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TiDB 6.1.2 Release Notes
TiDB 6.1.2 was released on October 24, 2022. The release includes improvements to TiDB, TiKV, Tools, PD, TiFlash, and bug fixes for various issues in each component. The improvements include setting placement rules and TiFlash replicas simultaneously, support for configuring various settings, and enhancing performance. Bug fixes address issues such as incorrect cleanup of privileges, incorrect output, query failures, and performance issues.

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