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I created a custom module and to try to override vendor/magento/framework/DB/Adapter/Pdo/Mysql.php and vendor/magento/zendframework1/library/Zend/Db/Adapter/Abstract.php

but

<preference for="Magento\Framework\DB\Adapter\Pdo\Mysql" type="Test\MySQLCluster\DB\Adapter\Pdo\Mysql" />

does not work for vendor/magento/framework/DB/Adapter/Pdo/Mysql.php

And for vendor/magento/zendframework1/library/Zend/Db/Adapter/Abstract.php I don`t know how to do it.

0

A normal preference won't work indeed, but you can copy it to the lib directory. It's not a very clean way of working but in this case required.

lib/internal/Magento/Framework/DB/Adapter/Pdo/Mysql.php

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