4.0.0 — October 2025

https://docs.couchbase.com/sync-gateway/4.0/whatsnew.html

What's Changed

• CBG-4420: fix legacy rev handling on processRev by @gregns1 in #7248
• CBG-4421 create a simpler test setup for two cluster by @torcolvin in #7246
• CBG-4430: fix conflict on hlv comparison when parent rev is in history by @gregns1 in #7249
• CBG-4257 implement more parts of CouchbaseLiteMockPeer by @torcolvin in #7250
• CBG-4416 Use waitForTombstoneVersion to validate tombstone versions by @adamcfraser in #7252
• CBG-4442 proposeChanges fix for VV proposed version and legacy previousRev by @adamcfraser in #7253
• CBG-4432: Implement Delete on the BlipTesterClient and enable delete-related topology tests by @bbrks in #7251
• CBG-4257 add HLV into BlipTesterCollectionClient by @torcolvin in #7264
• Move assertions into blip test code by @torcolvin in #7267
• CBG-4407 synchronously stop xdcr from CBS by @torcolvin in #7270
• CBG-4418 Assert on full HLV in topology tests by @adamcfraser in #7271
• CBG-4448: updates to fix python lint by @torcolvin in #7277
• CBG-4419 wait for xdcr to be finished by @torcolvin in #7278
• CBG-4402 do not terminate attachment migration error on document deletion by @torcolvin in #7268
• Make CouchbaseLiteMockReplication run unidirectional only by @bbrks in #7282
• shorten xattr name to <15 characters, the max length of an xattr name by @torcolvin in #7285
• Topology test fixes by @adamcfraser in #7284
• Various small BlipTesterClient stability improvements by @bbrks in #7283
• Write dummy system xattr on resurrection by @torcolvin in #7292
• CBG-4460 Strip unused HLV content from proposeChanges messages by @adamcfraser in #7294
• Add replication stats logging to topologytests by @torcolvin in #7296
• CBG-4467 do not check revpos for documents replicated using HLV by @torcolvin in #7297
• Add trace logging for changes response by @torcolvin in #7301
• CBG-4468 do not check legacy revtree if hlv is dominating by @torcolvin in #7298
• CBG-4469 Evaluate full HLV when available during proposeChanges by @adamcfraser in #7300
• CBG-4466 Add MV support by @adamcfraser in #7304
• CBG-4474 Fix for MV invalidation ordering by @adamcfraser in #7306
• Do not error when getting stats by @torcolvin in #7307
• CBG-4203 pass RevSeqNo for on demand imports by @torcolvin in #7273
• CBG-4479 wait for correct stop message by @torcolvin in #7317
• CBG-4233 move rosmar to c8f72480 by @torcolvin in #7388
• CBG-4451 use atomic pointer to store testing.T by @torcolvin in #7387
• CBG-4440: HLC implementation for blip tester client by @gregns1 in #7399
• merge main (7e89160) into anemone by @torcolvin in #7403
• CBG-4538 do not expect revSeqNo as a particular value by @torcolvin in #7404
• CBG-4541: rev cache changes merge into anemone by @gregns1 in #7405
• Update Jenkinsfile to drop cobertura plugin and update to go 1.24 by @torcolvin in #7591
• CBG-3936 use BestEffortRetryStrategy for DCPClient by @torcolvin in #7579
• CBG-4705: Branch release/3.3.0 and disable main by @bbrks in #7613
• CBG-4505 update cbgt to latest by @torcolvin in #7616
• CBG-2717: Replace replicator rev stat assertions with a wait for stats by @bbrks in #7619
• Switch version numbers to 4.0, enable builds by @torcolvin in #7623
• tighten github workflow permissions by @torcolvin in #7624
• Update jenkins image to a GA build by @torcolvin in #7625
• add ruff as a dev dependency by @torcolvin in #7612
• CBG-3811 do not assert on processed DCP docs by @torcolvin in #7622
