Symfony 2.7 cache:clear command checks every database connection

Question

I just have upgraded to symfony 2.7, and have a annoying behaviour.

Some connections in my config.yml are optionables, and describe foreign databases that are not intended to be used in every prod instances.

When doing a cache:clear , it seems that now every connections are checked, even if I don't want them to be active on a particular server.

When setting the --no-warmup option, the problem occurs half the time

php app/console cache:clear --env=prod --no-warmup --verbose 

[Doctrine\DBAL\Exception\ConnectionException]
An exception occured in driver: SQLSTATE[42000] [1049] Unknown database 'bal_syncrho_database'

Exception trace: () at /var/www/ror3/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php:103 Doctrine\DBAL\Driver\AbstractMySQLDriver->convertException() at /var/www/ror3/vendor/doctrine/dbal/lib/Doctrine/DBAL/DBALException.php:133 Doctrine\DBAL\DBALException::driverException() at /var/www/ror3/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOMySql/Driver.php:47 Doctrine\DBAL\Driver\PDOMySql\Driver->connect() at /var/www/ror3/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php:360 Doctrine\DBAL\Connection->connect() at /var/www/ror3/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php:429 Doctrine\DBAL\Connection->getDatabasePlatformVersion() at /var/www/ror3/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php:389 Doctrine\DBAL\Connection->detectDatabasePlatform() at /var/www/ror3/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php:328 Doctrine\DBAL\Connection->getDatabasePlatform() at /var/www/ror3/vendor/doctrine/orm/lib/Doctrine/ORM/Mapping/ClassMetadataFactory.php:763 Doctrine\ORM\Mapping\ClassMetadataFactory->getTargetPlatform() at /var/www/ror3/vendor/doctrine/orm/lib/Doctrine/ORM/Mapping/ClassMetadataFactory.php:616 Doctrine\ORM\Mapping\ClassMetadataFactory->completeIdGeneratorMapping() at /var/www/ror3/vendor/doctrine/orm/lib/Doctrine/ORM/Mapping/ClassMetadataFactory.php:174 Doctrine\ORM\Mapping\ClassMetadataFactory->doLoadMetadata() at /var/www/ror3/vendor/doctrine/common/lib/Doctrine/Common/Persistence/Mapping/AbstractClassMetadataFactory.php:332 Doctrine\Common\Persistence\Mapping\AbstractClassMetadataFactory->loadMetadata() at /var/www/ror3/vendor/doctrine/orm/lib/Doctrine/ORM/Mapping/ClassMetadataFactory.php:78 Doctrine\ORM\Mapping\ClassMetadataFactory->loadMetadata() at /var/www/ror3/vendor/doctrine/common/lib/Doctrine/Common/Persistence/Mapping/AbstractClassMetadataFactory.php:216 Doctrine\Common\Persistence\Mapping\AbstractClassMetadataFactory->getMetadataFor() at /var/www/ror3/vendor/doctrine/common/lib/Doctrine/Common/Persistence/Mapping/AbstractClassMetadataFactory.php:115 Doctrine\Common\Persistence\Mapping\AbstractClassMetadataFactory->getAllMetadata() at /var/www/ror3/vendor/symfony/symfony/src/Symfony/Bridge/Doctrine/CacheWarmer/ProxyCacheWarmer.php:69 Symfony\Bridge\Doctrine\CacheWarmer\ProxyCacheWarmer->warmUp() at /var/www/ror3/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/CacheWarmer/CacheWarmerAggregate.php:48 Symfony\Component\HttpKernel\CacheWarmer\CacheWarmerAggregate->warmUp() at /var/www/ror3/app/bootstrap.php.cache:2641 Symfony\Component\HttpKernel\Kernel->initializeContainer() at /var/www/ror3/app/bootstrap.php.cache:2411 Symfony\Component\HttpKernel\Kernel->boot() at /var/www/ror3/vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Console/Application.php:70 Symfony\Bundle\FrameworkBundle\Console\Application->doRun() at /var/www/ror3/vendor/symfony/symfony/src/Symfony/Component/Console/Application.php:120 Symfony\Component\Console\Application->run() at
/var/www/ror3/app/console:27

Answer 1

Doctrine is trying to determine the Database Platform Version.

You can avoid this behaviour adding in the Doctrine DBAL Configuration the server version. From the doc:

The server_version option was added in Doctrine DBAL 2.5, which is used by DoctrineBundle 1.3. The value of this option should match your database server version (use postgres -V or psql -V command to find your PostgreSQL version and mysql -V to get your MySQL version).

If you don't define this option and you haven't created your database yet, you may get PDOException errors because Doctrine will try to guess the database server version automatically and none is available.

As example:

#config.yml  doctrine:     dbal:     ...         server_version:       5.6 

Hope this help