TUWIENDSG

To illustrate the concept of elastic service, let us consider the following example. We have a data-as-a-service (DaaS) application for an M2M cloud platform-as-a-service, for which we have user-defined elasticity requirements w.r.t service run-time performance and cost (e.g., overall response time < X, and cost/client/h < Y$)... In conclusion, the VM monitoring paradigm in which the virtual machine is the core monitored entity is not sufficient for supporting elasticity controllers. We need something more than just monitoring information associated with VMs possibly grouped in clusters, as more service topologies could have different service units deployed over virtual machines in the same or different virtual clusters (e.g, high network performance clusters). With this in mind, we have developed MELA for monitoring and analyzing the elasticity behavior of cloud applications.