• DOC-13103-updated the description for bootstrap.server by @iamfortune in #7617
• Add a test for import feed panic by @torcolvin in #7626
• Bump github.com/go-jose/go-jose/v4 from 4.0.5 to 4.1.1 by @dependabot[bot] in #7614
• Bump golang.org/x/net from 0.41.0 to 0.42.0 by @dependabot[bot] in #7629
• [4.0.0 forward port] CBG-4740 remove process output from sgcollect by @torcolvin in #7627
• sort openapi properties for readabilty by @torcolvin in #7615
• CBG-4742 purge all xattrs over DCP feed by @torcolvin in #7620
• make XDCR stop integration test more robust by @torcolvin in #7631
• CBG-4379 default LWW for XDCR in test by @torcolvin in #7632
• Bump github.com/couchbase/gocb/v2 from 2.10.0 to 2.10.1 by @dependabot[bot] in #7634
• Increase topologytest high memory watermark by @torcolvin in #7638
• Add Test Coverage: TestCollectionsPublicChannel to ensure changes feed coverage for syncfn granted public docs by @bbrks in #7633
• Test race fix: TestRevocationGetSyncDataError - Replace racy throw bool to atomic by @bbrks in #7639
• Increase WaitUntilReady for tests by @torcolvin in #7642
• CBG-4761: use FrontKey() function for getOldest() by @gregns1 in #7641
• Use WaitUntilReady retry strategy for test pool by @torcolvin in #7643
• CBG-4754: move silent handler to trace level by @gregns1 in #7644
• Revert "Added quick-and-dirty mode to capture failed multipart PUTs" by @bbrks in #7645
• CBG-4280 Improve test assertions for attachments by @torcolvin in #7637
• CBG-4768: add missing silent handler logging level for admin port _expvar by @gregns1 in #7646
• Return when sending a 422 to a rev by @torcolvin in #7651
• CBG-4757: better logging around reconnect for ISGR by @gregns1 in #7650
• CBG-4767: Make _raw endpoint return actual state of persisted doc by @bbrks in #7649
• CBG-4767 2: Make AuditIDDocumentRead tolerant to invalid SyncData in _raw endpoint by @bbrks in #7653
• CBG-4750: Remove show_cv parameter and always return _cv in documents on REST API by @bbrks in #7654
• Simplify bucket names and sourceID for rosmar by @torcolvin in #7655
• CBG-4280 consolidate Attachment on document by @torcolvin in #7647
• CBG-4734: fix for race when removing a value that is being loaded into rev cache by @gregns1 in #7640
• Bump github.com/coreos/go-oidc/v3 from 3.13.0 to 3.15.0 by @dependabot[bot] in #7663
• Improve topologytest logging by @torcolvin in #7664
• CBG-3661: allow configurable sub-protocol version for active replicator by @gregns1 in #7660
• CBG-4452 remove failing test that is not useful by @torcolvin in #7666
• Test-only tech-debt cleanup: Make TestCtx use stdlib testing.Context() instead of a DIY version by @bbrks in #7669
• Print doc state on all peers on failure by @torcolvin in #7670
• Revert "Test-only tech-debt cleanup: Make TestCtx use stdlib testing.Context() instead of a DIY version" by @bbrks in #7672
• CBG-4780: basic ISGR push and pull for 4.0 by @gregns1 in #7668
• CBG-4782: new rev tree property for ISGR replications by @gregns1 in #7671
• CBG-4797: make GetCV mirror GetRev and add request for history to it by @gregns1 in #7673
• CBG-4735: Remove the _globalSync xattr with purge to avoid attachment metadata hanging around by @bbrks in #7667
• CBG-4798: add test for revID replicator write HLV generation by @gregns1 in #7674
• Support new jenkins by @torcolvin in #7680
• Bump golang.org/x/net from 0.42.0 to 0.43.0 by @dependabot[bot] in #7677
• CBG-4737: Remove basic auth command line flags by @bbrks in #7679
