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TiDB 2.1.14 Release Notes

Release date: July 04, 2019

TiDB version: 2.1.14

TiDB Ansible version: 2.1.14


  • Fix wrong query results caused by column pruning in some cases #11019
  • Fix the wrongly displayed information in db and info columns of show processlist #11000
  • Fix the issue that MAX_EXECUTION_TIME as a SQL hint and global variable does not work in some cases #10999
  • Support automatically adjust the incremental gap allocated by auto-increment ID based on the load #10997
  • Fix the issue that the Distsql memory information of MemTracker is not correctly cleaned when a query ends #10971
  • Add the MEM column in the information_schema.processlist table to describe the memory usage of a query #10896
  • Add the max_execution_time global system variable to control the maximum execution time of a query #10940
  • Fix the panic caused by using unsupported aggregate functions #10911
  • Add an automatic rollback feature for the last transaction when the load data statement fails #10862
  • Fix the issue that TiDB returns a wrong result in some cases when the OOMAction configuration item is set to Cancel #11016
  • Disable the TRACE statement to avoid the TiDB panic issue #11039
  • Add the mysql.expr_pushdown_blacklist system table that dynamically enables/disables pushing down specific functions to Coprocessor #10998
  • Fix the issue that the ANY_VALUE function does not work in the ONLY_FULL_GROUP_BY mode #10994
  • Fix the incorrect evaluation caused by not doing a deep copy when evaluating the user variable of the string type #11043


  • Optimize processing the empty callback when processing the Raftstore message to avoid sending unnecessary message #4682


  • Adjust the log output level from Error to Warning when reading an invalid configuration item #1577


TiDB Binlog

  • Reparo
    • Add the safe-mode configuration item, and support importing duplicated data after this item is enabled #662
  • Pump
    • Add the stop-write-at-available-space configuration item to limit the available binlog space #659
    • Fix the issue that Garbage Collector does not work sometimes when the number of LevelDB L0 files is 0 #648
    • Optimize the algorithm of deleting log files to speed up releasing the space #648
  • Drainer
    • Fix the failure to update BIT columns in the downstream #655

TiDB Ansible

  • Add the precheck feature for the ansible command and its jmespath and jinja2 dependency packages #807
  • Add the stop-write-at-available-space parameter (10 GiB by default) in Pump, and stop writing binlog files in Pump when the available disk space is less than the parameter value #807

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