What's new in the YugabyteDB v2024.1 STS release series

Improvements

YSQL

• Introduces the yb_make_next_ddl_statement_nonincrementing configuration parameter to reduce catalog version increments during many consecutive DDLs, lowering memory and latency spikes. #23786
• Added yb_make_next_ddl_statement_nonincrementing to YbDbAdminVariables for yb_db_admin role. #23786

YCQL

• Updates YCQL tables system_schema.functions and system_schema.aggregates to align with Cassandra, aiding Cortex migration. #3893

DocDB

• Enables reduction of duplicate code and custom flag filtering through GetFlagInfos relocation. #23632
• Allows reduction of thread stack size to avoid Linux hugepage backing. #23927
• Adds emergency_repair_mode flag and yb-admin commands dump_sys_catalog_entries and write_sys_catalog_entry to address CatalogEntity data corruption issues. #23098
• Introduces a new gflag max_disk_throughput_mbps for automated control of write rejections when disk is full, replacing reject_writes_min_disk_space_aggressive_check_mb. #23373
• Allows explicit addition of gFlags to gflag_allowlist.txt for secure callhome data collection, plus version_info in tserver data. #24103

CDC

• Allows dynamic table addition alongside table removal from CDC streams without needing to disable or restart. #23581
• Adds a yb-admin option to disable dynamic table addition when creating new streams. #23482
• Allows automatic cleanup for ineligible tables on CDC streams and improves the removal process by fetching tablet list from a local copy instead of the state table, improving performance. Updates include removal of flag protection for Step-1 and the replacement of the preview flag. #23806
• Syncs table removal from a CDC stream to a more performant async process, allowing both manual and automatic removal via the RemoveUserTableFromCDCSDKStream and RemoveTablesFromCDCSDKStream RPCs respectively. This change utilizes a background thread to enhance user table deletion while preserving data consistency. #23700
• Enables asynchronous removal of user tables from CDC streams by adjusting how background threads process and persist stream metadata. #23700
• Disables wal_level checks for logical replication in YSQL as PG WAL is not used. #23661
• Changes the default wal_level to logical to ensure compatibility with logical replication clients. #23661

yugabyted

• Enables bitmap scans and removes size-based fetching in the pg parity feature by updating GFlags. #23777
• Enhances yugabyted configure_read_replica commands with checks to gracefully handle failures when data_placement_constraint lacks :<num_of_replicas>. #23273
• Allows yugabyted UI metrics to display correctly when deployed with Kubernetes OSS operator. #22532
• Reduces data redundancy by stopping the sending of gflags information from yugabyted in callhome diagnostics. #24029

Bug fixes

YSQL

• Fixes an issue related to regular expression pushdown causing inconsistency and crashes by introducing thread local cache. #22989
• Resets catalog read time after table prefetching to prevent outdated readings for on-demand loading from a master. #23421
• Corrects IndexScan's indextlist to improve accuracy of variable references in subquery scenarios. #22533
• Fixes crashes caused by using a RowComparisonExpression on a reordered primary key index. #23824
• Fixes repeated calls in DeleteTableInternal, preventing YbAdminSnapshotScheduleTest.SysCatalogRetention failure on asan builds. #23459
• Resolves potential memory corruption by mutating pushdown expressions outside the per tuple context. #23461
• Eliminates the publishing of empty metrics from the statementType enum on the YSQL Metrics endpoint. #23557
• Revamped Storage Read Requests metric now better reflects true RPC count in PrecastRequestSender usage. #23396, #18785
• Adds more logs to aid in debugging a transaction status mismatch issue. #23669
• Addresses a bug in YSQL that caused crashes while costing an index scan on a hash index with included columns using CBO. #22772
• Fixes the hanging issue when creating a colocated table by correcting the unconditional reading of the relkind column. #23708
• Fixes a bug that caused incorrect deducing of commit/abort status for transactions which do not change the table's schema. #23669
• Replaces deprecated function shared_ptr::unique to resolve compilation errors on macOS. #24012
• Improves cache re-invalidation for ALTER TABLE commands to avoid schema version mismatch errors within the same session. #23882
• Adds a new GFlag TEST_check_catalog_version_overflow that can detect and prevent catalog version overflow issues. #24021
• Removes unnecessary DCHECK for smoother rolling upgrades from release 2.20, enhancing ysql_enable_db_catalog_version_mode gflag functionality. #23462
• Enables a node to successfully join using the join flag by implementing a retry mechanism. #23898

