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StoneDB读写分离实践方案

2022-10-10 分类：野生技术 阅读(148) 评论(0)

在 StoneDB 1.0 版本中，InnoDB 引擎处理 OLTP 的事务型业务，Tianmu 引擎处理 OLAP 的分析型业务。因此，需要在主从复制环境的基础上做读写分离，所有的写操作和部分读操作走 InnoDB 引擎，所有的分析类查询走 Tianmu 引擎。读写分离方案既可以使用第三方中间件，也可以在业务前端实现。本文介绍的是较为常用的中间件 ProxySQL。

服务器配置说明

IP Memory CPU OS version
192.168.30.40 8G 8C CentOS Linux release 7.9
192.168.30.41 8G 8C CentOS Linux release 7.9
192.168.30.42 8G 8C CentOS Linux release 7.9
192.168.30.46 16G 16C CentOS Linux release 7.9

注：主从环境中的各个服务器的配置一般情况下建议是一致的，但由于 StoneDB 不管重放 binlog，还是用于 OLAP 场景的查询，都是较消耗系统资源的，建议 StoneDB 配置略高于 MySQL。

主从环境说明

IP DATABASE ROLE DB version
192.168.30.40 MySQL master MySQL 5.7
192.168.30.41 / ProxySQL /
192.168.30.42 MySQL slave MySQL 5.7
192.168.30.46 StoneDB slave StoneDB 5.7

注：MySQL 与 StoneDB 的版本建议保持一致。

架构图说明
file
推荐采用一主两从的架构，上层的 ProxySQL 用于读写分离：

1）master（192.168.30.40）使用 InnoDB 引擎，可读写，提供 OLTP 场景的读写业务；
2）slave1（192.168.30.42）使用 InnoDB 引擎，只读，同时作为 standby，当 master 发生宕机时，可切换至 slave1，保证业务正常运行；
3）slave2（192.168.30.46）使用 Tianmu 引擎，只读，提供 OLAP 场景的读业务。

1、操作系统环境检查

操作系统环境检查的步骤在四个节点均需要执行。

1.1 关闭防火墙

# systemctl stop firewalld 
# systemctl disable firewalld

1.2 关闭SELINUX

# vim /etc/selinux/config
SELINUX = disabled

1.3 设置Swap分区

修改vm.swappiness的值为1，表示尽量不使用Swap。

# vi /etc/sysctl.conf
vm.swappiness = 1

1.4 修改操作系统的限制

# ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 1031433
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 65535
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 10240
cpu time               (seconds, -t) unlimited
max user processes              (-u) 1024
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

修改操作系统的软硬限制
# vim /etc/security/limits.conf
* soft nofile 65535
* hard nofile 65535
mysql soft nproc 1028056
mysql hard nproc 1028056

1.5 创建用户

# groupadd mysql
# useradd -g mysql mysql
# passwd mysql

ProxySQL 节点无需创建，以上步骤执行完之后，重启操作系统。

2、部署MySQL

在 master 节点和 slave1 节点安装 MySQL。

2.1 下载安装包

https://downloads.mysql.com/archives/community/
从官网下载 MySQL 5.7 的安装包。

2.2 卸载mariadb

# rpm -qa|grep mariadb
mariadb-5.5.56-2.el7.x86_64
mariadb-server-5.5.56-2.el7.x86_64
mariadb-libs-5.5.56-2.el7.x86_64
# yum remove mariadb*
# rpm -qa|grep mariadb

2.3 上传tar包并解压

# tar -zxvf mysql-5.7.36-linux-glibc2.12-x86_64.tar.gz -C /usr/local/
# cd /usr/local/
# mv mysql-5.7.36-linux-glibc2.12-x86_64 mysql

