YTDB-510: Fix failing unit tests after Snapshot Isolation implementation by andrii0lomakin · Pull Request #636 · JetBrains/youtrackdb

andrii0lomakin · 2026-02-03T09:54:13Z

Motivation:

The Snapshot Isolation (SI) implementation introduced significant behavioral changes to how record versions and collection positions work. These changes caused multiple unit tests to fail because they relied on assumptions that no longer hold under SI:

Record versions are now derived from transaction timestamps rather than being explicitly managed
Position 0 in each collection is reserved for versioned metadata storage
Sequence operations require proper transactional semantics with deferred cache updates

This PR fixes all failing tests to align with the new SI behavior while maintaining correct test coverage.

Changes:

Test Fixes:

JSONTest: Replace transaction ID-based version assertions with entity.getVersion() calls. Under SI, record versions are derived from transaction timestamps and are not directly accessible at the test level. Return full entities from computeInTx lambdas instead of RIDs to enable proper version assertions.
MultipleDBTest: Increment expected collection positions by 1 to account for the metadata record now stored at position 0.
DBSequenceTest: Use separate transactions for sequence operations to accommodate the new transactional semantics.

Core SI Implementation:

Versioned metadata record: Store collection records count in a metadata record at position 0 (format: 2-byte version + 8-byte count). This is required because different transactions need to see different record counts based on their snapshot.
Record version derivation: Remove recordVersion parameter from createRecord()/updateRecord() methods in StorageCollection. Versions are now derived from atomicOperation.getOperationUnitId() (transaction timestamp).
Transactional sequence removal: Defer sequence cache removal until transaction commits using SessionListener. This ensures rolled-back drop operations preserve the sequence.
AtomicOperationsTable: Track active transactions for visibility decisions.

Code Cleanup:

Remove unused methods: getBinaryVersion(), getSize(), getNextFreePosition(), getActiveTransactions(), etc.
Make LongSerializer.serializeNative()/deserializeNative() static methods
Modernize Java idioms (use Thread.currentThread().threadId(), Locale.of(), transaction.remove())

gemini-code-assist · 2026-02-03T09:55:18Z

Summary of Changes

Hello @andrii0lomakin, 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 introduces significant internal refactoring to the YouTrackDB's core serialization and storage layers. The primary goal is to enhance code clarity, maintainability, and efficiency by standardizing serialization method calls, centralizing collection size management through a new metadata record, and refining transaction-aware operations. It also includes general code cleanup and minor performance optimizations.

Highlights

Serialization Refactoring: The LongSerializer.serializeNative and deserializeNative methods have been refactored to be static, removing the need for LongSerializer.INSTANCE calls across the codebase. This change simplifies usage and improves consistency.
Streamlined Collection Size Tracking: Deprecated methods related to retrieving collection and database sizes (e.g., getSize, getCollectionRecordSizeByName, getCollectionRecordSizeById, getRecordsSize) have been removed from various interfaces and implementations. A new metadata record at position 0 in PaginatedCollectionV2 now stores the records count, centralizing this information.
Metadata Record Handling in PaginatedCollectionV2: The PaginatedCollectionV2 class has been updated to manage a dedicated metadata record at collection position 0. Operations like createRecord, deleteRecord, updateRecord, getEntries, getFirstPosition, getLastPosition, and iteration methods now correctly interact with or bypass this special record.
Transaction and Session Management Improvements: The SequenceLibraryImpl.dropSequence method now uses a SessionListener to ensure that sequence removal from the in-memory cache is synchronized with transaction commit or rollback. Additionally, AbstractStorage now uses transaction.remove() instead of transaction.set(null) for thread-local transaction cleanup and Thread.currentThread().threadId() for logging.
Code Cleanup and Minor Optimizations: IDE warnings have been suppressed with @SuppressWarnings("unused") and @SuppressWarnings("resource") annotations. Bit shift operators (<< 10) are now used for page size calculations instead of multiplication (* 1024) for minor performance optimization. Locale.of() is used instead of new Locale() for modern Java API usage.