DocDB

• Limits response size by omitting per-object details from SysSnapshotEntryPB in ListSnapshotSchedules RPC. #23518
• Reduces the risk of deadlocks when making active read/write requests to a table right after a tablet-split. #23747
• Simplifies handling of large RPC responses by catching errors earlier and appropriately using narrow_cast. #22301
• Switches write query duration from CoarseMonoClock to MonoClock for precise nanosecond granularity. #20335
• Refactors to remove an assumption that every tserver hosts tablets, preventing crashes in certain circumstances. #20230
• Sets the close_timestamp_micros field for partially copied log segments to prevent time-based policy violation. #23335
• Eliminates persistent logging issue after dropping a colocated table by removing unnecessary logs. #22037
• Corrects leader balancing for geopartitioned tables to prevent early exits and ensure accurate global leader sorting. #23886
• Enables batching of metric updates for YCQL reads to prevent performance slowdowns. #21832
• Ensures "create table" requests for colocated tables don't fail due to mistaken tablet limit checks. #23922
• Ensures node restarts successfully with secure enabled by introducing a timeout framework. #23447
• Promotes cluster start-up when master_webserver_port is customized by considering user input during the validate_and_set_configs step. #23629

CDC

• Prevents tserver crash by giving each thread its own copy of SchemaDetailsMap during concurrent GetChanges calls. #23394, #22962
• Refactors CDCSDK to prevent data loss during workload with single shard transactions by ensuring WAL messages are committed before being replicated. #19294
• Reduces disk IO overhead by optimizing the tablet-meta update process in CDCService. #22805
• Introduces three new yb-admin commands for managing user tables in a CDC stream and addresses a race condition issue by removing an optimization in the UpdateCheckpointForTabletEntriesInCDCState method. #22876, #22835, #22773
• Obsoletes expired or unpolled tables from CDC stream and state table, reducing unnecessary resource retention and potential blocking of split tablet deletion. #23367
• Filters out records related to index tables in colocated databases to prevent GetChanges call failures. #23809
• Ensures old-tuples for updates are only sent when replica identity is FULL, matching PostgreSQL behavior. #23353

yugabyted

• Offers corrected DB OID in the function calculate_table_size, now matching YBCGetDatabaseOid(rel) for improved reliability. #20030

Improvements

YSQL

• Avoids renaming DocDB tables during legacy rewrite operations to prevent issues with backup/restore and improves handling of failed ADD/DROP primary key, ALTER TYPE operations. #22802
• Adds Save/Restore state functionality to ConsistentReadPoint using a new Momento class. #22597

DocDB

• Allows asynchronous DNS cache updating and resolution retry upon failure to reduce RPC call delays and prevent unexpected leadership changes. #22930, #22311
• Enhances stack trace tracking endpoints usability by adding an access button, a reset tracking link, and timestamp details. #22842
• Introduces a new flag enable_rwc_lock_debugging to control slow lock debugging and fixes a bug in rwc_lock.cc. #22807

yugabyted

• Enables better handling of multi-valued flags in yugabyted without duplication, making the system more maintainable. #22091
• Enables xCluster replication management between database clusters using new yugabyted commands. #22349
• Reduces collect_logs command failures by removing the yugabyted running check even when the yugabyted process is not running. #23210
• Introduces upgrade_finalize command for easy YugabyteDB version upgrades using yugabyted CLI and includes an upgrade_ysql_timeout flag. #21888
• Enhances yugabyted configure_read_replica commands with checks to gracefully handle failures when data_placement_constraint lacks :<num_of_replicas>. #23273

