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DOCS-15134 4.2.19 changelogs (#725)
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‎source/includes/changelogs/releases/4.2.19.rst

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.. _4.2.19-changelog:
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4.2.19 Changelog
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----------------
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Sharding
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~~~~~~~~
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- :issue:`SERVER-26755` Collection chunk loading is aborted entirely if fetching all the chunks takes more than 30 seconds
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- :issue:`SERVER-45149` replSetStepDown command in txn_two_phase_commit_failover.js should not timeout
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- :issue:`SERVER-53335` Queries, updates, and deletes with non-"simple" collations may miss documents when using hashed sharding
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- :issue:`SERVER-59929` unexpected slower update/insert operation bease of splitchunk and moveChunk
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- :issue:`SERVER-60682` TransactionCoordinator may block acquiring WiredTiger write ticket to persist its decision, prolonging transactions being in the prepared state
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- :issue:`SERVER-61816` cancel_coordinate_txn_commit_with_tickets_exhausted.js can hang forever due to race condition between transaction reaper and transaction coordinator
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- :issue:`SERVER-61924` retryable_mongos_write_errors.js fails in 4.2 multiversion suites due to missing failpoint command in 4.0
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- :issue:`SERVER-62065` Upgrade path from 3.6 to 4.0 can leave chunk entries without history on the shards
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- :issue:`SERVER-62739` cancel_coordinate_txn_commit_with_tickets_exhausted.js test should not be run with the ephemeral storage engine
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- :issue:`SERVER-62906` Add a check in the createCollection/shardCollection path verifying the collection name length
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Query
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~~~~~
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- :issue:`SERVER-23664` $mod match expression should raise an error when the remainder is not a number
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- :issue:`SERVER-57588` Inconsistent query results when an array position is indexed whose value is an array
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- :issue:`SERVER-59754` Incorrect logging of queryHash/planCacheKey for operations that share the same $lookup shape
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- :issue:`SERVER-62147` Exhaust query using the OP_QUERY protocol is broken when more than one getMore batch is required
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Aggregation
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~~~~~~~~~~~
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:issue:`SERVER-44484` Changestream with updateLookup uasserts on updates from before collection was sharded
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Storage
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~~~~~~~
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:issue:`SERVER-55483` Add a new startup parameter that skips verifying the table log settings
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Internals
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~~~~~~~~~
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- :issue:`SERVER-51087` Add testing utility for creating an empty sharded collection with the specified bounds
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- :issue:`SERVER-53726` Platform Support: Remove RHEL6 zSeries
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- :issue:`SERVER-57312` Pin transitive Python dependencies and use the pinned file for installation in Evergreen
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- :issue:`SERVER-57676` Wait for a checkpoint before releasing the "hangOplogCapMaintainerThread" in oplog_rollover.js
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- :issue:`SERVER-60392` Fix timing in priority_takeover_two_nodes_equal_priority test.
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- :issue:`SERVER-60685` TransactionCoordinator may interrupt locally executing update with non-Interruption error category, leading to server crash
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- :issue:`SERVER-61662` SCons configure checks should always run with verbosity
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- :issue:`SERVER-61743` The -fno-builtin-memcmp flag shouldn't be applied except on x86_64 platforms
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- :issue:`SERVER-62005` [4.2] Add requires_document_locking to unique_index_insert_during_collection_scan.js
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- :issue:`SERVER-62164` Remove several obsoleted build variants across all stable branches
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- :issue:`SERVER-62320` (v4.2) Fix use after std::move in find command
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- :issue:`SERVER-62668` Synchronize access to ImpersonatedUserMetadata in OperationContext.
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- :issue:`SERVER-62825` Robustify causally_consistent_index_builds.js
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- :issue:`SERVER-63197` Pin microbenchmarks genny version
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- :issue:`SERVER-63203` Chunk splitter never splits if more than 8192 split points are found
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- :issue:`WT-7993` If gathering handles and not in aggressive eviction mode, have eviction sleep to let checkpoint grab a contentious spinlock.

‎source/release-notes/4.2-changelog.txt

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.. include:: /includes/changelogs/releases/4.2.19.rst
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.. include:: /includes/changelogs/releases/4.2.18.rst
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.. include:: /includes/changelogs/releases/4.2.17.rst

‎source/release-notes/4.2.txt

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2020
Patch Releases
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--------------
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.. _4.2.19-release-notes:
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4.2.19 - Upcoming
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~~~~~~~~~~~~~~~~~
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Issues fixed in 4.2.19:
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- :issue:`SERVER-62065` Upgrade path from 3.6 to 4.0 can leave chunk
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entries without history on the shards
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- :issue:`SERVER-60685` TransactionCoordinator may interrupt locally
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executing update with non-Interruption error category, leading to
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server crash
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- :issue:`SERVER-60682` TransactionCoordinator may block acquiring
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WiredTiger write ticket to persist its decision, prolonging
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transactions being in the prepared state
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- :issue:`SERVER-53335` Queries, updates, and deletes with non-"simple"
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collations may miss documents when using hashed sharding
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- :issue:`SERVER-40691` $nin:[...] queries are not indexed
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- `All JIRA issues closed in 4.2.19
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<https://jira.mongodb.org/issues/?jql=project%20in%20(SERVER%2CTOOLS%2CWT)%20AND%20resolution%3D%27Fixed%27%20and%20fixversion%3D%274.2.19%27>`__
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- :ref:`4.2.19-changelog`
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.. _4.2.18-release-notes:
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4.2.18 - Jan 6, 2022

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