4.2 Changelog

4.2.24 Changelog

Sharding

SERVER-68361 LogTransactionOperationsForShardingHandler::commit misses transferring documents from prepared and non-prepared transactions changing a document's shard key value

Aggregation

SERVER-49214 Add $toHashedIndexKey expression

Internals

SERVER-58047 $toHashedIndexKey expression doesn't add any dependencies
SERVER-58673 Enable featureFlagPerShardCursor
SERVER-61032 Convert all references to /opt/mongodbtoolchain/gdb to a versioned equivalent
SERVER-62400 Add $_passthroughToShard parameter to AggregateCommandRequest
SERVER-62681 Create change streams per shard cursor passthrough suite
SERVER-62738 Give mongos the ability to passthrough to a specific shard
SERVER-63772 Post Batch Resume token not sent on initial batch from per shard cursor change stream
SERVER-63773 Per Shard cursor post batch resume token not set in getMore responses
SERVER-63774 Pass optional dbVersion to runPipelineOnSpecificShard
SERVER-63781 $sortKey not filtered out in initial batch from post batch resume token
SERVER-68115 Bug fix for "elemMatchRootLength > 0" invariant trigger
SERVER-68126 Check for negative maxChunkSize input value in AutoSplitVector
SERVER-68901 Incorrect $elemMatch query analysis in mongocryptd if document contains 2 different fields with the same name
SERVER-69001 Initial sync should set the minValid document to the "stopTimestamp"
SERVER-69004 [4.2] backport pm-2419 Per Shard Cursors via mongos
SERVER-69348 Commands must declare empty auth checks to be universally callable
SERVER-69569 Python scripts failing in Evergreen tasks
SERVER-69785 robustify change_streams_per_shard_cursor.js
SERVER-69944 Resmoke's globstar.py does not properly parse * before **
SERVER-70299 Remove JSON.send command usage
SERVER-70348 Remove EAGAIN for queryable WT and retry internally
SERVER-70394 Fix self-swap in MultiPlanStage::removeRejectedPlans
SERVER-70469 Use virtual env python in watchdog tests
SERVER-70483 Update Resmoke to pass "evergreen_execution" up to logkeeper.
SERVER-70484 Remove signal processing module from perf.yml and sys_perf.yml
SERVER-70553 Add module support to the mongo test runner
SERVER-70633 Make per shard cursors suite actually run tests in 5.0
SERVER-70938 Remove --system-site-packages from virtual env setup
SERVER-71389 [v4.2] Add bsonUnorderedFieldsCompare
SERVER-71424 Fix failures in lint_fuzzer_sanity
SERVER-71471 Improve jstestfuzz deployment to work with new node run/install
SERVER-71533 Update legacy task generation to use new test stats location
SERVER-71534 lint_fuzzer_sanity_all regression caused by running multiple instances of npm
SERVER-71624 Remove lint_fuzzer_sanity_patch in favor of lint_fuzzer_sanity_all
SERVER-71759 dataSize command doesn't yield
SERVER-71772 Update ARM builds to target armv8.2-a on older branches
SERVER-71875 Stop run jstestfuzz on rhel62
SERVER-72137 Handle case when test stats are not available
SERVER-72288 microbenchmark tests fail after "Enable M1 Mac support for DSI"
SERVER-72294 Upgrade all uses of sus12 to suse12-sp5
SERVER-72535 Sharded clusters allow creating the 'admin', 'local', and 'config' databases with alternative casings

4.2.23 Changelog

Sharding

SERVER-56127 Retryable update may execute more than once if chunk is migrated and shard key pattern uses nested fields
SERVER-63732 Add new implicitlyCreateIndex and enforceUniquenessCheck to shardCollection command

Internals

SERVER-61275 Destruct the size storer after the session cache has shutdown
SERVER-64573 Make implicitlyCreateIndex and enforceUniquenessCheck fields optional
SERVER-64659 Report in serverStatus number of file descriptors used during index builds
SERVER-64741 Create mongos appendOplogNote command
SERVER-66310 Make ExpressionSetUnion::isCommutative() collation aware
SERVER-66726 Fix serialization in killAllSessionsByPattern
SERVER-68158 serverstatus_indexbulkbuilder.js should run listIndexes on primary after creating indexes
SERVER-68359 Prevent TTLMonitor from processing index if expireAfterSeconds is NaN
SERVER-68487 add BSONElement method to check for NaN field values
SERVER-68574 Switch to the new logkeeper cluster
SERVER-68691 $graphLookup does not report variable references for 'restrictSearchWithMatch' filter
SERVER-68714 NaN issues in secure random number generator in mongo shell
SERVER-68925 Reintroduce check table logging settings at startup (revert SERVER-43664)
SERVER-69611 Set the -ffp-contract=off compiler option by default

4.2.22 Changelog

Sharding

SERVER-58747 The ShardServerCatalogCacheLoader doesn't interrupt ongoing operations on step up
SERVER-62272 Adding schema validation to a collection can prevent chunk migrations of failing documents
SERVER-62656 Decouple mongos-to-config-server connection pool sizing from mongos-to-shard-server connection pool sizing

Build and Packaging

SERVER-61894 Support the 'showRawUpdateDescription' option in change stream specs
SERVER-63159 Implement the $_internalApplyOplogUpdate aggregation stage

Internals

SERVER-55173 Segmentation fault in WiredTigerSession::releaseCursor
SERVER-59658 Improve logging to reflect that sharding metadata refresh waiting on replication
SERVER-60334 Avoid caching the cursor and session in WiredTigerSizeStorer
SERVER-60607 improve handling of large/NaN values for geo index version
SERVER-61321 Improve handling of large/NaN values for text index version
SERVER-64403 Find queries with SORT_MERGE collation-encode the missing sort attribute
SERVER-66418 Bad projection created during dependency analysis due to string order assumption
SERVER-66461 Run notarization earlier in the build process
SERVER-66556 Prevent potential race when releasing cursors during shutdown
SERVER-67993 fix 4.4 pylinters errors
SERVER-68130 AutoSplitVector could generate response bigger than BSONObjMaxUserSize
SERVER-68199 An active index build on the existing target collection of a renameCollection command can fail the mongod

4.2.21 Changelog

Build and Packaging

SERVER-64332 Notarize MongoDB builds for macos
SERVER-67139 Update rhel6 package test ami

Internals

SERVER-58506 Command to expose settability for Server Parameters
SERVER-61097 SizeStorer can cause deadlocks with cache eviction
SERVER-64184 Track usage of allowDiskUse:true in agg command
SERVER-65166 Use compareOptimes in abort_in_progress_transactions_on_step_up.js
SERVER-65244 Add RHEL 7 s390x to 4.2
SERVER-66176 [v4.4/v4.2] Minimize work under CollectionCatalog mutex
SERVER-66559 Expand the internalQueryMaxAddToSetBytes param from 32 to 64 bits
SERVER-66799 Fix getParameterWithDetails.js failure on ephemeralForTest
SERVER-66955 Remove JSON.send usage in perf projects

4.2.20 Changelog

Sharding

SERVER-64903 Make cancel_coordinate_txn_commit_with_tickets_exhausted.js robust to ShardServerCatalogCacheLoader performing deletes

Aggregation

SERVER-41714 $facet operator duplicates documents in the pipeline when preceded by $addFields and $match operators (in this exact order)

Internals

SERVER-53726 Platform Support: Remove RHEL6 zSeries
SERVER-57000 Fix handling of correlated pipeline with facet
SERVER-57676 Wait for a checkpoint before releasing the "hangOplogCapMaintainerThread" in oplog_rollover.js
SERVER-59435 Fix a double free inside DocumentSource::optimizeAt()
SERVER-60412 Host memory limit check does not honor cgroups v2
SERVER-62242 $indexOfArray does not work with duplicate values in array
SERVER-63141 Difference in $lookup/$redact/$let behaviour with pipeline optimization
SERVER-64642 Fix error where mongos returns CallbackCanceled and not InterruptedAtShutdown on shutdown
SERVER-64983 Release Client lock before rolling back WT transaction in TransactionParticipant::_resetTransactionState
SERVER-65421 Fix package test failures on RHEL 6/7
SERVER-65422 Fix package test failures on Ubuntu 16.04

4.2.19 Changelog

Sharding

SERVER-26755 Collection chunk loading is aborted entirely if fetching all the chunks takes more than 30 seconds
SERVER-45149 replSetStepDown command in txn_two_phase_commit_failover.js should not timeout
SERVER-53335 Queries, updates, and deletes with non-"simple" collations may miss documents when using hashed sharding
SERVER-59929 unexpected slower update/insert operation bease of splitchunk and moveChunk
SERVER-60682 TransactionCoordinator may block acquiring WiredTiger write ticket to persist its decision, prolonging transactions being in the prepared state
SERVER-61816 cancel_coordinate_txn_commit_with_tickets_exhausted.js can hang forever due to race condition between transaction reaper and transaction coordinator
SERVER-61924 retryable_mongos_write_errors.js fails in 4.2 multiversion suites due to missing failpoint command in 4.0
SERVER-62065 Upgrade path from 3.6 to 4.0 can leave chunk entries without history on the shards
SERVER-62739 cancel_coordinate_txn_commit_with_tickets_exhausted.js test should not be run with the ephemeral storage engine
SERVER-62906 Add a check in the createCollection/shardCollection path verifying the collection name length

Query

SERVER-23664 $mod match expression should raise an error when the remainder is not a number
SERVER-40691 $nin:[[],...] queries are not indexed
SERVER-57588 Inconsistent query results when an array position is indexed whose value is an array
SERVER-59754 Incorrect logging of queryHash/planCacheKey for operations that share the same $lookup shape
SERVER-62147 Exhaust query using the OP_QUERY protocol is broken when more than one getMore batch is required

Aggregation

SERVER-44484 Changestream with updateLookup uasserts on updates from before collection was sharded

Storage

SERVER-55483 Add a new startup parameter that skips verifying the table log settings

Internals

SERVER-51087 Add testing utility for creating an empty sharded collection with the specified bounds
SERVER-53726 Platform Support: Remove RHEL6 zSeries
SERVER-57312 Pin transitive Python dependencies and use the pinned file for installation in Evergreen
SERVER-60392 Fix timing in priority_takeover_two_nodes_equal_priority test.
SERVER-60685 TransactionCoordinator may interrupt locally executing update with non-Interruption error category, leading to server crash
SERVER-61662 SCons configure checks should always run with verbosity
SERVER-61743 The -fno-builtin-memcmp flag shouldn't be applied except on x86_64 platforms
SERVER-62005 [4.2] Add requires_document_locking to unique_index_insert_during_collection_scan.js
SERVER-62164 Remove several obsoleted build variants across all stable branches
SERVER-62320 (v4.2) Fix use after std::move in find command
SERVER-62668 Synchronize access to ImpersonatedUserMetadata in OperationContext.
SERVER-62825 Robustify causally_consistent_index_builds.js
SERVER-63197 Pin microbenchmarks genny version
SERVER-63203 Chunk splitter never splits if more than 8192 split points are found
WT-7993 If gathering handles and not in aggressive eviction mode, have eviction sleep to let checkpoint grab a contentious spinlock.

4.2.18 Changelog

Sharding

SERVER-48504 Combination of StaleShardVersion and ShardNotFound exception make the ChunkManagerTargeter crash
SERVER-54064 Sessions on arbiters accumulate and cannot be cleared out
SERVER-54623 Decrease number of jobs in causal consistency passthrough suites
SERVER-56226 [v4.4] Introduce 'permitMigrations' field on config.collections entry to prevent chunk migrations from committing
SERVER-56227 Add user-facing command to set allowMigrations to false for a sharded collection
SERVER-58985 Re-enable retryable_mongos_write_errors.js in multiversion suite once SERVER-55648 is backported to v4.0
SERVER-59160 Disable balancer in test_stacked_migration_cleanup.js
SERVER-59916 T{1, 2}Starts{First, Second}AndWins In WriteConflictHelpers Does Not Synchronize Committing Of Failed Transaction
SERVER-60653 Backport the autoSplitVector logic to v4.2

Replication

SERVER-50241 PeriodicShardedIndexConsistencyChecker should skip dropped collections
SERVER-56096 Invariant failure in ReplicationRecoveryImpl::recoverFromOplog
SERVER-58988 Avoid sync source selection cycle during primary catchup.

Aggregation

SERVER-59613 $range expression should error if it exceeds memory limit

Storage

SERVER-45953 Exempt oplog readers from acquiring read tickets

Operations

SERVER-28953 Capture df (disk full) statistics in FTDC
SERVER-53242 Always log collmod command

Internals

SERVER-52976 [4.2] collection_validation.cpp isn't used anywhere in the 4.2 branch
SERVER-53726 Platform Support: Remove RHEL6 zSeries
SERVER-55589 replSetMaintenance command does not take the RSTL
SERVER-56326 Add a round() method to the Decimal128 class
SERVER-56602 Track usage of match expressions in serverStatus
SERVER-57557 [v4.4] Support running checkFCV() shell helper with mongos connection
SERVER-57605 Expose Decimal128 equality comparison helper to shell
SERVER-58104 config.system.sessions collection can end up with invalid chunks if it is dropped and re-sharded with a shard key other than _id
SERVER-58119 single_node_set_new_hostname.js needs to call replSetReconfig with an assert.soonNoExcept
SERVER-58183 _applyPrepareTransaction does not ensure prepareConflictBehavior is kIgnoreConflictAcceptWrites on retry attempts
SERVER-58192 Use more unique_ptrs in QueryPlannerAnalysis::analyzeSort()
SERVER-58780 [v4.4] Ensure that _shouldSetStableTimestamp gets restored to true if replSetInitiate fails
SERVER-59108 Resolve race with transaction operation not killed after step down
SERVER-59120 Create unit tests for commitChunksMerge
SERVER-59191 SPIKE: git.get_project fails to clone
SERVER-59226 Deadlock when stepping down with a profile session marked as uninterruptible
SERVER-59294 Check action type for oidReset
SERVER-59459 mongodb fails to build with glibc-2.34
SERVER-59725 Remove push task from extra RHEL 6.2 variants
SERVER-59804 Using a separate branch for YCSB in system_perf.yml
SERVER-59879 Adjust maxTimeMS value to allow for slower execution in the parallel test suite
SERVER-60080 [v4.2] Disable tests incompatible with ephemeralForTest
SERVER-60085 Cap number of fallback test suites at number of tests in suite
SERVER-60149 Add RRFaM build variant to mongocryptd list on v4.2 branch
SERVER-60290 Update Windows external auth test distro
SERVER-60299 Backport PCRE bugfix for Bugzilla #2613
SERVER-60456 LDAPBindOptions go out of scope during heavily delayed binds on Windows
SERVER-60496 Resmoke Misinterprets Quotes In Evergreen.yml
SERVER-60582 [v4.4] initiate_emrc_false.js needs to wait for the initial checkpoint
SERVER-60588 $multiply incorrectly throws an error in some cases in the classic engine
SERVER-60670 use a separate branch instead of a specific commit for TPCC
SERVER-60671 Remove dagger
SERVER-60897 [4.2] mongod may loop forever when attempting to upsert invalid BSON
SERVER-60898 [v4.2] Exclude stepdown_race_with_transaction.js from running on ephemeralForTest
SERVER-60961 Add exclude tags to old branches not generating multiversion_exclude_tags.yml
SERVER-60971 Remove calls to BF suggestion service
SERVER-61164 Accept error code 48 (Inappropriate authentication) as a valid response for LDAP liveness check
SERVER-61427 Unique index builds can cause a loss of availability during commit due to checking many false duplicates
SERVER-61544 [4.2] Fix exclusion tag for stepdown_race_with_transaction.js
SERVER-61550 Modify auto_workload_path in perf.yml to be relative to cwd
SERVER-61791 pin pymongo
WT-7566 Resolve write after free for dead dhandle
WT-7858 Fix malloc writing out of bounds for overflow keys
WT-7984 Fix a bug that could cause a checkpoint to omit a page of data

