Improving Reliability of Dynamic Software Updating Using Runtime Recovery.

Dynamic software updating (DSU) is a technique that can update running software systems without stopping them. Most existing approaches require programmer participation to guarantee the correctness of dynamic updating. However, manually preparing dynamic updating is error-prone and time-consuming. Therefore, other approaches prefer to aggressively perform updating without programmer intervention, which may definitely lead to unanticipated runtime errors. To reduce human effort and enhance the reliability for dynamic updating, we leverage automatic runtime recovery (ARR) techniques to recover runtime errors caused by improper dynamic updating. This paper presents ADSU, a fully automatic DSU system using ARR. We evaluate ADSU with real updates from widely used open source software systems, i.e., Apache Tomcat, Apache FTP Server and jEdit. The preliminary results have shown that ADSU succeeds in automatically applying 11 of 16 real-world updates that existing counterparts cannot.