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TiDB 4.0.13 Release Notes
TiDB 4.0.13 was released on May 28, 2021. New features include support for changing `AUTO_INCREMENT` to `AUTO_RANDOM` and the addition of `infoschema.client_errors_summary` tables. Improvements were made to TiDB, TiKV, PD, TiFlash, and Tools. Bug fixes were also implemented for TiDB, TiKV, TiFlash, and Tools, addressing various issues such as query results, panics, and memory usage.

TiDB 4.0.13 Release Notes

Release date: May 28, 2021

TiDB version: 4.0.13

New Features

  • TiDB

    • Support changing an AUTO_INCREMENT column to an AUTO_RANDOM one #24608
    • Add the infoschema.client_errors_summary tables to help users keep track of the errors that have been returned to clients #23267

Improvements

  • TiDB

    • Avoid frequently reading the mysql.stats_histograms table if the cached statistics is up-to-date to avoid high CPU usage #24352

  • TiKV

    • Make the calculation process of store used size more precise #9904
    • Set more Regions in the EpochNotMatch message to reduce Region misses #9731
    • Speed up freeing the memory accumulated in the long-running cluster #10035

  • PD

    • Optimize the metrics of TSO processing time to help users determine whether the TSO processing time at the PD side is too long #3524
    • Update the dashboard version to v2021.03.12.1 #3469

  • TiFlash

    • Automatically clean archived data to free up disk space

  • Tools

    • Backup & Restore (BR)

      • Support backing up user tables created in the mysql schema #1077
      • Update checkVersion to check the cluster data and the backup data #1090
      • Tolerate a small number of TiKV node failures during backup #1062

    • TiCDC

      • Implement the processor flow control to avoid memory overflow (OOM) #1751
      • Support cleaning up stale temporary files in Unified Sorter and prevent multiple cdc server instances from sharing the same sort-dir directory #1741
      • Add the HTTP handler for the failpoint #1732

Bug Fixes

  • TiDB

    • Fix the panic issue that occurs when the UPDATE statement with a subquery updates the generated column #24658
    • Fix the issue that causes duplicate query results when using the multi-column index for data reads #24634
    • Fix the issue that causes wrong query result when using the BIT type constant as the divisor in the DIV expression #24266
    • Fix the issue that the NO_ZERO_IN_DATE SQL mode does not take effect for the default column value set in DDL statements #24185
    • Fix an issue which causes wrong query results when using UNION between a BIT type column and an INTEGER type column #24026
    • Fix the issue that the TableDual plans are mistakenly created when comparing the BINARY type and the CHAR type #23917
    • Fix the issue that the insert ignore on duplicate statement might unexpectedly delete table records #23825
    • Fix the issue that the Audit plugin causes TiDB panic #23819
    • Fix the issue that the HashJoin operator incorrectly processes the collation #23812
    • Fix the issue of disconnection that occurs when batch_point_get incorrectly handles abnormal values in the pessimistic transaction #23778
    • Fix the issue of inconsistent indexes that occurs when the tidb_row_format_version configuration value is set to 1 and the enable_new_collation value is set to true #23772
    • Fix a bug that occurs when comparing the INTEGER type column with the STRING constant value #23705
    • Fix the error that occurs when the BIT type column is passed into the approx_percent function #23702
    • Fix a bug that causes TiDB to mistakenly report the TiKV server timeout error when executing TiFlash batch requests #23700
    • Fix the issue that the IndexJoin operator returns wrong results on the prefix column index #23691
    • Fix the issue which causes wrong query results because the collation on the BINARY type column is not properly handled #23598
    • Fix the issue of query panic that occurs when the UPDATE statement contains the join query with the HAVING clause #23575
    • Fix the issue that causes TiFlash to return wrong results when using the NULL constant in the comparison expression #23474
    • Fix the issue of wrong results when comparing the YEAR type column with the STRING constant #23335
    • Fix the issue that group_concat panics when session.group_concat_max_len is set too small #23257
    • Fix the issue of wrong query results that occurs when using the BETWEEN expression for the TIME type column #23233
    • Fix the issue of privilege check in the DELETE statements #23215
    • Fix the issue that no error is reported when inserting invalid strings to the DECIMAL type column #23196
    • Fix the issue of parsing error occurred when inserting data to the DECIMAL type columns #23152
    • Fix the issue that the USE_INDEX_MERGE hint does not take effect #22924
    • Fix a bug that the query returns wrong results when using ENUM or SET columns in the WHERE clause as an filter #22814
    • Fix a bug that the query returns wrong results when using the clustered index and the new collation at the same time #21408
    • Fix the panic that occurs when executing ANALYZE with enable_new_collation enabled #21299
    • Fix the issue that SQL views does not correctly handle the default roles associated with the SQL DEFINER #24531
    • Fix the issue that cancelling DDL jobs gets stuck #24445
    • Fix the issue that the concat function incorrectly handles the collation #24300
    • Fix a bug that the query returns wrong results when the SELECT field has an IN subquery and the subquery's outer side contains NULL tuples #24022
    • Fix a bug that TiFlash is chosen wrongly by the optimizer when TableScan is in descending order #23974
    • Fix a bug that the point_get plan returns the column name that is inconsistent with that of MySQL #23970
    • Fix the issue that executing the show table status statement on a database with a upper-cased name returns wrong results #23958
    • Fix a bug that the users who do not have the INSERT and DELETE privileges on a table at the same time can perform the REPLACE operation #23938
    • Fix the issue that the results of the concat/make_set/insert expressions are wrong because the collation is incorrectly handled #23878
    • Fix the panic that occurs when executing a query on the table that has RANGE partitions #23689
    • Fix the issue: In the cluster of an earlier version, if the tidb_enable_table_partition variable is set to false, the tables that contain partitions are handled as non-partitioned tables. Executing batch point get queries on this table, when the cluster is upgraded to a later version, causes connection panic. #23682
    • Fix the issue that when TiDB is configured to listen on TCP and UNIX sockets, the remote hosts over the TCP connection are not correctly validated for connection #23513
    • Fix a bug that the non-default collation causes wrong query results #22923
    • Fix a bug that the Coprocessor Cache panel of Grafana does not work #22617
    • Fix the error that occurs when the optimizer accesses the statistic cache #22565

