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release-4.0.10.md

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TiDB 4.0.10 Release Notes
TiDB 4.0.10 was released on January 15, 2021. New features include redacting user data from logs and configurable size limits for key-value entries. Bug fixes address concurrency issues, duplicate bindings, and incorrect results. Improvements include optimized metrics and upgraded dependencies. Various tools have also been updated and fixed, such as TiCDC, Dumpling, Backup & Restore, TiDB Binlog, and TiDB Lightning.

TiDB 4.0.10 Release Notes

Release date: January 15, 2021

TiDB version: 4.0.10

New Features

  • PD

    • Add the enable-redact-log configuration item to redact user data from logs #3266

  • TiFlash

    • Add the security.redact_info_log configuration item to redact user data from logs

Improvements

  • TiDB

    • Make the size limit of a key-value entry in transaction configurable using txn-entry-size-limit #21843

  • PD

    • Optimize the store-state-filter metrics to show more information #3100
    • Upgrade the go.etcd.io/bbolt dependency to v1.3.5 #3331

  • Tools

    • TiCDC

      • Enable the unified sorter feature by default #1230

    • Dumpling

      • Support checking unrecognized arguments and printing the current progress during dumping #228

    • TiDB Lightning

      • Support retrying the error that occurs when reading from S3 #533

Bug Fixes

  • TiDB

    • Fix a concurrency bug that might cause the batch client timeout #22336
    • Fix the issue of duplicate bindings caused by concurrent baseline capture #22295
    • Make the baseline capture bound to the SQL statement work when the log level is 'debug' #22293
    • Correctly release GC locks when Region merge occurs #22267
    • Return correct values for user variables of the datetime type #22143
    • Fix the issue of using index merge when there are multiple table filters #22124
    • Fix the wrong precision issue in TiFlash caused by the prepare plan cache #21960
    • Fix the issue of incorrect results caused by schema change #21596
    • Avoid unnecessary column flag changes in ALTER TABLE #21474
    • Set the database name for table aliases of query blocks used in optimizer hints #21380
    • Generate the proper optimizer hint for IndexHashJoin and IndexMergeJoin #21020

  • TiKV

    • Fix the wrong mapping between ready and peer #9409
    • Fix the issue that some logs are not redacted when security.redact-info-log is set to true #9314

  • PD

    • Fix the issue that the ID allocation is not monotonic #3308 #3323
    • Fix the issue that the PD client might be blocked in some cases #3285

  • TiFlash

    • Fix the issue that TiFlash fails to start because TiFlash fails to process the TiDB schema of an old version
    • Fix the issue that TiFlash fails to start due to incorrect handling of cpu_time on the RedHat system
    • Fix the issue that TiFlash fails to start when path_realtime_mode is set to true
    • Fix an issue of incorrect results when calling the substr function with three parameters
    • Fix the issue that TiFlash does not support changing the Enum type even if the change is lossless

  • Tools

    • TiCDC

      • Fix a bug that outdated metadata might cause the newly created changefeed abnormal #1184
      • Fix the issue of creating the receiver on the closed notifier #1199
      • Fix a bug that the TiCDC owner might consume too much memory in the etcd watch client #1227
      • Fix the issue that max-batch-size does not take effect #1253
      • Fix the issue of cleaning up stale tasks before the capture information is constructed #1280
      • Fix the issue that the recycling of db conn is block because rollback is not called in MySQL sink #1285

    • Dumpling

    • Backup & Restore (BR)

      • Fix the issue that BR v4.0.9 cannot restore the files backed up using BR v4.0.8 on GCS #688
      • Fix the issue that BR panics when the GCS storage URL has no prefix #673
      • Disable backup statistics by default to avoid BR OOM #693

    • TiDB Binlog

      • Fix the issue that when the AMEND TRANSACTION feature is enabled, Drainer might choose the incorrect schema version to generate SQL statements #1033

    • TiDB Lightning

      • Fix a bug that the Region is not split because the Region key is incorrectly encoded #531
      • Fix the issue that the failure of CREATE TABLE might be lost when multiple tables are created #530
      • Fix the issue of column count mismatch when using the TiDB-backend #535