• CBG-4538 tests: do not expect revSeqNo as a particular value by @torcolvin in #7675
• CBG-4267 implement LWW conflict resolution for blip tester by @torcolvin in #7657
• fix test flakes by @torcolvin in #7682
• CBG-4753: Add version_type preference for /_changes to allow CV-aware consumers by @bbrks in #7659
• GitHub PR template: Fix Integration Test links by @bbrks in #7684
• CBG-4790: reconcile rev tree on write for ISGR by @gregns1 in #7681
• Fix wait group race in test by @torcolvin in #7685
• CBG-4806: move conflict detection to common function by @gregns1 in #7683
• CBG-4810 blip test: separate user creation by @torcolvin in #7686
• fix race condition by @torcolvin in #7689
• Wait for pending changes after doc updates by @gregns1 in #7690
• CBG-4434 enable conflict tests by @torcolvin in #7688
• CBG-4729: Add metrics to count tombstones per database by @RIT3shSapata in #7691
• Store supported subprotocols on BlipTestClientRunner by @torcolvin in #7692
• CBG-4273: More Frequent log rotation by @RIT3shSapata in #7695
• CBG-4751: Allow CV to be used as OCC value in REST API for document writes (updates/deletes) by @bbrks in #7693
• CBG-4776: Fetch by CV REST API by @bbrks in #7694
• CBG-4800: Remove pending CBG-3814 support of channel removal for CV: error - let not found error bubble up by @bbrks in #7699
• CBG-3778: Remove usages of RestTester DocDirectly functions by @bbrks in #7697
• CBG-4832: Handle legacy rev IDs as deltaSrc even when running in HLV mode by @bbrks in #7698
• CBG-4166: Unskip vv subtests by @bbrks in #7700
• CBG-4813 refactor tests to use consistent HLV format by @torcolvin in #7687
• CBG-4428 re-enable disabled test by @torcolvin in #7701
• Keep collection scoped context by @torcolvin in #7703
• CBG-4428 test: make sure two revisions get pushed as one by @torcolvin in #7702
• fix test wait condition by @torcolvin in #7709
• fix assert to retry until true by @torcolvin in #7707
• CBG-4665 wait for stat by @torcolvin in #7708
• Close buckets in bucket pool by @torcolvin in #7652
• CBG-4829 add test cases for hlv conflicts by @torcolvin in #7704
• CBG-4787 move SyncData.HLV to Document.HLV by @torcolvin in #7710
• CBG-4785: sendChanges support for legacy rev by @gregns1 in #7711
• Fix build for #7711 after #7710 refactoring by @bbrks in #7712
• Strip _cv in stripSpecialProperties by @bbrks in #7713
• Relax document processed assertions for SG_TEST_USE_GSI=true by @torcolvin in #7715
• Remove warning assertion, other tests can leak warnings by @torcolvin in #7716
• CBG-4752: Bulk APIs for CV (read and write) by @bbrks in #7714
• CBG-4778: LWW conflict resolution for ISGR by @gregns1 in #7696
• CBG-4836: legacy rev documents not handled in createChangesEntry by @gregns1 in #7717
• CBG-4776 do not show empty CV if present by @torcolvin in #7719
• CBG-4779: custom conflict resolution for HLV by @gregns1 in #7720
• Improve VV logging by @torcolvin in #7722
• CBG-4258 allow support of a CBL V3 client by @torcolvin in #7721
• CBG-4826 do not managle history if only mv present by @torcolvin in #7723
• CBG-4826 increase wait time for slow computers by @torcolvin in #7724
• Add debug logging by @torcolvin in #7725
• CBG-3748: Support legacy RevTree IDs for Delta Sync by @bbrks in #7718
• CBG-4429: Audit with CV as doc version where possible by @bbrks in #7726
• CBG-4762 make msg ordering agnostic in test by @torcolvin in #7730
• CBG-4846: legacy rev api should not write _vv xattr at all by @gregns1 in #7727