Bug fixes

YSQL

• Allows YB Admins to run pg_locks without requiring superuser status. #23266
• Allows faster data inserts into tables with identity columns. #22837
• Prevents a crash related to memory release associated with TupleTableSlots in SubPlans during a Values Scan. #22967
• Reduces prefix length in the index when using distinct index scan with included columns. #22822
• Allows resetting of stats collected by the ANALYZE command, including reltuples, pg_statistic rows, and pg_statistic_ext values. #22028
• Eliminates unnecessary waiting for concurrent transactions in the DEFERRABLE mode for READ ONLY serializable transactions. #23120
• Streamlines the "drop column" operation process, preventing hindrance even if the alter schema RPC is missed. #23100
• Fixes TServer crash when pushing down certain SAOP operations like string_to_array. #23287
• Allows pg_replication_slots to return an empty response instead of an error when ysql_yb_enable_replication_commands flag is false. #23096
• Ensures the node restarts properly even with secure mode enabled by adding a timeout framework. #23447

DocDB

• Allows restoring a snapshot schedule from a time just before the oldest snapshot, improving usability. #21269
• Fixes issue of scans not honoring timeouts, preventing indefinite reads and reducing CPU usage. #21829
• Adds validation to RPCs DeleteSnapshot and RestoreSnapshot to prevent deletion or use of snapshots involved in ongoing processes. #23055
• Prevents unexpected leader fatal errors by updating cached leader terms immediately after a leader change. #21808
• Allows the persistent mapping of source-target schema versions when a new table is added to a colocated database, thus preventing replication from stalling after TServer restarts. #23188
• Updates cotable IDs in flushed frontiers during a snapshot restore, preventing potential post-restore issues. #23047
• Ensures object drops correctly cascade to dependent columns in the DocDB table, preventing inconsistencies. #22874
• Allows large bytes to be requested on RateLimiter, preventing indefinite call stalling. #23173
• Restores the previously missing home icon in the master user interface. #23275
• Removes extra reads during the processing of INSERT INTO ...RETURNS STATUS AS ROW for CQL tables with a specific primary key, improving system load and efficiency. #23330

CDC

• Introduces new auto flag cdcsdk_enable_identification_of_non_eligible_tables and three yb-admin commands to manage tables in CDC stream, enhancing control and reducing unnecessary resource usage. #22876, #22835, #22773
• Fixes the issue of getting either 0 or a random time as the server's system clock in XLogData from the logical replication stream. #22929
• Simple: Adds null checks and removes table removal optimization for CDC stream, ensuring proper arrangement and functioning of user-created tables. #22876, #22835, #22773
• Enables support for dynamically allotted OID data types in CDC to prevent system crashes. #23179
• Allows handling of non-eligible table cleanup in CDC stream loading even after table drop, preventing master crash. #23278

Improvements

YSQL

• Eradicates misleading log message during table creation with DDL atomicity enabled. #22459
• Removes the unused keep_order field from YbctidGenerator for cleaner results processing. #21944
• Updates read time for each operation to simplify code and avoid applying used read time from obsolete operations. #21623
• Enhances logging for DDL atomicity and corrects a loop index in cross-db unit test for clearer test logs. #22736

DocDB

• Offers a new stack trace tracking framework for improved visibility of disk I/O operations, configurable through the track_stack_traces flag. #17993
• Introduces utility to dump top heap stacks when memory limit is exceeded for enhanced debugging. #21396
• Adds SCHECK_PB_FIELDS_NOT_EMPTY macro for validating non-empty fields, with individual checks on list elements. #22182
• Disables the unused and unreliable NamespaceReplication tests temporarily for seamless operation. #22457
• Eliminates potential deadlock issue in DeleteOrHideTabletsAndSendRequests by removing unnecessary shared lock, and introduces a test for bug 22608. #22618
• Refreshes stack trace tracking UI endpoints to enable per-column sorting and optimize sorting script. #22841
• Introduces two new SOURCE_UNREACHABLE and SYSTEM_ERROR enums to enable more detailed error reporting from the Poller. #22996
• Refreshes stack trace tracking UI endpoints to enable per-column sorting and optimize sorting script. #22841
• Introduces two new SOURCE_UNREACHABLE and SYSTEM_ERROR enums to enable more detailed error reporting from the Poller. #22996
• Shifts tcmalloc profiling code to the Utils folder. #22258
• Enhances visibility of the Hidden state in Master/Tserver Tables UI by shifting its position more prominently to the State column. #22521

