Hierarchical Timestamp Management for Tree Data Conflict Resolution
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Solution Overview
Problem
Existing data reconciliation methods face challenges in efficiently merging inconsistent replicas of data items, particularly in resolving conflicts between replicas modified at different computing devices, where conflicts arise due to differing values or changes in key-value pairs without clear timestamp-based resolution.
Innovation Solution
The system employs hierarchical timestamp management, where timestamps are recorded at the root of changes rather than at every key in the tree, allowing for deterministic conflict resolution by prioritizing values from devices with later modifications, ensuring commutative and idempotent merging processes, and reducing computational resources needed for merging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If timestamps are recorded at every key in the tree structure, then conflict resolution precision is improved, but computational overhead and device complexity increase
Solution Approach 1:
The patent segments the timestamp recording function by placing timestamps only at root elements of the hierarchical data structure rather than at every key. This segmentation reduces the number of timestamp operations from O(n) to O(1) per merge operation, directly resolving the contradiction between precision and complexity by strategically positioning timestamp markers only where needed for conflict resolution.
Solution Approach 2:
The patent extracts the timestamp mechanism from a granular per-key level and consolidates it at the root element level. By taking out the timestamp recording from every node and concentrating it at the root, the system maintains sufficient information for conflict resolution while dramatically reducing computational overhead and device complexity.
2Measurement precision
If timestamps are recorded at every key in the tree structure, then conflict detection accuracy is improved, but merging speed deteriorates
Solution Approach 1:
The patent segments timestamp placement to only root elements, enabling O(1) timestamp comparison operations during merges. This segmentation maintains conflict detection accuracy for root-level changes while eliminating the O(n) traversal needed if timestamps were at every key, thus resolving the speed-precision tradeoff.
Solution Approach 2:
The patent performs preliminary timestamp recording at root elements before conflicts occur, establishing a clear temporal ordering mechanism in advance. This preliminary action at strategic points enables rapid conflict detection during merges without requiring exhaustive timestamp checks throughout the entire data structure.
3Reliability
If hierarchical timestamp management is implemented with timestamps at root elements, then data convergence consistency is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by implementing timestamp management specifically at root elements where it provides maximum benefit for conflict resolution. This localized approach ensures data convergence consistency for hierarchical changes while avoiding the complexity of managing timestamps throughout the entire tree structure, as each root timestamp independently governs its subtree's versioning.
Data Source
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AI summary
The subject matter of this specification generally relates to reconciling conflicts between replicas of data. In one aspect, a system obtains a first document that includes a first replica of an object used by an application at a first device and a second document that includes a second replica of the object used by the application at a second device. The system generates a merged document from the first document and the second document. The system determines that the first value for the first key was modified at the first device at a later time than the first value for the first key was modified at the second device. In response, the system includes, in the merged document, the first value for the first key in the first document and, for each descendant element of the first element, a value for the descendant element's key in the first document.