4.2.17 Changelog

Storage

SERVER-49521 fix tests in core/txn to use write concern "majority" for createIndexes commands run before starting transactions

Internals

SERVER-48090 Support python 3.6 for evergreen.py and shrub.py
SERVER-50549 Transform connection-related error codes in proxied commands
SERVER-53726 Platform Support: Remove RHEL6 zSeries
SERVER-59456 Start the LDAPReaper threadpool
SERVER-59876 Large delays in returning from libcrypto.so while establishing egress connections

4.2.16 Changelog

Security

SERVER-57727 Race conditions in x509_invalid.js

Sharding

SERVER-55648 Mongos doesn't return top-level batch-write error in case of shutdown
SERVER-58909 Missing versions for "admin" and "config" databases migrating to version 4.2

Replication

SERVER-34938 Secondary slowdown or hang due to content pinned in cache by single oplog batch
SERVER-36263 Bypassing operation validation in applyOps should require special privilege
SERVER-37904 Allow a node to override the cluster chaining (enabled/disabled) setting
SERVER-39621 Disabled chaining should enforce sync source change when the primary steps down even if the oplog fetcher isn't killed on sync source
SERVER-41875 Should ban "emptyCapped" commands on jstestfuzz_concurrent_replication_continuous__stepdown suite for WiredTiger Storage.
SERVER-50486 invokeWithSessionCheckedOut being called on prepared transactions on secondaries
SERVER-55465 Fix Invariant upon failed request for a vote from the current primary in the election dry-run of catchup takeover
SERVER-58258 Wait for initial sync to clear state before asserting 'replSetGetStatus' reply has no 'initialSync' field

Query

SERVER-55319 [4.2] Invariant failure isVersionInitialized() src/mongo/db/server_options.h 217 after index build completes
SERVER-58127 Fix benchRun() memory leak for parsing benchRun() args under exception

Build and Packaging

SERVER-54729 MongoDB Enterprise Debian/Ubuntu packages should depend on libsasl2-modules and libsasl2-modules-gssapi-mit

Internals

SERVER-49237 Add a way for OperationContexts to opt-in to always getting interrupted at stepdown
SERVER-50547 Explore aggregation pipeline length limit
SERVER-52728 Upgrade path from MongoDB 2.4 to 4.2 causes config servers to go down
SERVER-53431 Server should respond running operations with appropriate topologyVersion on stepdown
SERVER-53726 Platform Support: Remove RHEL6 zSeries
SERVER-55649 Sharding messages being logged for non-sharded clusters
SERVER-56489 New pass-through test with random hello server-side delays
SERVER-56516 Fix undefined behaviour in parsing code for $slice projectional operator
SERVER-56839 Index seeks concurrent with recently-committed prepared transactions can return wrong results
SERVER-57033 The AuthorizationManager Cache in 4.2 should use roles as cache key
SERVER-57064 Log create index and dropIndex(es) on mongos
SERVER-57360 Log additional debug info for the "invariant (_requests.empty());" in ~LockerImpl
SERVER-57642 Invariant Failure on src/mongo/db/query/plan_yield_policy.cpp 75 | Aborting
SERVER-57650 Make MigrationChunkClonerSource interruptible when waiting response to recipient commands
SERVER-57798 Direct user to MongoDB Compass download page when failing to install MongoDB Compass due to a connection issue using ./install_compass
SERVER-57983 Integer overflow for $range in Classic Engine
SERVER-58169 Log timestamps info on hitting invariants around stable timestamp calculation
SERVER-58187 Improve Connection Reaper and MongoLDAP performance
SERVER-58191 [Migrate Protocol] Allow delete_during_migrate.js to tolerate chunk migration failures due to timeout in catchup phase in slow variants.
SERVER-58283 Add a new versioning file to set MONGO_VERSION and MONGO_GIT_HASH
SERVER-58313 Fix package test failure caused by SERVER-55460 backport to v4.2 and v4.0
SERVER-58402 Increase timeout of shutdown command in shutdown_primary.js
SERVER-58623 Shorten the mongos RSM refresh interval in delayed Hello tests
SERVER-58826 [4.2] Disallow compact_keeps_indexes.js and explain_shell_helpers .js to run concurrently on parallel suite
SERVER-59074 Do not acquire storage tickets just to set/wait on oplog visibility
SERVER-59135 Make mongocryptd targets in MSIs depend on libsasl2
SERVER-59197 Delete fam image entries when the corresponding session documents are deleted
SERVER-59242 update to snmp 5.9.1
SERVER-59262 Remove burn_in_tests tasks from storeFindAndModifyImagesInSideCollection build variants
SERVER-59388 Revert BACKPORT-10185
SERVER-59414 Retry curator setup in powercycle on older branches
WT-6568 Fix split generation use
WT-6926 Update WiredTiger source code to include 2021 copyright notices
WT-7065 Add check for WT_DHANDLE_DEAD to assertion
WT-7135 Additional checks to detect when writing corrupted metadata
WT-7437 Upgrade documentation to doxygen 1.8.17
WT-7675 Query last ckpt timestamp changes without taking checkpoint
WT-7721 Update test-format to reopen an existing database with different config
WT-7776 Add a hard limit on the number of modify updates before we instantiate a complete update
WT-7871 Remove comment that is no longer true

4.2.15 Changelog

Security

SERVER-56240 Turn on checkpointing for the keystore Data Store

Sharding

SERVER-46811 multi=true updates can modify the shard key of orphan documents and cause them to become owned
SERVER-47534 Unblacklist mongos_dataSize.js from sharding_last_stable_mongos_and_mixed_shards suite
SERVER-47699 Change yield type used by range deleter from YIELD_MANUAL to YIELD_AUTO
SERVER-48648 Return updated ShardVersion in _configsvrCommitChunkMerge to avoid blind metadata refresh
SERVER-48653 Return updated ShardVersion in _configsvrCommitChunkSplit to avoid blind metadata refresh
SERVER-51170 Ensure database refreshes are performed after ShardingState initialization
SERVER-53029 Port the changes for SERVER-52955 to later branches
SERVER-56515 Chunk merge doesn't consider the incrementChunkMajorVersionOnChunkSplits parameter
SERVER-56654 Do not use the collection distributed lock for chunk splits
SERVER-56779 Do not use the collection distributed lock for chunk merges
SERVER-56786 There are three routing info refreshes and two chunk scans on the mergeChunks path
SERVER-57009 Additional debugging information in case of crash during FCV change
SERVER-57055 delete_during_migrate.js is consistently failing in test suites with Code Coverage enabled
SERVER-57102 Fixing invariants on ShardServerCatalogCacheLoader to consider different terms
SERVER-58109 The new '_configsvrMergeChunks' path is more expensive than the old one

Replication

SERVER-44316 Log message in InitialSyncer for setting begin applying timestamp is incorrect
SERVER-45919 replSetReconfig should be allowed to fail with InterruptedDueToReplStateChange when racing with an election
SERVER-53447 Blacklist insert1.js with from transaction passthrough tests with failures
SERVER-55465 Fix Invariant upon failed request for a vote from the current primary in the election dry-run of catchup takeover
SERVER-55766 Introduce an optimized "for restore" startup replication recovery mechanism
SERVER-56054 Change minThreads value for replication writer thread pool to 0
SERVER-56415 AwaitNodesAgreeOnPrimary doesn't work when given non-default set of nodes
SERVER-56937 upgradeSet() in multi_rs.js may lose authentication state while upgrading primary

Write Operations

SERVER-38909 Permit empty update modifiers, treating as a no-op rather than an error

Storage

SERVER-51699 index_build_restart_secondary.js (indexbg_restart_secondary.js) should handle exceptions when checking indexes after restarting node

Operations

SERVER-48567 Warnings while processing snmpwalk

Build and Packaging

SERVER-50568 Platform Support: Remove Ubuntu18.04 zSeries from 5.0
SERVER-55460 Fix RPM packaging and testing for SLES 12

Internals

SERVER-37125 Powercycle should ignore a process reference if it no longer exists
SERVER-43617 Add metrics on the mongos to indicate the number of shards targeted for the commands (find, aggregate, etc)
SERVER-45153 Ignore metrics temp files in FTDCFileManager
SERVER-47509 resmoke accepts multiple "mongodSetParameters" options but only uses the last one
SERVER-47720 Clarify "RecordId(...) not found in the index for key" log message
SERVER-48636 Increase assertEventDoesNotWakeCursor getMore timeout in only_wake_getmore_for_relevant_changes.js
SERVER-48890 allow $addFields with empty document and have it be a no-op
SERVER-49336 Set client metadata if it is missing during failCommand
SERVER-50955 oplog_rollover.js pauses the OplogCapMaintainerThread until truncation is needed
SERVER-53334 Hitting unexpected invariant failure, causing server shutdown
SERVER-53643 Startup can see old version of featureCompatibilityVersion document
SERVER-53726 Platform Support: Remove RHEL6 zSeries
SERVER-53728 Platform Support: Remove SLES12 zSeries
SERVER-53841 Additional logging for oplog_rollover.js
SERVER-54489 Full validation can append errors without bound
SERVER-54897 Adding the shard-single config to etc/system_perf.yml
SERVER-55019 install_compass does not run on all supported platforms
SERVER-55119 Create startup warning indicating that X.509 certificates without SANs are deprecated
SERVER-55316 Disconnect LDAP connections out of line
SERVER-55742 Define kmipClientCertificateSelector config on windows/macOS
SERVER-56062 Restart index builds after CappedPositionLost errors
SERVER-56164 All performance projects use the master DSI branch
SERVER-56273 Update curator hash in powercycle remote host setup
SERVER-56307 The chunk migration "convergence algorithm" is very primitive
SERVER-56310 Use w: majority for createCollection command in kill_sessions_with_prepared_transaction.js
SERVER-56325 Wait for failpoint in server_transaction_metrics.js to be hit so that a valid serverStatus is received
SERVER-56347 Enable LSE intrinsics in release
SERVER-56372 Add retryableFindAndModifyStorageLocation server parameter
SERVER-56373 [RRFaM] When writing FaM images to txn table, write oplog entries with needsRetryImage
SERVER-56374 [RRFaM] Have update path write to config.image_collection
SERVER-56375 [RRFaM] Have delete path write to config.transactions
SERVER-56376 [RRFaM] Add jstest that exercises both retryable FaM behaviors
SERVER-56377 [RRFaM] Add FSM test to perform retryable FaM while flipping server parameter
SERVER-56452 Self anchor in PooledLDAPConnection::setup's callback
SERVER-56468 Incorrect plan cache entry for {$ne: null} predicate, leads to missing query results
SERVER-56501 Add op counters for legacy op codes (OP_QUERY, OP_INSERT, etc.)
SERVER-56563 [RRFaM] Forge noop image oplog entries for chunk migration
SERVER-56630 Unittest OpObserverImpl::onDelete/onUpdate paths for retryable findAndModify
SERVER-56713 [RRFaM] Avoid creating images while in initial sync
SERVER-56715 Using incorrect var name for logkeeper dataset on 4.2
SERVER-56819 $indexOfCP returns incorrect result when searching for empty string inside empty string with non-zero start index (classic execution engine only)
SERVER-56952 [4.4] Add new build variant with storeFindAndModifyImagesInSideCollection=true
SERVER-57015 [RRFaM] Writing to the image collection must be in an UnreplicatedWriteBlock
SERVER-57036 Pin MarkupSafe == 1.1.0
SERVER-57043 Test for Branching
SERVER-57053 Rewriting $nor with a $text predicate to $not is invalid
SERVER-57057 Reduce routing info refreshes on the mergeChunks path
SERVER-57091 Infinite loop in GranularityRounderPreferredNumbers::roundDown
SERVER-57145 Invariant failure at OCSPManager::requestStatus
SERVER-57157 assert serverStatus command works in getBinVersion() jstest helper
SERVER-57172 Do json.send before DSI post_run
SERVER-57173 Write invalidated image for retryable findAndModify when secondaries apply operations earlier than minValid
SERVER-57233 Reap LDAP connections inline if multithreading is not enabled
SERVER-57273 remove the flow_control_replica_set.js test
SERVER-57275 Update kmip_server.py to be more verbose
SERVER-57299 Need to wait for failed exit code in startup_recovery_for_restore_needs_rollback.js
SERVER-57328 Make ReplsetTest.upgradeSet() tolerant of reelections
SERVER-57330 Update perf yaml configs for perf and sys-perf to use perf.send
SERVER-57476 Operation may block on prepare conflict while holding oplog slot, stalling replication indefinitely
SERVER-57490 [v4.2] Add storeFindAndModify build variant name to mongodcryptd list in etc/evergreen.yml
SERVER-57497 store_retryable_find_and_modify_images_in_side_collection.js should account for a later clustertime in retried findAndModify responses
SERVER-57544 Also backport store_retryable_find_and_modify_images_in_side_collection.js to 4.2
SERVER-57564 Increase system timeout duration to >2 hours to allow fio to copy over all files
SERVER-57708 ClientMetadata Parsing errors can leave ClientMetadataState decoration in invalid state
SERVER-57768 Deprecated counters aren't reset to zero on wrap
SERVER-57897 Add readPrefMode option to benchRun find/findOne ops
SERVER-57954 Update TPC-C version in sys-perf.yml

4.2.14 Changelog

Sharding

SERVER-52564 Deadlock between step down and MongoDOperationContextSession

Replication

SERVER-50412 Change “not master” error messages to “not primary”
SERVER-50414 Change “not master or secondary; cannot currently read from this replSet member” to “not primary or secondary; cannot currently read from this replSet member”
SERVER-54180 ReplSetTest's stepUp function only waits 6 seconds for nodes to agree on primary
SERVER-55007 Deadlock between step down and MongoDOperationContextSession

Query

SERVER-54710 Large number of $or clauses can create profiling entry exceeding max BSON size, causing the query to fail when it should not

Storage

SERVER-44821 retrieving storage stats for currentOp blocked by slow oplog application

Operations

SERVER-54770 Add /proc/meminfo MemAvailable to FTDC

Build and Packaging

SERVER-54031 errorcodes.py doesn't check embedded C++ code in Python scripts
SERVER-54057 Mongodb-org-server el8 package has dependency on python2
SERVER-54386 mongodb 3.6.22 install fails if systemctl daemon is not running
SERVER-55067 Migrate Windows builds to VS Current distro

