fix/TD-38495-snapshot-start-receiver-writer-error

[cadem]

Description

Please briefly describe the code changes in this pull request.

Checklist

Please check the items in the checklist if applicable.

• Is the user manual updated?
• Are the test cases passed and automated?
• Is there no significant decrease in test coverage?

[gemini-code-assist]

Summary of Changes

Hello @cadem, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the robustness and clarity of the snapshot synchronization mechanism. It addresses a subtle bug in signature comparison logic, ensuring correct flow control. Additionally, it refines logging messages to provide more precise feedback during snapshot writer operations and improves code readability by adding explanatory comments to complex conditional logic.

Highlights

• Bug Fix: The snapshotReceiverSignatureCmp function now correctly returns the comparison result (code) instead of always returning 0, which was a logical error.
• Improved Logging: Error and informational messages within the snapshotReceiverStartWriter function have been updated for enhanced clarity and consistency, specifically by adding 'writer' to relevant messages and refining an existing error message.
• Code Readability: Comments have been added to the syncNodeOnSnapshotPrep function to explicitly clarify the logic branches based on the return value of the snapshotReceiverSignatureCmp function.

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[gemini-code-assist]

Code Review

This pull request fixes a critical bug in snapshotReceiverSignatureCmp where it would always return 0, preventing correct handling of snapshot messages. The change to return the actual comparison result is a good first step. However, I've identified a remaining logical flaw in the same function where the comparison precedence between term and startTime is not correctly handled, which could lead to incorrect behavior. I've provided a detailed comment with a suggested fix for this critical issue. The other changes in this PR are minor but useful improvements to logging messages and comments, which enhance code clarity.