Research and implementation of a distributed transaction processing middleware

摘要

Currently, increasingly transactional requests require high-performance transaction processing systems as support. The performance of a distributed transaction processing system is superior to that of traditional single-node transaction processing system, and the characteristic of multi-node determines that distributed transaction processing systems should pay more attention to availability. For example, in traditional single-node systems, the performance of Berkeley DB is high, but its shortcoming of not supporting parallel writing across multiple nodes is weakening its availability and scalability in the distributed environment. This paper has designed and implemented a middleware-level distributed transaction processing system called POST, including a distributed database system called POSTBOX which is based on Berkeley DB and data partition, and a distributed transaction processing middleware called POSTMAN. POSTBOX inherits the availability of highly available Berkeley DB, and expands it with data partition. By Partition Replication Body (PRB), POSTBOX overcomes the native weakness of highly available Berkeley DB, which indicates that highly available Berkeley DB does not support parallel writing across multiple nodes; POSTMAN is a middleware adapting PRB. POSTMAN monitors POSTBOX in realtime via Partition Replication Body State Array (PRBSA), and ensures the correctness of transaction processing and transactions migration in the case of node failure. The actual test results show that POST possesses high availability, and has an obvious improvement of write performance compared with highly available Berkeley DB.