Stateful service with partial replication

According to an example embodiment of the present invention, there is provided an apparatus comprising at least one processing core, at least one memory including computer program code, the at least one memory and the computer program code being configured to, with the at least one processing core, cause the apparatus at least to cause at least one first node to be provided with software and initialized with data, cause the at least one first node to be set to a slave mode, cause a load balancer to be updated with information concerning the at least one first node, and terminate at least one second node, and in connection with terminating the at least one second node, set the at least one first node to an active mode.