Problem: version mismatch happen occasionally #1759
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Solution: - make sure don't load iavl version ahead of versiondb
WalkthroughThis pull request introduces a changelog entry documenting a bug fix for an occasional version mismatch issue and updates the application’s initialization logic. The Changes
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yihuang
requested review from
calvinaco,
leejw51crypto and
mmsqe
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Signed-off-by: yihuang <[email protected]>
Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #1759 +/- ##
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+ Coverage 16.87% 35.59% +18.71%
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Files 72 127 +55
Lines 6163 11966 +5803
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+ Hits 1040 4259 +3219
- Misses 5000 7279 +2279
- Partials 123 428 +305
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🧹 Nitpick comments (1)
app/app.go (1)
1044-1068: Consider adding explicit logging before exiting on version mismatchRight now, the app silently calls
tmos.Exit(...)when discovering version mismatches. Logging bothqmsVersionandiavlVersionright before forcing an exit would improve debugging when such mismatches happen, providing clearer insights into the root cause of the failure.
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🔇 Additional comments (1)
app/app.go (1)
1506-1512: LGTMThis utility function cleanly encapsulates the store loading mechanism for a given version. The approach aligns well with ensuring the IAVL store is loaded at the correct version when versiondb is enabled.
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🧹 Nitpick comments (1)
memiavl/db.go (1)
563-574: Added version safety checks to prevent WAL corruption.The change adds necessary validation to ensure that an old version is not written to the WAL, which helps prevent version mismatch issues. This is a good improvement for data integrity.
Consider adding a debug log or metric counter to track when these conditions occur, as they may indicate other issues in the system that need addressing.
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memiavl/db.go
[high] 616-616: G115: integer overflow conversion int -> uint64
(gosec)
[high] 617-617: G115: integer overflow conversion int -> uint64
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🔇 Additional comments (1)
memiavl/db.go (1)
603-621:✅ Verification successful
Enhanced WAL entry validation in async commit path.
This change correctly prevents outdated entries from being written to the WAL in the asynchronous commit path, which aligns with the fix for version mismatch problems mentioned in the PR objectives.
The static analysis tool flagged potential integer overflow issues in the type conversion at lines 616-617. Let's verify this risk:
While this is likely a false positive since
icomes from the loop overentrieswhich is unlikely to reach the maximum integer value, it's good to be aware of this edge case.
🏁 Script executed:
#!/bin/bash # Check if the entries slice could ever be large enough to cause integer overflow rg -A 10 "channelBatchRecv" memiavl/db.goLength of output: 488
Review Approved: WAL entry validation safely handles asynchronous commits and integer conversions.
The current implementation correctly prevents outdated WAL entries. Our investigation confirms that:
- The static analysis flag for potential integer overflow (in the conversion at lines 616–617) is a false positive, as the loop counter
icomes from theentriesslice—which, populated viachannelBatchRecv, is never expected to grow large enough to trigger an overflow.- The verified behavior of
channelBatchRecvconfirms that the slice size remains within safe boundaries.No modifications are required here.
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[high] 616-616: G115: integer overflow conversion int -> uint64
(gosec)
[high] 617-617: G115: integer overflow conversion int -> uint64
(gosec)
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convert to draft for now, probably no existing integration test cover this. |
Signed-off-by: yihuang <[email protected]>
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Actionable comments posted: 2
🧹 Nitpick comments (10)
memiavl/db_test.go (2)
532-532: Fix typo in comment"intermidiate" should be "intermediate"
- // reload db from disk at an intermidiate version + // reload db from disk at an intermediate version🧰 Tools
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532-532:
intermidiateis a misspelling ofintermediate(misspell)
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[failure] 532-532:
intermidiateis a misspelling ofintermediate(misspell)
509-521: Consider parameterizing the test with different data patternsThe test currently uses a single pattern for generating test data. For more thorough testing, consider parameterizing with different data patterns or randomized values.
- for i := 0; i < 10; i++ { + numChangeSets := 10 + for i := 0; i < numChangeSets; i++ {memiavl/db.go (2)
446-452: Fix typo in error message"propogate" should be "propagate"
- // background snapshot rewrite don't success, but no error to propogate, ignore it. + // background snapshot rewrite don't success, but no error to propagate, ignore it.🧰 Tools
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451-451:
propogateis a misspelling ofpropagate(misspell)
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[warning] 446-449: memiavl/db.go#L446-L449
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[warning] 452-452: memiavl/db.go#L452
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[failure] 451-451:
propogateis a misspelling ofpropagate(misspell)
609-613: Add test coverage for WAL error handlingThe error handling path for WAL LastIndex failures in async commits is not covered by tests according to the code coverage report. Consider adding tests that simulate these failures.
Would you like me to help draft tests that would cover these error scenarios?
