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release-3.1.0-ga.md

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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 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