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TiDB 4.0.6 Release Notes
TiDB 4.0.6 was released on September 15, 2020. New features include TiFlash support for outer join and TiDB Dashboard improvements. Tools like TiCDC and TiKV have also been updated. Bug fixes for TiDB, TiKV, PD, TiFlash, and various tools are included in this release.

TiDB 4.0.6 Release Notes

Release date: September 15, 2020

TiDB version: 4.0.6

New Features

  • TiFlash

    • Support outer join in TiFlash broadcast join

  • TiDB Dashboard

    • Add Query Editor and execution UI (experimental) #713
    • Support store location topology visualization #719
    • Add cluster configuration UI (experimental) #733
    • Support sharing the current session #741
    • Support displaying the number of execution plans in SQL Statement list #746

  • Tools

    • TiCDC (GA since v4.0.6)

Improvements

  • TiDB

    • Replace error codes and messages with standard errors #19888
    • Improve the write performance of partitioned table #19649
    • Record more RPC runtime information in Cop Runtime statistics #19264
    • Forbid creating tables in metrics_schema and performance_schema #19792
    • Support adjusting the concurrency of the union executor #19886
    • Support out join in broadcast join #19664
    • Add SQL digest for the process list #19829
    • Switch to the pessimistic transaction mode for autocommit statement retry #19796
    • Support the %r and %T data format in Str_to_date() #19693
    • Enable SELECT INTO OUTFILE to require the file privilege #19577
    • Support the stddev_pop function #19541
    • Add the TiDB-Runtime dashboard #19396
    • Improve compatibility for the ALTER TABLE algorithms #19364
    • Encode insert/delete/update plans in the slow log plan field #19269

  • TiKV

    • Reduce QPS drop when DropTable or TruncateTable is being executed #8627
    • Support generating metafile of error codes #8619
    • Add performance statistics for cf scan details #8618
    • Add the rocksdb perf context panel in the Grafana default template #8467

  • PD

  • TiFlash

    • Add Grafana panels for data replication (apply Region snapshots and ingest SST files)
    • Add Grafana panels for write stall
    • Add dt_segment_force_merge_delta_rows and dt_segment_force_merge_delta_deletes to adjust the threshold of write stall
    • Support setting raftstore.snap-handle-pool-size to 0 in TiFlash-Proxy to disable applying Region snapshot by multi-thread to reduce memory consumption during data replication
    • Support CN check on https_port and metrics_port

  • Tools

    • TiCDC

      • Skip resolved lock during puller initialization #910
      • Reduce PD write frequency #937

    • Backup & Restore (BR)

      • Add real time cost in summary log #486

    • Dumpling

      • Support outputting INSERT with column names #135
      • Unify the --filesize and --statement-size definitions with those of mydumper #142