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[warning] 610-612: memiavl/db.go#L610-L612
Added lines #L610 - L612 were not covered by testsapp/storeloader.go (2)
27-32: Add comments explaining the upgrade logic flowThe upgrade logic could benefit from more detailed comments explaining the different paths and conditions. This would make maintenance easier for future developers.
return func(ms storetypes.CommitMultiStore) error { if upgradeHeight == ms.LastCommitID().Version+1 { // Check if the current commit version and upgrade height matches + // If there are store upgrades, we need to apply them regardless of the version cap if len(storeUpgrades.Renamed) > 0 || len(storeUpgrades.Deleted) > 0 || len(storeUpgrades.Added) > 0 { return ms.LoadLatestVersionAndUpgrade(storeUpgrades) } } + // No upgrades to apply, or not at the upgrade height, so just load the capped version // Otherwise load default store loader return MaxVersionStoreLoader(version)(ms)
1-38: Add unit tests for the store loadersThese functions lack test coverage according to the coverage report. Since they're critical for version control and upgrades, they should have dedicated unit tests.
Would you like me to help draft unit tests for these store loader functions?
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[warning] 15-17: app/storeloader.go#L15-L17
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[warning] 35-35: app/storeloader.go#L35
Added line #L35 was not covered by testsintegration_tests/test_versiondb.py (2)
40-42: Consider making the block wait count configurable.
Using a hard-coded wait of 5 blocks here may be too rigid. In environment-specific or slower chains, you might need a different number of blocks to ensure consistent test results.
52-54: Fix minor spelling error in comment.
There's a typo in "intermidiate". Please apply the below fix:- # only restore to an intermidiate version to test version mismatch behavior + # only restore to an intermediate version to test version mismatch behaviorapp/app.go (2)
962-965: Handle setupVersionDB errors more gracefully.
Currently, any setup error leads to a panic. Depending on your requirements, consider logging and terminating with a more descriptive message or permitting fallback behavior to avoid abrupt termination.
978-982: Correct the variable name spelling.
“storeLoaderOverritten” should ideally be “storeLoaderOverridden” to avoid typos and maintain clarity.- storeLoaderOverritten := app.RegisterUpgradeHandlers(app.appCodec, qmsVersion) + storeLoaderOverridden := app.RegisterUpgradeHandlers(app.appCodec, qmsVersion)
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CHANGELOG.md(1 hunks)app/app.go(2 hunks)app/storeloader.go(1 hunks)app/upgrades.go(2 hunks)integration_tests/shell.nix(1 hunks)integration_tests/test_versiondb.py(3 hunks)memiavl/db.go(6 hunks)memiavl/db_test.go(2 hunks)
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memiavl/db_test.go
532-532: intermidiate is a misspelling of intermediate
(misspell)
memiavl/db.go
451-451: propogate is a misspelling of propagate
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memiavl/db_test.go
[failure] 532-532:
intermidiate is a misspelling of intermediate (misspell)
memiavl/db.go
[failure] 451-451:
propogate is a misspelling of propagate (misspell)
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🔇 Additional comments (14)
memiavl/db_test.go (2)
502-547: Good test for idempotent writing behavior!This test effectively validates that the database can produce the same state when reloaded at an intermediate version and then replayed with changes. This is crucial for ensuring consistency during recovery scenarios.
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532-532:
intermidiateis a misspelling ofintermediate(misspell)
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[failure] 532-532:
intermidiateis a misspelling ofintermediate(misspell)
533-541:❓ Verification inconclusive
Verify edge case scenarios for version loading
The test loads at version 5 and replays from there, but doesn't test edge cases like loading at the first version or at the latest version minus one. These scenarios could reveal different behaviors.
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#!/bin/bash # Description: Check if the test handles all edge cases for version loading. # Test additional version scenarios in other tests rg -A 3 "TargetVersion" memiavl/db_test.goLength of output: 255
Revisit Version Loading Edge Cases
Inmemiavl/db_test.go(lines 533–541), the test only loads a fixed version (5) before replaying changes. However, there aren’t any tests covering edge scenarios such as loading the very first version or one just before the latest. Testing these cases could uncover subtle differences in behavior.
- Consider adding a test for loading the initial version (e.g. version 0 or 1, per system design).
- Consider adding a test for loading near the latest version (e.g. latest version - 1) to ensure robustness.
memiavl/db.go (3)
84-85: Good optimization with reusable write batchAdding a reusable write batch is a good optimization that avoids frequent allocations during write operations.
567-578: Improved batch-based commit mechanismThe previous implementation was writing directly to the WAL. The new batch-based approach provides better atomicity and error handling.
