PaxosStore

Abstract

In this paper, we present PaxosStore, a high-availability storage system developed to support the comprehensive business of WeChat. It employs a combinational design in the storage layer to engage multiple storage engines constructed for different storage models. PaxosStore is characteristic of extracting the Paxos-based distributed consensus protocol as a middleware that is universally accessible to the underlying multi-model storage engines. This facilitates tuning, maintaining, scaling and extending the storage engines. According to our experience in engineering practice, to achieve a practical consistent read/write protocol is far more complex than its theory. To tackle such engineering complexity, we propose a layered design of the Paxos-based storage protocol stack, where PaxosLog, the key data structure used in the protocol, is devised to bridge the programming-oriented consistent read/write to the storage-oriented Paxos procedure. Additionally, we present optimizations based on Paxos that made fault-tolerance more efficient. Discussion throughout the paper primarily focuses on pragmatic solutions that could be insightful for building practical distributed storage systems.

Encryption methods on major telecommunication applications and thoughts

“…This can also be found when ThinkImpact.com [6] reports the WhatsApp Statistics on how over time it has become one of the most popular communication apps compared to others globally. From the paper PaxosStore: High-availability Storage Made Practical in WeChat [7]by Jiajun Zheng, Qian Lin, Jiatao Xu, Cheng Wei, Chuwei Zeng, Pingan Yang, and Yunfan Zhang, we learn how the storage creates the space to support the data structure to and build the storage layer for the need of its AES encryption. From the paper The Forensic Analysis of WeChat Message [8]by Lijun Zhang, FEI Yu, and Qingbing Ji from Science and Technology on Communication Security Laboratory, the storage principle help build the data forensics of WeChat messages with the SQLite format.…”