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TiDB 2.1.11 Release Notes

Release date: June 03, 2019

TiDB version: 2.1.11

TiDB Ansible version: 2.1.11


  • Fix the issue that incorrect schema is used for delete from join #10595
  • Fix the issue that the built-in CONVERT() may return incorrect field type #10263
  • Merge non-overlapped feedback when updating bucket count #10569
  • Fix calculation errors of unix_timestamp()-unix_timestamp(now()) #10491
  • Fix the incompatibility issue of period_diff with MySQL 8.0 #10501
  • Skip Virtual Column when collecting statistics to avoid exceptions #10628
  • Support the SHOW OPEN TABLES statement #10374
  • Fix the issue that goroutine leak may happen in some cases #10656
  • Fix the issue that setting the tidb_snapshot variable in some cases may cause incorrect parsing of time format #10637


  • Fix the issue that hots Region may fail to be scheduled due to balance-region #1551
  • Set hotspot related scheduling priorities to high #1551
  • Add two configuration items #1551
    • hot-region-schedule-limit to control the maximum number of concurrent hotspot scheduling tasks
    • hot-region-cache-hits-threshold to identify a hot Region


  • Fix the issue that the learner reads an empty index when there is only one leader and one learner #4751
  • Process ScanLock and ResolveLock in the thread pool with a high priority to reduce their impacts on commands with a normal priority #4791
  • Sync all files of received snapshots #4811


  • TiDB Binlog
    • Limit data deletion speed during GC to avoid QPS degrading caused by WritePause #620

TiDB Ansible

  • Add Drainer parameters #760
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