Logical Clock System for Distributed Event Ordering
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Solution Overview
Problem
Distributed systems lack a global clock that provides accurate time to all networked machines, leading to challenges in event ordering, conflict resolution, and staleness detection due to independent component failures and clock skew uncertainties.
Innovation Solution
A logical clock system with bounded uncertainty is introduced, where a global time source node sets a global timestamp using message exchange between nodes, enabling strong consistency and efficient event ordering, conflict resolution, and staleness detection across the distributed system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a global clock is implemented in a distributed system, then time synchronization and event ordering accuracy are improved, but system complexity and failure points increase
Solution Approach 1:
The patent introduces logical clocks as intermediary components at each node that mediate between local hardware clocks and the need for global event ordering. Each node maintains a logical clock that increments with local events and synchronizes with neighbors through message exchange, avoiding the need for a centralized global clock while achieving time synchronization accuracy.
Solution Approach 2:
The patent divides the global time synchronization problem into local segments by implementing logical clocks at individual nodes. Each node independently manages its own logical clock and synchronizes with adjacent nodes through bounded uncertainty intervals, breaking down the complex global synchronization task into manageable local operations.
2Measurement precision
If logical clock synchronization is performed frequently to reduce uncertainty, then time accuracy is improved, but network bandwidth consumption and processor loads increase
Solution Approach 1:
The patent implements periodic logical clock synchronization where nodes exchange timestamp messages at regular intervals rather than continuously. This periodic action maintains time synchronization accuracy within bounded uncertainty while significantly reducing network bandwidth consumption compared to continuous synchronization.
Solution Approach 2:
The logical clock system operates autonomously at each node, with nodes independently maintaining their own clock state and only exchanging minimal timestamp information when needed. This self-service approach reduces processor loads and network traffic compared to centralized clock management.
3Stability of the object's composition
If bounded uncertainty intervals are maintained through message exchange, then event ordering consistency is improved, but message overhead and system latency increase
Solution Approach 1:
The patent pre-establishes bounded uncertainty intervals between nodes through initial message exchange, allowing nodes to determine event ordering consistency without continuous communication. This preliminary action creates a stable foundation for event ordering that reduces subsequent message overhead and system latency.
4Reliability
If the system tolerates component failures, then availability is improved, but clock skew uncertainty increases
Solution Approach 1:
The patent incorporates bounded uncertainty intervals as a cushion that accommodates clock skew variations caused by component failures. By pre-establishing these uncertainty bounds, the system can tolerate failures and node departures while maintaining event ordering consistency, improving availability without completely sacrificing synchronization accuracy.
Data Source
AI summary
Examples of the disclosure provide for providing a global timestamp in a distributed system. A plurality of nodes are connected via a network. A logical clock is implemented on a node of the plurality of nodes. The logical clock sets a global time for the network, such that another node of the plurality of nodes labels a local event with a global timestamp interval based on the global time provided by the logical clock.