2.4 创建目录

# mkdir -p /mysql/data/
# mkdir -p /mysql/log
# chown -R mysql:mysql /mysql/

2.5 配置参数文件 my.cnf

master

# vim /etc/my.cnf
[client]
port    = 3306
socket  = /mysql/data/mysql.sock

[mysqld]
port      = 3306
basedir   = /usr/local/mysql
datadir   = /mysql/data
socket    = /mysql/data/mysql.sock
pid_file  = /mysql/data/mysqld.pid
log_error = /mysql/log/mysqld.log
log_bin   = /mysql/log/mybinlog
server_id = 40
character_set_server = utf8mb4
collation_server = utf8mb4_general_ci
max_connections = 1000
binlog_format = row
default_storage_engine = innodb
read_only=0

innodb_buffer_pool_size = 4096000000
innodb_log_file_size = 1024000000
innodb_log_files_in_group = 3
innodb_io_capacity = 4000
innodb_io_capacity_max = 8000

#开启GTID模式
gtid_mode = on
enforce_gtid_consistency = 1

#并行复制
binlog_transaction_dependency_tracking = WRITESET
transaction_write_set_extraction = XXHASH64

slave1

# vim /etc/my.cnf
[client]
port    = 3306
socket  = /mysql/data/mysql.sock

[mysqld]
port      = 3306
basedir   = /usr/local/mysql
datadir   = /mysql/data
socket    = /mysql/data/mysql.sock
pid_file  = /mysql/data/mysqld.pid
log_error = /mysql/log/mysqld.log
log_bin   = /mysql/log/mybinlog
server_id = 42
character_set_server = utf8mb4
collation_server = utf8mb4_general_ci
max_connections = 1000
binlog_format = row
default_storage_engine = innodb
read_only=1

innodb_buffer_pool_size = 4096000000
innodb_log_file_size = 1024000000
innodb_log_files_in_group = 3
innodb_io_capacity = 4000
innodb_io_capacity_max = 8000

#开启GTID模式
gtid_mode = on
enforce_gtid_consistency = 1

#并行复制
slave_parallel_type = LOGICAL_CLOCK
slave_parallel_workers = 4

2.6 初始化实例

/usr/local/mysql/bin/mysqld --defaults-file=/etc/my.cnf --initialize --user=mysql

2.7 启动实例

/usr/local/mysql/bin/mysqld_safe --defaults-file=/etc/my.cnf --user=mysql &

注：管理员用户的临时密码在 mysqld.log 中，第一次登陆后需要修改管理员用户的密码。

3、部署StoneDB

3.1 下载安装包

https://stonedb.io/zh/docs/download/
从官网下载 StoneDB 5.7 的安装包。

3.2 上传tar包并解压

# cd /
# tar -zxvf stonedb-ce-5.7-v1.0.0.el7.x86_64.tar.gz

用户可根据安装规范将安装包上传至服务器，解压出来的目录是 stonedb57，示例中的安装路径是 /stonedb57。

3.3 检查依赖文件

# cd /stonedb57/install/bin
# ldd mysqld
# ldd mysql

如果检查返回有关键字\"not found\"，说明缺少文件，需要安装对应的依赖包。例如：

libsnappy.so.1 => not found

在 Ubuntu 上使用命令 \"sudo apt search libsnappy\" 检查，说明需要安装 libsnappy-dev。在 RedHat 或者 CentOS 上使用命令 \"yum search all snappy\" 检查，说明需要安装 snappy-devel、snappy。

3.4 创建目录

mkdir -p /stonedb57/install/data
mkdir -p /stonedb57/install/binlog
mkdir -p /stonedb57/install/log
mkdir -p /stonedb57/install/tmp
mkdir -p /stonedb57/install/redolog
mkdir -p /stonedb57/install/undolog
chown -R mysql:mysql /stonedb57