Changelog

core/src/main/java/com/jetbrains/youtrackdb/internal/common/serialization/types/DateTimeSerializer.java
- Updated to use static LongSerializer methods for serialization and deserialization.
core/src/main/java/com/jetbrains/youtrackdb/internal/common/serialization/types/LongSerializer.java
- The serializeNative and deserializeNative methods are now static.
core/src/main/java/com/jetbrains/youtrackdb/internal/common/serialization/types/UUIDSerializer.java
- Updated to use static LongSerializer methods for UUID serialization and deserialization.
core/src/main/java/com/jetbrains/youtrackdb/internal/core/command/script/ScriptDocumentDatabaseWrapper.java
- Added @SuppressWarnings("unused") to the class and executeCommand method.
- Removed the getSize() method.
core/src/main/java/com/jetbrains/youtrackdb/internal/core/db/DatabaseSessionEmbedded.java
- Removed getCollectionRecordSizeByName, getCollectionRecordSizeById, and getSize methods.
core/src/main/java/com/jetbrains/youtrackdb/internal/core/db/DatabaseSessionInternal.java
- Removed getCollectionRecordSizeByName, getCollectionRecordSizeById, and getSize methods from the interface.
core/src/main/java/com/jetbrains/youtrackdb/internal/core/gremlin/YTDBGraphFactory.java
- Removed a logger.error call in unregisterYTDBInstance.
- Added @SuppressWarnings("resource") to a storagePathYTDBMap.compute call.
core/src/main/java/com/jetbrains/youtrackdb/internal/core/metadata/schema/SchemaClassImpl.java
- Modified getSuperClassesNames and fromStream methods to no longer require a DatabaseSessionInternal parameter.
- Removed getSize, getIndexedProperties, and truncateCollectionInternal methods.
core/src/main/java/com/jetbrains/youtrackdb/internal/core/metadata/schema/SchemaClassProxy.java
- Updated getSuperClassesNames to reflect the change in SchemaClassImpl.
core/src/main/java/com/jetbrains/youtrackdb/internal/core/metadata/schema/SchemaImmutableClass.java
- Updated constructor to reflect the change in SchemaClassImpl.getSuperClassesNames.
core/src/main/java/com/jetbrains/youtrackdb/internal/core/metadata/schema/SchemaShared.java
- Updated fromStream to reflect the change in SchemaClassImpl.fromStream.
core/src/main/java/com/jetbrains/youtrackdb/internal/core/metadata/sequence/SequenceLibraryImpl.java
- Modified dropSequence to use a SessionListener for removing sequences from the cache after transaction commit or rollback, improving consistency.
- Removed NeedRetryException import.
core/src/main/java/com/jetbrains/youtrackdb/internal/core/sql/executor/FetchFromStorageMetadataStep.java
- Removed setting the 'size' property in the result.
core/src/main/java/com/jetbrains/youtrackdb/internal/core/storage/Storage.java
- Removed getCollectionRecordsSizeById, getCollectionRecordsSizeByName, and getSize methods from the interface.
core/src/main/java/com/jetbrains/youtrackdb/internal/core/storage/StorageCollection.java
- Removed the recordVersion parameter from createRecord and updateRecord method signatures.
- Removed getNextFreePosition, getRecordsSize, compression, and getBinaryVersion methods.
core/src/main/java/com/jetbrains/youtrackdb/internal/core/storage/cache/local/WOWCache.java
- Updated to use static LongSerializer methods.
core/src/main/java/com/jetbrains/youtrackdb/internal/core/storage/collection/v2/PaginatedCollectionStateV2.java
- Removed setSize, getSize, setRecordsSize, getRecordsSize, setFreeListPage, and getFreeListPage methods, as collection size is now managed differently.
core/src/main/java/com/jetbrains/youtrackdb/internal/core/storage/collection/v2/PaginatedCollectionV2.java
- Introduced a metadata record at METADATA_RECORD_POSITION (position 0) to store collection-level information, specifically the records count.
- Updated createRecord, deleteRecord, updateRecord, updateRecordVersion, getPhysicalPosition, exists, getEntries, getFirstPosition, getLastPosition, higherPositions, and nextPage to correctly handle and bypass the new metadata record.
- Removed getBinaryVersion and compression methods.
- Renamed initCusterState to initCollectionState.
- Modified updateCollectionState to update the records count in the new metadata record.
core/src/main/java/com/jetbrains/youtrackdb/internal/core/storage/config/CollectionBasedStorageConfiguration.java
- Changed iNetworkVersion >= Integer.MAX_VALUE to iNetworkVersion == Integer.MAX_VALUE for network version checks.
- Hardcoded durableInNonTxMode to true and apiVersion to 1 with comments for backward compatibility.
- Changed new Locale(getLocaleLanguage(), getLocaleCountry()) to Locale.of(getLocaleLanguage(), getLocaleCountry()).
- Updated storeProperty to reflect the new createRecord and updateRecord method signatures.
core/src/main/java/com/jetbrains/youtrackdb/internal/core/storage/disk/DiskStorage.java
- Updated to use static LongSerializer methods for page data serialization.
core/src/main/java/com/jetbrains/youtrackdb/internal/core/storage/impl/local/AbstractStorage.java
- Added a closeIfPossible() helper method and integrated it into create() and close() for more robust session management.
- Changed transaction.set(null) to transaction.remove() for thread-local transaction cleanup.
- Updated logging to use Thread.currentThread().threadId() instead of getId().
- Removed getCollectionRecordsSizeById, getCollectionRecordsSizeByName, getIndexValue, doGetIndexValue, and getSize methods.
- Changed callIndexEngine to return void instead of a generic type T.
core/src/main/java/com/jetbrains/youtrackdb/internal/core/storage/impl/local/paginated/base/DurablePage.java
- Changed MAX_PAGE_SIZE_BYTES calculation from * 1024 to << 10 for bitwise optimization.
- Updated to use static LongSerializer methods for log sequence number handling.
core/src/main/java/com/jetbrains/youtrackdb/internal/core/storage/impl/local/paginated/wal/WALPageChangesPortion.java
- Changed PAGE_SIZE calculation from * 1024 to << 10.
- Updated to use static LongSerializer methods for setting and getting long values.
core/src/main/java/com/jetbrains/youtrackdb/internal/core/storage/index/sbtree/multivalue/v2/MultiValueEntrySerializer.java
- Updated to use static LongSerializer methods for serializing and deserializing MultiValueEntry components.
core/src/main/java/com/jetbrains/youtrackdb/internal/core/storage/index/sbtree/singlevalue/v3/BTree.java
- Updated to use static LongSerializer methods for serializing and deserializing record IDs within the B-tree.
core/src/test/java/com/jetbrains/youtrackdb/internal/common/serialization/types/LongSerializerTest.java
- Updated tests to call the now static LongSerializer.serializeNative method directly.
core/src/test/java/com/jetbrains/youtrackdb/internal/core/PostponedEngineStartTest.java
- Removed mock implementations for getCollectionRecordsSizeById, getCollectionRecordsSizeByName, and getSize methods, aligning with their removal from interfaces.
core/src/test/java/com/jetbrains/youtrackdb/internal/core/db/DeepLinkedDocumentSaveTest.java
- Removed FrontendTransaction import and related assertions, simplifying transaction testing.
core/src/test/java/com/jetbrains/youtrackdb/internal/core/metadata/sequence/DBSequenceTest.java
- Added an additional db.commit() before dropping a sequence to ensure proper transaction state.
core/src/test/java/com/jetbrains/youtrackdb/internal/core/record/impl/DocumentSchemafullSerializationTest.java
- Removed RecordId import.
- Updated testSimpleSerialization to use an actual entity for RECORDID_FIELD and adjusted assertions for property retrieval.
core/src/test/java/com/jetbrains/youtrackdb/internal/core/storage/collection/LocalPaginatedCollectionAbstract.java
- Removed the recordVersion parameter from createRecord and updateRecord calls in various tests.
- Changed array size calculation from 2 * 65536 + 100 to (2 << 16) + 100.
core/src/test/java/com/jetbrains/youtrackdb/internal/core/storage/index/hashindex/local/cache/WOWCacheTestIT.java
- Updated to use static LongSerializer methods in assertions.
tests/src/test/java/com/jetbrains/youtrackdb/auto/JSONTest.java
- Removed AtomicLong import.
- Updated JSON serialization tests to reflect changes in how transaction IDs and record versions are handled, and adjusted assertions for getProperty type casting.
- Modified testEmbeddedQuotes2 and testEmbeddedQuotes6 to use Map<String, String> for property retrieval.
tests/src/test/java/com/jetbrains/youtrackdb/auto/MultipleDBTest.java
- Removed redundant javadoc comments.
- Adjusted assertion for getCollectionPosition() from j to j + 1.

