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TiDB 4.0.11 Release Notes
TiDB 4.0.11 was released on February 26, 2021. New features include support for `utf8_unicode_ci` and `utf8mb4_unicode_ci` collations. Improvements were made to inner joins, Grafana dashboards, and slow query metrics. Bug fixes address issues with collation, type inference, and function errors. TiKV improvements include support for multiple clusters in Grafana dashboards and bug fixes for memory diagnostics and OOM errors. PD fixes member health metrics and store limit persistence issues. TiFlash bug fixes address decimal type results, data loss, and crash issues. Tools like TiCDC, BR, and TiDB Lightning also received bug fixes and improvements.

TiDB 4.0.11 Release Notes

Release date: February 26, 2021

TiDB version: 4.0.11

New Features

  • TiDB

    • Support the utf8_unicode_ci and utf8mb4_unicode_ci collations #22558

  • TiKV

    • Support the utf8mb4_unicode_ci collation #9577
    • Support the cast_year_as_time collation #9299

  • TiFlash

    • Add a Coprocessor thread pool to queue Coprocessor requests for execution, which avoids out of memory (OOM) in some cases, and add the cop_pool_size and batch_cop_pool_size configuration items with the default values of NumOfPhysicalCores * 2

Improvements

  • TiDB

    • Reorder inner joins that are simplified from outer joins #22402
    • Support multiple clusters in Grafana dashboards #22534
    • Add a workaround for the issue of multiple statements #22468
    • Divide the metrics of slow query into internal and general #22405
    • Add interface for utf8_unicode_ci and utf8mb4_unicode_ci collations #22099

  • TiKV

    • Add metrics of server information for DBaaS #9591
    • Support multiple clusters in Grafana dashboards #9572
    • Report RocksDB metrics to TiDB #9316
    • Record the suspension time for Coprocessor tasks #9277
    • Add thresholds of key counts and key size for Load Base Split #9354
    • Check whether the file exists before data import #9544
    • Improve Fast Tune panels #9180

  • PD

    • Support multiple clusters in Grafana dashboards #3398

  • TiFlash

    • Optimize the performance of the date_format function
    • Optimize the memory consumption of handling ingest SST
    • Optimize the retrying logic in Batch Coprocessor to reduce the probability of Region error

  • Tools

    • TiCDC

      • Add the version information in the capture metadata and add the CLI version of a changefeed in the changefeed metadata #1342

    • TiDB Lightning

      • Create tables in parallel to improve import performance #502
      • Skip splitting Regions to improve import performance if the engine's total size is smaller than the Region size #524
      • Add a import progress bar and optimize the accuracy of restore progress #506

Bug Fixes

  • TiDB

    • Fix the issue of abnormal unicode_ci constant propagation #22614
    • Fix the issue that might cause wrong collation and coercibility #22602
    • Fix the issue that might cause wrong collation results #22599
    • Fix the issue of constant substitution for different collations #22582
    • Fix a bug that the like function might return wrong result when using collation #22531
    • Fix the issue of incorrect duration type inference in least and greatest functions #22580
    • Fix a bug that occurs when the like function handles a single character wildcard (_) followed by a multiple character wildcard (%) #22575
    • Fix the type inference error of the TiDB's built-in functions (least and greatest) #22562
    • Fix a bug that makes the like function get the wrong result if the pattern string is a unicode string #22529
    • Fix a bug that the point get query does not get the snapshot data when the @@tidb_snapshot variable is set #22527
    • Fix the potential panic that occurs when generating hints from joins #22518
    • Fix the issue that strings are incorrectly converted to the BIT type #22420
    • Fix the index out of range error that occurs when inserting values to the tidb_rowid column #22359
    • Fix a bug that the cached plan is incorrectly used #22353
    • Fix the runtime panic in the WEIGHT_STRING function when the length of the binary/char string is too large #22332
    • Forbid using the generated column when the number of function parameters is invalid #22174
    • Correctly set the process information before building the execution plan #22148
    • Fix the issue of inaccurate runtime statistics of IndexLookUp #22136
    • Add cache for the memory usage information when the cluster is deployed in a container #22116
    • Fix the issue of the decoding plan errors #22022
    • Report errors for using invalid window specifications #21976
    • Report errors when the PREPARE statement is nested with EXECUTE, DEALLOCATE or PREPARE #21972
    • Fix the issue that no error is reported when the INSERT IGNORE statement is used on a non-existing partition #21971
    • Unify the encoding of EXPLAIN results and slow log #21964
    • Fix the issue of unknown columns in join when using the aggregate operator #21957
    • Fix the wrong type inference in the ceiling function #21936
    • Fix the issue that the Double type column ignores its decimal #21916
    • Fix the issue that the correlated aggregation is calculated in subqueries #21877
    • Report errors for the JSON object with key length >= 65536 #21870
    • Fix the issue that the dyname function is incompatible with MySQL #21850
    • Fix the issue that the to_base64 function returns NULL when the input data is too long #21813
    • Fix the failure of comparing multiple fields in the subquery #21808
    • Fix the issue that occurs when comparing the float type in JSON #21785
    • Fix the issue that occurs when comparing the types of JSON objects #21718
    • Fix the issue that the coercibility value of the cast function is incorrectly set #21714
    • Fix an unexpected panic when using the IF function #21711
    • Fix the issue that the NULL result returned from JSON search is incompatible with MySQL #21700
    • Fix the issue that occurs when checking the only_full_group_by mode using ORDER BY and HAVING #21697
    • Fix the issue that the units of Day and Time are incompatible with MySQL #21676
    • Fix the issue that the default values of LEAD and LAG cannot adapt to the field type #21665
    • Perform a check to ensure that the LOAD DATA statement can only load data into base tables #21638
    • Fix the issue that occurs when addtime and subtime functions handle invalid arguments #21635
    • Change the round rule for approximate values to "round to the nearest even number" #21628
    • Fix the issue that WEEK() does not recognize @@GLOBAL.default_week_format until it has been explicitly read #21623

