TiDB 3.0.19 Release Notes

Release date: September 25, 2020

TiDB version: 3.0.19

Compatibility Changes

• PD

  • Change the import path from pingcap/pd to tikv/pd #2779
  • Change the copyright information from PingCAP, Inc to TiKV Project Authors #2777

Improvements

• TiDB

  • Mitigate the impact of failure recovery on QPS performance #19764
  • Support adjusting the concurrency of the union operator #19885

• TiKV

  • Set sync-log to true as a nonadjustable value #8636

• PD

  • Add an alert rule for PD restart #2789

Bug Fixes

• TiDB

  • Fix the query error that occurs when the slow-log file does not exist #20050
  • Add the privilege check for SHOW STATS_META and SHOW STATS_BUCKET #19759
  • Forbid changing the decimal type to the integer type #19681
  • Fix the issue that the constraint is not checked when altering the ENUM/SET type column #20045
  • Fix the bug that tidb-server does not release table locks after a panic #20021
  • Fix the bug that the OR operator is not handled correctly in the WHERE clause #19901

• TiKV

  • Fix the bug that TiKV panics when parsing responses with missing reason phrases #8540

• Tools

  • TiDB Lightning

    • Fix the issue that the TiDB Lightning process does not exit in time when encountering illegal UTF characters in CSV in the strict mode #378