release-2.1.11.md

title	aliases
TiDB 2.1.11 Release Notes	/docs/dev/releases/release-2.1.11/ /docs/dev/releases/2.1.11/

TiDB 2.1.11 Release Notes

Release date: June 03, 2019

TiDB version: 2.1.11

TiDB Ansible version: 2.1.11

TiDB

• 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

PD

• 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

TiKV

• 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

Tools

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

TiDB Ansible

• Add Drainer parameters #760