Internals

SERVER-5722 Support a 'sort' field in ops array for JS Benchmarking Harness
SERVER-42944 scons compiledb exits with a stack trace
SERVER-49054 Server MSI should install Compass instead of Compass Community
SERVER-51465 Update package tests after compass installer update
SERVER-52610 Verify installation prefix is added to correct location in the RPM
SERVER-52833 Capped collections can contain too many documents after replication recovery
SERVER-52953 $geoNear does not always match coordinate given to 'near' when maxDistance is set to 0
SERVER-53566 Investigate and reproduce "opCtx != nullptr && _opCtx == nullptr" invariant
SERVER-54136 Make the authenticate command respect enforceUserClusterSeparation
SERVER-55038 Collect data files if zbigMapReduce.js fails
SERVER-55189 Call awaitReplication() before returning from syncFrom() in rslib.js
SERVER-55225 [v4.2] Collect data files for incremental_backup_rollback.js
SERVER-55395 4.0.23 does not build with gcc 10
SERVER-55602 Relax non-read-only invariant in WiredTigerKVEngine::makeTemporaryRecordStore when recoverToOplogTimestamp is specified
SERVER-55753 Use w: majority for createCollection command in transactions_committed_with_tickets_exhausted.js
SERVER-56164 All performance projects use the master DSI branch
SERVER-56371 Upgrade timelib to 2021.06
SERVER-56451 [4.2] update test for backup API to retry on conflict with checkpoint thread
WT-7373 Improve slow random cursor operations on oplog

4.2.13 Changelog

Sharding

SERVER-53236 Disable merge_with_move_primary.js from running on the sharding_csrs_continuous_config_stepdown suite
SERVER-53651 Just search for user-issued profiled aggregation in read_pref_cmd.js
SERVER-54014 Define a reasonable maxTimeMsOverride for the checkOID requests

Replication

SERVER-51163 Mark nodes returning InvalidReplicaSetConfig in heartbeats as down
SERVER-53248 call awaitLastOpCommitted before committing transaction in retryable_prepared_commit_transaction_after_failover.js
SERVER-53609 lastCommittedTransaction section causes frequent schema changes that limit FTDC retention
SERVER-53666 curSecondary in rollback test fixture not guaranteed to be in SECONDARY state after restart
SERVER-54339 Prevent spontaneous elections in rollback_crud_op_sequences.js
SERVER-54648 Add correct log verbosity to disallow_adding_initialized_node2.js

Query

SERVER-47869 Add diagnostic logging to ClusterCursorManager
SERVER-48442 Fix change_streams.js to test events in any order
SERVER-50073 Error message when creating a mixed hashed/not hashed index does not state the problem
SERVER-54660 Make jstests/sharding/kill_pinned_cursor.js more robust

Storage

SERVER-46876 During the eviction pressure, we should quit the compact operation instead of crashing the process
SERVER-54760 (4.2) Ghost timestamps can cause concurrent causal snapshot reads to not read their own writes

Build and Packaging

SERVER-52705 Rebuilding mongodb according to building.md failed because python3 is an alias/link (led to ModuleNotFoundError)
SERVER-54058 Update Debian 10 AMI for package testing
SERVER-54255 Update RHEL 7 AMI for package testing
SERVER-54858 Update Amazon Linux AMI for package testing

Internals

SERVER-35649 Nodes removed due to isSelf failure should re-attempt to find themselves
SERVER-43904 When stepping down, step up doesn't filter out frozen nodes
SERVER-44132 DataBuilder move assignment computes size incorrectly
SERVER-45836 Provide more LDAP details (like server IP) at default log level
SERVER-46686 Explain does not respect maxTimeMS
SERVER-46740 establishCursors() must always drain the AsyncRequestsSender::_baton
SERVER-47030 Fix date_time_support code to not produce exceptions
SERVER-49222 ARM64 support on Amazon Linux 2
SERVER-50592 Update mypy pip requirement
SERVER-51038 resmoke.py can't be run on python 3.8
SERVER-51722 Ensure that MongoDB builds with ARM LSE atomics
SERVER-52884 Remove race in reconstruct_prepared_transactions_initial_sync.js
SERVER-53196 Fail to generate tasks if a large distro is specified but not available
SERVER-53394 Make ShardingTaskExecutorPoolReplicaSetMatching default to disabled for MongoD
SERVER-53579 python's dev-requirements.txt is incompatible with pip 20.3.3
SERVER-53612 StepDown hangs until timeout if all nodes are caught up but none is immediately electable
SERVER-53717 Dynamically split large concurrency tasks
SERVER-53780 Fix missing quote in test parameters
SERVER-53831 Force SpiderMonkey to garbage collect in ReplSetTest.checkOplogs
SERVER-53836 Add multiversion-related expansions on Enterprise Ubuntu 16.04 (with {taskExecutorPoolSize=4}) build variant
SERVER-53932 Multikey write during recovery of prepared transaction could use commit timestamp < stable timestamp
SERVER-53992 Remove calls to detect-outliers from performance tasks
SERVER-54091 Update assertion messages for dbhash check run by resmoke.py
SERVER-54134 Ignore newer mongo versions on older branches of setup_multiversion_mongodb.py
SERVER-54139 Remove CURL share support from HTTP curl client
SERVER-54278 Add feature flag to disable Opportunistic Reads by default
SERVER-54366 Wait for node to start stepdown before killing shutdown operation in force_shutdown_primary.js
SERVER-54369 Update Jasper gRPC to latest version
SERVER-54458 updated vendored scons to use uuid for cache tmpfiles
SERVER-54484 resmoke/util/archival.py relies on deprecated and now removed thread.isAlive
SERVER-54505 Fix logic for ignored large distro build variants in 4.2
SERVER-54684 Decreased JS performance on arm64 due to mising init function
SERVER-54685 wrong definition of MONGO_YIELD_CORE_FOR_SMT for arm64
SERVER-54733 Enterprise Ubuntu 16.04 arm64 aggregation_multiversion_fuzzer failures
WT-6309 Add support for start/stop arguments to wt printlog command
WT-6430 Move WT_CONN_SERVER flags into their own field
WT-6844 Make force stop durable
WT-7026 Atomically read and set ref->addr in case of race
WT-7027 Run the metadata checkpoint for force_stop at read-committed isolation for incremental backup
WT-7028 Sweep thread shouldn't lock during checkpoint gathering handles
WT-7104 Redact user data from printlog output

4.2.12 Changelog

Sharding

SERVER-46393 Always check client last operation time when computing operationTime to append to the response
SERVER-50900 Disable PeriodicShardedIndexConsistencyChecker for cursor_valid_after_shard_stepdown.js
SERVER-52732 Uptime reporter disables autosplit during ShardingTest initialization
SERVER-53444 Make tests that run removeShard in assert.soon to wait for the state to become "completed" not error on ShardNotFound

Replication

SERVER-49187 Make ReplSetTest .stepUp() robust to election failures.
SERVER-50049 assert.soonNoExcept() should not access TestData.traceExceptions for non-resmoke tests.
SERVER-50416 Change notMasterLegacyUnacknowledgedWrites to notPrimaryLegacyUnacknowledgedWrites in serverStatus
SERVER-50417 Change notMasterUnacknowledgedWrites to notPrimaryUnacknowledgedWrites in serverStatus
SERVER-50869 Background sync may erroneously set applied-through during step-up
SERVER-50901 RollbackTest should wait for secondaries before doing data consistency checks
SERVER-52560 oplog_writes_only_permitted_on_standalone.js must wait for insert to be in stable checkpoint
SERVER-52680 Removed node on startup stuck in STARTUP2 after being re-added into the replica set
SERVER-52744 rollback node's lastApplied > sync source's lastApplied in rollback_after_enabling_majority_reads.js
SERVER-53026 Secondary cannot restart replication
SERVER-53345 Excuse arbiter_new_hostname.js from multiversion tests

Query

SERVER-32960 $mod has inconsistent rounding/truncation behavior
SERVER-40361 Reduce memory footprint of plan cache entries
SERVER-50769 server restarted after expr：{"expr":"_currentApplyOps.getArrayLength() > 0","file":"src/mongo/db/pipeline/document_source_change_stream_transform.cpp","line":535}}

Aggregation

SERVER-34741 Move $match in front of $group if condition is on group key
SERVER-40090 DISTINCT_SCAN in agg is only used when certain format of _id is specified
SERVER-51886 $lookup + $merge pipeline may fail to resolve views correctly when collection names collide

Storage

SERVER-47812 Secondaries persist wildcard multikeypaths out of order
SERVER-48471 Hashed indexes may be incorrectly marked multikey and be ineligible as a shard key
SERVER-51858 Investigate queryable issue on 4.0.20
SERVER-52950 recoverOplogAsStandalone mode must not start oplog truncater thread
SERVER-53703 [4.2] Opening a transaction at the all durable timestamp can go backwards

Build and Packaging

SERVER-52891 Run PPC builds less frequently

Internals

SERVER-41836 Log thread ID as part of error in FSM tests
SERVER-43739 SNI name is not set on OSX if allowInvalidHostnames is enabled
SERVER-44375 fix merge_with_drop_shard.js when the curop command fails due to ShardNotFound
SERVER-47863 Initial Sync Progress Metrics
SERVER-48742 Log whenever profiler settings are changed via setProfilingLevel
SERVER-50267 Set output limit for 'rawMongoProgramOutput()'
SERVER-50445 Return the value as double when NumberLong subtraction overflows in ExpressionSubtract
SERVER-51526 Hybrid index builds can miss writes and crash in the event of a well-timed WriteConflictException
SERVER-51607 Upgrade Twisted dependency to at least twisted-19.7.0
SERVER-52618 Sparse hash index should not be used for equality to null match
SERVER-52646 Validate and possibly fix edge cases in regex rewrite rules for userToDNMapping
SERVER-52654 new signing keys not generated by the monitoring-keys-for-HMAC thread
SERVER-52806 deb install files assume systemd
SERVER-52879 Periodic operation latency spikes every 5 minutes due to closing idle cached WT sessions
SERVER-52919 Wire compression not enabled for initial sync
SERVER-52929 Correctly handle compound indexes with 32 keys
SERVER-52969 Disable Powercyle on non-master branches
SERVER-52975 Fix use of 'onRollback' callback for collection validator options in 'collection_impl.cpp'
SERVER-53233 Fix change_streams_update_lookup_shard_metadata_missing.js [4.2, 4.0]
SERVER-53234 jstests/core/profile2.js fails when background operations are run against test database
WT-6835 Add API to allow consolidating incremental backup info
WT-6839 Add API to query existing incremental backup IDs
WT-6882 Files created during incremental backup should be copied in full
WT-6922 Add random consolidate testing to incr_backup

4.2.11 Changelog

Security

SERVER-45938 Allow matching O/OU/DC in client x509 cert if clusterMode:keyFile

Sharding

SERVER-36739 Use the mongos_manual_intervention_action hook in concurrency stepdown suites
SERVER-47616 Improve error when logical sessions cannot have more than one user authenticated on a single connection
SERVER-51808 invariant failure: readConcern level != Available

Replication

SERVER-33747 Arbiter tries to start data replication if cannot find itself in config after restart
SERVER-50116 Forbid oplog writes when replication is enabled
SERVER-50415 Rename waitInIsMaster failpoint to waitInHello
SERVER-50527 Change NotMasterError category to NotPrimaryError

Query

SERVER-51120 Find queries with SORT_MERGE incorrectly sort the results when the collation is specified
SERVER-51853 Always initialize the numInserted out-parameter in AbstractIndexAccessMethod::insertKeys

Write Operations

SERVER-44586 add metrics to serverStatus to track type of update command

Aggregation

SERVER-48523 Unconditionally check the first entry in the oplog when attempting to resume a change stream

Storage

SERVER-43664 Speedup WiredTiger storage engine startup for many tables by optimizing WiredTigerUtil::setTableLogging()

Operations

SERVER-46729 Make Windows shell soft-fail for unavailable OCSP responder
SERVER-51757 Collect /proc/vmstat numa_pages_migrated statistics in FTDC

Build and Packaging

SERVER-46342 DEB installs of MDB do not issue systemctl daemon-reload on install
SERVER-50016 Fail on missing variable customization files

Internals

SERVER-43973 jsTestName() should return a unique name for each thread in the parallel suite
SERVER-45992 InMemory engine startupwarnings confusing
SERVER-46625 Improve diagnostics when mongocryptd requests are sent to non-mongocryptd daemon
SERVER-48078 Remove OpDebug invariant that relies on monotonic clock source
SERVER-48502 Tighten $currentOp and pinned cursor checks in kill_pinned_cursor.js
SERVER-49165 endSessions command in Client.Disconnect causes an authorization failure for an unauthed connection on a host that requires authentication
SERVER-49957 Read out of bounds in getPrevAndNextUUIDs
SERVER-50072 Check _isWindows() when initializing MongoRunner.EXIT_ABORT
SERVER-50123 Record number of physical cores on all platforms
SERVER-50216 Adjust sys-perf frequencies
SERVER-50365 Stuck with long-running transactions that can't be timed out
SERVER-50605 Add {logMessage: "msg"} test-only command
SERVER-50647 Fix OCSP HTTP Client timeout for Windows
SERVER-50736 Make OpenSSL explicitly accept SNIs presented in ClientHello
SERVER-50818 Coverity analysis defect 114987: Wrapper object use after free
SERVER-51004 Disable WT-Develop sys-perf build variants on sys-perf-4.2
SERVER-51058 log_remote_op_wait.js misuses rawMongoProgramOutput
SERVER-51106 Make the isMaster command a derived class of hello
SERVER-51220 Handle auditing attribution in indirect drops
SERVER-51303 Lookup stage followed by $match on type uses wrong field in matching condition
SERVER-51840 Reduce dbtest jobs on 4.2 on Windows debug
TOOLS-2588 [v4.2] sslAllowInvalidHostnames bypass ssl/tls server certification validation entirely
WT-6160 Fix format failure caused by stack overwrite
WT-6507 Exit cache eviction worker after our operation has timed out
WT-6602 Allow operation timeout ms to be passed to commit and rollback
WT-6666 Start op timer when we configure it in rollback and commit

4.2.10 Changelog

Security

SERVER-50463 Make PooledLDAPConnection::refresh take self-ownership

Sharding

SERVER-37422 Log balancer start and stop events in the actionlog
SERVER-48601 ChunkSplitter should use the same chunk bounds for splitVector and splitChunk
SERVER-48679 flushRoutingTableCacheUpdates should block on critical section with kWrite, not kRead
SERVER-50889 migration_failure.js should run setFCV through the router instead of the config server

Replication

SERVER-47263 Inaccurate log message when losing dry run election
SERVER-47645 Must invalidate all sessions on step down
SERVER-48518 Rollback via refetch (EMRC = false) can make readers to see the rolled back data even after the rollback node catches up to primary.
SERVER-48928 Allow primary-elect to complete drain mode even if it is stepping down unconditionally
SERVER-49986 Convert isMaster command to hello and add aliases
SERVER-49987 Rename response fields if “hello” is sent on mongod
SERVER-49988 Rename response fields if "hello" is sent on mongos
SERVER-49989 Add db.hello() shell helper
SERVER-49990 Alias setSlaveOk() and getSlaveOk() shell helpers
SERVER-49991 Alias printSlaveReplicationInfo() shell helper
SERVER-50405 Alias isMaster in mongocryptd and attach appropriate response field
SERVER-50607 Must hold mutex when calling _checkForShutdownAndConvertStatus_inlock
SERVER-50626 Race in read_concern_majority_getmore_secondaries.js
SERVER-50640 listCommands should return "isMaster" alias in addition to "hello" command name

