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Replication has its problems, specially if you have a multimaster replication system. To make matters worse, none of the PHP frameworks support multimaster replication systems nor handle master failover. Symfony uses Propel and only supports master-slave replication systems. When the master fails, it’s true that you have the slaves ready to replace it, but the process of detecting the failure and acting upon it requires human intervention. Zend Framework, on the other hand, doesn’t support replication at all.