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[warning] 574-575: memiavl/db.go#L574-L575
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1116-1128: Good implementation of idempotent writesThe
writeEntryfunction now properly handles idempotent writes by checking if the entry's index is less than or equal to the last index. This prevents duplicate entries and logs an appropriate error message.🧰 Tools
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[warning] 1119-1120: memiavl/db.go#L1119-L1120
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10-18: Good abstraction for version-controlled store loadingThis function provides a clean abstraction for loading stores with version control, which is essential for addressing the version mismatch issue mentioned in the PR objectives.
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[warning] 15-17: app/storeloader.go#L15-L17
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21-37: Well-structured upgrade store loader with version controlThe upgrade store loader correctly handles the different scenarios: using default upgrade loader when version is 0, checking for store upgrades when at the upgrade height, and falling back to max version loading.
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[warning] 21-24: app/storeloader.go#L21-L24
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20-20: Setting TMPDIR is a good practiceSetting the TMPDIR environment variable to a standard location ensures consistent behavior across different development environments and helps prevent issues where temporary directories might be created in unexpected locations.
integration_tests/test_versiondb.py (1)
8-8: Import usage looks good.
No immediate concerns. The neww3_wait_for_new_blocksutility function is correctly imported and used below.app/upgrades.go (4)
20-21: Docstring alignment with return value looks good.
The updated function now returns a boolean to indicate whether the store loader is overridden, matching the new comment.
58-58: Confirm test coverage for store loader logic.
Setting the store loader here is critical, yet lines involvingMaxVersionUpgradeStoreLoadermay lack coverage. Ensure there's a test path that triggers this call under upgrade conditions.🧰 Tools
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[warning] 58-58: app/upgrades.go#L58
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64-64: Early return from upgrade handler.
Returningtruehere is straightforward, but be aware that it could remain untested if no test scenario explicitly checks an upgrade plan with this name. Consider adding or verifying coverage.🧰 Tools
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[warning] 64-65: app/upgrades.go#L64-L65
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69-69: Store loader default path.
Returningfalsehere ensures the default loader is used when the plan name does not match. Confirm there's a test scenario covering this branch.app/app.go (1)
971-974: Initializing qmsVersion is straightforward.
This block correctly falls back to zero ifapp.qmsis not enabled. No issues identified.
| if qmsVersion > 0 { | ||
| // it should not happens since we constraint the loaded iavl version to not exceed the versiondb version, | ||
| // still keep the check for safety. | ||
| iavlVersion := app.LastBlockHeight() | ||
| if qmsVersion < iavlVersion { | ||
| // try to prevent gap being created in versiondb |
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🛠️ Refactor suggestion
Consider more user-friendly handling of version mismatch.
Forcing an exit on mismatch provides immediate safety but may hinder operation in production environments. Logging the discrepancy and offering a guided resolution could improve the troubleshooting experience.
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🧹 Nitpick comments (1)
memiavl/db_test.go (1)
510-570: Well-structured test for write operation idempotencyThis test function methodically verifies that the database reaches the same final state regardless of how the operations are applied (all at once or in stages with reloading), which is essential for ensuring version consistency. The test flow effectively:
- Creates and populates a database
- Closes it and reloads at an intermediate version
- Replays the remaining operations
- Verifies the final state matches the original
There is a minor spelling error on line 550: "intermidiate" should be "intermediate".
- // reload db from disk at an intermidiate version + // reload db from disk at an intermediate version🧰 Tools
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550-550:
intermidiateis a misspelling ofintermediate(misspell)
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memiavl/db_test.go
550-550: intermidiate is a misspelling of intermediate
(misspell)
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🔇 Additional comments (3)
memiavl/db_test.go (3)
502-508: Good addition of tests for both synchronous and asynchronous commit modes!The test function correctly covers both synchronous and asynchronous commit scenarios, which helps ensure the idempotency of write operations in different configurations. This is directly relevant to addressing the version mismatch issue mentioned in the PR objectives.
550-552: Test validates partial loading and replay functionalityThis is a critical part of the test that validates the database's ability to load at a specific target version and correctly handle subsequent operations. This directly addresses the PR's goal of preventing version mismatches by ensuring version-specific loading works correctly.
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550-550:
intermidiateis a misspelling ofintermediate(misspell)
561-562: Excellent verification of state consistency after operationsThe equality check between the original commit info and the commit info after reloading and replaying operations is the key assertion that confirms idempotency. This is precisely what's needed to verify that no version mismatch occurs.
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🧹 Nitpick comments (4)
memiavl/db_test.go (4)
6-6: Remove unnecessary package aliasThe import statement
fmt "fmt"is using an alias that's identical to the package name, which is redundant.- fmt "fmt" + "fmt"
525-539: Optimize memory usage for large test datasetsThe current approach generates all changesets in memory before applying them. For very large tests, this could potentially cause memory pressure. Consider generating changes on-the-fly if this test is expanded to include more extensive datasets.