Query

SERVER-47469 applyOps does not take exclusive lock for views operation
SERVER-50291 Add query knob to enumerate $or children in a different order

Aggregation

SERVER-31368 Log time spent waiting for other shards in merge cursors aggregation stage
SERVER-40317 $facet execution has no limit on how much memory it can consume

Operations

SERVER-26726 Check number of arguments for createIndex() and throw error if more than two arguments

Build and Packaging

SERVER-23668 scons abbreviated options do not work properly
SERVER-44632 Platform Support: Remove Community zSeries from 4.2
SERVER-47138 MSI installer produces incorrect config file
SERVER-50078 Compile bypass applied when it should not have

Internals

SERVER-42852 buildStages() STAGE_SHARDING_FILTER block should hold child stage tree by unique_ptr
SERVER-43233 Add ability to request only specific attribute(s) for the LDAP groups
SERVER-45202 Improve Command alias infrastructure
SERVER-47428 Move concurrency_sharded* Evergreen tasks to -large distros
SERVER-48048 Use resmoke tag files for multiversion blacklisting
SERVER-48410 Signed integer overflow fix for datetime library
SERVER-48709 signing key generator thread on config server not waken up as expected
SERVER-49054 Server MSI should install Compass instead of Compass Community
SERVER-49438 Allow memory.js tests to accept $where timeout interruption
SERVER-49766 Indexed and non-indexed collections return different results for null query
SERVER-49786 Freeze DSI and Genny for non-master perf projects
SERVER-49922 Make schema_validator_with_expr_variables.js less heavy
SERVER-50183 Copy _awaitPrimaryAppliedSurpassesRollbackApplied function from RollbackTest to RollbackTestDeluxe
SERVER-50326 Restrict sharding in agg_out.js workload to a single thread
SERVER-50394 mongod audit log attributes DDL operations to the __system user in a sharded environment
SERVER-50403 Build server on combined visual studio image
SERVER-50760 [v4.2] Switch MultiOplogEntrySyncTailTest to use wiredTiger
SERVER-50822 [4.2] dont_read_oplog_hole_on_step_up.js should wait for all nodes to agree on a primary
SERVER-51041 Throttle starting transactions for secondary reads
WT-6000 Enhance incremental backup testing in format to support restart
WT-6215 Clear backup block information on rename: Reverted
WT-6421 Avoid parsing metadata checkpoint for clean files
WT-6539 Fix backup and rename memory leak
WT-6559 Use the session ID from the new session to determine statistics bucket
WT-6598 Add new API allowing changing dhandle hash bucket size
WT-6610 Fix incremental backup checkpoint parsing to handle upgrades
WT-6611 Revert enhancement allowing rename and incremental backup

4.2.9 Changelog

Security

SERVER-47733 SymmetricEncryptorWindows shouldn't pad when update is called

Sharding

SERVER-40441 Arbiter nodes log error messages when try to create session collection or check if it exists
SERVER-46194 Applying transfer mods in a migration does not handle write conflicts
SERVER-48096 PeriodicShardedIndexConsistencyChecker thread on jstests can cause unintended shard refreshes
SERVER-48229 Shutdown PeriodicShardedIndexConsistencyChecker after ReplicationCoordinator so no thread will try to pause the job after it has stopped
SERVER-48491 Add requires_document_locking tag to sessions_collection_reaping.js
SERVER-48674 Check if replication is enabled before checking if the node is an arbiter in LogicalSessionCacheImpl
SERVER-48926 Fix remaining sharding tests that incorrectly set votes to 0 on shard secondaries
SERVER-49233 Introduce a flag to toggle the logic for bumping collection's major version during split
SERVER-49311 PeriodicShardedIndexConsistencyChecker might cause failures on stale_mongos_and_restarted_shards_agree_on_shard_version.js

Replication

SERVER-44779 Invariant internal operations that hit a prepareConflict must be marked killable
SERVER-45610 Some reads work while system is RECOVERING
SERVER-47849 Add more logging to shutdownTask
SERVER-48525 Forbid dropping config.transactions when there are prepared transactions
SERVER-48527 Aborting in-progress transactions on step-up should clear session state before returning
SERVER-48576 Fix the election race in change_stream_stepdown.js
SERVER-48611 speculative_majority_find.js should call awaitLastOpCommitted before running majority read that is expected to succeed
SERVER-48712 Race in write_concern_after_stepdown.js
SERVER-48778 Make reconstruct_prepared_transactions_initial_sync.js robust to election failures.
SERVER-48967 Prevent replicated writes on empty namespaces on secondaries
SERVER-48979 Race between config propagation and election in change_stream_stepdown.js
SERVER-49471 Retry on WT_ROLLBACK when applying prepareTransaction oplog entry
SERVER-50039 Timing error in dbadmin.js test

Query

SERVER-35921 Index scan uses incorrect bounds for MinKey and MaxKey
SERVER-44273 Failure to parse certain time zone specifications on windows platforms.
SERVER-45233 Indexed inequalities to arrays return incorrect results
SERVER-47223 geoNear/$geoNear does not apply index hints
SERVER-48614 Plan cache key computation for wildcard indexes with partialIndexFilter is incorrect, leading to incorrect query results
SERVER-48950 Enhance explain for $search to expose stats from mongot
SERVER-48993 explodeForSort can produce incorrect query plan
SERVER-49527 recoverFromOplogAsStandalone does not relax index constraints

Catalog

SERVER-47714 Secondary asserts on system.profile collection with WiredTigerRecordStore::insertRecord 95: Operation not supported

Storage

SERVER-44529 Re-acquiring locks after a yield and step down results in wrong parameters on recoveryUnit
SERVER-48274 Remove readOnly mode for queryable restores of encrypted sharded clusters
SERVER-48453 Lazily initialize a record store's auto incrementing counter on deletes
SERVER-48695 setAppliedThrough must set orderedCommit=false on the recovery unit

Operations

SERVER-44051 getShardDistribution() does not report "Collection XYZ is not sharded" on dropped but previously sharded collections
SERVER-48244 Shell should not hard-code the allowed explain levels and let the server reject it instead

Build and Packaging

SERVER-42042 Warn or fail early on dynamic builds with toolchain compiler and tcmalloc
SERVER-46445 MongoDB MSI installer showing irrelevant error message while installing in server configuration window
SERVER-48329 Adjust naming of action_type.h on either master or all stable branches
SERVER-48640 Update RHEL 6.2 AMI for package tests

Internals

SERVER-33229 Overload startParallelShell in auto_retry_on_network_error.js to connect after loading the auto_retry_on_network_error.js override
SERVER-41070 Add blockConnection mode to failCommand
SERVER-43490 Validate if we can perform TODO listed in SERVER-38686
SERVER-46721 Step up may cause reads at PIT with holes after yielding
SERVER-46854 Disable periodic index consistency checker on config servers in jstests/sharding/lookup_mongod_unaware.js
SERVER-47195 Allow failCommand failpoint to trigger only on a specific MongoClient
SERVER-47883 Newly-elected primaries do not wait for single-phase background index builds to complete before accepting writes
SERVER-47930 Ubuntu 20.04 - ldap_authz_authn.js fails to load test certificate
SERVER-48032 Update references of community mailing-lists to MongoDB Developer Community Forums
SERVER-48058 Make sure abort_transactions_on_step_up waits for optime to be applied
SERVER-48067 Reduce memory consumption for unique index builds with large numbers of non-unique keys
SERVER-48107 Retry replSetStepDown in rollback_test.js
SERVER-48514 Separate testing 'called' and 'successful' fields for serverStatus election metrics
SERVER-48532 [4.2] IndexBuildInterceptor::areAllWritesApplied may return false despite all records being visibly applied
SERVER-48568 Use 'nodeOptions' in change_streams_multi_version_transaction.js
SERVER-48569 Add ConflictingOperationInProgress as acceptable error code to stepDown in validateCollectionsCallback
SERVER-48657 Use evergreen module to control signal processing in perf projects
SERVER-48891 nullptr dereference on ViewCatalog in reIndex when Database does not exist
SERVER-48907 Allow users to patch test changes to linkbench/linkbench2 using evergreen set-module
SERVER-49007 Roundtrip registration ID in metrics response in mock_http_server.py
SERVER-49071 Make ldap_fastest_host_selection.js tolerate missing LDAP servers in statistics
SERVER-49097 sys-perf builds differ from release builds
SERVER-49142 Validate correct field name in RoleName::parseFromBSON()
SERVER-49335 publish_packages should use barque API key
SERVER-49404 Enforce additional checks in $arrayToObject
SERVER-49690 Retry "CappedPositionLost" when searching for old oplog entries
SERVER-49704 txn_being_applied_to_secondary_cannot_be_killed.js should not allow elections
SERVER-50173 [v4.4] Remove explode_for_sort_collation.js from backports list of test suite sharding_multiversion
WT-6261 Turn off incremental backup rename testing
WT-6319 Fix for corrupted encrypted item: padded size less than actual size
WT-6480 Fix a bug where files without block modification information were repeatedly copied at each incremental backup
WT-6495 Refactor test_backup16.py

4.2.8 Changelog

Sharding

SERVER-40441 Arbiter nodes log error messages when try to create session collection or check if it exists
SERVER-45554 Un-blacklist core/txns from sharding test suites
SERVER-47799 AsyncRequestsSender should update replica set monitor in between retries for InterruptedAtShutdown
SERVER-47913 Redact sharding messages in split chunk and distributed lock acquisition
SERVER-48307 Transactions that write to exactly one shard and read from one or more other shards may incorrectly indicate failure on retry after successful commit
SERVER-48491 Add requires_document_locking tag to sessions_collection_reaping.js
SERVER-48674 Check if replication is enabled before checking if the node is an arbiter in LogicalSessionCacheImpl

Replication

SERVER-46496 Retry on exceptions in reconfig_add_remove_arbiter.js
SERVER-46897 REMOVED node may never send heartbeat to fetch newest config
SERVER-47528 Presence of initialSyncStatus in replSetGetStatus consumes too much FTDC space
SERVER-47879 Should read from primary in rollback_reconstructs_transactions_prepared_before_stable
SERVER-48101 Use "j:true" when persistence is enabled in optime.js
SERVER-48250 Wait for hang in majority write before stepping down primary in write_concern_after_stepdown_and_stepup.js
SERVER-48276 ReplSet Free Monitoring URLs inconsistent
SERVER-48371 transactions_during_step_down.js must abort transaction in the shell
SERVER-48541 Fix log output on rollback of fcv document

Query

SERVER-47209 change_streams_update_lookup_shard_metadata_missing.js should handle the node the change stream cursor was established on going through rollback
SERVER-47773 geoNear invariant on mongos
SERVER-47994 Fix for numerical overflow in GeoHash

Storage

SERVER-43097 Improve log messaging when index builds get foregrounded because of startup recovery
SERVER-45570 Add a ProgressMeter to the index build startup recovery code path
SERVER-48384 Make PeriodicJob stop before TimestampMonitor destroy its members

Operations

SERVER-44051 getShardDistribution() does not report "Collection XYZ is not sharded" on dropped but previously sharded collections
SERVER-46189 shell hang with message "Missing ssl modes with a single replica set is disallowed

Build and Packaging

SERVER-48640 Update RHEL 6.2 AMI for package tests
SERVER-48659 Update SLES 12 AMI for package tests

Internals

SERVER-46758 setFCV can be interrupted before an FCV change is majority committed and rollback the FCV without running the setFCV server logic
SERVER-47187 Add startup warning when SeIncreaseWorkingSetPrivilege not present
SERVER-47256 Update listed maintainer for repo package files
SERVER-47611 Re-work to_local_args function using argparse
SERVER-47798 Audit isMaster response validation for mongod and mongos
SERVER-47877 Some replsets tests use arrayEq without assert
SERVER-48346 Fix lifetime issues for barriers captured by reference
SERVER-48369 Fix prepare_conflict.js to use write concern "majority" when creating an index
SERVER-48657 Use evergreen module to control signal processing in perf projects
TOOLS-2562 [v4.2] Oplog replay can't handle entries > 16 MB
TOOLS-2586 [v4.2] Write location not correctly set
WT-6366 Off-by-one overflow in block-modification bitmaps for incremental backup

4.2.7 Changelog

Security

SERVER-45514 [FLE] Reject document validators with encryption-related keywords if the validationAction is "warn"
SERVER-48039 Unrecognized option: net.ssl.clusterCertificateSelector in MongoDB v4.2

Sharding

SERVER-42632 Disable pinger threads that reach out to config server to make integration tests pass
SERVER-42772 race between TransactionCoordinatorService::joinPreviousRound and coordinator destruction can trigger invariant
SERVER-43100 Remove CoordinateCommitReturnsNoneIfCoordinatorWasRemoved unit test
SERVER-45009 Transaction coordinator tasks should be robust to shutdown failing to step down
SERVER-46396 Add metrics to track number of operations blocked behind a catalog cache refresh
SERVER-46487 The mongos routing for scatter/gather ops can have unbounded latency
SERVER-47481 Set minNumChunksForSessionsCollection to 1 on the CSRS in ShardedClusterFixture-based suites
SERVER-47745 Make chunk query in ShardingCatalogManager compatible with chunks created in 3.4
SERVER-47999 balance_repl.js should ensure writes have replicated before attempting to read them from a secondary

Replication

SERVER-38731 Ability to specify sync source read preference in initial sync
SERVER-47190 Shutdown command with force:true should ignore all stepdown errors
SERVER-47613 Invariant in processReplSetRequestVotes
SERVER-47622 replSetReconfig.js should check ismaster before running the reconfig command
SERVER-47695 Write commands run by threads that can survive rollback can fail operationTime invariant in ServiceEntryPoint
SERVER-48046 {replSetFreeze: 0} done in RollbackTest.restartNode() should be resilient of network errors

Query

SERVER-46810 Broken E11000 duplicate key error when unique index contains collation

Aggregation

SERVER-46819 Allow transactions in change stream sharded passthroughs
SERVER-47581 mongoS does not set 'useNewUpsert' on $mergeCursors pipelines [4.4, 4.2]

Storage

SERVER-44577 Ensure WiredTiger cursors have started a transaction before reading data
SERVER-46398 Suggest explicit dbpath when starting mongod on macOS and the default dbpath isn't found
SERVER-46699 Report the oplog visibility timestamp in FTDC
SERVER-47462 Remove 'SetIndexCommitQuorum' command support from mongoDB 4.2

Operations

SERVER-45295 Make sure that LDAP logs always contain context on AuthZN operation
SERVER-47553 mongos crashes due to client disconnecting when signing keys being refreshed

Build and Packaging

SERVER-44072 Platform Support: Add Enterprise RHEL 8 PPC
SERVER-48094 Add RHEL 8.1 to repo_config yaml

