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Changelog of Vitess v21.0.1

Bug fixes

Backup and Restore

  • [release-21.0] Fix how we cancel the context in the builtin backup engine (#17285) #17291
  • [release-21.0] S3: optional endpoint resolver and correct retrier #17307

Cluster management

  • [release-21.0] Fix panic in vttablet when closing topo server twice (#17094) #17122

Online DDL

  • [release-21.0] Online DDL: fix defer function, potential connection pool exhaustion (#17207) #17210

Query Serving

  • [release-21.0] bugfix: treat EXPLAIN like SELECT (#17054) #17058
  • [release-21.0] Delegate Column Availability Checks to MySQL for Single-Route Queries (#17077) #17087
  • [release-21.0] bugfix: Handle CTEs with columns named in the CTE def (#17179) #17181
  • [release-21.0] Use proper keyspace when updating the query graph of a reference DML (#17226) #17258

Topology

  • [release-21.0] Close zookeeper topo connection on disconnect (#17136) #17193

VReplication

  • [release-21.0] VReplication: Qualify and SQL escape tables in created AutoIncrement VSchema definitions (#17174) #17176

VTTablet

  • [release-21.0] Fix deadlock in messager and health streamer (#17230) #17235
  • [release-21.0] Fix potential deadlock in health streamer (#17261) #17270

CI/Build

Build/CI

  • [release-21.0] Specify Ubuntu 24.04 for all jobs (#17278) #17282

Cluster management

  • [release-21.0] Fix flakiness in TestListenerShutdown (#17024) #17189

General

  • [release-21.0] Upgrade the Golang version to go1.23.3 #17211

Dependencies

Java

  • [release-21.0] java package updates for grpc and protobuf and release plugins (#17100) #17105

Documentation

Documentation

  • [Direct PR][release-21.0] Add RPC changes segment in the summary doc #17034

Enhancement

Online DDL

  • [release-21.0] Improve Schema Engine's TablesWithSize80 query (#17066) #17091

Query Serving

  • [release-21.0] Fix to prevent stopping buffering prematurely (#17013) #17205

VReplication

  • [release-21.0] Binlog: Improve ZstdInMemoryDecompressorMaxSize management (#17220) #17241

Internal Cleanup

Build/CI

  • [release-21.0] Change the name of the vitess-tester repository (#16917) #17030

Regression

Backup and Restore

  • [release-21.0] Fix unreachable errors when taking a backup (#17062) #17112

Release

General

  • [release-21.0] Bump to v21.0.1-SNAPSHOT after the v21.0.0 release #17098

Testing

Build/CI

  • [release-21.0] Flakes: Address flakiness in TestZkConnClosedOnDisconnect (#17194) #17197

Query Serving

  • [release-21.0] fix: flaky test on twopc transaction (#17068) #17070