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TiDB 5.1.5 Release Notes
TiDB 5.1.5 was released on December 28, 2022. The release includes compatibility changes and numerous bug fixes for TiDB, TiKV, PD, TiFlash, and various tools. Bug fixes address issues such as panics, wrong results, and incorrect behaviors. Fixes also include issues related to data loss, memory usage, and incorrect metrics.

TiDB 5.1.5 Release Notes

Release date: December 28, 2022

TiDB version: 5.1.5

Quick access: Quick start | Production deployment

Compatibility changes

  • PD

    • Disable compiling swagger server by default #4932

Bug fixes

  • TiDB

    • Fix the issue that the window function causes TiDB to panic instead of reporting an error #30326
    • Fix the wrong result that occurs when enabling dynamic mode in partitioned tables for TiFlash #37254
    • Fix wrong results of GREATEST and LEAST when passing in unsigned BIGINT arguments #30101
    • Fix wrong results of deleting data of multiple tables using left join #31321
    • Fix the issue that the result of concat(ifnull(time(3))) in TiDB is different from that in MySQL #29498
    • Fix the issue that the SQL statements that contain cast(integer as char) union string return wrong results #29513
    • Fix the issue that INL_HASH_JOIN might hang when used with LIMIT #35638
    • Fix the wrong ANY_VALUE result that occurs when a Region returns empty data #30923
    • Fix wrong results of index join caused by an innerWorker panic #31494
    • Fix the issue that a SQL operation is canceled when its JSON type column joins its CHAR type column #29401
    • Fix the issue that the background HTTP service of TiDB might not exit successfully and makes the cluster in an abnormal state #30571
    • Fix the issue that concurrent column type change causes inconsistency between the schema and the data #31048
    • Fix the issue that KILL TIDB cannot take effect immediately on idle connections #24031
    • Fix the bug that setting any session variable will make tidb_snapshot fail to work #35515
    • Fix the issue that the Region cache is not cleaned up in time when the Region is merged #37141
    • Fix the panic issue caused by the connection array race in the KV client #33773
    • Fix the issue that when TiDB Binlog is enabled, executing the ALTER SEQUENCE statement might cause a wrong metadata version and cause Drainer to exit #36276
    • Fix the bug that TiDB may panic when querying statement summary tables #35340
    • Fix the issue that TiDB gets the wrong result when using TiFlash to scan tables with empty range although TiFlash does not support reading tables with empty range yet #33083
    • Fix the issue that the avg() function returns ERROR 1105 (HY000): other error for mpp stream: Could not convert to the target type - -value is out of range. when queried from TiFlash #29952
    • Fix the issue that ERROR 1105 (HY000): close of nil channel is returned when using HashJoinExec #30289
    • Fix the issue that TiKV and TiFlash return different results when querying logical operations #37258
    • Fix the issue that the EXECUTE statement might throw an unexpected error in specific scenarios #37187
    • Fix the planner wrong behaviors that occur when tidb_opt_agg_push_down and tidb_enforce_mpp are enabled #34465
    • Fix a bug that TiDB might send coprocessor requests when executing the SHOW COLUMNS statement #36496
    • Add warnings for lock tables and unlock tables when the enable-table-lock flag is not enabled #28967
    • Fix the issue that range partitions allow multiple MAXVALUE partitions #36329