• CBG-3748 follow-up: Remove test skips / re-enable some BLIP legacy rev delta sync codepaths by @bbrks in #7731
• CBG-4841 write legacy rev versions with special encoding by @torcolvin in #7732
• CBG-3806 reenable skipped tests by @torcolvin in #7733
• CBG-4826 increase timeout for CI=true (jenkins/gh) by @torcolvin in #7734
• CBG-4316: Remove allow_conflicts option by @RIT3shSapata in #7729
• CBG-4791: reconcile rev tree on v4 ISGR conflict by @gregns1 in #7728
• CBG-4769: Omit cas mismatch log messages by @RIT3shSapata in #7741
• CBG-4726: Validate disabling xattrs by @RIT3shSapata in #7742
• CBG-4784: non conflicting legacy rev testing cases for ISGR by @gregns1 in #7740
• CBG-4847: legacy rev loading from bucket leave rev cache in inconsistent state by @gregns1 in #7744
• Bump github.com/couchbase/cbgt from 1.4.10-0.20250613153003-c142c64552b2 to 1.4.10 by @dependabot[bot] in #7736
• Bump github.com/couchbase/gocbcore/v10 from 10.7.1 to 10.8.0 by @dependabot[bot] in #7739
• CBG-4830 allow ISGR testing with 3.x protocol by @torcolvin in #7743
• CBG-4830 remove test data race by @torcolvin in #7746
• CBG-4316 wait for database online in test by @torcolvin in #7745
• add back suspend sequence batching for TestReplicationHeartbeatRemoval by @gregns1 in #7747
• CBG-3796: Disable setting enable_star_channel to false by @RIT3shSapata in #7748
• CBG-4341: Compatibility check for Couchbase Server by @RIT3shSapata in #7750
• CBG-3203: Remove non-leaf channel history information from sync metadata by @bbrks in #7753
• CBG-4828: pre upgraded document conflict resolution by @gregns1 in #7751
• CBG-4858: Fix the version compatibility check by @RIT3shSapata in #7758
• Create temporary skip for mobile jenkins by @torcolvin in #7752
• CBG-4826: Ensure blip tester is terminated before Rest Tester by @torcolvin in #7749
• CBG-4808: Add TestXDCRBeforeAttachmentMigration by @bbrks in #7759
• CBG-4855 format Jenkinsfile by @torcolvin in #7760
• CBG-4855 Disable concurrent builds for pipeline jobs by @torcolvin in #7761
• CBG-4851: Compact old PreviousVersion entries from HLV on write by @bbrks in #7763
• CBG-4852 replace go2xunit with gotestsum by @torcolvin in #7754
• CBG-4811: logging changes for versions by @gregns1 in #7764
• CBG-4856 do not create merge versions for remote wins/local wins by @torcolvin in #7767
• CBG-4865: Update database schema for API Docs by @RIT3shSapata in #7765
• CBG-4870 avoid test flakes by @torcolvin in #7771
• CBG-4840: Backup temporary revisions only by revtree ID by @bbrks in #7773
• CBG-4833: Send replacement revision as CV where possible by @bbrks in #7774
• CBG-4849: updates to api docs for ISGR by @gregns1 in #7772
• CBG-4864 Import document if cv changes, even if body is unchanged by @torcolvin in #7775
• CBG-4879: fix for data race when invalidating cache for local wins by @gregns1 in #7778
• CBG-4880: Use versionPruningWindowHrs for HLV Compaction instead of metadata purge interval by @bbrks in #7777
• CBG-4883: decrement stats when removing stale value from cache list in add to lookup map functions by @gregns1 in #7779
• CBG-4839 get maxcas for each vbucket by @torcolvin in #7776
• CBG-4878 Set _mou from attachment migration by @torcolvin in #7781
• CBG-4839 allow vBucketsMaxCas to not be populated by @torcolvin in #7782
• CBG-4884: Skip removal of obsolete attachments if ECCV is set by @bbrks in #7783

New Contributors

• @iamfortune made their first contribution in #7617
• @RIT3shSapata made their first contribution in #7691

Full Changelog: 3.3.0...4.0.0