3.5 配置参数文件 my.cnf

# vim /stonedb57/install/my.cnf
[client]
port    = 3306
socket  = /stonedb57/install/tmp/mysql.sock

[mysqld]
port      = 3306
basedir   = /stonedb57/install/
datadir   = /stonedb57/install/data
socket    = /stonedb57/install/tmp/mysql.sock
pid_file  = /stonedb57/install/data/mysqld.pid
log_error = /stonedb57/install/log/mysqld.log
log_bin   = /stonedb57/install/binlog/binlog
server_id = 46
character_set_server = utf8mb4
collation_server = utf8mb4_general_ci
max_connections = 1000
binlog_format = row
default_storage_engine = tianmu
read_only=1

innodb_buffer_pool_size = 2048000000
innodb_log_file_size = 1024000000
innodb_log_files_in_group = 3
innodb_io_capacity = 4000
innodb_io_capacity_max = 8000
innodb_log_group_home_dir   = /stonedb57/install/redolog/
innodb_undo_directory       = /stonedb57/install/undolog/
innodb_undo_log_truncate    = 1
innodb_undo_tablespaces     = 3
innodb_undo_logs            = 128

#开启GTID模式
gtid_mode = on
enforce_gtid_consistency = 1

#并行复制
slave_parallel_type = LOGICAL_CLOCK
slave_parallel_workers = 8

3.6 初始化实例

/stonedb57/install/bin/mysqld --defaults-file=/stonedb57/install/my.cnf --initialize --user=mysql

3.7 启动实例

/stonedb57/install/bin/mysqld_safe --defaults-file=/stonedb57/install/my.cnf --user=mysql &

注：管理员用户的临时密码在 mysqld.log 中，第一次登陆后需要修改管理员用户的密码。

4、配置主从

4.1 创建复制用户

create user \'repl\'@\'%\' identified by \'mysql123\';
grant replication slave on *.* to \'repl\'@\'%\';

4.2 备份主库

/usr/local/mysql/bin/mysqldump -uroot -pmysql123 --single-transaction --set-gtid-purged=on -B aa > /tmp/aa.sql

4.3 传输备份文件

scp /tmp/aa.sql root@192.168.30.42:/tmp
scp /tmp/aa.sql root@192.168.30.43:/tmp

注：如果数据较大，建议使用 mydumper.

4.4 slave1节点

/usr/local/mysql/bin/mysql -uroot -pmysql123 -S /mysqldb/data/mysql.sock
source /tmp/aa.sql

注：恢复前需要确保 gtid_executed 为空。

4.5 slave2节点

在恢复前，需要修改存储引擎，注释锁表语句。

sed -i \'s/UNLOCK TABLES/-- UNLOCK TABLES/g\' /tmp/aa.sql
sed -i \'s/LOCK TABLES `/-- LOCK TABLES `/g\' /tmp/aa.sql
sed -i \'s/ENGINE=InnoDB/ENGINE=tianmu/g\' /tmp/aa.sql

/stonedb57/install/bin/mysql -uroot -pmysql123 -S /stonedb57/install/tmp/mysql.sock
source /tmp/aa.sql

注：恢复前需要确保 gtid_executed 为空。

4.6 建立主从复制

slave1节点

CHANGE MASTER TO
MASTER_HOST=\'192.168.30.40\',
MASTER_PORT=3306,
MASTER_USER=\'repl\',
MASTER_PASSWORD=\'mysql123\',
MASTER_AUTO_POSITION = 1;

start slave;
show slave status\\G

slave2节点

CHANGE MASTER TO
MASTER_HOST=\'192.168.30.40\',
MASTER_PORT=3306,
MASTER_USER=\'repl\',
MASTER_PASSWORD=\'mysql123\',
MASTER_AUTO_POSITION = 1;

start slave;
show slave status\\G

5、配置ProxySQL

5.1 安装ProxySQL

# mkdir -p /home/ProxySQL
# cd /home/ProxySQL
# yum install proxysql-2.2.0-1-centos7.x86_64.rpm
# rpm -qa|grep proxysql
# rpm -ql proxysql

