Multi-version Execution for the Dynamic Updating of Cloud Applications

Softwares usually need to be updated to fix bugs or add new features. On the other hand, some critical softwares, such as cloud applications, need to provide service continuously, thus should be updated without downtime. Conventional Dynamic Software Updating (DSU) systems try to update programs whi...

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Bibliographic Details
Main Authors: Chen, Feng, Qiang, Weizhong, Jin, Hai, Zou, Deqing, Wang, Duoqiang
Format: Conference Proceeding
Language:English
Subjects:
Analytical models
Applications programs
Cloud
Cloud computing
Computer programs
Conferences
Dynamic software updating
Dynamical systems
Dynamics
Linux
Multi-version
Process control
Prototypes
Servers
Software
Synchronization
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Description
Summary:Softwares usually need to be updated to fix bugs or add new features. On the other hand, some critical softwares, such as cloud applications, need to provide service continuously, thus should be updated without downtime. Conventional Dynamic Software Updating (DSU) systems try to update programs while running, but they hardly consider the communication of the program to be updated with other programs, which may lead to some inconsistency problems. We handle the problem with an improved DSU system by using multi-version execution. 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. We implement a prototype system called MUC (Multi-vesion for Updating of Cloud) on Linux. To verify our prototype, we apply MUC to cloud applications Redis and Ice cast, and evaluate the overhead of MUC at runtime.
ISSN:0730-3157
DOI:10.1109/COMPSAC.2015.130