CDC

• Prevents addition of tables with enum array column to the CDC stream to avoid crashes during consumption. #22897
• Transforms the flag yb_enable_cdc_consistent_snapshot_streams from a preview into a default true auto flag. #22984
• Introduces three new yb-admin commands to remove a user table from a CDCSDK stream, descend dynamic table addition in a CDC stream, and validate CDC state for a particular stream, enhancing control over CDC streams. #22876, #22773
• Adds a TServer flag, ysql_yb_default_replica_identity, for customizing default replica identity at table creation. #22326
• Introduces cdcsdk_enable_dynamic_table_addition flag to manage dynamic table additions in replication slot consumption model. #22406
• Introduces replication slot name for internal distinction between two consumption models in the code. #22810
• Allows creating an old model stream via yb-admin in upgraded environments, ensuring only one stream type per database. #22894
• Eliminates unnecessary NOTICE messages when setting yb_read_time from walsender, reducing message clutter. #22379

yugabyted

• Allows to specify multiple data directories using the new additional_data_dir configuration. #22126

Bug fixes

YSQL

• Fixes an error that occurs when decoding null values from a boolean column sorted as NULLS LAST in a secondary index. #22121
• Fixes YSQL upgrade single connection mode error preventing new connection attempts before the old ones are released. #22283
• Fixes memory leaks in pg_constraint/pg_attrdef local cache by adding a missing hash_destroy call in YbCleanupTupleCache. #22262
• Fixes a memory leak in catalog cache refresh during upgrade that led to higher memory consumption. #22262
• Resolves remaining memory leaks in CacheMemoryContext to stabilize cache memory after every catalog cache refresh. #22262
• Stops Batched Nest Loop (BNL) crashes by ensuring better indexing condition checks. #21954
• Refines the logic to accurately push down join clauses to batched index scans without causing conflicts. #21878
• Re-enables rechecking for RowCompareExpressions to accurately handle NULL inputs in scan bound calculations. #22075
• Grants BNL hashtable its own expression context to prevent data overwrites during query execution. #21266
• Allows for an enhanced readability and performance of yb_cost_index code, aiding in merging with the pg15 branch. #21672
• Fixes a bug in the index tuple width calculation for better YB base scans cost model. #21892
• Makes yb_get_range_split_clause robust using PG TRY CATCH block, ensuring YB backup doesn't fail. #22356
• Prevents coredumps by ensuring YSQL webserver destruction upon receiving a termination signal. #18948
• Reduces test iterations of PgCatalogVersionTest.SqlCrossDBLoadWithDDL in tsan/asan build to prevent timeouts. #22475
• Fixes memory leaks in ybcFetchNextHeapTuple by properly freeing the YBCStatus. #22396
• Replaces TRUNCATE with DELETE FROM in TestPgTransparentRestarts, enhancing its stability and reducing flakiness. #22522
• Allows CreateNamespaceIfNotExists function to retry on "already exists" error, preventing race conditions. #22512
• Removes the unused function Catalocustomeranager::WaitForDdlVerificationToFinish for clarity. #22649
• Resolves potential database OID collision with system_postgres by excluding reserved OID 65535 in allocation. #22598
• Prevents the IN expressions on single column from wrongly taking the tuple path, ensuring correct data processing. #22704
• Ensures bitmap scans correctly recheck all results and avoid excluding rows, improving accuracy of outcomes. #22622
• Fixes incorrect access to the scan plan's bind descriptor during tuple IN condition rechecks. #22800
• Allows the creation of new shared relations during YSQL upgrade to have a global impact by incrementing the catalog version across every database. #22830
• Corrects the YbGetOrdinaryColumnsNeedingPgRecheck function to return table column numbers instead of index numbers, preventing unnecessary data fetches and potential crashes or errors after dropping a column. #22832
• Fixes the issue when a separately created and later attached partition does not properly inherit the parent's primary key using ALTER TABLE ...ATTACH PARTITION. #22562
• Now allows for correct backward prefix-based scanning by eliminating the problematic kGroupEnd marker that was leading to inaccurate seek results. #22615
• Reduces unexpected log messages by not invoking YsqlDdlTxnCompleteCallback if all table 'pb_txn_id's in the DDL transaction verifier state are already cleared, avoiding potential deadlock situations in DDL atomicity. #22882
• Reduces sequence cache collision by incorporating both database and sequence OIDs as the entry key. #22935
• Resolves a detected deadlock during ALTER TABLE operations, enhancing test stability. #22882
• Prevents a crash related to memory release associated with TupleTableSlots in SubPlans during a Values Scan. #22967
• Eliminates the occurrence of "schema version mismatch" error following a DROP INDEX statement by introducing a delay in index deletion. #22637

