fix snapshot coverage check for snapshot sync requests#292
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WalkthroughA single-condition change in SnapshotManager::SyncWithStandby now uses greater-than-or-equal (>=) when comparing Changes
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~20 minutes
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Pre-merge checks and finishing touches❌ Failed checks (1 warning)
✅ Passed checks (2 passed)
✨ Finishing touches
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| if (pending_task_subscribe_id >= current_subscribe_id) | ||
| { | ||
| LOG(WARNING) | ||
| << "The snapshot generated at subscribe counter: " | ||
| << current_subscribe_id | ||
| << ", does not cover the task subscribe id: " | ||
| << pending_task_subscribe_id << ". Wait for next round"; | ||
| covered = false; |
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#!/bin/bash
# Search for subscribe_id comparisons and test files
echo "=== Subscribe ID comparisons in snapshot_manager ==="
rg -n 'subscribe_id.*[<>=]' tx_service/src/store/snapshot_manager.cpp | head -30
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fd -type f -name '*snapshot*' -path '*/test*' 2>/dev/null
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wc -l tx_service/src/store/snapshot_manager.cppRepository: eloqdata/tx_service
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cd tx_service && git log --oneline -10 src/store/snapshot_manager.cpp 2>/dev/null || echo "Git history not available"
echo -e "\n=== Check if line 192 shows the actual change ==="
cd tx_service && git diff HEAD~1 src/store/snapshot_manager.cpp 2>/dev/null | grep -A5 -B5 'subscribe_id' | head -40 || echo "Git diff not available"Repository: eloqdata/tx_service
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echo -e "\n=== Search for subscribe_id in test files ==="
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Test coverage for the equal subscribe ID edge case.
The change from > to >= at line 192 aligns with the exclusive semantics indicated by the comment "data committed before subscribe timepoint"—a snapshot at subscribe_id X covers only requests with subscribe_id < X. The operator is correct: when pending_task_subscribe_id >= current_subscribe_id, the snapshot does not cover the pending task.
The comparison at line 315 uses <= but does not conflict with line 192, as it operates in a different context: line 315 performs cleanup during the snapshot completion callback (checking if a pending request has been satisfied), while line 192 performs coverage checking during snapshot dequeue (before sending). These serve different purposes despite appearing structurally similar.
However, add a test to cover the edge case where pending_task_subscribe_id == current_subscribe_id to validate that the task is correctly deferred to the next round.
🤖 Prompt for AI Agents
In tx_service/src/store/snapshot_manager.cpp around lines 192 to 199 and related
logic near line 315, add a unit/integration test that exercises the edge case
where pending_task_subscribe_id == current_subscribe_id to ensure the snapshot
does not cover the task and the task is deferred to the next round; the test
should set up a snapshot with subscribe_id X, enqueue a pending request with
subscribe_id X, assert that the dequeue/coverage logic marks it as not covered
(matching the >= branch) and that subsequent snapshot completion/cleanup logic
does not incorrectly mark it satisfied (the behavior checked around line 315),
then confirm the task is processed in the next snapshot round.
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