TiDB 6.1.2 Release Notes

Release date: October 24, 2022

TiDB version: 6.1.2

Quick access: Quick start | Production deployment

Improvements

• TiDB

  • Allow setting placement rules and TiFlash replicas at the same time in one table #37171 @lcwangchao

• TiKV

  • Support configuring the unreachable_backoff item to avoid Raftstore broadcasting too many messages after one peer becomes unreachable #13054 @5kbpers
  • Support configuring the RocksDB write stall settings to a value smaller than the flow control threshold #13467 @tabokie

• Tools

  • TiDB Lightning

    • Add retryable errors during checksum to improve robustness #37690 @D3Hunter

  • TiCDC

    • Enhance the performance of the region worker by handling resolved TS in a batch #7078 @sdojjy

Bug fixes

• TiDB

  • Fix the issue that database-level privileges are incorrectly cleaned up #38363 @dveeden
  • Fix the incorrect output of SHOW CREATE PLACEMENT POLICY #37526 @xhebox
  • Fix the issue that when one PD node goes down, the query of information_schema.TIKV_REGION_STATUS fails due to not retrying other PD nodes #35708 @tangenta
  • Fix the issue that the UNION operator might return unexpected empty result #36903 @tiancaiamao
  • Fix the wrong result that occurs when enabling dynamic mode in partitioned tables for TiFlash #37254 @wshwsh12
  • Fix the issue that the Region cache is not cleaned up in time when the Region is merged #37141 @sticnarf
  • Fix the issue that the KV client sends unnecessary ping messages #36861 @jackysp
  • Fix the issue that the EXPLAIN ANALYZE statement with DML executors might return result before the transaction commit finishes #37373 @cfzjywxk
  • Fix the issue that GROUP CONCAT with ORDER BY might fail when the ORDER BY clause contains a correlated subquery #18216 @winoros
  • Fix the issue that Can't find column is reported if an UPDATE statement contains common table expressions (CTE) #35758 @AilinKid
  • Fix the issue that the EXECUTE might throw an unexpected error in specific scenarios #37187 @Reminiscent

• TiKV

  • Fix the issue that the snapshot data might be incomplete caused by batch snapshot across Regions #13553 @SpadeA-Tang
  • Fix the issue of QPS drop when flow control is enabled and level0_slowdown_trigger is set explicitly #11424 @Connor1996
  • Fix the issue that causes permission denied error when TiKV gets an error from the web identity provider and fails back to the default provider #13122 @3pointer
  • Fix the issue that the TiKV service is unavailable for several minutes when a TiKV instance is in an isolated network environment #12966 @cosven

• PD

  • Fix the issue that the statistics of the Region tree might be inaccurate #5318 @rleungx
  • Fix the issue that the TiFlash learner replica might not be created #5401 @HunDunDM
  • Fix the issue that PD cannot correctly handle dashboard proxy requests #5321 @HunDunDM
  • Fix the issue that unhealthy Region might cause PD panic #5491 @nolouch

• TiFlash

  • Fix the issue that I/O Limiter might incorrectly throttle the I/O throughput of query requests after bulk writes, which reduces the query performance #5801 @JinheLin
  • Fix the issue that a window function might cause TiFlash to crash when the query is canceled #5814 @SeaRise
  • Fix the panic that occurs after creating the primary index with a column containing the NULL value #5859 @JaySon-Huang

• Tools

  • TiDB Lightning

    • Fix panic of TiDB Lightning caused by invalid metric counters #37338 @D3Hunter

  • TiDB Data Migration (DM)

    • Fix the issue that upstream table structure information is lost when DM tasks enter the sync unit and are interrupted #7159 @lance6716
    • Fix large transaction errors by splitting SQL statements when saving checkpoints #5010 @lance6716
    • Fix the issue that DM precheck requires the SELECT privilege on INFORMATION_SCHEMA #7317 @lance6716
    • Fix the issue that DM-worker triggers a deadlock error after running DM tasks with fast/full validators #7241 @buchuitoudegou
    • Fix the issue that DM reports the Specified key was too long error #5315 @lance6716
    • Fix the issue that latin1 data might be corrupted during replication #7028 @lance6716

  • TiCDC

    • Fix the issue that the cdc server might panic if it receives an HTTP request before the cdc server fully starts #6838 @asddongmen
    • Fix the log flooding issue during upgrade #7235 @hi-rustin
    • Fix the issue that changefeed's redo log files might be deleted by mistake #6413 @hi-rustin
    • Fix the issue that TiCDC might become unavailable when too many operations in an etcd transaction are committed #7131 @hi-rustin
    • Fix the issue that data inconsistency might occur when non-reentrant DDL statements in redo logs are executed twice #6927 @hicqu

  • Backup & Restore (BR)

    • Fix the issue that the regions are not balanced because the concurrency is set too large during the restoration #37549 @3pointer
    • Fix the issue that might lead to backup and restoration failure if special characters exist in the authorization key of external storage #37469 @MoCuishle28