将读/写拆分与PHP mysqlnd_ms一起使用的问题

我正在尝试设置PHP mysqlnd_ms扩展,我遇到了一些问题.到目前为止,我所做的就是：

–compiled PHP from source while enabling mysqlnd

– 安装mysqlnd_ms(如果我运行pecl info mysqlnd_ms,我确实获得了有关mysqlnd_ms插件的信息)：

$sudo pecl install mysqlnd_ms

– 修改后的PHP.ini(之后又重新启动)：

mysqlnd_ms.enable=1
mysqlnd_ms.disable_rw_split=0 ; for good measure
mysqlnd_ms.config_file=mysqlnd_ms_config.ini

-created mysqlnd_ms_config.ini,内容如下(which is given as example in the official doc)

{
    "myapp": {
        "master": {
            "master_0": {
                "host": "127.0.0.1",
                "port": "3306"
            }
        },
        "slave": {
            "slave_0": {
                "host": "localhost",
                "socket": "\/var\/run\/mysqld\/mysqld.sock"
            }
        }
    }
}

According to the documentation：

The plugin executes read-only statements on the configured MySQL
slaves, and all other queries on the MySQL master. Statements are
considered read-only if they either start with SELECT, the SQL hint
/ms=slave/, or if a slave had been chosen for running the previous
query and the query starts with the SQL hint /ms=last_used/. In all
other cases, the query will be sent to the MySQL replication master
server

所以在这一点上我期望我的SELECT语句被发送到slave,而其他语句(例如UPDATE)将被发送到master.

我写了一个小脚本来测试设置：

$socket = '/var/run/mysqld/mysqld.sock';
$dbname = 'mysqlnsmstest';
$user = 'root';
$pass = 'root';

$mysql = new PDO("mysql:unix_socket=$socket;dbname=$dbname", $user, $pass);

$result = $mysql->query('SELECT * FROM mytable');
foreach($result as $row) {
    print_r($row);
}

$count = $mysql->exec("UPDATE mytable SET field='test' WHERE id=2");
echo "Nb rows affected: $count\n";

查询正确执行但它们都被发送到奴隶(我知道这是因为如果我用$tcpdump -ni嗅探流量任何端口3306我什么都看不到,而如果我在3306上进行手动查询它们确实出现在tcpdump的).

使用/ * ms = slave * /和/ * ms = master * /等注释没有区别. general_log确实显示没有任何其他注释可能会混淆mysqlns_ms：

121118 19:14:40    36 Connect   root@localhost on mysqlnsmstest
           36 Query /*ms=slave*/SELECT * FROM mytable
           36 Query /*ms=master*/UPDATE mytable SET field='test' WHERE id=2
           36 Quit  

我尝试使用非环回IP(例如我的10.0.0.56本地IP)来“强制”通过网络连接,但它没有任何区别.

$pdo-> getAttribute(PDO :: ATTR_CLIENT_VERSION)给我“mysqlnd 5.0.10 – 20111026 – $Id：b0b3b15c693b7f6aeb3aa66b646fee339f175e39,显示正在使用mysqlnd.

为了使读/写拆分工作(我欢迎任何建议),我缺少什么？

更新：
我找到了比tcpdump更好的方法来检查读/写拆分是否正常工作：

print_r(mysqlnd_ms_get_last_used_connection($pdo));
Array
(
    [scheme] => unix:///var/run/mysqld/mysqld.sock
    [host_info] => Localhost via UNIX socket
    [host] => 
    [port] => 3306
    [socket_or_pipe] => /var/run/mysqld/mysqld.sock
    [thread_id] => 48
    [last_message] => Rows matched: 1  Changed: 0  Warnings: 0
    [errno] => 0
    [error] => 
    [sqlstate] => 00000
)

解决方法:

请确保在尝试建立连接时引用定义服务器的PECL / mysqlnd_ms文档部分.您应该在您的示例中传递节名称 – “myapp” – 作为您要使用的PHP MySQL API的connect函数的主机.像这样的东西：

$pdo = new PDO('mysql:host=myapp;dbname=database', 'username', 'password');

或者,在您的情况下,例如：

$mysql = new PDO("mysql:host=myapp;dbname=$dbname", $user, $pass);

不使用：

$mysql = new PDO("mysql:unix_socket=$socket;dbname=$dbname", $user, $pass);

这将连接到正在侦听套接字$socket的服务器.

标签：php,mysql,split,pdo,read-write
来源： https://codeday.me/bug/20190517/1123828.html