DocDB

• Eliminates possible deadlock during setup replication by fixing the order in which locks are acquired. #22376
• Removes unnecessary flush during snapshot deletion, preventing write blocks. #22369
• Resolves a heartbeat metrics issue ensuring full xCluster error information is sent to the new master even during a leader failover, and makes tserver_heartbeat_metrics_interval_ms runtime updatable. #22624
• Converted the ysql_skip_row_lock_for_update to an auto-flag to resolve compatibility issues during upgrade, preventing incorrect DB record creations that can affect row visibility and integrity. #22057
• Prevents duplicate entries in the sequence data filter used by Snapshot schedules, ensuring successful operations. #22663
• Resolves the issue of pg_locks query failure due to missing host node UUID in distributed transactions. #22181
• Clarifies memory division flags to reflect they are percentage of the process's hard memory limit, not total available memory. #22423
• Eliminates latency spikes in conflicting workloads by preventing redundant ProbeTransactionDeadlock RPCs. #22426
• Prevents premature metric destruction during Prometheus scrapes, resolving non-UTF8 character issues. #22767
• Ensures failed xCluster setup if the xCluster stream state update to ACTIVE does not occur. #22601

CDC

• Ensures deletion of MemoryContext after each GetChanges RPC to prevent memory leaks. #22328
• Prevents newly created indexes, materialized views, and non-user tables from being added to the Chang Data Capture (CDC) stream metadata. #22808
• Reduces resource usage by removing non-eligible tables, like indexes, from existing CDC SDK stream metadata, and releasing retention barriers. This change requires the master flag enable_cleanup_of_non_eligible_tables_from_cdcsdk_stream and limits processing to two non-eligible tables per namespace per run with cdcsdk_table_processing_limit_per_run. Introduces three yb-admin commands for managing CDC streams. #22876, #22835, #22773
• Fixes the issue of getting either 0 or a random time as the server's system clock in XLogData from the logical replication stream. #22929
• Fixes the segmentation fault in walsender for dynamic table addition by refreshing stored replica identities and preventing a race condition when creating dynamic tables. #22273
• Solves an issue where CDCSDK incorrectly deduces tablets as not interesting for stream before reaching the configured time limit. #22383
• Refines the logic to remove BEGIN record when no DML records are added, preventing potential virtual WAL crashes. #21646
• Addresses a race condition in dynamic table creation, enhancing stability during table and tablet initialization. #22408
• Increases timeout for deletion of slot entry from the state table to correct test failures in TSAN builds. #22560
• Resolves "could not open relation" error by updating slot creation method and simplifying yb_read_time logic. #22398
• Adds support for data types with dynamic OIDs in CDC to prevent crashes and allows tables with such columns to join the stream. #23179

yugabyted

• Eliminates inconsistent failures in TestSessionParameters.java by resetting roles to default instead of dropping them. #21523

