MUC: Updating cloud applications dynamically via multi-version execution

We propose an improved DSU system to update cloud applications dynamically, and utilize the multi-version execution approach to handle the inconsistent issue. When a new update arrives, instead of updating the application to the new version, we fork a new process of the old version and dynamically update it to the new version, then make these two versions run concurrently until the update finishes. To show the feasibility of the proposed solution, a prototype system called MUC (Multi-version execution for Updating of Cloud) is implemented on Linux, and MUC is applied to update three cloud applications, Redis, Memcached, and Icecast.