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TiDB 3.1.0 GA Release Notes
/docs/dev/releases/release-3.1.0-ga/
/docs/dev/releases/3.1.0-ga/
TiDB 3.1.0 GA was released on April 16, 2020. It includes compatibility changes, new features, bug fixes, and improvements for TiDB, TiFlash, TiKV, and tools like Backup & Restore and TiDB Binlog. Notable changes include support for displaying Coprocessor tasks, optimizing hot Region scheduling, and fixing various panic and data loss issues. The release also includes improvements to TiDB Ansible for better monitoring and configuration parameters.

TiDB 3.1.0 GA Release Notes

Release date: April 16, 2020

TiDB version: 3.1.0 GA

TiDB Ansible version: 3.1.0 GA

Compatibility Changes

  • TiDB

    • Support directly stopping starting TiDB if the HTTP listening port is unavailable when the report-status configuration item is enabled #16291

  • Tools

    • Backup & Restore (BR)

      • BR does not support restoring data from the TiKV cluster earlier than 3.1 GA #233

New Features

  • TiDB

    • Support displaying the information of Coprocessor tasks in explain format = "dot" #16125
    • Reduce the redundant stack information of log using the disable-error-stack configuration item #16182

  • Placement Driver (PD)

    • Optimize the hot Region scheduling #2342

  • TiFlash

    • Add the metrics report related to the read and write workloads of DeltaTree engine
    • Support pushing down the fromUnixTime and dateFormat functions
    • Disable the rough set filter by default

  • TiDB Ansible

Bug Fixes

  • TiDB

    • Fix the panic issue caused by the merge join operation in some scenarios #15920
    • Fix the issue that some expressions are repeatedly counted in selectivity calculation #16052
    • Fix the panic issue occurred when loading the statistics information in extreme cases #15710
    • Fix the issue that an error is returned in some cases when equivalent expressions cannot be recognized in SQL query #16015
    • Fix the issue that an error is returned when querying the view of one database from another database #15867
    • Fix the panic issue that occurs when the column is handled using fast analyze #16080
    • Fix the incorrect character set of the current_role print result #16084
    • Refine the log of MySQL connection handshake error #15799
    • Fix the panic issue caused by port probing after the audit plugin is loaded #16065
    • Fix the panic issue of the sort operator on left join because the TypeNull class is mistaken as a variable-length type #15739
    • Fix the issue of inaccurate count of monitoring session retry errors #16120
    • Fix the issue of wrong results of weekday in the ALLOW_INVALID_DATES mode #16171
    • Fix the issue that Garbage Collection (GC) might not work normally when the cluster has TiFlash nodes #15761
    • Fix the issue that TiDB goes out of memory (OOM) when users set a large partition count when creating the hash partitioned table #16219
    • Fix the issue that warnings are mistaken as errors, and make the UNION statement have the same behavior as the SELECT statement #16138
    • Fix the execution error when TopN is pushed down to mocktikv #16200
    • Increase the initial length of chunk.column.nullBitMap to avoid unnecessary overhead of runtime.growslice #16142

  • TiKV

    • Fix the panic issue caused by replica read #7418 #7369
    • Fix the issue that the restoration process creates empty Regions #7419
    • Fix the issue that repeated resolve lock requests might harm the atomicity of pessimistic transactions #7389

  • TiFlash

    • Fix the potential issue of the rename table operation when replicating the schema from TiDB
    • Fix the issue of data loss caused by the rename table operation under multiple data path configurations
    • Fix the issue that TiFlash reports incorrect storage space in some scenarios
    • Fix the potential issue caused by reading from TiFlash when Region Merge is enabled

  • Tools

    • TiDB Binlog

      • Fix the issue that TiFlash-related DDL jobs might interrupt the replication of Drainer #948 #942

    • Backup & Restore (BR)

      • Fix the issue that the checksum operation is still executed when it is disabled #223
      • Fix the issue that incremental backup fails when TiDB enables auto-random or alter-pk #230 #231