Internals

SERVER-42927 Increase verbosity of symbol loading in hang_analyzer.py on Windows
SERVER-43468 Complete TODO listed in SERVER-38690
SERVER-45117 Guard NetworkInterfaceTL::setAlarm() more aggressively
SERVER-45624 Pre-split and distribute chunks of sessions collection
SERVER-46633 Windows TLS implementation may declare hostname mismatch on unrelated error
SERVER-46684 Repackage the hang-analyzer as a resmoke subcommand
SERVER-46769 Migrate from optparse to argparse
SERVER-46841 Make PeriodicRunner interrupt blocked operations on stop
SERVER-47056 Do not use readOnce cursors for collection scan in initial sync
SERVER-47063 Upgrade static OpenSSL to 1.1.1e
SERVER-47071 CheckReplOplogs can fail to detect a mismatch
SERVER-47264 Backport DocumentSourceBucketAuto::optimize() function to 4.2
SERVER-47351 Better synchronize NetworkInterfaceTL shutdown with in-flight commands
SERVER-47373 Improve handling of empty TLS packets
SERVER-47429 authenticationMechanisms parameter is not validated
SERVER-47475 Make PeriodicJob aware of cancelation at global shutdown
SERVER-47507 Cancel all remaining egress commands on shutdown
SERVER-47623 Fix use-diagnostic-latches=off on v4.2
SERVER-47633 Add uses_transactions tag to index_build_yield_prepare_conflicts.js
SERVER-47634 Make metric tests in stepup.js more robust
SERVER-47668 Update FCV documentation links to 4.2 in feature_compatibility_version_documentation.h
SERVER-47685 Remove fetch_and_build_openssl.sh from master branch
SERVER-47893 Add test confirming that variables defined above a $graphLookup are available for use
SERVER-47919 Don't expose --suite option in find-suites; use set_default instead
SERVER-47940 Add space between resmoke.py and run in powertest
SERVER-48005 Reduce parallelism on Ubuntu 1804 ARM
TOOLS-2526 [v4.2] mongorestore may incorrectly validate index name length before calling createIndexes
TOOLS-2532 [v4.2] mongorestore hangs on invalid archive
WT-4954 Document duplicate backup cursors
WT-5212 Backup data validation tests
WT-5214 Verify potential incremental failures
WT-5246 Update WiredTiger backup documentation
WT-5589 force_stop on duplicate cursor open not returning error
WT-5624 Incremental unit test should use offset/length ranges
WT-5695 Fixed incremental backup example to use O_CREAT in the backup range case
WT-5697 Dropping or renaming tables returns EBUSY in incremental backup test
WT-5699 Refactor incremental backup RANGE code
WT-5719 Incremental backup metadata should quote the ID string
WT-5722 Incremental backup should do a name check on identifiers
WT-5834 Incremental backup returning too large offset
WT-5914 Only configure log-incremental backup if archiving is off in test/format
WT-5989 Support arguments in workgen
WT-5999 Update format so it's possible for it to restart on an existing database

4.2.6 Changelog

Security

SERVER-45803 mongodecrypt needs a ServiceContext
SERVER-46834 Use monotonic time in UserCacheInvalidator
SERVER-47113 LDAP connection pool acquisition state should own host list

Sharding

SERVER-29153 Make sure replica set nodes agree on which node is primary before doing writes in ShardingTest initialization
SERVER-32871 ReplicaSetMonitorRemoved and ShardNotFound errors on fanout query after removing a shard
SERVER-41278 FSM killSession helper should not kill sessions being run by background hooks
SERVER-41777 Make multi_mongos2.js awaitReplication after sharding a collection
SERVER-42304 Load causal consistency override in sharded_collections_causally_consistent_jscore_txns_passthrough
SERVER-42827 Allow sessions collection to return OK for creating indexes if at least one shard returns OK and others return CannotImplicitlyCreateCollection
SERVER-42862 Prevent shard refreshes in mergeChunks command from joining earlier refreshes
SERVER-43848 find/update/delete w/o shard key predicate under txn with snapshot read can miss documents
SERVER-44115 Exclude jstests/core/autocomplete.js from sharded jscore tests
SERVER-44463 insertConfigDocumentsAsRetryableWrite() incorrectly calculates BSON array overhead
SERVER-45119 CollectionShardingState::getCurrentShardVersionIfKnown returns collection version instead of shard version
SERVER-45389 Add metrics tracking how often shards have inconsistent indexes
SERVER-45910 Router might target wrong shard on write operation for unsharded collection
SERVER-46084 Don't use $setUnion in aggregation for finding inconsistent sharded indexes
SERVER-46307 database_versioning_safe_secondary_reads.js should not set "votes: 0" on the shard secondaries
SERVER-46942 State information can be leaked if server closes too quickly on network_interface_tl
SERVER-47436 Make shards validate shardKey in dataSize command

Replication

SERVER-33627 Initial syncer needs to handle exception
SERVER-35437 Wait for secondary state after stepdown command in multi_rs.js
SERVER-46517 Stepdown changes the underlying state of canAcceptWrites() out of RSTL X mode
SERVER-47109 Race in replset1.js from two-phase index build

Query

SERVER-40805 Indicate the reason for replanning in the log file
SERVER-45147 "Ghost" timestamp must set transaction to unordered
SERVER-46872 yield_with_drop.js FSM workload should permit upserts to fail with NoProgressMade

Write Operations

SERVER-47233 WriteOp can be left in pending state, leading to erroneous NoProgressMade write error from mongos

Aggregation

SERVER-44689 Add serverStatus counter for each use of an aggregation stage in a user's request

Storage

SERVER-44507 Hybrid index build is able to commit (acquire stronger mode locks) for a collection that contains prepared documents. (4.2 only)
SERVER-46468 The validate command may generate overlong responses
SERVER-46865 collMod should not take database MODE_X lock
SERVER-47006 Implement a downgrade floor between 4.4 and 4.2
SERVER-47425 When 4.2 discovers log version 4 records on startup, continue to write log version 4 records

Operations

SERVER-44892 getShardDistribution should use $collStats agg stage instead of collStats command
SERVER-46024 Collect /proc/vmstat swap statistics in FTDC

Build and Packaging

SERVER-43231 Add support for releasing mqlrun artifacts for certain Ubuntu LTS versions
SERVER-46996 all push/publish_packages tasks should run on small hosts

Internals

SERVER-15902 use signal handling stack via sigaltstack to improve behavior on stack overflow
SERVER-38119 Windows dump file naming does not account for dots in directory names
SERVER-39241 Plan scoring incorrectly applies noFetchBonus bonus to all plans when no projection is provided
SERVER-41160 Add shutdown method for CatalogCacheLoader
SERVER-42278 Log SockAddrs produced during LDAP connection establishment with manually derived sizes
SERVER-42455 ReplicaSetChangeNotifier::onConfirmedSet is unsafe during shutdown
SERVER-42525 Single-node replica sets shouldn't wait for electable caught up secondaries during shutdown
SERVER-43011 Add optional namespace restriction to failCommand failpoint
SERVER-43732 burn_in_tests did not detect changes in core
SERVER-43889 Distinguish between a retryable write and a transaction when failing a command
SERVER-45143 Missing expected field "protocolVersion", but that field has a default value
SERVER-45334 Service Name not respected in MSI Installer
SERVER-45508 Invariant failure in getFieldsWithStringBounds with descending point ranges
SERVER-45525 ReplBatcher should explicitly read at kNoTimestamp
SERVER-45835 Add optimized Linkbench to Sys-perf as a new task
SERVER-45881 Investigate and implement desired Flow Control throttling for multi-document transactions
SERVER-46135 Create selected_tests alias
SERVER-46362 Make set_step_params test tolerate sporadic connections
SERVER-46410 Validate should check for duplicate keys in unique indexes
SERVER-46439 Add acceptance tests for burn_in_tags
SERVER-46501 Add /proc/self/mountinfo to hostInfo response
SERVER-46851 Decrease the number of jobs in logical session cache tests
SERVER-46861 Update perf.yml to use the updated genny invocation
SERVER-46980 Add multiversion* expansions to Enterprise RHEL 7.0 builder in v4.2
SERVER-47080 Enable verbose logging for LDAP tests
SERVER-47114 Make ldapproxy.py use IOCP on Windows
SERVER-47174 mozjs third party code folder is ignored by git
SERVER-47193 createIndexes command accepts "commitQuorum" option on 4.2 servers
SERVER-47384 Remove TODO comment for SERVER-41070
SERVER-47407 Avoid WriteUnitOfWork in index build collection scan loop
WT-5669 Prepare support with durable history: backport data format changes to 4.2
WT-5866 Remove history store file when downgrading to 4.2
WT-5892 Bump log/WT version to facilitate downgrade floor for MongoDB 4.2
WT-5934 Stop validating timestamps read from disk in 4.2
WT-5966 4.4 downgrade can result in 4.2 core dumps if cells are ignored

4.2.5 Changelog

Sharding

SERVER-45770 Add to information contained in logfile about "moveChunk.to"

Storage

SERVER-46858 [4.2] Start WT in read only mode if the 'recoverToOplogTimestamp' flag is missing for queryable backup

Build and Packaging

SERVER-46983 Upload repobuilding packages to correct URL

Internals

SERVER-45043 Fix SSL test failure on Ubuntu
SERVER-45156 SockAddr constructor should take sockaddr, not sockaddr_storage
SERVER-46126 LDAP proxy and mongod startup race in ldap_insuffcient_access_rights.js
SERVER-46630 RemoveSaver writes GCM tag to incorrect file position
SERVER-46746 Add sysbench large scale workload to sys-perf for durable history testing
SERVER-46754 Use new repobuilder service
SERVER-46766 Teardown clusters after every perf run

4.2.4 Changelog

Sharding

SERVER-42617 Race in CloneDocumentsCatchesInsertErrors can causes it to return an unexpected error
SERVER-44103 clear_jumbo.js should wait for balancer to be on mode: full for more than one round
SERVER-44130 Flip order of assert.lte arguments in logical_time_metadata.js
SERVER-44839 Frequent schema changes in mongos ftdc metrics limits retention period
SERVER-44915 Extend $indexStats output to include full index options and shard name
SERVER-45273 Remove the mongos version check in allow_partial_results.js and return_partial_shards_down.js
SERVER-46001 Move checkShardingIndex outside shardCollection's read critical section on the primary shard
SERVER-46121 mongos crashes with invariant error after changing taskExecutorPoolSize

Replication

SERVER-34768 Rollback can fail if run against a lagged node that catches up
SERVER-35050 Don't abort collection clone due to negative document count
SERVER-38028 Participant with prepared transaction on session should block request for higher txn number on session rather than failing the new request
SERVER-39112 Primary drain mode can be unnecessarily slow
SERVER-43867 Work around unrecoverability of rollback via refetch in tests
SERVER-44260 Transaction can conflict with previous transaction on the session if the all committed point is held back
SERVER-45010 Clean shutdown after rollbackViaRefetch with eMRC=false can cause us to incorrectly overwrite unstable checkpoints
SERVER-45178 Rollback via refetch can cause rollback to happen successfully w/o updating the rollback id.
SERVER-45421 Fix transactions_block_ddl.js to use write concern "majority" for commands run as part of setup phase.
SERVER-45492 Tag rollback_dup_ids.js with 'requires_persistence' and 'requires_journaling'
SERVER-45493 temporarily disable failing assertion in election_candidate_and_participant_metrics.js
SERVER-45612 Remove the mapReduce + prepare testing in 4.2 concurrency_simultaneous_replication suite
SERVER-45839 recoverFromOplogUpTo should not invariant if there are no oplog entries to apply between the given range
SERVER-45840 Blacklist tests that run emptycapped from replica_sets_kill_secondaries_jscore_passthrough
SERVER-45842 Remove assertion that checks whether the last applied oplog entry has the same timestamp as the requested recover timestamp in recoverFromOplogUpTo
SERVER-45906 Initial stable checkpoint not triggered properly when enableMajorityReadConcern=false
SERVER-46050 Use getLastAppliedOpTime rather than getHeartbeatAppliedOpTime for checking primary's position
SERVER-46188 Blacklist write_conflicts_with_non_txns.js from sharded transaction passthrough suites due to maxTimeMS incompatibility
SERVER-46218 Race between removal and shutdown in arbiter

Query

SERVER-32903 Ambiguous field name error should be ignored during initial sync
SERVER-45279 GranularityRounder can get stuck in loop when rounding infinity
SERVER-45363 Issue with mongodb text indexes and weights when using wildcard specifier
SERVER-45927 Alias for Atlas FTS

Write Operations

SERVER-45611 Lazily enforce that persisted collection validators are well formed

Aggregation

SERVER-40603 Perform more thorough review/audit of new mongohouse DocumentSources
SERVER-44942 $out will hit invariant if temp collection is dropped before indexes are copied from source collection
SERVER-45418 DocumentSourceCursor batching memory accounting does not account for empty documents, leads to unbounded memory use for count-like aggregates

Catalog

SERVER-45137 Increasing memory allocation in Top::record with high rate of collection creates and drops

Storage

SERVER-41968 IndexBuildTest.getIndexBuildOpId() not selective enough when IndexBuildsCoordinator is enabled
SERVER-42830 Applying a rename operation can result in multiple WT transactions
SERVER-43794 Change MongoDB backup cursor API to include offset/length ranges
SERVER-44370 Have openBackupCursor accept inputs for incremental backup requests
SERVER-44406 Add $backupCursor API to forcefully disable incremental backups
SERVER-44407 Connect the incremental backup cursor pipes with WT output.
SERVER-44410 Change backup cursor results to include a filesize
SERVER-44426 Have queryable backup mode forward FS write calls to the backend API
SERVER-44433 Have queryable backup mode forward file opening/creation calls to the backend API
SERVER-44438 Have queryableBackupMode open WT in read/write mode
SERVER-44442 Allow queryableBackupMode to perform replication recovery
SERVER-45006 LockerImpl::wasGlobalLockTaken() always returns true
SERVER-45007 PBWM acquisition in GlobalLock constructor ignores deadline
SERVER-45288 switch Idempotency tests to use WiredTiger instead of ephemeralForTest
SERVER-45289 Conditional jump or move depends on uninitialised value(s) in validate_adaptor.cpp
SERVER-45374 Unique index that gets rebuilt as part of startup recovery/repair is using data format version as 6 or 8 and NOT 11 or 12.
SERVER-45481 Change the backup API to return the blocks to copy for incremental backup
SERVER-45581 Change the incremental backup API to allow block size granularity to be specified
SERVER-45660 Remove blockSize from queryable backup
SERVER-45663 Implement file renaming for queryableBackupMode and fix file size tracking
SERVER-45821 Re-enable disabled incremental backup cursor tests and add additional tests
SERVER-46010 Incremental backups should remain viable across replication rollback on the backup source
SERVER-46366 Append the backup cursors user arguments to the metadata document
SERVER-46375 Include the offset, length pair for files as part of the first full backup for incremental
SERVER-46488 queryableBackupMode should recover from the journal files on startup using the recovery timestamp
SERVER-46565 Extend ESE backup tests to use $extendBackupCursor

Operations

SERVER-45662 Flow Control currentOp timeAcquiringMicros stat is no longer updated

Build and Packaging

SERVER-45713 Run rhel7 push and publish tasks on large rhel70 distro
SERVER-45732 Filter flags from net-snmp-config invocation more aggressively
SERVER-45879 No Builds Produced for s390x Ubuntu 18.04 for 4.2.3
SERVER-45922 Build failure in overflow_arithmetic.h: constexpr function never produces a constant expression

Tools

TOOLS-2430 mongorestore: in dotted index keys, replace "hashed" with "1"