Activity

The pull request was initiated by andrii0lomakin with the title "YTDB-510: Fix test and suppress IDE warning", indicating an intent to address specific issues and improve code quality.
The changes involve extensive refactoring across core components, suggesting a deeper architectural improvement effort beyond the stated title, aiming for cleaner and more efficient code.
The provided PR body is a template, so no specific human-written activity or discussion details are available within the context.

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Code Review

This pull request introduces a significant and well-executed refactoring of the storage layer, primarily focused on improving MVCC behavior. The introduction of a versioned metadata record within each collection to track statistics like record count is a solid design choice. The simplification of the StorageCollection API by removing the explicit recordVersion parameter and other methods is a great improvement in code clarity.

I particularly appreciate the fix in SequenceLibraryImpl to make dropSequence transaction-safe by using a SessionListener. This resolves a potential correctness issue.

I've identified a couple of minor potential issues related to Java version compatibility that should be considered. Overall, this is a high-quality set of changes that improves the robustness and design of the storage system.

gemini-code-assist · 2026-02-03T09:58:17Z

...m/jetbrains/youtrackdb/internal/core/storage/config/CollectionBasedStorageConfiguration.java

        locale = Locale.getDefault();
      } else {
-        locale = new Locale(getLocaleLanguage(), getLocaleCountry());
+        locale = Locale.of(getLocaleLanguage(), getLocaleCountry());


The Locale.of() factory method was introduced in Java 9. If this project needs to maintain compatibility with Java 8, this change will cause a compilation error. The constructor new Locale(...) should be used instead for older Java versions.

Suggested change

locale = Locale.of(getLocaleLanguage(), getLocaleCountry());

locale = new Locale(getLocaleLanguage(), getLocaleCountry());

gemini-code-assist · 2026-02-03T09:58:17Z

...src/main/java/com/jetbrains/youtrackdb/internal/core/storage/impl/local/AbstractStorage.java

                this,
                "%d Committed transaction %d on database '%s' (result=%s)",
-                logger, Thread.currentThread().getId(),
+                logger, Thread.currentThread().threadId(),


The use of Thread.currentThread().threadId() was introduced in Java 19. If this project is intended to be compatible with Java versions older than 19, this will introduce a compilation error. For broader compatibility, it's safer to use Thread.currentThread().getId().

Suggested change

logger, Thread.currentThread().threadId(),

logger, Thread.currentThread().getId(),

claude · 2026-02-03T11:46:01Z

.../main/java/com/jetbrains/youtrackdb/internal/core/metadata/sequence/SequenceLibraryImpl.java

+          public void onAfterTxCommit(Transaction transaction,
+              @Nullable Map<RID, RID> ridMapping) {
+            sequences.remove(normalizeName(iName));
+            session.unregisterListener(this);


Potential Memory Leak from Listener Registration

The listener is registered after the delete operation but there's no try-finally block to ensure cleanup if an exception occurs before commit. This could lead to accumulated listeners if transactions repeatedly fail.

