Client Sync Service Tree State Synchronization

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Solution Overview

Problem

Content management systems face challenges in synchronizing content items across multiple devices due to issues like out-of-order communications, latency, and conflicts between local and remote modifications, which lead to inefficiencies and resource wastage.

Innovation Solution

A client synchronization service uses tree data structures to track the server and file system states, identifying synchronization mismatches and initiating necessary operations to converge these states, thereby ensuring deterministic and incremental synchronization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If content items are synchronized across multiple devices using traditional methods, then users can access content on multiple devices, but synchronization conflicts and inefficiencies occur due to out-of-order communications and latency

Engineering Contradiction:

Improvesynchronization accuracyVSAvoidsynchronization efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The system assigns sequence numbers to synchronization operations before they are executed. This preliminary numbering allows the server to track and reorder operations, ensuring that they are applied in the correct sequence even if communications arrive out of order, thereby resolving synchronization conflicts without retransmission.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The server sends acknowledgment messages back to clients confirming receipt of synchronization operations. This feedback mechanism allows the system to detect lost or out-of-order communications and trigger appropriate retransmission or reordering actions, improving both reliability and efficiency.

Inventive Principle:

Principle #23Feedback

2Reliability

If comprehensive synchronization operations are performed to ensure accurate state convergence, then synchronization accuracy improves, but resource consumption and procedural complexity increase

Engineering Contradiction:

Improvestate synchronization accuracyVSAvoidsynchronization process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The synchronization process is divided into discrete operations, each assigned a unique sequence number. Instead of performing comprehensive synchronization as a single complex operation, the system segments the process into individual file operations (create, delete, modify) that can be tracked and reordered independently, reducing procedural complexity while maintaining accuracy.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system introduces sequence numbers as a new parameter to track synchronization operations. This parameter change transforms the synchronization process from a complex state-comparison problem into a simpler sequence-ordering problem, reducing the complexity of determining what operations need to be performed.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If retransmission is performed to handle lost or out-of-order communications, then communication reliability improves, but time consumption and resource wastage increase

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidsynchronization time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

Sequence numbers are assigned to operations before transmission, allowing the receiving end to automatically reorder operations without requiring retransmission. This preliminary numbering prevents the time loss associated with retransmission while maintaining communication reliability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Acknowledgment messages provide feedback about which operations have been successfully received and processed. This feedback mechanism allows the system to identify only the specific operations that need retransmission rather than retransmitting entire synchronization sets, reducing time consumption.

Inventive Principle:

Principle #23Feedback

4Ease of operation

If local copies are stored on client devices for offline access, then user accessibility improves, but synchronization difficulties and conflict resolution complexity increase

Engineering Contradiction:

Improveoffline access capabilityVSAvoidsynchronization management complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The server maintains a record of the latest sequence numbers for all synchronization operations. When a client connects after being offline, it can quickly determine what operations it needs to retrieve by comparing its local sequence numbers with the server's records, simplifying the resynchronization process without requiring complex conflict detection algorithms.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS10970193B2Debugging a client synchronization service

Publication Date: 2021.04.06 DROPBOX INC

AI summary

The disclosed technology relates to a system configured to generate an initial tree state, wherein the initial tree state includes three tree data structures configured to aid in the synchronization of content items managed by a content management system. The system is configured to provide the initial tree state to a client synchronization service, retrieve a final tree state from the client synchronization service, and determine whether the final tree state is correctly synchronized.