  • TiKV

    • Fix the issue of time parsing error that occurs when the DATETIME values contain a fraction and Z #12739
    • Fix a bug that replica reads might violate the linearizability #12109
    • Fix a bug that Regions might be overlapped if Raftstore is busy #13160
    • Fix the TiKV panic issue that occurs when applying snapshot is aborted #11618
    • Fix a bug that TiKV might panic if it has been running for 2 years or more #11940
    • Fix the panic issue that might occur when the source peer catches up logs by snapshot in the Region merge process #12663
    • Fix the issue that TiKV panics when performing type conversion for an empty string #12673
    • Fix a bug that stale messages cause TiKV to panic #12023
    • Fix the panic issue that might occur when a peer is being split and destroyed at the same time #12825
    • Fix the TiKV panic issue that occurs when the target peer is replaced with the peer that is destroyed without being initialized when merging a Region #12048
    • Fix the issue that TiKV reports the invalid store ID 0 error when using Follower Read #12478
    • Fix the possible duplicate commit records in pessimistic transactions when async commit is enabled #12615
    • Support configuring the unreachable_backoff item to avoid Raftstore broadcasting too many messages after one peer becomes unreachable #13054
    • Fix the issue that successfully committed optimistic transactions may report the Write Conflict error when the network is poor #34066
    • Fix the wrong expression of Unified Read Pool CPU in dashboard #13086

  • PD

    • Fix the issue that a removed tombstone store appears again after the PD leader transfer ​​#4941
    • Fix the issue that scheduling cannot start immediately after the PD leader transfer #4769
    • Fix the wrong status code of not leader #4797
    • Fix the issue that PD cannot correctly handle dashboard proxy requests #5321
    • Fix a bug of TSO fallback in some corner cases #4884
    • Fix the issue that the TiFlash learner replica might not be created in specific scenarios #5401
    • Fix the issue that the label distribution has residual labels in the metrics #4825
    • Fix the issue that when there exists a Store with large capacity (2T for example), fully allocated small Stores cannot be detected, which results in no balance operator being generated #4805
    • Fix the issue that schedulers do not work when SchedulerMaxWaitingOperator is set to 1 #4946

  • TiFlash

    • Fix incorrect microsecond when casting string to datetime #3556
    • Fix the panic issue that occurs when TLS is enabled #4196
    • Fix a bug that TiFlash might crash due to an error in parallel aggregation #5356
    • Fix the issue that a query containing JOIN might be hung if an error occurs #4195
    • Fix the issue that the function OR returns wrong results #5849
    • Fix the bug that invalid storage directory configurations lead to unexpected behaviors #4093
    • Fix potential data inconsistency after a lot of INSERT and DELETE operations #4956
    • Fix a bug that data not matching any region range remains on a TiFlash node #4414
    • Fix the potential query error after adding columns under heavy read workload #3967
    • Fix repeated crashes caused by the commit state jump backward errors #2576
    • Fix potential errors when querying on a table with many delete operations #4747
    • Fix the issue that the date format identifies '' as an invalid separator #4036
    • Fix the wrong result that occurs when casting DATETIME to DECIMAL #4151
    • Fix the bug that some exceptions are not handled properly #4101
    • Fix the issue that Prepare Merge might damage the metadata of the raft store and cause TiFlash to restart #3435
    • Fix a bug that an MPP query might fail due to random gRPC keepalive timeout #4662
    • Fix the issue that the result of IN is incorrect in multi-value expressions #4016
    • Fix a bug that MPP tasks might leak threads forever #4238
    • Fix the issue that expired data is recycled slowly #4146
    • Fix the overflow that occurs when casting FLOAT to DECIMAL #3998
    • Fix the issue that logical operators return wrong results when the argument type is UInt8 #6127
    • Fix the potential index out of bounds error if calling json_length with empty string #2705
    • Fix wrong decimal comparison results in corner cases #4512
    • Fix TiFlash_schema_error reported when NOT NULL columns are added #4596
    • Fix the issue that TiFlash bootstrap fails when 0.0 is used as the default value for integers, for example, `i` int(11) NOT NULL DEFAULT '0.0' #3157

  • Tools

    • TiDB Binlog

      • Fix the issue that Drainer cannot send requests to Pump correctly when compressor is set to zip #1152

    • Backup & Restore (BR)

      • Fix the issue that system tables cannot be restored because concurrently backing up system tables makes the table name fail to update #29710

    • TiCDC

      • Fix data loss that occurs in special incremental scanning scenarios #5468
      • Fix the issue that there are no sorter metrics #5690
      • Fix excessive memory usage by optimizing the way DDL schemas are buffered #1386