Internals

SERVER-37148 Remove mr_shard_version.js and mr_during_migrate.js in favor of MR FSM test
SERVER-41872 PlanEnumerator AndAssignment::choices ordering not stable and is relevant to set of plans generated
SERVER-42930 ConnectionPool controller updates must batch across hosts
SERVER-43308 Invariant failure in mqlrun: doc.value().isOwned()
SERVER-43339 PBWM locks acquired part of GlobalLock::GlobalLock() should be interruptible. Else, it won't respect MaxTimeMS.
SERVER-43470 Complete TODO listed in SERVER-35156
SERVER-43726 Make ssl_alert_reporting.js tolerate LEGACY crypto policy on RHEL8
SERVER-43763 Figure out if global LDAP synchronization can be disabled when libldap is built with OpenSSL.
SERVER-43971 MQLRUN crashes if pipeline is specified in file
SERVER-44325 Add polyfill for certificate chain verification
SERVER-44435 Allow x509 authorization to be selectively enabled based on the CA
SERVER-44620 Fix sslProviderSupports helpers on Debian 10
SERVER-44853 MSI Should skip install MongoD service dialog when mongod is not selected to be installed
SERVER-44904 Startup recovery should not delete corrupt documents while rebuilding unfinished indexes
SERVER-45261 create more state in NiTL ctor
SERVER-45486 Add information to debug index key count mismatch issue in 'hashed_index_bad_keys_cleanup.js'
SERVER-45544 burn_in_tests for certain tests can time out regardless of what changed
SERVER-45546 Do not create HostPools for passive members
SERVER-45644 Reevaluate timeouts used by burn_in_test
SERVER-45726 Allow empty firstBatch with TaskExecutorCursor
SERVER-45748 burn_in_tags_bypass_compile is not looking at the correct task
SERVER-45764 Generate resmoke tasks need to take setup time into account when setting timeouts
SERVER-45766 Remove "requires" from the server yaml
SERVER-45825 Disable tool_replset for ephemeralForTest storage engine
SERVER-45867 Use latest version of signal processing
SERVER-46003 Send "search" internally from mongod to mongot instead of "searchBeta"
SERVER-46082 Use bin/analysis.py for performance projects
SERVER-46174 Free peer certificate in SSL_get0_verified_chain polyfill
SERVER-46197 Make build flag to disable diagnostic latches
TOOLS-2461 Backport mongorestore hashed index fix to 4.2
WT-4886 Avoid depending on particular error message text for test_bug018
WT-4968 Remove all_committed timestamp
WT-4999 Migrate Jenkins “wiredtiger-test-format-stress-zseries” job to Evergreen
WT-5003 Migrate Jenkins “wiredtiger-test-race-condition-stress-sanitizer” job to Evergreen
WT-5024 Migrate Jenkins “wiredtiger-compatibility” job to Evergreen
WT-5041 Distribute modifications properly in test_calc_modify.py
WT-5081 Add support for ASan builds in the Python test suite
WT-5119 Birthmark records can be read as normal updates if reads race with checkpoints
WT-5159 Make wiredtiger work with SWIG 4.0.0 beyond
WT-5165 Add cursor copy debug mode
WT-5192 Don't allow checkpoints to evict without a snapshot
WT-5199 Adding correctness tasks into rhel80 Evergreen build variant
WT-5206 Return the correct checkpoint-modified list of blocks
WT-5235 Craft a workload to show lookaside contention
WT-5255 Turn off external programs if direct I/O is configured for test/format
WT-5261 coverage-report task timed out in Evergreen
WT-5334 Add testing coverage for static wt build
WT-5366 read-committed and read-uncommitted transactions can stall eviction
WT-5371 Fix test_stat08.py assertion failure
WT-5372 Skip known errors for long-running format stress sanitizer tasks
WT-5376 WT_UPDATE.type field can race with visibility checks when returning key/value pairs
WT-5377 variable-length column store insert locking in format test program can stall eviction
WT-5379 Missing varargs cleanup
WT-5380 Stat clear is not clearing the proper lookaside cursor stats
WT-5387 Prepared transaction resolution can stall eviction on active pages
WT-5393 Prepared transaction rollback and API error handling fixes
WT-5395 Fix a bug in the read lock implementation when there is a lot of contention
WT-5398 Adding more correctness tasks into rhel80 Evergreen build variant
WT-5405 Make format LSM test a separate Evergreen task
WT-5410 WiredTiger formatted timestamp string buffer size is too small
WT-5437 Salvage's excessive consumption of cache memory causing eviction to stall
WT-5440 __wt_txn_clear_read_timestamp() has an unnecessary serialization point
WT-5442 Fix failure in test_shared_cache01.py
WT-5443 Disable PPC format tests in Evergreen
WT-5444 Re-enable PPC format tests in Evergreen
WT-5445 Handle relative "home" directories in format.sh
WT-5449 Increase contention in history store stress workload
WT-5450 Support timeout setting for long-running operations in test/format
WT-5458 Fix Evergreen timeout failures in linux-directio test
WT-5460 Buffer alignment failure captured by linux-directio test
WT-5468 Improve documentation for "wt load"
WT-5480 Don't take threads resolving prepared transactions to assist with eviction
WT-5488 Dump the failing CONFIG for Evergreen test/format tasks
WT-5521 Cache stuck during format initial load, configured with library checkpoints
WT-5534 Incremental backup needs to accept older metadata
WT-5536 Add zstd as a builtin compressor for WiredTiger Python package
WT-5537 Use correct WT_ITEM fields per memory sanitizer
WT-5538 Change format to ignore Evergreen timestamps in configuration files
WT-5553 Return error if primary cursor is not an incremental source
WT-5554 Account for logpath when retrieving file size in incremental backup
WT-5564 Buffer not extended properly when incremental bitstring grows
WT-5584 Change format to ignore Evergreen timestamps in configuration files
WT-5587 Limit how many checkpoints are dropped by a subsequent checkpoint

4.2.3 Changelog

Security

SERVER-44922 User acquisition shouldn't increment cache generation
SERVER-45309 Ensure bind credentials live longer than LDAP operations

Sharding

SERVER-33597 Make allow_partial_results.js, return_partial_shards_down.js start shards as replica sets
SERVER-40435 A clearJumboChunk command to clear the jumbo flag
SERVER-42914 Implement random chunk selection policy for balancer for use in concurrency_*_with_balancer workloads
SERVER-43195 Add namespace to ChunkManager ShardKeyNotFound failure in order to better diagnose failures.
SERVER-43960 sharding_balance4.js should wait for ongoing chunk splits between updates
SERVER-44341 Do not choose only first shard of all shards associated with a zone when pre-splitting during shard collection
SERVER-44598 Shards do not treat the IGNORED version as "intended sharded"
SERVER-45100 Make the BatchWriteExecutor retry multi-writes only against unsuccessful shards
SERVER-45272 Remove assertions about the last-stable behavior in allow_partial_results.js and return_partial_shards_down.js

Replication

SERVER-35407 ReplicationCoordinatorExternalState and data replication must not be started after shutdown
SERVER-37390 RollbackTestFixture doesn't need to wait for a new primary if it didn't shut down the current primary
SERVER-42825 Log metrics.repl.stepDown counters after stopped killing user operations as part of state transition (step up/ step down).
SERVER-43875 Initial sync may crash due to missing oplog entries of running transactions
SERVER-43978 Stable timestamp is not being recalculated after aborting oplog holes
SERVER-44061 Race while setting replication maintenance mode.
SERVER-44503 Race in replsets/auth2.js
SERVER-45155 Write the temp file of rollback file dump in the test's db directory
SERVER-45270 Increased vulnerability to slow DNS
SERVER-45350 Use awaitMajorityCommitted in standalone_replication_recovery_idempotent.js
SERVER-45396 fix the "me" field in isMaster responses when using splithorizon

Query

SERVER-32567 Replace queryoptimizer3.js with FSM test
SERVER-41263 Disallow the empty string as an index key type
SERVER-42565 Aggregations and find commands sort missing fields differently
SERVER-44977 Allow change stream with updateLookup to run directly against a shard mongoD in a sharded cluster
SERVER-44984 Reduce index thread pool size and reduce memory used per build
SERVER-45152 Negation of inequality on array can trip invariant

Aggregation

SERVER-43764 Add more testing for special values in DoubleDoubleSummation
SERVER-44174 $push and $addToSet should restrict memory usage
SERVER-44733 Explicitly return a stream-fatal error in cases where a change stream cannot be automatically resumed
SERVER-44869 Add query knob to control memory limit for $push and $addToSet
SERVER-45177 Not-equal ($ne) in query for mapReduce causes segmentation fault

Storage

SERVER-28977 Coverity analysis defect 101508: Data race condition
SERVER-42183 Check for duplicate namespaces when dumping catalog
SERVER-43018 Formalize contract for safely accessing the catalog
SERVER-43910 include Client/OpCtx information in LockManager::dump() output
SERVER-44619 BtreeKeyGenerator::_extractNextElement() uassert message exceeds 16mb BSON document limit when added to a command result
SERVER-44796 Adjust nojournal startup warning to be more compelling

WiredTiger

SERVER-44991 Performance regression in indexes with keys with common prefixes

Operations

SERVER-44044 Remove unused second parameter from KeyVault.createDataKey()
SERVER-45290 Remove upstream metadata from v4.2's third party library manifest

Build and Packaging

SERVER-44546 Remove mobile specific build and code artifacts
SERVER-44550 Remove mobile specific embedded commands
SERVER-44557 Set an explicit default for the SCons MSVC_VERSION flag
SERVER-45346 Ubuntu 18.04 package testing task fails to install openssl

Tools

TOOLS-1952 Use --forceTableScan by default when running against WiredTiger nodes
TOOLS-2422 admin.tempusers is not dropped by mongorestore
TOOLS-2423 mongorestore does not drop admin.tempusers if it exists in the dump
TOOLS-2425 Backport 'TOOLS-2403 mongorestore hang while replaying last oplog failed in archive mode'
TOOLS-2436 Backport TOOLS-2422 and TOOLS-2423
TOOLS-2451 Backport TOOLS-1952 to 4.2
TOOLS-2453 Index keys not escaped correctly
TOOLS-2454 Backport TOOLS-2453

Internals

SERVER-34844 Relax expectations in apply_batches_totalMillis
SERVER-42573 Only warn about readConcernMajority enabled in primary-secondary-arbiter configuration
SERVER-42631 Blacklist tests that use Mongo.logout() from stepdown suites
SERVER-42697 Expose tcmalloc_release_rate via setParameter
SERVER-43210 jstests/sharding/kill_sessions.js doesn't wait for operation to be killed.
SERVER-43246 Add a log line for when a cursor is reaped due to logical session cleanup
SERVER-43310 mongos tries to connect to the secondary to create the index if rs.slaveOk() is set.
SERVER-43324 Add BasicLockableAdaptor for cleaner function APIs
SERVER-43349 Incorrect serialization for $elemMatch $not $ne
SERVER-43623 Stop catching exceptions in NetworkInterfaceASIO
SERVER-44430 Fix tls_enumerators.py from BF-14793
SERVER-44464 Add new "one-click" genny workload tasks to system_perf.yml
SERVER-44477 Map reduce with mode "merge" to an existing sharded collection may drop and recreate the target if no docs exist on the primary shard
SERVER-44527 Map reduce to an existing sharded collection can incorrectly create new collections on target shards
SERVER-44568 Update the embedded version of the server's timezone data file to tzdb-2019c
SERVER-44595 Linux shutdown of mongod sometimes never completes
SERVER-44775 Make FailPoint::pauseWhileSet increment _timesEntered once
SERVER-44828 Correct logic to re-compute dependencies after absorbing a $sort into query layer
SERVER-44964 [4.2] Calculate index build memory usage per key based on BSONObj buffer capacity, not size
SERVER-45050 Change Windows Kerberos client to use default credentials when no password is specified
SERVER-45180 Use longer retry for kms service
SERVER-45320 Remove evergreen client from buildscripts
SERVER-45472 Ensure RoleGraph can serialize authentication restrictions to BSON
SERVER-45698 Remove Jasper smoke tests from sys-perf
TOOLS-2424 Backport 'TOOLS-1826 mongorestore panic in archive mode when replay oplog failed'
WT-4919 Add debug mode which allocates exact amount of memory in __wt_realloc_def
WT-4921 Add debug mode option that slows checkpoint creation
WT-4969 Remove lsm_merge configuration option
WT-4996 Migrate Jenkins “wiredtiger-test-check-long” job to Evergreen
WT-4997 Migrate Jenkins “wiredtiger-test-format-stress” job to Evergreen
WT-4998 Migrate Jenkins “wiredtiger-test-format-stress-ppc” job to Evergreen
WT-5000 Migrate Jenkins “wiredtiger-test-format-stress-sanitizer” job to Evergreen
WT-5004 Migrate Jenkins “wiredtiger-test-checkpoint-stress” job to Evergreen
WT-5005 Migrate Jenkins “wiredtiger-test-recovery-stress” job to Evergreen
WT-5006 Migrate Jenkins “wiredtiger-test-split-stress” job to Evergreen
WT-5037 Move Application Developer Resources documentation in github to WT documentation
WT-5044 Log more information when timestamp usage issue is encountered
WT-5047 Always return WT_TRY_SALVAGE for corrupted log
WT-5077 Handle ENOENT without failure when copying the directory
WT-5082 Application threads are tasked with eviction even when pinning the oldest transaction ID
WT-5090 Log a message when rolling a thread back because it holds the oldest timestamp
WT-5112 Handling goto labels with multiple words in s_goto.py
WT-5120 Checkpoint hangs when reconciliation doesn't release the eviction generation
WT-5139 WiredTiger incremental backup API
WT-5221 Bypass test_wt2853_perf in Evergreen make-check-msan-test
WT-5232 Create a wrapper script to support format stress tests in Evergreen
WT-5257 Coverity analysis bug: 113971 Dereference after null check
WT-5263 Prepared updates written to the lookaside file are not always read as needed
WT-5274 format.sh must handle core-dump signals and "gdb attach" build mode
WT-5276 test/format needs to move the oldest timestamp forward during bulk load
WT-5277 Cursor key out-of-order detected in the lookaside file
WT-5288 format.sh must distinguish format timeouts and kill child processes
WT-5305 format.sh must handle format's use of the wt utility
WT-5309 Update format.sh script to add prefix command argument
WT-5311 Format timestamps identically to MongoDB
WT-5312 Add thread doing random cursor operations to format's cache size calculation
WT-5314 Avoid loading extensions that have blank name for Python tests
WT-5319 Avoid clearing the saved last-key when no instantiated key
WT-5324 WiredTiger API error handling fixes
WT-5327 Backup cursor API can fail to restore WT_SESSION name information
WT-5330 Read-only transactions are being rolled back in MongoDB
WT-5360 Add a template for building a glossary in developer docs
WT-5365 Remove format's long-running transaction support

4.2.2 Changelog

Security

SERVER-43090 Fix LDAP connection health tests with Okta
SERVER-43640 The user cache invalidator invarianting in it's dtor decreases debuggability
SERVER-43653 Upgrade static OpenSSL to 1.1.1d
SERVER-44320 Allow zoned sharding commands to be authorized via actiontypes