Improvements

YSQL

• Enhances logging for DDL transaction conflicts and PG catalog version mismatches by including the DDL command tag and specific log details outside of the log_ysql_catalog_versions flag. #20084
• Displays distinct prefix keys explicitly in the explain output, enhancing the clarity of indexing for users. #20831
• Adds auto flag ysql_yb_enable_ddl_atomicity_infra to control DDL atomicity feature during the upgrade phase. #21535
• Allows YbInitPinnedCacheIfNeeded to only load the shared pinned cache, enhancing concurrent handling of DDLs in various databases. #21635
• Now logs global-impact DDL statements that increment all database catalog versions. #21826
• Adds a new YSQL view for YCQL statement metrics, allowing it to be joined with YCQL wait events in the yb_active_universe_history table. #20616
• Reduces per-backend memory consumption by reinstating TOAST compression for catalogue tables. #21040
• Avoids schema version mismatch errors during ALTER TABLE operations in cases where DDL atomicity is enabled. #21787
• Resolves schema version mismatch errors that occur after an ALTER TABLE operation due to DDL transaction verification in non-debug builds. #21787
• Introduces a new YSQL configuration parameter yb_enable_parallel_append to disable the unannounced feature parallel append. #21934
• Adds new columns to localhost:13000/statements for more comprehensive database management, including user and database IDs along with varied block level statistics. #21735
• Enables DDL atomicity feature by default by altering ysql_yb_ddl_rollback_enabled, report_ysql_ddl_txn_status_to_master, and ysql_ddl_transaction_wait_for_ddl_verification flags' defaults. #22097

YCQL

• Now throws an error when using the unsupported GROUP BY clause in YCQL with autoflag ycql_suppress_group_by_error available for compatibility issues. #13956

DocDB

• Introduces a new flag to toggle on or off recommended memory defaults for increased control over individual memory settings. #22161
• Boosts error messaging clarity when preview flags are not set in allowed_preview_flags_csv. #21484
• Shifts xCluster-related functions from Catalocustomeranager to XClusterSourceManager for easier management. #21325
• Adjusts TServer memory percentage from 50% to 48% for (4,8]GiB boxes and sets new recommendations for boxes over 16 GiB. #20664
• Returns the original error messages from CreateTable and CreateTablegroup instead of an incorrect "Database not found" message. #21760
• Updates AreNodesSafeToTakeDown to return earlier and deliver a readable error message when hitting a timeout, using a control flag, are_nodes_safe_to_take_down_timeout_buffer_ms with a default setting of 2 seconds. #21855
• Allows for faster failover in xCluster DR by skipping the cleanup process when skip_producer_stream_deletion is set on DeleteUniverseReplicationRequestPB. Safe for upgrades and rollbacks. #22050
• Adds a flag FLAGS_tablet_split_min_size_ratio to control tablet splitting based on SST file sizes, ensuring better control over tablet size imbalance. #21458

CDC

• Preserves CDC stream even when all associated tables are dropped, tying its lifecycle to the database. #21419
• Allows modification of the publication refresh interval using the cdcsdk_publication_list_refresh_interval_secs flag. #21796
• Introduces replica identity in CDC to populate before image records, allowing table-level before image information fetching and retaining in stream metadata. #21314
• Eliminates unnecessary NOTICE messages when setting yb_read_time from walsender, reducing message clutter. #22379
• Enables transaction state to be cleared promptly after a table is deleted, preventing table deletion from getting stuck and resulting in faster functionality. #22095

yugabyted

• Directly enables yb_enable_read_committed_isolation and ysql_enable_read_request_caching on yb-master and yb-tserver processes. #22061
• Simplifies yugabyted by dropping Python2 support and transitioning the script to use Python3, replacing deprecated distutils package with shutil. #22072, #21409