  • TiKV

    • Fix the issue that TiKV is failed to build with PROST=1 #9604
    • Fix the unmatched memory diagnostics #9589
    • Fix the issue that the end key of a partial RawKV-restore range is inclusive #9583
    • Fix the issue of TiKV panic that occurs when loading the old value of a key of a rolled-back transaction during TiCDC's incremental scan #9569
    • Fix the configuration glitch of old values when changefeeds with different settings connect to one Region #9565
    • Fix a crash issue that occurs when running a TiKV cluster on a machine with a network interface that lacks the MAC address (introduced in v4.0.9) #9516
    • Fix the issue of TiKV OOM when backing up a huge Region #9448
    • Fix the issue that region-split-check-diff cannot be customized #9530
    • Fix the issue of TiKV panic when the system time goes back #9542

  • PD

    • Fix the issue that member health metrics are incorrectly displayed #3368
    • Forbid removing the tombstone store that still has peers #3352
    • Fix the issue that the store limit cannot be persisted #3403
    • Fix the limit constriction of the scatter range scheduler #3401

  • TiFlash

    • Fix a bug that the min/max result is wrong for the decimal type
    • Fix a bug that TiFlash might crash when reading data
    • Fix the issue that some data written after DDL operations might be lost after data compaction
    • Fix the issue that TiFlash incorrectly handles decimal constants in Coprocessor
    • Fix the potential crash during the learner read process
    • Fix the inconsistent behaviors of division by 0 or NULL between TiDB and TiFlash

  • Tools

    • TiCDC

      • Fix a bug that the TiCDC service might unexpectedly exit when ErrTaskStatusNotExists and the closing of capture session occur at the same time #1240
      • Fix the old value switch issue that a changefeed might be affected by another changefeed #1347
      • Fix a bug that the TiCDC service might hang when processing a new changefeed with the invalid sort-engine parameter #1309
      • Fix the issue of panic that occurs when getting the debugging information on non-owner nodes #1349
      • Fix the issue that the ticdc_processor_num_of_tables and ticdc_processor_table_resolved_ts metrics are not properly updated when adding or removing tables #1351
      • Fix the issue of potential data loss if a processor crashes when adding a table #1363
      • Fix a bug that the owner might lead to abnormal TiCDC server exits during table migrations #1352
      • Fix a bug that TiCDC does not exit in time after the service GC safepoint is lost #1367
      • Fix a bug that the KV client might skip creating the event feed #1336
      • Fix a bug that the atomicity of transactions is broken when the transactions are replicated to the downstream #1375

    • Backup & Restore (BR)

      • Fix the issue that TiKV might be caused to generate a big Region after BR restores the backup #702
      • Fix the issue that BR restores a table's Auto ID even if the table does not have Auto ID #720

    • TiDB Lightning

      • Fix a bug that column count mismatch might be triggered when using the TiDB-backend #535
      • Fix a bug that TiDB-backend panics if the column count of the source file and the column count of the target table mismatch #528
      • Fix a bug that TiKV might unexpectedly panic during TiDB Lightning's data import #554