Building reliable applications for the cloud is challenging because of unpredictable failures during a program’s execution. This paper presents a programming framework, called Reliable State Machines (RSMs), that offers fault-tolerance by construction. In our framework, an application comprises several (possibly distributed) RSMs that communicate with each other via messages, much in the style of actor-based programming. Each RSM is fault-tolerant by design, thereby offering the illusion of being "always-alive". An RSM is guaranteed to process each input request exactly once, as one would expect in a failure-free environment. The RSM runtime automatically takes care of persisting state and rehydrating it on a failover. We present the core syntax and semantics of RSMs, along with a formal proof of failure-transparency. We provide a .NET implementation of the RSM framework for deploying services to Microsoft Azure. We carry out an extensive performance evaluation on micro-benchmarks to show that one can build high-throughput applications with RSMs. We also present a case study where we rewrite a significant part of a production cloud service using RSMs. The resulting service has simpler code and exhibits production-grade performance.
@InProceedings{mukherjee_et_al:LIPIcs.ECOOP.2019.18, author = {Mukherjee, Suvam and Raj, Nitin John and Govindraj, Krishnan and Deligiannis, Pantazis and Ravichandran, Chandramouleswaran and Lal, Akash and Rastogi, Aseem and Krishnaswamy, Raja}, title = {{Reliable State Machines: A Framework for Programming Reliable Cloud Services}}, booktitle = {33rd European Conference on Object-Oriented Programming (ECOOP 2019)}, pages = {18:1--18:29}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-111-5}, ISSN = {1868-8969}, year = {2019}, volume = {134}, editor = {Donaldson, Alastair F.}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2019.18}, URN = {urn:nbn:de:0030-drops-108101}, doi = {10.4230/LIPIcs.ECOOP.2019.18}, annote = {Keywords: Fault tolerance, Cloud computing, Actor framework} }
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