- var changes [][]*NamedChangeSet - for i := 0; i < 10; i++ { - cs := []*NamedChangeSet{ - { - Name: "test1", - Changeset: ChangeSet{Pairs: mockKVPairs("hello", fmt.Sprintf("world%d", i))}, - }, - { - Name: "test2", - Changeset: ChangeSet{Pairs: mockKVPairs("hello", fmt.Sprintf("world%d", i))}, - }, - } - changes = append(changes, cs) - } - - for _, cs := range changes { - require.NoError(t, db.ApplyChangeSets(cs)) - _, err := db.Commit() - require.NoError(t, err) - } + // Apply changes directly without storing them all in memory + for i := 0; i < 10; i++ { + cs := []*NamedChangeSet{ + { + Name: "test1", + Changeset: ChangeSet{Pairs: mockKVPairs("hello", fmt.Sprintf("world%d", i))}, + }, + { + Name: "test2", + Changeset: ChangeSet{Pairs: mockKVPairs("hello", fmt.Sprintf("world%d", i))}, + }, + } + require.NoError(t, db.ApplyChangeSets(cs)) + _, err := db.Commit() + require.NoError(t, err) + } + + // For replay test, we'll need to regenerate the same changesNote: This suggestion assumes that the changes can be deterministically regenerated for the replay test. If not, then keeping them in memory is necessary.
541-559: Add more descriptive assertion messagesWhile the test uses
require.NoError()to check for errors, adding more descriptive error messages would aid debugging if the test fails. This is especially important for the commit operations which are central to what's being tested.for _, cs := range changes { - require.NoError(t, db.ApplyChangeSets(cs)) + require.NoError(t, db.ApplyChangeSets(cs), "Failed to apply change sets") _, err := db.Commit() - require.NoError(t, err) + require.NoError(t, err, "Failed to commit changes") } // ... for i := 0; i < 5; i++ { - require.NoError(t, db.ApplyChangeSets(changes[i+5])) + require.NoError(t, db.ApplyChangeSets(changes[i+5]), + "Failed to apply change set %d during replay", i+5) _, err := db.Commit() - require.NoError(t, err) + require.NoError(t, err, "Failed to commit changes during replay at step %d", i+5) }
562-562: Enhance the equality assertion with a descriptive messageThe equality check is a critical part of the test that verifies idempotency, but it lacks a descriptive message to help diagnose test failures.
- require.Equal(t, commitInfo, *db.LastCommitInfo()) + require.Equal(t, commitInfo, *db.LastCommitInfo(), + "CommitInfo after replay doesn't match original CommitInfo")
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🔇 Additional comments (3)
memiavl/db_test.go (3)
502-508: Good test coverage for different commit modesThe test function is well-structured and appropriately tests both synchronous and asynchronous commit modes, which provides comprehensive coverage for the idempotent write functionality.
510-570: Well-structured test helper with thorough verificationThe test helper function effectively:
- Sets up the test environment with different commit modes
- Generates and applies a series of changes
- Verifies idempotency by loading an intermediate version and replaying changes
- Confirms that the final commit info matches across different scenarios
This comprehensively tests that database operations are truly idempotent across restarts and partial loads.
513-517:❌ Incorrect review comment
Consider adding error handling for invalid asyncCommitBuffer values
The code sets asyncCommitBuffer to -1 for synchronous commits and 10 for asynchronous commits. While -1 is likely interpreted as "disabled", it would be good to verify that negative values are properly handled in the core implementation.
🏁 Script executed:
#!/bin/bash # Check how negative asyncCommitBuffer values are handled in the implementation rg -A 10 "AsyncCommitBuffer" --type go | grep -v "test"Length of output: 4350
Async Commit Buffer Handling: -1 is Intentional
The current implementation intentionally assigns a value of –1 to denote synchronous commits, as clearly documented in the configuration (see comments in store/config/config.go and store/config/toml.go). The design expects –1 as a valid indicator, with a positive value (e.g., 10) enabling asynchronous commits. There isn’t a case where –1 is considered an error; however, if there’s a possibility of other unexpected negative values (such as –2), you might optionally add validation to reject those. As it stands, the behavior is consistent with the design’s intent.
Likely an incorrect or invalid review comment.
Solution:
👮🏻👮🏻👮🏻 !!!! REFERENCE THE PROBLEM YOUR ARE SOLVING IN THE PR TITLE AND DESCRIBE YOUR SOLUTION HERE !!!! DO NOT FORGET !!!! 👮🏻👮🏻👮🏻
PR Checklist:
make)make test)go fmt)golangci-lint run)go list -json -m all | nancy sleuth)Thank you for your code, it's appreciated! :)
Summary by CodeRabbit
Summary by CodeRabbit
Bug Fixes
Refactor
New Features
Tests