Bug fixes

YSQL

• Avoids failure when upgrading from version 2.14/2.16 to 2.20 by introducing a check to ensure pggate can handle RPC metrics sidecar before sending Scanned Rows count. #21229
• Safeguards against an out-of-bounds memory write error in HashAggregate plan node with duplicate columns by rectifying array size allocation. Imported tests ensure the fix's robustness. #21122
• Disables bitmap scan by default to prevent unwarranted selection due to lower CBO costs. #21479
• Allows YSQL DDL operations to wait for rollback/roll-forward operations to finish before proceeding. #20033
• Reduces unnecessary log messages when catalog_version_table_in_perdb_mode is set to true. #21481
• Corrects an issue where certain unbatchable filters weren't detected during indexpath formation when indexpath accepted batched values from multiple relations. Requires backports to 2.20 and 2.18. #21292
• Adds network latency cost to startup cost, yielding more accurate cost calculations in small tables. #20898
• Allows more accurate modeling of base scan costs by taking into account the impact of storage index filters on secondary index. #20635
• Renames the YSQL configuration parameter ddl_rollback_enabled to yb_ddl_rollback_enabled for specificity. #21480
• Resolves colocation option issues in table creation linked to table rewriting and partitioning. Enhances the defGetBoolean function to parse string values "0" and "1" as false and true respectively, and shifts a verification step to a earlier spot in the CREATE TABLE execution path, ensuring successful table partition creation. #20302, #20914
• Exposes the YSQL configuration parameter yb_enable_optimizer_statistics as a flag ysql_yb_enable_optimizer_statistics. #21650
• Corrects checks in YbIsScanCompatible to ensure the right-hand side (RHS) of all bound index conditions, not just inequalities, fits into the left-hand side (LHS) datatype. #21758
• The deadlock issue occurring when both a table and its index are deleted concurrently in yb-master has been resolved. #21663
• Fixes a bug that caused incorrect setting of global catalog version mode on TServer start. #21850
• Deprecates the unused enable_pg_savepoints flag to prevent irregular system behaviour. #20918
• Refines the YbGetOrdinaryColumnsNeedingPgRecheck condition to align with the ybIsTupMismatch implementation, ensuring Postgres rechecks index conditions when the "preliminary check" is skipped due to an invalid target key attnum. #21451
• Reduces the frequency of schema version mismatch errors during consecutive DDL operations by ensuring the up-to-date schema is fetched. #21706
• Allows usage of YsqlDdlRollbackEnabled in pggate C++ code by correctly passing the result of YbDdlRollbackEnabled, reducing DDL atomicity g-flag issues in RF 1 clusters. #21706
• Ensures pushed down RowCompareExpressions correctly enforce non-null column references, rectifying previous behavior and enhancing data accuracy. #21847
• The postgres process no longer crashes when running a "show all" command due to correct placement of the yb_enable_ddl_atomicity_infra description. #21947
• Adds a new GFlag ysql_min_new_version_ignored_count to prevent a TServer crash caused by the downward shift in yb-master's catalog version, often surfacing post a PITR restore operation. #21776
• Adjusts the value of YB_AT_REWRITE_ALTER_PRIMARY_KEY to prevent flag clashes and accommodate future upstream PG flags. #22086
• Fills in the "relation" column in pg_locks with the correct table OID after a table rewrite. #22081
• Prevents query layer retries for multi-statement queries to avoid redoing whole queries, ensuring idempotence. #21361
• Prevents unnecessary CPU cycles and log flooding by not reading pg_yb_catalog_version when enable_ysql=false. #22213
• Corrects the log message for successful column drop operations, ensuring accurate representation of DDL operations. #22243

YCQL

• Allows the deletion of the Cassandra role in ycqlsh without it regenerating upon cluster restart, by adding a flag to mark if the role was previously created. #21057