Consider wrapping with try-catch to ensure listener cleanup on exceptions.

github-actions · 2026-02-03T11:50:48Z

Qodana for JVM

It seems all right 👌

No new problems were found according to the checks applied

@@ Code coverage @@
+ 55% total lines covered
118663 lines analyzed, 66247 lines covered
+ 73% fresh lines covered
1252 lines analyzed, 922 lines covered
# Calculated according to the filters of your coverage tool

💡 Qodana analysis was run in the pull request mode: only the changed files were checked
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Under snapshot isolation, all read operations (countClass, countCollectionElements, countRecords, index.size, index.getRids, index.stream, session.query, session.execute) now require an active transaction. This commit wraps bare read operations that occurred outside transaction boundaries in begin/rollback blocks across 31 test files in the tests module. Affected test files and patterns: - CRUDTest, CRUDInheritanceTest, CRUDDocumentPhysicalTest: countClass - SchemaTest: countRecords - FrontendTransactionImplTest: countCollectionElements, countClass - SQLDeleteTest, SQLSelectTest, SQLUpdateTest: countClass - TransactionAtomicTest, TransactionConsistencyTest: countCollectionElements - GEOTest, ConcurrentCommandAndOpenTest: countClass, execute - TruncateClassTest, SchemaPropertyIndexTest: index.size - DefaultValuesTrivialTest, ByteArrayKeyTest, DateIndexTest: index.getRids - ClassIndexManagerTest: index.size, index.getRids - CollectionIndexTest: index.size - LinkBagIndexTest, LinkListIndexTest, LinkMapIndexTest, LinkSetIndexTest: index.size - IndexTxAware{OneValue,MultiValue}Get{,Entries,Values}Test (6 files): index.getRids - IndexTest: index.size, index.getRids, index.stream, countClass - LinkBagTest: LinkBag constructor requires active transaction Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

…agerTest and others Wrap index.size(), index.getRids(), and index.stream() calls that occur outside transaction boundaries with begin/rollback blocks in: - ClassIndexManagerTest: 55+ methods fixed covering all CRUD, composite index, collection composite, and two-collection composite test methods - IndexTest: testTransactionUniqueIndexTestTwo, testTransactionUniqueIndexTestWithDotNameTwo, testIndexRebuildDuringDetachAllNonProxiedObjectDelete, testIndexEntries - SchemaPropertyIndexTest: testIndexingCompositeRIDAndOthersInTx - MapIndexTest: testIndexMapRemove, testIndexMapRemoveInTx Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

- CRUDTest.testCreate, CRUDTest.testCreateClass: wrap countClass in tx - CRUDInheritanceTest.deleteFirst: wrap countClass in tx - CRUDDocumentPhysicalTest.testDoubleChanges: wrap index.getRids in tx - IndexTest: use db session (not this.session) for index.size in testTransactionUniqueIndexTestOne/WithDotNameOne since db is the session with the active transaction - MultipleDBTest: revert collection position assertion from j+1 back to j, as positions start from 0 after rebase onto develop Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

…sitions - CRUDTest: wrap countClass and countCollectionElements in transactions for checkLazyLoadingOff and testSaveMultiCircular methods - CRUDDocumentPhysicalTest: wrap index.getRids in transaction for testMultiValues method - MultipleDBTest: revert collection position from j+1 to j since positions start from 0 after rebase onto develop Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

…ions, and add MapIndexDeleteTest Remaining "no active transaction" fixes: - CRUDTest: wrap countClass/countCollectionElements in testCreate, testCreateClass, checkLazyLoadingOff, testSaveMultiCircular - CRUDInheritanceTest: wrap countClass in deleteFirst - CRUDDocumentPhysicalTest: wrap index.getRids in testMultiValues and testDoubleChanges - IndexTest: use db session (not this.session) for index.size in testTransactionUniqueIndexTestOne/WithDotNameOne since db is the session with the active transaction MultipleDBTest: revert collection position from j+1 to j since positions start from 0 after rebase onto develop. Add MapIndexDeleteTest in core module to verify that deleting records with EMBEDDEDMAP properties correctly cleans up map index entries (both "by key" and "by value" indexes). Tests pass in the core module. The tests module MapIndexTest still fails due to a deep storage-level issue where multi-value B-tree index removals don't persist across session boundaries in a shared database with many schema classes. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

…RUDDocumentPhysicalTest - CRUDTest.deleteFirst: wrap countClass in transaction - CRUDDocumentPhysicalTest.testMultiValues: wrap index.getRids in transaction after delete+commit All "no active transaction" errors are now resolved. Remaining 14 failures in MapIndexTest are caused by a deep storage-level issue where multi-value B-tree map index removals don't persist across session boundaries in the shared test database. This needs further investigation in the storage engine WAL/atomic operation layer. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Add testMapIndexDeleteWithHeavySchemaAndSessionCloseReopen that creates 20 additional schema classes with indexes and data before testing map index delete behavior. This test passes, confirming that map index deletion works correctly even with a complex schema setup. The remaining MapIndexTest failures in the tests module appear to be caused by a specific interaction in the shared TestNG test database that cannot be reproduced in isolated core module tests. The production code path for map index deletion (ClassIndexManager .processIndexOnDelete -> deleteIndexKey -> index.remove -> doRemove) correctly extracts map keys/values, adds REMOVE operations to the transaction, and the commit applies them to the physical B-tree. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

… in testIndexMapAddItemTxRollback The test left a verification transaction open (missing session.rollback()), causing the afterMethod's session.begin() to create a nested transaction. The subsequent commit() only decremented txStartCounter without actually committing, silently discarding the delete operations and leaving stale map index entries. This cascaded to all subsequent tests. - Add missing session.rollback() in testIndexMapAddItemTxRollback - Make afterMethod defensive: rollback any active transaction before cleanup - Add regression test for nested transaction index cleanup behavior Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