注：/etc/proxysql.cnf 为 ProxySQL 的配置文件。

5.2 启动ProxySQL

# systemctl start proxysql
# netstat -lntp|grep proxysql
tcp        0      0 0.0.0.0:6032            0.0.0.0:*               LISTEN      17957/proxysql      
tcp        0      0 0.0.0.0:6033            0.0.0.0:*               LISTEN      17957/proxysql

注：6032是管理端口，6033是服务端口。

5.3 管理员登录ProxySQL

# mysql -uadmin -padmin -h127.0.0.1 -P6032 --prompt=\'ProxySQL>\'
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \\g.
Your MySQL connection id is 1
Server version: 5.5.30 (ProxySQL Admin Module)

Copyright (c) 2000, 2021, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type \'help;\' or \'\\h\' for help. Type \'\\c\' to clear the current input statement.

ProxySQL>show databases;
+-----+---------------+-------------------------------------+
| seq | name          | file                                |
+-----+---------------+-------------------------------------+
| 0   | main          |                                     |
| 2   | disk          | /var/lib/proxysql/proxysql.db       |
| 3   | stats         |                                     |
| 4   | monitor       |                                     |
| 5   | stats_history | /var/lib/proxysql/proxysql_stats.db |
+-----+---------------+-------------------------------------+
5 rows in set (0.00 sec)

注：ProxySQL 的用户名和密码默认都是 admin，加参数 prompt 是为了便于区分环境。

5.4 创建ProxySQL所需用户

在 master 上创建 ProxySQL 的监控用户和对外访问用户，其中监控用户只需要有 replication client 权限即可。

###监控用户
create user \'monitor\'@\'%\' identified by \'MySQL_123\';
grant replication client on *.* to \'monitor\'@\'%\';

###对外访问用户（用于连接ProxySQL）
create user \'proxysql\'@\'%\' identified by \'MySQL_123\';
grant select,delete,update,insert on *.* to \'proxysql\'@\'%\';

5.5 配置ProxySQL主从分组信息

1）创建分组

表 mysql_replication_hostgroups 的字段 writer_hostgroup、reader_hostgroup 分别代表写组和读组，都要大于0且不能相同，该环境中定义写组为10，读组为20。

ProxySQL 会根据 read_only 的取值将 server 进行分组，read_only=0为 master，被分到编号为10的写组，read_only=1为 slave，被分到编号为20的读组。

###创建分组
insert into mysql_replication_hostgroups(writer_hostgroup,reader_hostgroup,comment) values(10,20,\'proxy\');
load mysql servers to runtime;
save mysql servers to disk;

###查看三层配置系统是否都写入数据
ProxySQL>select * from mysql_replication_hostgroups;
+------------------+------------------+------------+---------+
| writer_hostgroup | reader_hostgroup | check_type | comment |
+------------------+------------------+------------+---------+
| 10               | 20               | read_only  | proxy   |
+------------------+------------------+------------+---------+
1 row in set (0.00 sec)

ProxySQL>select * from runtime_mysql_replication_hostgroups;
+------------------+------------------+------------+---------+
| writer_hostgroup | reader_hostgroup | check_type | comment |
+------------------+------------------+------------+---------+
| 10               | 20               | read_only  | proxy   |
+------------------+------------------+------------+---------+
1 row in set (0.00 sec)

ProxySQL>select * from mysql_replication_hostgroups;
+------------------+------------------+------------+---------+
| writer_hostgroup | reader_hostgroup | check_type | comment |
+------------------+------------------+------------+---------+
| 10               | 20               | read_only  | proxy   |
+------------------+------------------+------------+---------+
1 row in set (0.00 sec)

2）添加主从节点

insert into mysql_servers(hostgroup_id,hostname,port) values(10,\'192.168.30.40\',3306);
insert into mysql_servers(hostgroup_id,hostname,port) values(20,\'192.168.30.46\',3306);
load mysql servers to runtime;
save mysql servers to disk;