Sharding

SERVER-31083 Allow passing primary shard to "enableSharding" command for a new database
SERVER-39332 Prevent test from dropping collections directly against a shard
SERVER-41480 Increment collection major version on chunk splits/merges
SERVER-42737 MongoDB stuck on update metadata
SERVER-42769 ShardingTest should call awaitLastOpCommitted after enableAutoSplit
SERVER-43337 handle errors that occur on the shard when findAndModify is converted to a transaction.
SERVER-44113 Refresh metadata for correct namespace in transactions_reject_writes_for_moved_chunks.js hashed case
SERVER-44261 Replace waitForFailpoint function with waitForFailPoint command
SERVER-44289 Retryable writes that change shard key value and owning shard that include write concern fail with InvalidOptions
SERVER-44476 Include number of jumbo chunks remaining in output of removeShard

Replication

SERVER-40372 Track transaction size on 4.2+
SERVER-41512 Track metrics associated with a node voting in an election
SERVER-41513 Track the time the new term oplog entry was written by the primary and applied by secondary in replSetStatus on all nodes
SERVER-42025 Prevent Oldest timestamp from advancing in prepare_transaction_read_at_cluster_time.js.
SERVER-42366 When EMRC=false we may set the stable timestamp ahead during rollback after forcing it back to the common point
SERVER-42925 idempotency tests have oplog visiblity issues
SERVER-43239 numCatchUpOps in repSetGetStatus is incorrect
SERVER-43703 Race when disabling rsSyncApplyStop failpoint and stopping server
SERVER-43729 replSetFreeze done part of RollbackTest.transitionToSyncSourceOperationsDuringRollback Should be resilient of errors.
SERVER-43972 initial_sync_capped_index.js should check SECONDARY state before running validate
SERVER-44259 rollback_after_enabling_majority_reads.js test should wait for restarted node to be in SECONDARY state before running stepUp command
SERVER-44373 recover_multiple_prepared_transactions_startup.js test should wait for majority commit point to advance before committing a prepared transaction
SERVER-44457 Update backports_required_for_multiversion.yml on v4.2 with completed list of multiversion test suites
SERVER-44643 Use awaitSecondaryNodes in rollback_after_enabling_majority_reads.js instead of waitForState
SERVER-44675 server_status_metrics.js fails due to racy repl.buffer.count metric in serverStatus

Query

SERVER-43338 [4.2] Dropping an admin.system.* index in FCV 4.0 can invariant on startup
SERVER-44026 Remove global X lock for reIndex
SERVER-44050 Arrays along 'hashed' index key path are not correctly rejected
SERVER-44269 Modernize max_time_ms.js
SERVER-44377 Invariant failure on indexed inequality to null
SERVER-44571 Documents involved in SERVER-44050 corruption scenario cannot be updated or deleted after upgrade
SERVER-44617 $regexFind crash when one of the capture group doesn't match the input but pattern matches

Aggregation

SERVER-43034 Special values handling is inconsistent in DoubleDoubleSummation
SERVER-43860 Pipeline style update in $merge can produce unexpected result

Catalog

SERVER-43402 Secondary oplog can have entry to create a same name but different capitalized database before dropping the old one
SERVER-43880 renameCollection across DBs uses unowned RecordData after cursor has been yielded

Storage

SERVER-33272 The DatabaseHolder::close() function no longer requires a global write lock and neither does the dropDatabase command.
SERVER-43152 remove twoPhaseCreateIndexes test command
SERVER-43882 Building indexes for startup recovery uses unowned RecordData after yielding its cursor
SERVER-43908 Modify IndexConsistency hash-map keys to avoid hitting an invariant on duplicate index keys in KeyString form for different indexes
SERVER-44239 Ensure the parallel shell in lock_stats.js finishes successfully to record the server status properly
SERVER-44612 recoverFromOplogAsStandalone with takeUnstableCheckpointOnShutdown should succeed if retried after a successful attempt
SERVER-44744 Remove antiquated code from queryable_mmapv1 days.
SERVER-44755 Change assertion number in wt_missing_file_errors.js

Operations

SERVER-42886 Fix bypassAutoDecrypt settings in shell
SERVER-43265 Mongo Shell exits with InvalidOptions error when using URI compressors parameter
SERVER-43884 Improve Error Formatting for mongocryptd-origin errors

Build and Packaging

SERVER-44177 Reduce frequency of exotic build variants
SERVER-44392 Platform Support: Remove zSeries ubuntu 16.04
SERVER-44398 Disable multiversion tests on Suse 15
SERVER-44545 Remove builders for Embedded SDKs on Mobile Platforms
SERVER-44579 Pin pywin32 python module
SERVER-44687 error: 'operator delete' is unavailable: introduced in macOS 10.12

Tools

TOOLS-2380 mongodump fails against hidden node with authentication enabled

Internals

SERVER-39165 Add waitForFailpoint command
SERVER-39993 Add kill and terminate versions of concurrency step down suites
SERVER-40667 MongoD Storage watchdog should treat unexpected interruption as process-fatal
SERVER-41140 All usages of MultiIndexBlock should ensure callers check for duplicate key constraints
SERVER-42393 Race in setting failpoint during wt_file_helper.js assertStartInReplSet
SERVER-42576 Decrease the number of concurrent jobs from 4 to 2 in the logical_session_cache_* suites
SERVER-42688 M/R Agg: Fix performance tests to run with valid options on new mapReduce
SERVER-42748 M/R Agg: Support using stored procedures (system.js) in map/reduce arguments
SERVER-42790 Change ConnectionPool's kDiagnosticLogLevel from 3 to 4
SERVER-42818 M/R Agg: ensure mapReduce on a non-materialized view fails with a sensible error message
SERVER-42961 Fix Split Horizon testing on SLES
SERVER-43079 failpoint triggered by LogicalSessionCacheRefresh
SERVER-43085 Regenerate all testing certificates with SHA-256 instead of SHA-1
SERVER-43151 Error in aggregation assertion at value.cpp:1368
SERVER-43213 agg_out_interrupt_cleanup.js shouldn't use inherited 'query' state
SERVER-43319 Increase cursor timeout for 'concurrency_simultaneous' fixtures
SERVER-43576 DBClientRS does not propagate applicationName
SERVER-43577 Ensure ssl exceptions that terminate connections are logged.
SERVER-43579 AWS KMS support needs to be robust to KMS availability
SERVER-43693 Reduce probability of collMods in create_index_background_unique_collmod* workloads
SERVER-43749 Modernize mapReduce tests in core other than those covered by SERVER-42690
SERVER-43843 Skip validate during the rollback fuzzer "restartNode" command
SERVER-43900 Set max_hosts to 1 for stitch_support_lib_build_and_test and embedded_sdk_build_and_test task groups
SERVER-43987 Require predicates with OperationContext::waitForConditionOrInterrupt()
SERVER-44006 Change Packaging License from AGPL to SSPL
SERVER-44009 Upload pip freeze output for sys-perf and microbenchmarks
SERVER-44027 Remove global X lock for renameCollection between DBs
SERVER-44028 Remove global X lock for Cloner
SERVER-44029 Remove global X lock for replSetResizeOplog
SERVER-44064 Perform explicit cast on MessageCompressorManager parameter
SERVER-44119 Fix string coersion in default SetParameter::set(BSONElement) handler
SERVER-44183 Failure to listen on an asio socket should be fatal
SERVER-44287 MR Agg: Relax mapReduce IDL to ignore 'jsMode' option and change mapReduce parser to allow 'nonAtomic: true' and disallow 'out.sharded: false'
SERVER-44310 Make waitForFailPoint command require maxTimeMS
SERVER-44312 Specify evergreen auth in performance tests for signal processing
SERVER-44319 Skip keyfile check in replica_sets/auth1.js on windows
SERVER-44578 Remove unused db_raii and server_status libs from storage_wiredtiger_core's LIBDEPS_PRIVATE
SERVER-44651 Update signal processing version
SERVER-44721 Shell KMS AWS support cannot decrypt responses
SERVER-44727 detect-changes should not be called via run-dsi
SERVER-44868 Initialsync logkeeper and logkeeper-short tests should pass snapshot ID and dataset link respectively to dsi(sys-perf)
WT-4486 Number of syncs did not increase in dirty max test
WT-4565 Fix tree walk code with read-no-wait flag set
WT-4702 Switch to ubuntu1804-test Evergreen distro
WT-4715 Workloads will stall if old transaction or timestamp pinned by thread co-opted for eviction
WT-4961 Checkpoints with cache overflow must keep history for reads
WT-4976 Migrate Jenkins “wiredtiger-pull-request-builds” job to Evergreen
WT-4983 Migrate Jenkins “wiredtiger” job to Evergreen
WT-4987 Migrate Jenkins “wiredtiger-test-checkpoint” job to Evergreen
WT-4988 Migrate Jenkins “wiredtiger-test-unit” job to Evergreen
WT-4989 Migrate Jenkins “wiredtiger-test-unit-long” job to Evergreen
WT-4990 Migrate Jenkins “wiredtiger-test-unit-ppc” job to Evergreen
WT-4991 Migrate Jenkins “wiredtiger-test-unit-zseries” job to Evergreen
WT-4994 Migrate Jenkins “wiredtiger-test-spinlock” job to Evergreen
WT-4995 Migrate Jenkins “wiredtiger-test-wtperf” job to Evergreen
WT-5033 Migrate Jenkins “wiredtiger-test-time-shift-sensitivity” job to Evergreen
WT-5042 Reduce configuration parsing overhead from checkpoints
WT-5048 wiredtiger_open with a corrupted meta file should always return WT_TRY_SALVAGE
WT-5083 Add mips64el support
WT-5106 Remove temporary files in clang-format script
WT-5118 Remove incorrect assert that there are no hazard references to discarded WT_REF
WT-5122 Shut down the sweep server before doing the final checkpoint
WT-5123 Fill multi-paragraph comments
WT-5125 Adding new stats for eviction target strategy
WT-5126 Fix incorrect assertion regarding prepared update resolution
WT-5128 Add script to run wtperf with XRay profiling
WT-5134 Fix leaf-page only search and search-near operations
WT-5135 Change lookaside file inserts to use cursor.insert
WT-5140 Fix where a cursor returning random items can use an uninitialized buffer
WT-5142 Don't create huge root pages when rebalancing or bulk-loading objects with overflow keys
WT-5143 Fix typo in error message
WT-5145 Fix the race condition in accessing pinned_timestamp and connection state
WT-5149 Clear the debugging field value so it cannot get stale
WT-5150 LAS sweep is not removing the entries that are no longer required
WT-5156 Lookaside table cursors not operating at isolation level WT_ISO_READ_UNCOMMITTED
WT-5157 Fix atomics usage in spinlock implementation
WT-5160 Stop requiring a checkpoint before calling rollback_to_stable
WT-5163 Fix ignored failure return in WT_CURSOR.next when random retrieval configured
WT-5164 Fix inconsistent underscore/dash output
WT-5169 WT_REF_LIMBO pages cannot support fast (leaf-page only) searches
WT-5174 Truncation rollback locking is insufficient
WT-5176 Group pull request tasks using Evergreen task tags
WT-5187 Checkpoint error path can attempt to release a hazard pointer that isn't held
WT-5189 Python2: handle errors that occur under the concurrent test option (-j)
WT-5193 Revert LAS dropped table change from WT-5150
WT-5195 Reduce Python unit test build time for Evergreen Windows build variant
WT-5196 Data mismatch failures with test/checkpoint after enabling LAS sweep
WT-5197 Fix sanitizer runtime flags in Evergreen
WT-5204 Add diagnostic logging code to the generation drain function
WT-5207 Minimize WT-5043 diagnostic tests to exclude time other than eviction itself
WT-5211 Print mismatch information before dumping page and LAS
WT-5218 Improve eviction to differentiate between clean and dirty pages with WT_CACHE_EVICT_NOKEEP readgen
WT-5220 Re-enable LAS dropped table change from WT-5150
WT-5239 Fix syscall failure about metadata file open
WT-5247 Ensure that only idempotent modify operations are logged
WT-5251 Increase frequency for Linux syscall test
WT-5252 Fix Ubuntu 18.04 PPC and zSeries unit-test failure in Evergreen

4.2.1 Changelog

Security

SERVER-28011 Support multiple KMIP hosts in the --kmipServerName parameter
SERVER-41277 Create FLE Data Framing Classes
SERVER-42351 RHEL8 TLS 1.0 and TLS 1.1 protocols are disabled in the DEFAULT system-wide cryptographic policy level
SERVER-43243 Reintroduce unused repairDatabase ActionType

Sharding

SERVER-10456 get cursor logic used to find docs to clone (in migration) is not same as in removeRange
SERVER-11328 Allow concurrent draining shards
SERVER-33973 Commands to force cleanup of partial data that might have remained after failed collection/database drop
SERVER-36222 call to ReplSetTest.restart in shard_identity_rollback.js is racy
SERVER-36315 After stepdown the CSRS dist lock manager keeps trying to unlock locks
SERVER-39573 Add unique ID to log label "TransactionCoordinator"
SERVER-39763 transactions_target_at_point_in_time.js should disable expiring old chunk history
SERVER-40258 Relax locking requirements for sharding metadata refresh on shards
SERVER-40496 transactions_snapshot_errors_subsequent_statements.js and transactions_writes_not_retryable.js should not use mode {times: 1} for failpoint
SERVER-40852 mongod_returns_no_cluster_time_without_keys.js should wait for shard primary to load cluster time keys
SERVER-40983 Track and log relevant single transaction metrics on mongos for currentOp
SERVER-41374 Add currentOpen, currentActive, and currentInactive to mongos transactions serverStatus output
SERVER-41376 Track time transactions on mongos are active and inactive and include in slow txn logging
SERVER-41615 Transaction coordinator diagnostics should handle coordinator failover
SERVER-41758 Dropping config.shards is allowed and can cause mongos to crash in aggregation code
SERVER-42006 Add transaction tags to prepared_txn_metadata_refresh.js
SERVER-42234 Make txn_two_phase_commit_failover.js robust to all replica nodes running for election at the same time
SERVER-42335 ShutdownShouldCancelQueuedRequests cpp test can ignore kill signal
SERVER-42338 transaction_coordinator_test can self deadlock
SERVER-42457 Check if cluster time has been set on TransactionRouter before observing from an external thread
SERVER-42559 Race in WaitWithOpTimeEarlierThanLowestQueued causes it to fail
SERVER-42610 Flip order of assert.lte arguments in shards_and_config_return_last_committed_optime.js
SERVER-42751 Take CSRLock when observing transaction commit for migration
SERVER-42809 Track and log relevant single two phase commit metrics for transaction coordinator on mongod for currentOp
SERVER-42842 Unable to drop collection in admin database of sharded cluster
SERVER-42856 Transactions with write can be sent to the wrong shard
SERVER-42907 Add timeActiveMicros and timeInactiveMicros for transactions in mongos currentOp output
SERVER-42963 For active sessions only set transaction stats in TransactionRouter::Observer::_reportState()
SERVER-43196 Blacklist update_where.js from sharded concurrency suites with balancer on and no txn override