…ss transaction boundaries RecordIteratorCollection.initStorageIterator() captured the atomic operation from the current transaction at initialization time and passed it as a fixed value to AbstractStorage.browseCollection(). When forEachInTx() committed and began new transactions during iteration, the captured atomic operation became deactivated, causing "Atomic operation is not active and can not be used" errors on subsequent iterator.hasNext() calls. The fix adds a Supplier<AtomicOperation> overload to AbstractStorage.browseCollection() so the storage page iterator dynamically resolves the atomic operation on each page load. RecordIteratorCollection now uses this overload, obtaining the atomic operation from the session's current active transaction each time a new page is needed. This fixes CRUDDocumentPhysicalTest.testUpdateLazyDirtyPropagation which uses forEachInTx with a browseCollection iterator across multiple commit/begin cycles. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

…uring test runs The test watchdog was incorrectly killing the JVM because testProfileStrategyCallbackSideEffect (from TinkerPop's ProfileTest) was tracked as "running" for 15+ minutes despite having already completed. Root cause: TinkerPop's Gremlin test suite runner calls testStarted() for tests that are then skipped via assumption failures, but does not always invoke testFinished() to clean up. This leaves stale entries in the runningTests map, causing the watchdog to interpret them as stuck tests and terminate the JVM via System.exit(1). Fix: Override testAssumptionFailure() and testIgnored() in JUnitTestListener to remove tests from the runningTests tracking map. This ensures skipped and assumption-failed tests don't leak entries that trigger false-positive watchdog timeouts. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Replace GitHub API-based commit enumeration with local git merge-base approach to accurately identify only PR-specific commits. This fixes false positives when the PR branch contains commits from other YTDB issues that were merged from develop with different SHAs. Changes: - Use execFileSync instead of execSync to prevent shell injection - Validate branch names against an allowlist pattern - Use NUL byte field separators for robust git log parsing - Pin checkout to PR head SHA for correct commit range detection - Add error handling for git commands with clear error messages Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

…for SI Under snapshot isolation, record versions are transaction timestamps instead of small sequential numbers. Update all version assertions: - Replace hardcoded `recordVersion = 2` with `assertTrue(version > 0)` - Replace `newRecordVersion = 3` with captured initial versions and assertNotEquals to verify versions change on update - Track per-position initial versions in testUpdateMany* tests to verify updated records get new versions while unchanged records retain their original versions Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Two checksum validation tests failed because: 1. Under SI, page 0 of .pcl files is now a state/metadata page, not a data page. Corruption positions are adjusted to target data pages (page 1+) instead. 2. The double-write log silently recovers corrupted pages from its backup copies. Disable double-write log in the two read-only checksum tests so corruption is actually detected. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

LocalPaginatedStorageRestoreFromWALIT.testSimpleRestore fails under concurrent operations with "Collection position mismatch" - the collection position embedded in serialized record data gets out of sync with the position map during concurrent writes. The test passes with single thread but fails with 8 threads, confirming this is a concurrency bug in PaginatedCollectionV2. Also add ConcurrentModificationException handling to restore list state when transactions are rolled back due to version conflicts. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

The fork-point approach still includes cherry-picked commits that have different SHAs than on develop. Add logic to skip commits that reference a different YTDB issue prefix, since these are legitimate commits from other features that ended up in the branch history. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

github-actions · 2026-02-16T03:18:41Z

Coverage Report

Overall Project	37.37% `-1.23%`	🍏
Files changed	38.15%	🍏

Module	Coverage
YouTrackDB Core	55.9% `-0.91%`	🍏
YouTrackDB Core	18.57% `-1.56%`	🍏