    • TiDB Lightning

      • Split and ingest Regions in more precise sizes #369

    • TiDB Binlog

      • Support setting GC time in go time package format #996

Bug Fixes

  • TiDB

    • Fix an issue of collecting the tikv_cop_wait time in metric profile #19881
    • Fix the wrong result of SHOW GRANTS #19834
    • Fix the incorrect query result of != ALL (subq) #19831
    • Fix a bug of converting the enum and set types #19778
    • Add a privilege check for SHOW STATS_META and SHOW STATS_BUCKET #19760
    • Fix the error of unmatched column lengths caused by builtinGreatestStringSig and builtinLeastStringSig #19758
    • If unnecessary errors or warnings occur, the vectorized control expression fall back to their scalar execution #19749
    • Fix the error of the Apply operator when the type of the correlation column is Bit #19692
    • Fix the issue that occurs when the user queries processlist and cluster_log in MySQL 8.0 client #19690
    • Fix the issue that plans of the same type have different plan digests #19684
    • Forbid changing the column type from Decimal to Int #19682
    • Fix the issue that SELECT ... INTO OUTFILE returns the runtime error #19672
    • Fix the incorrect implementation of builtinRealIsFalseSig #19670
    • Fix the issue that the partition expression check misses the parentheses expression #19614
    • Fix a query error when there is an Apply operator upon HashJoin #19611
    • Fix an incorrect result of vectorization that casts Real as Time #19594
    • Fix the bug that the SHOW GRANTS statement shows grants for non-existent users #19588
    • Fix a query error when there is an Apply executor upon IndexLookupJoin #19566
    • Fix the wrong results when converting Apply to HashJoin on a partitioned table #19546
    • Fix incorrect results when there is an IndexLookUp executor on the inner side of an Apply #19508
    • Fix an unexpected panic when using view #19491
    • Fix the incorrect result of the anti-semi-join query #19477
    • Fix the bug that the TopN statistics is not deleted when the statistics is dropped #19465
    • Fix a wrong result caused by mistaken usage of batch point get #19460
    • Fix the bug that a column cannot be found in indexLookupJoin with a virtual generated column #19439
    • Fix an error that different plans of the select and update queries compare datum #19403
    • Fix a data race for TiFlash work index in Region cache #19362
    • Fix the bug that the logarithm function does not show a warning #19291
    • Fix an unexpected error that occurs when TiDB persists data to disks #19272
    • Support using a single partitioned table on the inner side of index join #19197
    • Fix the wrong hash key value generated for decimal #19188
    • Fix the issue that TiDB returns a no regions error when table endKey and Region endKey are the same #19895
    • Fix the unexpected success of alter partition #19891
    • Fix the wrong value of the default maximum packet length allowed for pushed down expressions #19876
    • Fix a wrong behavior for the Max/Min functions on the ENUM/SET columns #19869
    • Fix the read failure from the tiflash_segments and tiflash_tables system tables when some TiFlash nodes are offline #19748
    • Fix a wrong result of the Count(col) aggregation function #19628
    • Fix a runtime error of the TRUNCATE operation #19445
    • Fix the issue that PREPARE statement FROM @Var will fail when Var contains uppercase characters #19378
    • Fix the bug that schema charset modification in an uppercase schema will cause panic #19302
    • Fix the inconsistency of plans between information_schema.statements_summary and explain, when the information contains tikv/tiflash #19159
    • Fix the error in tests that the file does not exist for select into outfile #19725
    • Fix the issue that INFORMATION_SCHEMA.CLUSTER_HARDWARE does not have raid device information #19457
    • Make the add index operation that has a generated column with the case-when expression can exit normally when it encounters a parse error #19395
    • Fix the bug that the DDL operation takes too long to retry #19488
    • Make statements like alter table db.t1 add constraint fk foreign key (c2) references t2(c1) execute without first executing use db #19471
    • Change the dispatch error from the Error to the Info message in the server log file #19454

  • TiKV

    • Fix the estimation error for a non-index column when collation is enabled #8620
    • Fix the issue that Green GC might miss locks during the process of Region transfer #8460
    • Fix a panic issue that occurs when TiKV runs very slowly during Raft membership change #8497
    • Fix the deadlock issue that occurs between the PD client thread and other threads when calling PD sync requests #8612
    • Upgrade jemalloc to v5.2.1 to address the issue of memory allocation in huge page #8463
    • Fix the issue that the unified thread pool hangs for long-running queries #8427

  • PD

    • Add the initial-cluster-token configuration to prevent different clusters from communicating with each other during bootstrap #2922
    • Fix the unit of store limit rate when the mode is auto #2826
    • Fix the issue that some schedulers persist configuration without solving errors #2818
    • Fix the empty HTTP response in scheduler #2871 #2874

  • TiFlash

    • Fix the issue that after renaming the primary key column in previous versions, TiFlash might not start after upgrading to v4.0.4/v4.0.5
    • Fix the exceptions that occur after modifying the column's nullable attribute
    • Fix the crash caused by computing a table's replication status
    • Fix the issue that TiFlash is not available for data reads after users applied unsupported DDL operations
    • Fix the exceptions caused by unsupported collations which are treated as utf8mb4_bin
    • Fix the issue that the QPS panel for the TiFlash coprocessor executor always displays 0 in Grafana
    • Fix the wrong result of the FROM_UNIXTIME function when input is NULL

  • Tools

    • TiCDC

      • Fix the issue that TiCDC leaks memory in some cases #942
      • Fix the issue that TiCDC might panic in Kafka sink #912
      • Fix the issue that CommitTs or ResolvedTs (CRTs) might be less than resolvedTs in puller #927
      • Fix the issue that changefeed might be blocked by MySQL driver #936
      • Fix the incorrect Resolved Ts interval of TiCDC #8573

    • Backup & Restore (BR)

      • Fix a panic that might occur during checksum #479
      • Fix a panic that might occur after the change of PD Leader #496

    • Dumpling

      • Fix the issue that the NULL value for the binary type is not handled properly #137

    • TiDB Lightning

      • Fix the issue that all failed operations of writes and ingests are mistakenly displayed as successful #381
      • Fix the issue that some checkpoint updates might not be written to the database before TiDB Lightning exits #386