###查看状态
ProxySQL>select * from mysql_servers;
+--------------+---------------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+---------+
| hostgroup_id | hostname      | port | gtid_port | status | weight | compression | max_connections | max_replication_lag | use_ssl | max_latency_ms | comment |
+--------------+---------------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+---------+
| 20           | 192.168.30.40 | 3306 | 0         | ONLINE | 1      | 0           | 1000            | 0                   | 0       | 0              |         |
| 20           | 192.168.30.46 | 3306 | 0         | ONLINE | 1      | 0           | 1000            | 0                   | 0       | 0              |         |
+--------------+---------------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+---------+
2 rows in set (0.00 sec)

3）为ProxySQL创建监控用户

###创建监控用户（在ProxySQL创建）
set mysql-monitor_username=\'monitor\';
set mysql-monitor_password=\'MySQL_123\';
load mysql variables to runtime;
save mysql variables to disk;

###对连接用户监控
ProxySQL>select * from monitor.mysql_server_connect_log;
+---------------+------+------------------+-------------------------+------------------------------------------------------------------------+
| hostname      | port | time_start_us    | connect_success_time_us | connect_error                                                          |
+---------------+------+------------------+-------------------------+------------------------------------------------------------------------+
| 192.168.30.40 | 3306 | 1664183920198998 | 0                       | Access denied for user \'monitor\'@\'192.168.30.41\' (using password: YES) |
| 192.168.30.46 | 3306 | 1664183920926981 | 0                       | Access denied for user \'monitor\'@\'HAMI02\' (using password: YES)        |
| 192.168.30.46 | 3306 | 1664183970671663 | 1616                    | NULL                                                                   |
| 192.168.30.40 | 3306 | 1664183971672625 | 2089                    | NULL                                                                   |
+---------------+------+------------------+-------------------------+------------------------------------------------------------------------+
4 rows in set (0.00 sec)

注：在没有创建监控用户前，会有很多的connect_error，这是因为没有配置监控信息时的错误，配置后如果connect_error的结果为NULL，则表示正常。

###对心跳信息的监控
ProxySQL>select * from mysql_server_ping_log limit 10;
+---------------+------+------------------+----------------------+------------------------------------------------------------------------+
| hostname      | port | time_start_us    | ping_success_time_us | ping_error                                                             |
+---------------+------+------------------+----------------------+------------------------------------------------------------------------+
| 192.168.30.40 | 3306 | 1664183880229349 | 0                    | Access denied for user \'monitor\'@\'192.168.30.41\' (using password: YES) |
| 192.168.30.46 | 3306 | 1664183880427787 | 0                    | Access denied for user \'monitor\'@\'HAMI02\' (using password: YES)        |
| 192.168.30.40 | 3306 | 1664183890229405 | 0                    | Access denied for user \'monitor\'@\'192.168.30.41\' (using password: YES) |
| 192.168.30.46 | 3306 | 1664183890336793 | 0                    | Access denied for user \'monitor\'@\'HAMI02\' (using password: YES)        |
| 192.168.30.40 | 3306 | 1664183900229529 | 0                    | Access denied for user \'monitor\'@\'192.168.30.41\' (using password: YES) |
| 192.168.30.46 | 3306 | 1664183900357491 | 0                    | Access denied for user \'monitor\'@\'HAMI02\' (using password: YES)        |
| 192.168.30.46 | 3306 | 1664183910229710 | 0                    | Access denied for user \'monitor\'@\'HAMI02\' (using password: YES)        |
| 192.168.30.40 | 3306 | 1664183910406115 | 0                    | Access denied for user \'monitor\'@\'192.168.30.41\' (using password: YES) |
| 192.168.30.46 | 3306 | 1664183920229740 | 0                    | Access denied for user \'monitor\'@\'HAMI02\' (using password: YES)        |
| 192.168.30.40 | 3306 | 1664183920346638 | 0                    | Access denied for user \'monitor\'@\'192.168.30.41\' (using password: YES) |
+---------------+------+------------------+----------------------+------------------------------------------------------------------------+
10 rows in set (0.00 sec)

