fix while loop in SyncWithStandby

[MrGuin]

Summary by CodeRabbit

• Chores
  • Adjusted how pending requests are handled during snapshot synchronization to preserve tasks for continued evaluation rather than removing them immediately.

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[coderabbitai]

Walkthrough

The SnapshotManager::SyncWithStandby method is modified to retain pending requests that remain covered by the current snapshot, instead of immediately erasing them. The iterator is incremented to prevent re-evaluation of the same element during iteration.

Changes

Cohort / File(s)	Summary
Pending Request Iteration Logic tx_service/src/store/snapshot_manager.cpp	Modified control flow in SyncWithStandby to preserve pending request entries by advancing the iterator instead of erasing covered requests, enabling re-evaluation on subsequent cycles

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

• Area of focus: Verify that the iterator advancement logic correctly prevents infinite loops and that pending requests remain in a valid state for re-evaluation
• Concern: Ensure the change doesn't cause pending requests to be retained indefinitely if conditions never change

Poem

A rabbit hops through pending queues,
No hasty erasures, no snap-to reviews!
Each request preserved, each iterator advanced,
Through snapshot and standby, they're elegantly danced. 🐰✨

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The pull request description is empty, missing all required template sections including tests, documentation, issue references, and testing confirmation.	Add a complete description following the template, including test additions, documentation, issue reference (fixes eloqdb/tx_service#issue_id), and confirmation of passing the required test suite.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly describes the main change: fixing a while loop in the SyncWithStandby function, which aligns with the code modification that adjusts loop control flow.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix_sync_with_standby

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[coderabbitai]

Actionable comments posted: 0

🧹 Nitpick comments (1)

tx_service/src/store/snapshot_manager.cpp (1)

205-209: Iterator advancement correctly fixes the loop; minor comment nit

Adding it++ here is the right fix: in the “covered” branch you now either erase the element or advance the iterator, so the while (it != pending_req_.end()) loop can’t get stuck repeatedly visiting the same entry while holding standby_sync_mux_. This also matches the completion logic later (lines 280–314) which expects the entry to remain in pending_req_ until it decides whether to erase it.

Very minor: the comment is split mid‑sentence across four lines; you might rewrap it so “don’t loop on the same element indefinitely” isn’t broken in half.

📜 Review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 60e2343 and 9275058.

📒 Files selected for processing (1)

• tx_service/src/store/snapshot_manager.cpp (1 hunks)

🧰 Additional context used

🪛 Cppcheck (2.18.0)

tx_service/src/store/snapshot_manager.cpp

[information] Limiting analysis of branches. Use --check-level=exhaustive to analyze all branches.

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