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release-3.0.19.md

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TiDB 3.0.19 Release Notes
TiDB 3.0.19 was released on September 25, 2020. Compatibility changes include import path and copyright information updates. Improvements were made to mitigate failure recovery impact, support concurrency adjustment, and set nonadjustable values. Bug fixes were made for query errors, privilege checks, type changes, constraint checks, table lock release, operator handling, and panic parsing. Tools like TiDB Lightning also received fixes for process exit timing.

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