###对read_only值监控
ProxySQL>select * from mysql_server_read_only_log limit 10;
+---------------+------+------------------+-----------------+-----------+------------------------------------------------------------------------------------------------------------+
| hostname      | port | time_start_us    | success_time_us | read_only | error                                                                                                      |
+---------------+------+------------------+-----------------+-----------+------------------------------------------------------------------------------------------------------------+
| 192.168.30.46 | 3306 | 1664183876942878 | 0               | NULL      | timeout on creating new connection: Access denied for user \'monitor\'@\'HAMI02\' (using password: YES)        |
| 192.168.30.40 | 3306 | 1664183876961694 | 0               | NULL      | timeout on creating new connection: Access denied for user \'monitor\'@\'192.168.30.41\' (using password: YES) |
| 192.168.30.46 | 3306 | 1664183878441697 | 0               | NULL      | timeout on creating new connection: Access denied for user \'monitor\'@\'HAMI02\' (using password: YES)        |
| 192.168.30.40 | 3306 | 1664183878461063 | 0               | NULL      | timeout on creating new connection: Access denied for user \'monitor\'@\'192.168.30.41\' (using password: YES) |
| 192.168.30.46 | 3306 | 1664183879941587 | 0               | NULL      | timeout on creating new connection: Access denied for user \'monitor\'@\'HAMI02\' (using password: YES)        |
| 192.168.30.40 | 3306 | 1664183879961993 | 0               | NULL      | timeout on creating new connection: Access denied for user \'monitor\'@\'192.168.30.41\' (using password: YES) |
| 192.168.30.46 | 3306 | 1664183881441750 | 0               | NULL      | timeout on creating new connection: Access denied for user \'monitor\'@\'HAMI02\' (using password: YES)        |
| 192.168.30.40 | 3306 | 1664183881461890 | 0               | NULL      | timeout on creating new connection: Access denied for user \'monitor\'@\'192.168.30.41\' (using password: YES) |
| 192.168.30.40 | 3306 | 1664183882942044 | 0               | NULL      | timeout on creating new connection: Access denied for user \'monitor\'@\'192.168.30.41\' (using password: YES) |
| 192.168.30.46 | 3306 | 1664183882958866 | 0               | NULL      | timeout on creating new connection: Access denied for user \'monitor\'@\'HAMI02\' (using password: YES)        |
+---------------+------+------------------+-----------------+-----------+------------------------------------------------------------------------------------------------------------+
10 rows in set (0.00 sec)

注：monitor就会开始监控后端的read_only值，然后按照read_only的值将某些节点自动移到读写组。

4）为ProxySQL配置对外访问用户

insert into mysql_users(username,password,default_hostgroup) values(\'proxysql\',\'MySQL_123\',10);
insert into mysql_users(username,password,default_hostgroup) values(\'proxysql2\',\'*0815E74A768849A6CCF0E9C1C5B940FB4D9F839E\',20);
load mysql users to runtime;
save mysql users to disk;

ProxySQL>select * from mysql_users\\G
*************************** 1. row ***************************
              username: proxysql
              password: MySQL_123
                active: 1
               use_ssl: 0
     default_hostgroup: 10
        default_schema: NULL
         schema_locked: 0
transaction_persistent: 1
          fast_forward: 0
               backend: 1
              frontend: 1
       max_connections: 10000
            attributes: 
               comment: 
*************************** 2. row ***************************
              username: proxysql2
              password: *0815E74A768849A6CCF0E9C1C5B940FB4D9F839E
                active: 1
               use_ssl: 0
     default_hostgroup: 20
        default_schema: NULL
         schema_locked: 0
transaction_persistent: 1
          fast_forward: 0
               backend: 1
              frontend: 1
       max_connections: 10000
            attributes: 
               comment: 
2 rows in set (0.00 sec)