DocDB

• Ensures Create Table operation fails if Alter Replication encounters an error, enhancing the reliability of replication setup. #21732
• Converted the ysql_skip_row_lock_for_update to an auto-flag to resolve compatibility issues during upgrade, preventing incorrect DB record creations that can affect row visibility and integrity. #22057
• Modifies memory consumption calculations for pending operations to ensure accurate rejection of new writes at bootstrap, preventing loading failures. #21254
• Trims large error messages in AsyncRpc::Failed to prevent hitting memory limit and resulting unavailability. #21402
• Renames and updates the description of the flag min_secustomerent_size_to_rollover_at_flush for clarity. #21691
• Changes the class of enable_automatic_tablet_splitting flag from kLocalPersisted (class 2) to kExternal (class 4) to eliminate setup issues with xCluster configurations. #22088
• Fixes a segmentation fault in yb-master by checking for a null pointer before dereferencing it, addressing an issue in the CDC run on 2.23.0.0-b37-arm. #21648
• Allows DML operations on non-replicated databases and blocks DML only on databases in transactional xCluster replication STANDBY mode. Now only databases part of an inbound transactional xCluster replication group in the xCluster safe time map will have DML operations blocked. Also, certain attributes are moved from TServer to TserverXClusterContext. #21245
• Adds a TSAN suppression to manage the apparent race condition in the function boost::regex_match. #21585
• Eliminates potential FATAL errors during reported tabletPB creation by ensuring retrieval of schema version is atomic. #21340
• Enables the session to outlive the callback by holding a shared pointer to it, preventing potential crashes during concurrent DML queries. #21103
• Prevents yb-master crash by ensuring background task isn't deleted before the callback is invoked. #21773
• Enables callback completion wait in PollTransactionStatusBase during shutdown to prevent unexpected process termination. #21773
• Allows viewing of the RPC bind addresses in the master leader UI, especially beneficial in cases like k8s where the RPC bind address with the pod DNS is more useful than the broadcast address. #21959
• Reduces unnecessary logging during checkpoint operations by lowering INFO level logs to DEBUG_LEVEL, enhancing log readability. #21658
• Prevents fatal errors by skipping ReserveMarker/AsyncAppend if the tablet peer has already been shut down. #21769
• Enhances YSQL operation by refining task shutdown procedures and avoiding unnecessary task aborts. #21917
• Enhances load balancer efficiency by refining validation logic to block tablet replica additions only for those with a pending delete in progress on the same server, avoiding potential slowdowns during mass tablet replica moves. #21806
• Avoids multiple destruction of the same database connection, preventing system crashes due to simultaneous connection failures. #21738
• Stops fatal errors caused by the re-use of remote log anchor session during remote bootstrap from a non-leader peer. This fix ensures shared pointers are accurately tracked for tablet_peer objects using the = operator, preventing unintentional destruction of underlying objects. #22007
• Corrects a bug causing some tablet metrics to display incorrect metric_type attribute. #21608
• Enables the skip_table_tombstone_check for colocated tables to prevent errors. #22115
• Initializes prev_op to UNKNOWN to prevent AlmaLinux 8 fastdebug gcc11 compilation failures. #21811
• Delays min_running_ht initialization until after the successful completion of tablet bootstrap to prevent unexpected behaviors. #22099
• Resolves the issue of pg_locks query failure due to missing host node UUID in distributed transactions. #22181
• Eliminates latency spikes in conflicting workloads by preventing redundant ProbeTransactionDeadlock RPCs. #22426

CDC

• Ensures deletion of MemoryContext after each GetChanges RPC to prevent memory leaks. #22328
• Fixes a memory leakage issue in the walsender process by deep freeing the cached record batch after streaming to the client. #21530
• Adds more debug logs in the walsender to aid in investigating issues like linked data loss. #21465
• Adds more debug logs for stress run debugging, skips RollbackToSubTransaction RPC to local TServer if not needed, and enhances debugging of the ListReplicationSlots function. #21780, #21519, #21652
• Removes table level attributes from CDCSDK metrics to avoid TServer crash due to failed DCHECK assertion. #22142
• Fixes the segmentation fault in walsender for dynamic table addition by refreshing stored replica identities and preventing a race condition when creating dynamic tables. #22273
• Solves an issue where CDCSDK incorrectly deduces tablets as not interesting for stream before reaching the configured time limit. #22383
• Enables support for streaming update operations via walsender, enhancing PG compatible logical replication support. Now executes schema changes in the logical replication protocol and maintains a record of changes in each table's read_time_ht hybrid time in the PG catalog. Includes handling late ALTER TABLE responses and addressing incomplete cleanup in the case of a stream creation failure. This feature is disabled under test flag ysql_TEST_enable_replication_slot_consumption. #20725
• Prevents failures in decoding change events by refreshing cached_schema_details when executing a new GetChanges request if the client indicates a necessity for the schema. #20698

yugabyted

• Prevents SyntaxWarning and exceptions when incorrect advertise_address is given by adjusting string literals and adding check for errors. #22552, #22210, #22230

Other

• Fixes hidden split parent tablets wrongly appearing as leaderless in the master's leaderless tablet endpoint, ensuring accurate load balance status and preventing potential issues with Point-in-Time Recovery (PITR) operations. #21371