Problem
Research questions and friction points this paper is trying to address.
Byzantine clients
database integrity
client-centric architecture
Sintr: Safe Interactive Transactions in the Presence of Byzantine Clients
🤖 AI Summary
Sintr通过冗余执行和灵活的策略框架防止拜占庭客户端破坏数据库完整性，解决了BFT系统中性能与开发者便利性之间的矛盾。
📝 Abstract
Byzantine fault-tolerant (BFT) systems are, in principle, an appealing foundation for transactional applications involving mutually distrustful participants. Yet their adoption has been hampered by two persistent stumbling blocks-performance and developer convenience-which are often in tension with one another. Recent systems show promising progress on both fronts by shifting to a client-centric architecture; clients execute transactions locally and concurrently, while the system resolves any data conflicts to maintain database serializability. We argue that, in its current form, this approach introduces a critical vulnerability: it leaves the integrity of the database exposed to Byzantine clients, which may issue malicious or incorrect transactions. We address this threat with Sintr, a framework that prevents Byzantine clients from compromising database integrity by executing rogue transactions. Sintr combines redundant execution to validate transaction outcomes with a flexible, heterogeneous policy framework for expressing an application's data-integrity requirements. We apply Sintr to harden several existing BFT database systems and find that it imposes only modest overheads-3%-16% in throughput and 3%-21% in latency.
Innovation
Methods, ideas, or system contributions that make the work stand out.
redundant execution
heterogeneous policy framework
Byzantine clients
data integrity
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