mysql_users 表最主要的三个字段 username、password、default_hostgroup 解释。

username：前端连接 ProxySQL 的数据库用户

password：用户对应的密码，即可以是明文密码，也可以是 hash 密码，如果想使用 hash 密码，可以先在某个节点上执行 select password(\'password\')，然后将加密结果复制到该字段。

default_hostgroup：用户默认的路由目标，例如：若用户 proxysql2 是个只读用户，则该字段值可以设置为20，表示所有的SQL语句默认情况下将路由到 hostgroup_id=20 的组；若用户不是只读用户，则该字段必须设置为10，表示 DML 语句会路由到 hostgroup_id=10 的组，查询语句即会路由到 hostgroup_id=10 的组，也会路由到 hostgroup_id=20 的组。

5.6 配置读写分离策略

ProxySQL 的路由规则配置比较灵活，可以基于用户级别，数据库级别等。由于 StoneDB 提供的是 OLAP 分析型查询业务场景，建议将聚合类查询、即席查询、复杂查询等分发到 StoneDB。由于只是测试，因此只配置了几个简单的路由规则。

与查询规则有关的表有两个：mysql_query_rules 和 mysql_query_rules_fast_routing，表mysql_query_rules_fast_routing 是 mysql_query_rules 的扩展，并在以后评估快速路由策略和属性（仅在ProxySQL 1.4.7+中可用）。

mysql_query_rules 表的几个字段解释。

active：是否启用这个规则，1表示启用，0表示禁用

match_pattern：设置规则

destination_hostgroup：默认指定的分组

apply：真正执行应用规则

###创建规则
这里我创建两个规则：
1）把所有以select开头的语句分配到编号为20的读组中；
2）把select...for update语句分配到编号为10的写组中，其他所有操作都会默认路由到写组。
insert into mysql_query_rules(rule_id,active,match_pattern,destination_hostgroup,apply) values(1,1,\'^select.*for update$\',10,1);
insert into mysql_query_rules(rule_id,active,match_pattern,destination_hostgroup,apply) values(2,1,\'^select\',20,1);
insert into mysql_query_rules(rule_id,active,match_pattern,destination_hostgroup,apply) values(3,1,\'^select*sum\',20,1);
load mysql query rules to runtime;
save mysql query rules to disk;

###查看规则
ProxySQL>select * from mysql_query_rules\\G
*************************** 1. row ***************************
              rule_id: 1
               active: 1
             username: NULL
           schemaname: NULL
               flagIN: 0
          client_addr: NULL
           proxy_addr: NULL
           proxy_port: NULL
               digest: NULL
         match_digest: NULL
        match_pattern: ^select.*for update$
 negate_match_pattern: 0
         re_modifiers: CASELESS
              flagOUT: NULL
      replace_pattern: NULL
destination_hostgroup: 10
            cache_ttl: NULL
   cache_empty_result: NULL
        cache_timeout: NULL
            reconnect: NULL
              timeout: NULL
              retries: NULL
                delay: NULL
    next_query_flagIN: NULL
       mirror_flagOUT: NULL
     mirror_hostgroup: NULL
            error_msg: NULL
               OK_msg: NULL
          sticky_conn: NULL
            multiplex: NULL
  gtid_from_hostgroup: NULL
                  log: NULL
                apply: 1
           attributes: 
              comment: NULL
*************************** 2. row ***************************
              rule_id: 2
               active: 1
             username: NULL
           schemaname: NULL
               flagIN: 0
          client_addr: NULL
           proxy_addr: NULL
           proxy_port: NULL
               digest: NULL
         match_digest: NULL
        match_pattern: ^select
 negate_match_pattern: 0
         re_modifiers: CASELESS
              flagOUT: NULL
      replace_pattern: NULL
destination_hostgroup: 20
            cache_ttl: NULL
   cache_empty_result: NULL
        cache_timeout: NULL
            reconnect: NULL
              timeout: NULL
              retries: NULL
                delay: NULL
    next_query_flagIN: NULL
       mirror_flagOUT: NULL
     mirror_hostgroup: NULL
            error_msg: NULL
               OK_msg: NULL
          sticky_conn: NULL
            multiplex: NULL
  gtid_from_hostgroup: NULL
                  log: NULL
                apply: 1
           attributes: 
              comment: NULL
*************************** 3. row ***************************
              rule_id: 3
               active: 1
             username: NULL
           schemaname: NULL
               flagIN: 0
          client_addr: NULL
           proxy_addr: NULL
           proxy_port: NULL
               digest: NULL
         match_digest: NULL
        match_pattern: ^select*sum
 negate_match_pattern: 0
         re_modifiers: CASELESS
              flagOUT: NULL
      replace_pattern: NULL
destination_hostgroup: 20
            cache_ttl: NULL
   cache_empty_result: NULL
        cache_timeout: NULL
            reconnect: NULL
              timeout: NULL
              retries: NULL
                delay: NULL
    next_query_flagIN: NULL
       mirror_flagOUT: NULL
     mirror_hostgroup: NULL
            error_msg: NULL
               OK_msg: NULL
          sticky_conn: NULL
            multiplex: NULL
  gtid_from_hostgroup: NULL
                  log: NULL
                apply: 1
           attributes: 
              comment: NULL
3 rows in set (0.00 sec)

