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"Federated Denial of Service" Federated storage engine used to attempt to open connections within the ::create() and ::open() methods which are invoked while LOCK_open mutex is being held by mysqld. As a result, no other client sessions can open tables while Federated is attempting to open a connection. Long DNS lookup times would stall mysqld's operation and a rogue connection string which connects to a remote server which simply stalls during handshake can stall mysqld for a much longer period of time. This patch moves the opening of the connection much later, when the federated actually issues queries, by which time the LOCK_open mutex is no longer being held.
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