Files

Module	File	Coverage
YouTrackDB Core	Storage.java	100%	🍏
	LinkBagDeleteSerializationOperation.java	100%	🍏
	V1IndexEngine.java	100%	🍏
	PaginatedCollectionStateV2.java	100%	🍏
	PaginatedCollection.java	100%	🍏
	IndexUnique.java	100%	🍏
	IndexNotUnique.java	100%	🍏
	RecordIteratorCollection.java	98.46%	🍏
	FreeSpaceMap.java	96.55%	🍏
	StorageCollection.java	95.56%	🍏
	WALPageChangesPortion.java	95.39%	🍏
	LongSerializer.java	93.77%	🍏
	ClassIndexFinder.java	93.26%	🍏
	DateTimeSerializer.java	92.79%	🍏
	SpliteratorForward.java	92.09%	🍏
	DatabaseRecordWalker.java	91.39%	🍏
	IndexSearchDescriptor.java	90.98%	🍏
	SpliteratorForward.java	90.97%	🍏
	SpliteratorBackward.java	90%	🍏
	SequenceLibraryImpl.java	89.24% `-1.42%`	🍏
	CollectionPage.java	85.4%	🍏
	DiskStorage.java	82.92%	🍏
	SchemaShared.java	82.36%	🍏
	AtomicOperationsManager.java	81.92% `-2.82%`	🍏
	SelectExecutionPlanner.java	80.57%	🍏
	FetchFromStorageMetadataStep.java	80.23%	🍏
	IndexManagerAbstract.java	80.23%	🍏
	AtomicOperationBinaryTracking.java	80.21% `-5.45%`	🍏
	SharedContext.java	80.17%	🍏
	LinkCollectionsBTreeManagerShared.java	79.19% `-2.8%`	🍏
	YTDBGraphTraversalSource.java	79.17% `-20.83%`	🍏
	AtomicOperationsTable.java	78.92% `-7.91%`	🍏
	Indexes.java	78.57%	🍏
	AbstractLinkBag.java	77.94%	🍏
	CollectionPositionMapV2.java	77.4%	🍏
	DurablePage.java	77.05%	🍏
	YTDBGraphFactory.java	76.74%	🍏
	YTDBGraphTraversal.java	76.35% `-23.65%`	🍏
	RecordSerializerBinaryV1.java	74.63%	🍏
	SchemaEmbedded.java	74.13% `-0.18%`	🍏
	SchemaClassImpl.java	73.67%	🍏
	DefaultIndexFactory.java	73.4%	🍏
	CollectionPositionMapBucket.java	70.8% `-1.2%`	🍏
	DatabaseExport.java	70.64%	🍏
	BinaryComparatorV0.java	70.59% `-0.06%`	🍏
	DatabaseImport.java	69.6%	🍏
	BTreeBasedLinkBag.java	69.33%	🍏
	PaginatedCollectionV2.java	68.44% `-10.23%`	🍏
	IndexManagerEmbedded.java	67.98%	🍏
	BTree.java	67.06%	🍏
	CountFromIndexStep.java	67.06%	🍏
	Index.java	66.99%	🍏
	SchemaClassEmbedded.java	66.35%	🍏
	BTreeMultiValueIndexEngine.java	65.7% `-4.37%`	🍏
	DefaultYTDBGraphTraversal.java	65.52% `-34.48%`	🍏
	EntityImpl.java	65.47%	🍏
	FrontendTransactionImpl.java	64.71%	🍏
	FetchFromIndexStep.java	63.16% `-0.85%`	🍏
	RecordAbstract.java	61.99%	🍏
	IndexAbstract.java	61.95% `-5.65%`	🍏
	SchemaImmutableClass.java	61.69%	🍏
	StatementCache.java	61.33% `-5.86%`	🍏
	CollectionBasedStorageConfiguration.java	61.27% `-6.74%`	🍏
	DateHelper.java	60.24%	🍏
	DatabaseSessionEmbedded.java	59.46% `-0.31%`	🍏
	PeriodicFuzzyCheckpoint.java	57.89%	🍏
	SharedLinkBagBTree.java	57.26%	🍏
	SQLTruncateClassStatement.java	57.1%	🍏
	EmbeddedLinkBag.java	57.05%	🍏
	WOWCache.java	56.76% `-0.03%`	🍏
	GraphRepair.java	56.26%	🍏
	CountFromClassStep.java	56.18%	🍏
	CurrentStorageComponentsFactory.java	55.56%	🍏
	UUIDSerializer.java	55.19% `-2.6%`	🍏
	SchemaClassProxy.java	54.95%	🍏
	SQLWhereClause.java	54.5%	🍏
	JSONSerializerJackson.java	52.66%	🍏
	IndexMultiValues.java	51.42% `-5.14%`	🍏
	BTreeSingleValueIndexEngine.java	51.27% `-9.63%`	🍏
	AbstractStorage.java	51.09% `-2.56%`	🍏
	IndexRebuildOutputListener.java	50.7%	🍏
	DirectMemoryStorage.java	44.83%	🍏
	SQLDropClassStatement.java	43.01%	🍏
	YouTrackDBListenerAbstract.java	42.86%	🍏
	IndexOneValue.java	42.51% `-3.46%`	🍏
	DatabaseCompare.java	41.34% `-0.64%`	🍏
	ConcurrentModificationException.java	41.04% `-5.66%`	🍏
	IsolatedLinkBagBTreeImpl.java	38.84%	🍏
	SQLFilterCondition.java	22.01% `-1.94%`	🍏
	RawBuffer.java	15.58%	🍏
	PhysicalPosition.java	6.61% `-15.42%`	🍏
	MultiValueEntrySerializer.java	4.5% `-8.11%`	🍏
	__.java	2.39% `-97.61%`	🍏
	ScriptDocumentDatabaseWrapper.java	0%	🍏
	CommandExecutorScript.java	0% `-6.65%`	🍏
	SpliteratorBackward.java	0%	🍏
	GQLParser.java	0%	🍏
	GQLBaseListener.java	0%	🍏
	GQLLexer.java	0%	🍏
	GQLBaseVisitor.java	0%	🍏
	RecordMetadata.java	0% `-13.33%`	🍏
	RemoteIndexEngine.java	0%	🍏
	TreeInternal.java	0%	🍏
	RecordVersionHelper.java	0% `-22.81%`	🍏
	SQLTarget.java	0% `-0.37%`	🍏
	DatabasePoolAbstract.java	0%	🍏
	RecreateIndexesTask.java	0% `-1.52%`	🍏
YouTrackDB Core	Storage.java	100%	🍏
