据是一样的
  3.hash分片测试结论
  在插入1万条记录时,HA组(group_id-1)插入了7138条记录,HA组(group_id-2)插入了2903条记录
  在插入10万条记录时,HA组(group_id-1)插入了78719条记录,HA组(group_id-2)插入了31321条记录
  在插入100万条记录时,HA组(group_id-1)插入了794287条记录,HA组(group_id-2)插入了315752条记录
  因此,对mysql fabric高集群进行hash分片后,分片比例为7:3,负载并不是十分均衡
  三、调查PHP、Erlang等语言如何连接MySQL Fabric
  目前Fabric提供了Php, Java, Python三大类的API,大家可以通过编程的方式来操作Fabric。
  python脚本如上面所示
  Connector/Python:http://dev.mysql.com/doc/mysql-utilities/1.5/en/connector-python-fabric.html
  Connector/J:http://dev.mysql.com/doc/mysql-utilities/1.5/en/connector-j-fabric.html
  Connector:http://php.net/manual/zh/book.mysqlnd-ms.php
  四、mysqlfabric简单性能测试
  1、重新初始化环境,对数据重新分片,如上
  2、测试mysqlfabric的ips
43/4<1234>
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