注：select...for update 规则的 rule_id 必须要小于普通的 select 规则的 rule_id，因为 ProxySQL 是根据 rule_id的顺序进行规则匹配的。

5.7 读写分离测试

1）读操作

# mysql -uproxysql -pMySQL_123 -h127.0.0.1 -P6033
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \\g.
Your MySQL connection id is 6
Server version: 5.5.30 (ProxySQL)

Copyright (c) 2000, 2021, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type \'help;\' or \'\\h\' for help. Type \'\\c\' to clear the current input statement.

proxysql@HAMI02 17:21:  [(none)]> select sum(money) from aa.ttt;
+------------+
| sum(money) |
+------------+
|    88888.8 |
+------------+
1 row in set (0.01 sec)

proxysql@HAMI02 17:21:  [(none)]> select @@server_id;
+-------------+
| @@server_id |
+-------------+
|          46 |
+-------------+
1 row in set (0.00 sec)

2）写操作

# mysql -uproxysql -pMySQL_123 -h127.0.0.1 -P6033
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \\g.
Your MySQL connection id is 19
Server version: 5.5.30 (ProxySQL)

Copyright (c) 2000, 2021, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type \'help;\' or \'\\h\' for help. Type \'\\c\' to clear the current input statement.

proxysql@HAMI02 19:53:  [(none)]> begin;
Query OK, 0 rows affected (0.00 sec)

proxysql@HAMI02 19:54:  [(none)]> insert into aa.t1 values(7);
Query OK, 1 row affected (0.00 sec)

proxysql@HAMI02 19:54:  [(none)]> select @@server_id;
+-------------+
| @@server_id |
+-------------+
|          40 |
+-------------+
1 row in set (0.00 sec)

6、建议项

1）建议设置为 GTID 模式，好处是从库发生 crash 后，不需要去找位点，系统会自动拉起复制线程；

2）在从库的并行 worker 相同的情况下，从库 StoneDB 相比从库 InnoDB 会消耗更多的CPU资源，如果未来上生产环境，建议 StoneDB 的配置略比 InnoDB 的配置高；

3）若从库 StoneDB 的延迟较高，可临时关闭参数 tianmu_enable_rowstore，待追上主库后再开启参数。关闭该参数带来的风险是如果在同步过程中 StoneDB 发生重启，重启后会出现丢数据的情况；

4）建议将聚合类查询、即席查询、复杂查询等分发到 StoneDB。

来源：https://www.cnblogs.com/yangwilly/p/16776449.html
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未经允许不得转载：百木园 » StoneDB读写分离实践方案
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