Offline Commit Synchronization for Mobile Media Conflict Resolution
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Solution Overview
Problem
Mobile devices operating offline face challenges in conflict resolution, privacy, and latency when synchronizing changes to remote cloud data, particularly in media applications where multiple users may make conflicting edits or privacy-sensitive changes that are not successfully transmitted.
Innovation Solution
A media application on the mobile device manages synchronization by creating commits for user actions, ensuring preconditions are met before transmission, resolving conflicts by transforming entities locally, and handling rejections by discarding or reapplying commits as needed, while minimizing latency through asynchronous transmission and idempotent transformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If changes are transmitted to the cloud immediately after regaining network connectivity, then synchronization speed is improved, but conflict resolution complexity and latency increase
Solution Approach 1:
The system performs preliminary actions by validating and preparing commits before transmission. The mobile device checks preconditions, resolves local conflicts, and ensures commits are ready for successful transmission, thereby reducing latency and avoiding retransmission delays when network connectivity is restored.
Solution Approach 2:
The system implements feedback mechanisms where the mobile device receives acknowledgment from the server about commit application status. This feedback loop allows the system to understand which commits were successfully applied and which need retransmission, optimizing the synchronization process and reducing unnecessary retransmission delays.
2Stability of the object's composition
If all offline changes are transmitted to the server, then data consistency is improved, but privacy risks increase
Solution Approach 1:
The system extracts and separates privacy-sensitive information from the transmission process. By identifying which changes are truly necessary for data consistency and excluding privacy-sensitive operations from automatic synchronization, the system maintains data consistency while protecting user privacy.
Solution Approach 2:
The system applies different handling qualities to different types of changes. Privacy-sensitive operations are handled locally with enhanced protection, while non-sensitive changes are transmitted for synchronization. This differentiated approach ensures data consistency for necessary changes while maintaining privacy protection for sensitive operations.
3Reliability
If conflict resolution is performed locally, then synchronization reliability is improved, but device complexity increases
Solution Approach 1:
The system segments the conflict resolution process into distinct phases: local validation, precondition checking, and server coordination. By dividing the complex conflict resolution into manageable segments, the mobile device can reliably handle conflicts without implementing overly complex resolution logic.
Solution Approach 2:
The system introduces an intermediary layer of validation and coordination between local changes and server transmission. This intermediary layer handles the complexity of conflict resolution by filtering and preparing commits, thereby improving synchronization reliability while keeping the mobile device's conflict resolution logic manageable.
4Manufacturing precision
If commits are validated before transmission, then data integrity is improved, but transmission time increases
Solution Approach 1:
The system performs validation as a preliminary action during offline preparation. By validating commits and checking preconditions before network connectivity is restored, the system ensures data integrity is maintained while minimizing the time spent on validation during the actual transmission process.
Data Source
AI summary
While a mobile device is not connected to a network, a media application creates a commit that describes changes to be made to entities. The media application determines identifiers associated with the entities. The media application determines whether the entities are resolved or unresolved. The media application transforms the entities that are resolved by applying the changes described in the commit, where a corresponding entity that is unresolved is not transformed until a preceding commit is applied. In response to the mobile device establishing a network connection, the media application transmits the commit to a server for acceptance. Responsive to receiving a notification that the server successfully applied the commit, the media application records an expired version of the commit. Responsive to determining that the server failed to apply the commit, the media application discards the commit.