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release-4.0.7.md

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TiDB 4.0.7 Release Notes
TiDB 4.0.7 was released on September 29, 2020. New features include the addition of the `GetAllMembers` function in the PD client and support for generating the metrics relationship graph in TiDB Dashboard. Improvements were made to TiDB, TiKV, PD, TiFlash, and various tools. Bug fixes were also implemented for TiDB, TiKV, PD, TiFlash, and tools like Backup & Restore and Dumpling.

TiDB 4.0.7 Release Notes

Release date: September 29, 2020

TiDB version: 4.0.7

New Features

  • PD

    • Add the GetAllMembers function in the PD client to get PD member information #2980

  • TiDB Dashboard

    • Support generating the metrics relationship graph #760

Improvements

  • TiDB

    • Add more runtime information for the join operator #20093
    • Add the hit ratio information of coprocessor cache in EXPLAIN ANALYZE #19972
    • Support pushing down the ROUND function to TiFlash #19967
    • Add the default value of CMSketch for ANALYZE #19927
    • Refine error message desensitization #20004
    • Accept connections from clients using connectors from MySQL 8.0 #19959

  • TiKV

    • Support the JSON log format #8382

  • PD

    • Count schedule operators when they are finished rather than added #2983
    • Set the make-up-replica operator to high priority #2977

  • TiFlash

    • Improve the error handling of the Region meta change that occurs during reads

  • Tools

    • TiCDC

      • Support translating more execution-efficient SQL statements in MySQL sink when the old value feature is enabled #955

    • Backup & Restore (BR)

      • Add connection retry when the connection is broken during backup #508

    • TiDB Lightning

      • Support dynamically updating the log level via the HTTP interface #393

Bug Fixes

  • TiDB

    • Fix a vectorization bug from and/or/COALESCE caused by shortcut #20092
    • Fix the issue that plan digests are the same when the cop task stores are of different types #20076
    • Fix the wrong behavior of the != any() function #20062
    • Fix the query error that occurs when the slow-log file does not exist #20051
    • Fix the issue that Region requests continue to retry when the context is canceled #20031
    • Fix the issue that querying the time type of the cluster_slow_query table in streaming request might result in an error #19943
    • Fix the issue that DML statements using case when might cause schema change #20095
    • Fix the issue that the prev_stmt information in slow log is not desensitized #20048
    • Fix the issue that tidb-server does not release the table lock when it exits abnormally #20020
    • Fix the incorrect error message that occurs when inserting data of the ENUM and SET type #19950
    • Fix the wrong behavior of the IsTrue function in some situations #19903
    • Fix the issue that the CLUSTER_INFO system table might not work normally after PD is scaled in or out #20026
    • Avoid unnecessary warnings or errors when folding constants in control expressions #19910
    • Update the method of updating statistics to avoid Out of Memory (OOM) #20013

  • TiKV

    • Fix the issue of unavailable Status API when TLS handshake fails #8649
    • Fix the potential undefined behaviors #7782
    • Fix the possible panic caused by generating snapshots when executing UnsafeDestroyRange #8681

  • PD

    • Fix the bug that PD might panic if some Regions have no Leader when balance-region is enabled #2994
    • Fix the statistical deviation of Region size and Region keys after Region merge #2985
    • Fix the incorrect hotspot statistics #2991
    • Fix the issue that there is no nil check in redirectSchedulerDelete #2974

  • TiFlash

    • Fix the wrong result of right outer join

  • Tools

    • Backup & Restore (BR)

      • Fix a bug that causes the TiDB configuration to change after the restore process #509

    • Dumpling

      • Fix the issue that Dumpling fails to parse metadata when some variables are NULL #150