Symfony and doctrine configuration with slave servers

MySQL master-slave config in Symfony

# Doctrine Configuration
doctrine:
    dbal:
        driver:   "%database_driver%"
        host:     "%database_host%"
        port:     "%database_port%"
        dbname:   "%database_name%"
        user:     "%database_user%"
        password: "%database_password%"
        charset:  UTF8
        options:   
                1002: "SET time_zone = '+00:00'"
        slaves:
                slave1:
                        host:     "%database_host%"
                        port:     "%database_port%"
                        dbname:   "%database_name%"
                        user:     "%database_user%"
                        password: "%database_password%"
                        charset:  UTF8
    orm:
        auto_generate_proxy_classes: "%kernel.debug%"
        auto_mapping: true