  • TiKV

    • Fix a bug that TiKV cannot start if the file_dict file is not fully written into the disk that has been full #9963
    • Limit TiCDC's scan speed at 128MB/s by default #9983
    • Reduce the memory usage of TiCDC's initial scan #10133
    • Support the back pressure for TiCDC's scan speed #10142
    • Fix a potential OOM issue by avoiding unnecessary reads to get TiCDC old values #10031
    • Fix a TiCDC OOM issue caused by reading old values #10197
    • Add a timeout mechanism for S3 storages to avoid the client hanging without responses #10132

  • TiFlash

    • Fix the issue that number of delta-merge-tasks is not reported to Prometheus
    • Fix the TiFlash panic issue that occurs during Segment Split
    • Fix the issue that the Region write Duration (write blocks) panel in Grafana is shown in a wrong place
    • Fix the potential issue that the storage engine fails to remove data
    • Fix the issue of incorrect results when casting the TIME type to the INTEGER type
    • Fix a bug that the behavior of the bitwise operator is different from that of TiDB
    • Fix the issue of incorrect results when casting the STRING type to the INTEGER type
    • Fix the issue that consecutive and fast writes might make TiFlash out of memory
    • Fix the potential issue that the exception of null pointer might be raised during the table GC
    • Fix the TiFlash panic issue that occurs when writing data to dropped tables
    • Fix the TiFlash panic issue that occurs during BR restore
    • Fix a bug that the weights of some characters are wrong when using the general CI collation
    • Fix the potential issue that data will be lost in tombstoned tables
    • Fix the issue of incorrect results when comparing the string which contains zero bytes
    • Fix the issue that the logical function returns wrong results if the input column contains null constants
    • Fix the issue that the logical function only accepts the numeric type
    • Fix the issue of incorrect results that occurs when the timestamp value is 1970-01-01 and the timezone offset is negative
    • Fix the issue that hash value of Decimal256 is not stable

  • Tools

    • TiCDC

      • Fix the deadlock issue caused by the flow control when the sorter's input channel has been blocked #1779
      • Fix the issue that the TiKV GC safe point is blocked due to the stagnation of TiCDC changefeed checkpoint #1756
      • Revert the update in explicit_defaults_for_timestamp which requires the SUPER privilege when replicating data to MySQL #1749

    • TiDB Lightning

      • Fix a bug that TiDB Lightning's TiDB-backend cannot load any data when autocommit is disabled