Replication

SERVER-7019 rs.status needs to show initial sync happening
SERVER-7681 Report majority number in ReplSetGetStatus/isMaster
SERVER-36570 Make OplogEntry mutable
SERVER-38356 Forbid dropping oplog when replset config is present
SERVER-39576 Remove doTxn test command
SERVER-39610 Reformat TransactionParticipant comments and remove last references to the metrics mutex
SERVER-39613 Remove kCommittingWithPrepare and kCommittingWithoutPrepare from TransactionState
SERVER-39614 Remove inActiveOrKilledMultiDocumentTransaction() from TransactionParticipant
SERVER-40466 Unify checks for inMultiDocumentTransaction and friends
SERVER-41221 rollback_after_enabling_majority_reads.js test should make sure the final rollback occurs on node 0
SERVER-41457 Unify the different ways the TransactionParticipant offers for aborting a transaction
SERVER-41465 fassert when applying operations for transactions on secondaries
SERVER-41481 Return dbResponse object stored with exhaustNS and exhaustCursorId in receivedCommands
SERVER-41482 makeExhaustMessage should no longer call OpMsg::parse
SERVER-41497 Create IDL types for ElectionMetrics, ElectionCandidateMetrics and ElectionParticipant Metrics
SERVER-41498 Create ReplicationMetrics class
SERVER-41499 Track number of elections called for each reason in serverStatus
SERVER-41500 Track number of successful elections for each reason in serverStatus
SERVER-41501 Track the number of elections that require primary catchup in serverStatus
SERVER-41502 Track the number of times primary catchup concludes for each reason in serverStatus
SERVER-41503 Track the target opTime for catchup in replSetStatus on primaries
SERVER-41504 Track the number of ops during catchup in replSetStatus on primaries
SERVER-41505 Track the average number of catchup ops in serverStatus
SERVER-41506 Track metrics associated with a node calling an election
SERVER-41507 Track the time the new term oplog entry was written in replSetStatus on primaries
SERVER-41508 Track the time the new term oplog entry was majority committed in replSetStatus on primaries
SERVER-41509 Track the number of attempted stepDowns in serverStatus
SERVER-41510 Track the number of failed stepDowns in serverStatus
SERVER-41511 Track the number of stepdowns caused by seeing a higher term in serverStatus
SERVER-41580 Don't run transactions suites on the No Journal builder
SERVER-41788 Add OplogApplication::Mode to options in the OplogApplier
SERVER-41918 CollectionBulkLoader does not anticipate exceptions from MultiIndexBlock
SERVER-41955 Add test for replicating prepare oplog entries that were received during initial sync
SERVER-41956 Add integration tests for killOp of commit and abort of prepared transactions
SERVER-41957 Add integration tests for killSessions of a session with a prepared transaction on it
SERVER-41958 Add a test for rolling back prepare and then trying to retry prepare
SERVER-41959 Test running transaction commands through the applyOps command
SERVER-42129 Modify test to account for the ephemeralForTest storage engine's missing oplog after restart
SERVER-42155 Indicate term mismatches when readConcern times out
SERVER-42219 Oplog buffer not always empty when primary exits drain mode
SERVER-42453 ensure current clusterTime is greater than afterClusterTime value for read in step_down_on_secondary.js
SERVER-42454 Wait for node to find appropriate sync source before disabling failpoint in do_not_advance_commit_point_beyond_last_applied_term.js
SERVER-42478 Remove DB MODE_X locks from oplog application of create/createIndexes
SERVER-42484 May not be inside required WriteUnitOfWork when writing multikey index keys during initial sync data cloning
SERVER-42523 Add more logging to oplog_rollover.js
SERVER-42534 Step down primary for less time in freeze_timeout.js and increase electionTimeoutMillis
SERVER-42562 Increase election timeout for recover_prepared_transactions_startup_secondary_application.js
SERVER-42602 Guarantee that unconditional step down will not happen due to slow node restarts in rollback_fuzzer_[un]clean_shutdowns suites.
SERVER-42613 getHashes should default to liveSlaves, not _slaves in replsettest.js
SERVER-42714 Log replication recovery oplog application completion at level 0
SERVER-42750 OperationContext::inMultiDocumentTransaction() doesn't return true when applying operations for prepared transaction during recovery
SERVER-42755 recover_prepared_txn_with_multikey_write.js should make sure no prepare conflicts are generated on catalog object after restarting node
SERVER-42767 Improve logging in ReplSetTest.stopSet
SERVER-42910 Oplog query with higher timestamp but lower term than the sync source shouldn't time out due to afterClusterTime
SERVER-43016 Fix typo in timestamped_reads_wait_for_prepare_oplog_visibility.js and check that nModified = 1
SERVER-43230 Fix race in catchup_takeover_two_nodes_ahead.js
SERVER-43237 replSetFreeze and replSetStepDown cmd done part of restartNode()/transitionToSteadyStateOperations() in rollback test should be resilient of network error.
SERVER-43330 ReplicationStateTransitionLockGuard::_unlock doesn't work with its move constructor

Query

SERVER-37690 countDocuments throws an error when matching 0 document
SERVER-40110 ClusterCursorManager::CursorEntry::isKillPending() should not call checkForInterrupt
SERVER-40382 Add a serverStatus metric to report plan cache memory consumption
SERVER-41863 Make sleep command check that server clock has advanced before returning
SERVER-41996 Improve PlanExecutor error logging
SERVER-42399 max_time_ms.js test should always disable failpoints if an exception is thrown
SERVER-42514 wait for all nodes to finish index builds in text_index_limits.js
SERVER-42518 Wildcard index plans miss results when the query path has multiple subsequent array indexes
SERVER-42744 Fix transaction history iterator to not return unowned BSON that may be left dangling
SERVER-42749 Ban server_status_with_timeout_cursors from transaction passthroughs
SERVER-42864 change index build initial write timestamp logic
SERVER-43074 Do not use a global variable to encode 'multikeyPath' information when writing out catalog documents
SERVER-43202 Aggregation system can continue trying to execute a query plan after being interrupted, leading to server-fatal invariant failure

Aggregation

SERVER-41770 Multiversion test for change stream support of large transactions
SERVER-42756 $multiply operator may return with or w/o an error depending on whether pipeline optimisation is enabled

Catalog

SERVER-42567 Remove magic from CollectionImpl and IndexCatalogImpl

Storage

SERVER-39708 Fastpath no-ops to multikey updates in IndexBuildInterceptor::sideWrite to avoid mutex acquisition
SERVER-41533 Remove unnecessary IndexConsistency::_classMutex
SERVER-41534 Reuse KeyString in RecordStoreValidateAdaptor
SERVER-41535 Use vector instead of map for IndexConsistency::_indexesInfo
SERVER-41536 Use vector instead of map for IndexConsistency hash buckets
SERVER-41537 Use 64K hash buckets instead of 4M for index validation
SERVER-41538 Remove indirection through indexNumber in IndexConsistency
SERVER-41539 Cache key ordering in IndexInfo
SERVER-41540 Fix _indexNsResultsMap usage
SERVER-41909 Add the ValidateCmd Genny workload to system_perf.yml
SERVER-41937 Add a try-catch block in TimestampMonitor::startup() or notifyAll() to suppress exceptions
SERVER-41947 Disallow using the "system.views" collection name as the source or target names in the rename command
SERVER-42060 Limit maximum recursion depth for KeyString _appendBsonValue and toBsonValue
SERVER-42205 Raise the snapshot window's cache pressure threshold from 50 to 95
SERVER-42373 Prevent "invalid view definition" error while dropping nonexistent collection
SERVER-42441 renameCollectionForApplyOps should always rename the target out of the way if it exists
SERVER-42652 Fix issue with rename collection
SERVER-42718 dropDatabase commands can be run concurrently, leading to an invalid state
SERVER-42799 obtain timestamp for cleaning up index build without noop write
SERVER-42800 skip size adjustments on temporary record stores for index builds
SERVER-42803 Remove 'no except' in the TimestampMonitor
SERVER-42824 do not lock RSTL for index build cleanup
SERVER-42869 IndexBuildInterceptor rollback handler access _sideWritesCounter field after interceptor is destroyed
SERVER-42915 New style repair's catalog corrections are often false positives, aggressively marking repl nodes as corrupted
SERVER-43019 IndexBuildsCoordinator removes interrupted index build at shutdown on secondary
SERVER-43025 rollback should ignore no-op startIndexBuild oplog entry
SERVER-43075 MongoDB 4.2 cannot use storage.journal.commitIntervalMs param in yaml config file.
SERVER-43322 Add tracking tools for measuring OplogStones performance

WiredTiger

SERVER-39004 Introduce a quota mechanism for the overflow file

Operations

SERVER-41874 Never kill cursors in shell garbage collection in concurrency_simultaneous_replication
SERVER-42599 Regression prevents use of 'show collections' without listCollections privilege
SERVER-42969 Handle non-ascii characters in`USERPROFILE` environment variable.
SERVER-43005 getKeyVault.createKey() should return the created data key
SERVER-43039 db.collection.bulkWrite doesn't support hint with replaceOne
SERVER-43265 Mongo Shell exits with InvalidOptions error when using URI compressors parameter

Build and Packaging

SERVER-37768 Platform Support: Add Community & Enterprise Debian 10 x64
SERVER-37772 Platform Support: Add Community & Enterprise RHEL 8 x64
SERVER-41232 Update man pages
SERVER-41431 Platform Support: Re-enable SUSE 15 build variants
SERVER-41570 Xcode 11 generates new warnings
SERVER-42778 hot_backups should use RHEL 7 large
SERVER-42787 4.2.0 regression (vs 4.0.12): Build failure with various system packages
SERVER-42911 Rebuild mongodb by building.md and failed to build due to ModuleNotFoundError: No module named 'Cheetah' with MSVC on windows
SERVER-43046 Use toolchain python binary to create virtual environments

Internals

SERVER-25025 Improve startup time when there are tens of thousands of collections/indexes on WiredTiger
SERVER-36816 Avoid reloading the view catalog on the primary and secondaries during the dbhash check
SERVER-39776 Initial sync and replication threads simultaneous startup and shutdown races
SERVER-40004 Change the signature of AtomicWord::compareAndSwap to mimic the implementation
SERVER-41466 Blacklist mongos_no_detect_sharding from sharding_csrs_continuous_config_stepdown
SERVER-41492 Disable WiredTiger cursor caching and introduce more aggressive file handle sweeps in testing
SERVER-41585 background_thread_clock_source_test shouldn't assume we can schedule the background thread
SERVER-41622 Reduce noisiness in flow_control_replica_set.js
SERVER-41802 generate_resmoke_tasks doesn't apply max_sub_suites option
SERVER-41939 Connect to fastest LDAP server first
SERVER-42067 Ensure key Ordering offset does not exceed the maximum number of compound index keys
SERVER-42069 uassert when decimal type is encoded in KeyString V0
SERVER-42075 Add DSI module to perf.yml
SERVER-42178 Disable Split Horizon HOSTALIAS testing on SLES
SERVER-42210 Modify changestream tests on multiple databases to support interleaving
SERVER-42216 Ensure pin_getmore_cursor.js waits for server to finish killing cursor
SERVER-42303 NetworkInterfaceTL should schedule out-of-line immediately and never again
SERVER-42305 Need to ensure replication is finished initializing before advancing commit point in heartbeats
SERVER-42310 Specify mode for NamedTemporaryFile in hang_analyzer.py
SERVER-42356 teardown(finished=True) isn't ever called for the NoOpFixture
SERVER-42400 Add new task in system_perf.yml for million documents in transaction workload
SERVER-42419 Ban whole_cluster_metadata_notifications test from running with majority read concern off
SERVER-42424 Blacklist max_doc_size.js and mr_bigobject.js from Periodic Kill Secondaries suite
SERVER-42440 burn_in_test should run tasks on the distro they are normally run
SERVER-42452 failNonIntentLocksIfWaitNeeded failpoint interrupts lock requests in UninterruptibleLockGuard
SERVER-42461 Allow errors in aggregates_during_balancing.js pending work in SERVER-29446
SERVER-42469 Increase initial sync passthrough timeout to 24 hours
SERVER-42476 Improve free monitoring tests
SERVER-42520 Auto encryption of a $changeStream aggregation fails with obscure error
SERVER-42561 search_beta_* tests fail on testing only changes
SERVER-42571 Collect Windows event logs on remote machine during powercycle
SERVER-42608 Allow updateOne and updateMany in shell helper to accept hint
SERVER-42615 Run chkdsk command on Windows after each powercycle loop
SERVER-42622 resmoke.py doesn't attempt to tear the fixture down if setting it up raises an exception
SERVER-42623 sched module in Python 3 causes close() event to mistakenly be canceled, leading to resmoke.py hang
SERVER-42837 Allow the waitInFindBeforeBatch FailPoint to take a data.nss parameter
SERVER-42866 Trigger a logical session cache refresh on all shards in the ShardedCluster test fixture before running test
SERVER-42888 Deprecate CodeWScope for use within the mapReduce command
SERVER-42917 Flow Control should disregard faulty wall clock time readings during lag calculation
SERVER-42946 Setting 4.2 FCV in standalone with existing transaction table crashes MongoDB
SERVER-42953 ttl_repl_secondary_disabled.js should prevent elections
SERVER-43004 Turn on archive for zbigMapReduce in sharding suite
SERVER-43022 Allow compile to be run independently on rhel 62
SERVER-43081 validate should report when an index's 'multikeyPaths' are set but the 'multikey' flag is false
SERVER-43093 Concurrent calls to ShardingReplicaSetChangeListener::onConfirmedSet can cause starvation in the fixed executor
SERVER-43166 auditFormat BSON writes incomplete bson
SERVER-43186 Limit the number of tests added to a generated suite
SERVER-43200 Make auth/mongoURIAuth.js robust to slow commands
SERVER-43288 Update fallback values for generated tasks

Back

Downgrade 4.2 Sharded Cluster to 4.0

Release Notes for MongoDB 4.0

4.2 Changelog.leafygreen-ui-m0pgrr{-webkit-align-self:center;-ms-flex-item-align:center;align-self:center;padding:0 10px;visibility:hidden;}.leafygreen-ui-a30zj9{color:#889397;vertical-align:middle;margin-top:-2px;}.css-fmznk8{margin-top:-85px;position:absolute;padding-bottom:2px;}

4.2.24 Changelog

Sharding

Aggregation

Internals

4.2.23 Changelog

Sharding

Internals

4.2.22 Changelog

Sharding

Build and Packaging

Internals

4.2.21 Changelog

Build and Packaging

Internals

4.2.20 Changelog

Sharding

Aggregation

Internals

4.2.19 Changelog

Sharding

Query

Aggregation

Storage

Internals

4.2.18 Changelog

Sharding

Replication

Aggregation

Storage

Operations

Internals

4.2.17 Changelog

Storage

Internals

4.2.16 Changelog

Security

Sharding

Replication

Query

Build and Packaging

Internals

4.2.15 Changelog

Security

Sharding

Replication

Write Operations

Storage

Operations

Build and Packaging

Internals

4.2.14 Changelog

Sharding

Replication

Query

Storage

Operations

Build and Packaging

Internals

4.2.13 Changelog

Sharding

Replication

Query

Storage

Build and Packaging

Internals

4.2.12 Changelog

Sharding

Replication

Query

Aggregation

Storage

Build and Packaging

Internals

4.2.11 Changelog

Security

Sharding

Replication

Query

Write Operations

4.2 Changelog