ACM SIGOPS Operating Systems Review
Unifying thread-level speculation and transactional memory
Proceedings of the 13th International Middleware Conference
SCORe: a scalable one-copy serializable partial replication protocol
Proceedings of the 13th International Middleware Conference
Hyflow2: a high performance distributed transactional memory framework in scala
Proceedings of the 2013 International Conference on Principles and Practices of Programming on the Java Platform: Virtual Machines, Languages, and Tools
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In this work we present OSARE, an active replication protocol for transactional systems that combines the usage of Optimistic Atomic Broadcast with a speculative concurrency control mechanism in order to overlap transaction processing and replica synchronization. OSARE biases the speculative serialization of transactions towards an order aligned with the optimistic message delivery order. However, due to the lock-free nature of its concurrency control algorithm, at high concurrency levels, namely when the probability of mismatches between optimistic and final deliveries is higher, OSARE explores additional alternative transaction serialization orders in a lightweight and opportunistic fashion. A simulation study we carried out in the context of Software Transactional Memory systems shows that OSARE achieves robust performance also in scenarios characterized by non-minimal likelihood of reorder between optimistic and final deliveries, providing remarkable speed-up with respect to state of the art speculative replication protocols.