	V1IndexEngine.java	100%	🍏
	PaginatedCollectionStateV2.java	100%	🍏
	StorageCollection.java	95.56%	🍏
	SpliteratorForward.java	90.65%	🍏
	FreeSpaceMap.java	82.33%	🍏
	RecordIteratorCollection.java	75%	🍏
	Indexes.java	73.63%	🍏
	IndexUnique.java	72.09%	🍏
	AtomicOperationsManager.java	68.54% `-6.1%`	🍏
	WALPageChangesPortion.java	67.59%	🍏
	AtomicOperationBinaryTracking.java	66.27% `-8.33%`	🍏
	AtomicOperationsTable.java	63.24% `-11.59%`	🍏
	SharedContext.java	61.87%	🍏
	CollectionPositionMapBucket.java	57.8% `-3.8%`	🍏
	RecordSerializerBinaryV1.java	55.97% `-0.12%`	🍏
	CurrentStorageComponentsFactory.java	55.56%	🍏
	IndexManagerAbstract.java	54.25%	🍏
	DurablePage.java	52.75% `-0.27%`	🍏
	AbstractLinkBag.java	52.52%	🍏
	StatementCache.java	51.56% `-5.86%`	🍏
	DefaultIndexFactory.java	51.23%	🍏
	CollectionPositionMapV2.java	50% `-1.1%`	🍏
	PaginatedCollectionV2.java	48.86% `-20.46%`	🍏
	FrontendTransactionImpl.java	47.3%	🍏
	CollectionPage.java	46.44%	🍏
	SchemaShared.java	46.08% `-0.87%`	🍏
	YouTrackDBListenerAbstract.java	42.86%	🍏
	RecordAbstract.java	41.97% `-0.36%`	🍏
	SchemaImmutableClass.java	41.83%	🍏
	WOWCache.java	38.77% `-0.03%`	🍏
	FetchFromIndexStep.java	36.79% `-3.49%`	🍏
	IndexSearchDescriptor.java	34.28% `-1.03%`	🍏
	SchemaClassImpl.java	33.78% `-1.8%`	🍏
	SelectExecutionPlanner.java	33.65% `-0.07%`	🍏
	IndexManagerEmbedded.java	33.43% `-0.3%`	🍏
	CollectionBasedStorageConfiguration.java	32.62% `-10.43%`	🍏
	PeriodicFuzzyCheckpoint.java	31.58%	🍏
	SchemaEmbedded.java	30.69% `-0.18%`	🍏
	YTDBGraphFactory.java	30.21%	🍏
	IndexOneValue.java	28.81% `-4.23%`	🍏
	DatabaseSessionEmbedded.java	27.06% `-0.79%`	🍏
	AbstractStorage.java	26.39% `-5.39%`	🍏
	EntityImpl.java	25.48%	🍏
	PaginatedCollection.java	25%	🍏
	BTreeSingleValueIndexEngine.java	24.93% `-18.98%`	🍏
	IndexAbstract.java	22.74% `-10.08%`	🍏
	IndexRebuildOutputListener.java	22.33%	🍏
	BTree.java	22.04% `-2.12%`	🍏
	EmbeddedLinkBag.java	20.81%	🍏
	SchemaClassEmbedded.java	18.82% `-2.35%`	🍏
	LinkCollectionsBTreeManagerShared.java	18.63% `-4.97%`	🍏
	RawBuffer.java	15.58%	🍏
	SQLWhereClause.java	15.38%	🍏
	DiskStorage.java	15.06% `-2.54%`	🍏
	LongSerializer.java	13.15% `-1.73%`	🍏
	SequenceLibraryImpl.java	11.61% `-13.03%`	🍏
	SchemaClassProxy.java	9.39% `-0.33%`	🍏
	DateTimeSerializer.java	9.01% `-9.01%`	🍏
	PhysicalPosition.java	6.61% `-15.42%`	🍏
	MultiValueEntrySerializer.java	4.5% `-8.11%`	🍏
	SharedLinkBagBTree.java	2.72%	🍏
	BinaryComparatorV0.java	0.08% `-0.06%`	🍏
	BTreeBasedLinkBag.java	0% `-2.15%`	🍏
	ScriptDocumentDatabaseWrapper.java	0%	🍏
	CommandExecutorScript.java	0% `-6.65%`	🍏
	IsolatedLinkBagBTreeImpl.java	0% `-2.89%`	🍏
	SpliteratorForward.java	0%	🍏
	SpliteratorBackward.java	0%	🍏
	JSONSerializerJackson.java	0% `-0.2%`	🍏
	DateHelper.java	0%	🍏
	YTDBGraphTraversal.java	0%	🍏
	YTDBGraphTraversalSource.java	0%	🍏
	__.java	0%	🍏
	DefaultYTDBGraphTraversal.java	0%	🍏
	DirectMemoryStorage.java	0%	🍏
	ConcurrentModificationException.java	0% `-8.49%`	🍏
	GQLParser.java	0%	🍏
	GQLBaseListener.java	0%	🍏
	GQLLexer.java	0%	🍏
	GQLBaseVisitor.java	0%	🍏
	RecordMetadata.java	0% `-13.33%`	🍏
	BTreeMultiValueIndexEngine.java	0% `-19.34%`	🍏
	SpliteratorBackward.java	0% `-7.86%`	🍏
	SQLTruncateClassStatement.java	0% `-7.24%`	🍏
	SQLDropClassStatement.java	0% `-6.29%`	🍏
	LinkBagDeleteSerializationOperation.java	0% `-41.67%`	🍏
	ClassIndexFinder.java	0% `-0.65%`	🍏
	UUIDSerializer.java	0% `-5.19%`	🍏
	RemoteIndexEngine.java	0%	🍏
	CountFromIndexStep.java	0% `-14.12%`	🍏
	CountFromClassStep.java	0% `-14.61%`	🍏
	FetchFromStorageMetadataStep.java	0% `-11.3%`	🍏
	TreeInternal.java	0%	🍏
	RecordVersionHelper.java	0% `-22.81%`	🍏
	SQLFilterCondition.java	0% `-1.94%`	🍏
	SQLTarget.java	0% `-0.37%`	🍏
	DatabasePoolAbstract.java	0%	🍏
	DatabaseRecordWalker.java	0% `-5.62%`	🍏
	DatabaseImport.java	0% `-0.17%`	🍏
	GraphRepair.java	0% `-0.44%`	🍏
	DatabaseExport.java	0% `-0.28%`	🍏
	DatabaseCompare.java	0% `-6.02%`	🍏
	RecreateIndexesTask.java	0% `-1.52%`	🍏
	IndexNotUnique.java	0%	🍏
	IndexMultiValues.java	0% `-13.79%`	🍏
	Index.java	0%	🍏

Apply IntelliJ code style formatting to fix IncorrectFormatting findings reported by Qodana scan. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Convert 7 single-statement block lambdas to expression lambdas in LocalPaginatedCollectionAbstract.java. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Remove 7 redundant casts where the expression already returns the target type. Also remove unused imports that became unnecessary. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Replace 5 redundant explicit variable type declarations with var in FrontendTransactionImplTest and MapIndexDeleteTest. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

@SuppressWarnings

- Add final modifier to transactionsTracker field - Remove redundant @SuppressWarnings in StorageBackupTest - Use Long.compare() in RecordVersionHelper - Remove empty if-body and unused variable in DatabaseExport - Remove redundant throws IOException from 3 methods - Delegate to existing static method in LongSerializer - Replace ignored result with assertion in AtomicOperationsTableTest Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

- Rename currentTs to currentTimestamp in AtomicOperationsTable - Fix 'rolledback' to 'rolled-back' in comment - Fix 'Userr' typo in TransactionTest - Fix 'cerseRecord' to 'cerseiRecord' in JSONTest - Add noinspection for valid 'anyYtdbPrefixRegex' identifier Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Convert 6 ExecutorService usages to try-with-resources in AtomicOperationsTableTest, removing explicit shutdown() calls. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

- Fix grammar in MapIndexDeleteTest and AtomicOperationsTableTest - Remove always-true 'useCache' param from readIntProperty - Remove always-true 'iStrictSQL' param from getEscapedName - Add assertion on 'docs' collection in DeepLinkedDocumentSaveTest Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

@SuppressWarnings

…(Qodana) - Remove unused variables, methods, and parameters across 6 files - Add @SuppressWarnings("unused") to 18 Storage.java interface methods that are used only via implementation classes - Add @SuppressWarnings("unused") to 5 StorageConfiguration.java interface methods with unused atomicOperation parameters - Add @SuppressWarnings("unused") to RecordMetadata class and AtomicOperation.isActive() method Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

…suggestions Add 877 findings to the Qodana baseline: - 866 findings in generated files (Gremlin annotations, GQL parser) that cannot be fixed since the files are auto-generated - 9 DuplicatedCode findings in production code (refactoring risk) - 2 ExtractMethodRecommender findings (code style suggestions) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Add core/src/main/generated to Qodana exclusions to prevent auto-generated files (Gremlin annotations, GQL parser) from producing inspection findings that cannot be fixed in code. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

- Remove 3 redundant throws IOException declarations - Rename anyYtdbPrefixRegex to anyPrefixRegex to fix spelling - Remove 2 unused methods (AtomicOperationsManager, FetchFromStorageMetadataStep) - Suppress unused warning on Storage.getRecordMetadata() interface method Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

andrii0lomakin self-assigned this Feb 3, 2026

andrii0lomakin changed the title ~~YTDB-510: Fix test and suppress IDE warning~~ YTDB-510: Fix failing unit tests after Snapshot Isolation implementation Feb 3, 2026

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andrii0lomakin force-pushed the ytdb-344-records-si branch from 5586222 to fd798c4 Compare February 3, 2026 10:49

andrii0lomakin force-pushed the ytdb-510-fix-failing-unit-tests branch from 75fcc6e to 6316931 Compare February 3, 2026 11:43

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andrii0lomakin force-pushed the ytdb-344-records-si branch from dbf4cfa to 14a2239 Compare February 3, 2026 17:03

andrii0lomakin force-pushed the ytdb-510-fix-failing-unit-tests branch from b1183d4 to 0ffc477 Compare February 3, 2026 17:10

andrii0lomakin marked this pull request as draft February 12, 2026 09:22

andrii0lomakin force-pushed the ytdb-510-fix-failing-unit-tests branch from 0ffc477 to ed50c7a Compare February 12, 2026 09:23

andrii0lomakin and others added 10 commits February 15, 2026 16:24

andrii0lomakin force-pushed the ytdb-510-fix-failing-unit-tests branch from ae5bdb0 to b793f81 Compare February 15, 2026 15:25

andrii0lomakin and others added 5 commits February 15, 2026 21:15

andrii0lomakin and others added 13 commits February 16, 2026 05:07

YTDB-510: Fix incorrect formatting in 16 files (Qodana)

74a52cb

Apply IntelliJ code style formatting to fix IncorrectFormatting findings reported by Qodana scan. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

YTDB-510: Remove unused imports in 4 files (Qodana)

2b8c13b

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

YTDB-510: Simplify statement lambdas to expression lambdas (Qodana)

47a482a

Convert 7 single-statement block lambdas to expression lambdas in LocalPaginatedCollectionAbstract.java. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

YTDB-510: Remove redundant type casts in 5 files (Qodana)

23a8731

Remove 7 redundant casts where the expression already returns the target type. Also remove unused imports that became unnecessary. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

YTDB-510: Replace explicit variable types with var (Qodana)

5c571ed

Replace 5 redundant explicit variable type declarations with var in FrontendTransactionImplTest and MapIndexDeleteTest. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

YTDB-510: Wrap ExecutorService in try-with-resources (Qodana)

c6692a5

Convert 6 ExecutorService usages to try-with-resources in AtomicOperationsTableTest, removing explicit shutdown() calls. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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YTDB-510: Fix failing unit tests after Snapshot Isolation implementation#636

YTDB-510: Fix failing unit tests after Snapshot Isolation implementation#636
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ytdb-510-fix-failing-unit-tests

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