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release-4.0.1.md

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TiDB 4.0.1 Release Notes
/docs/dev/releases/release-4.0.1/
TiDB 4.0.1 was released on June 12, 2020. New features include support for custom timeout for PD client and new collation framework in TiFlash. Bug fixes address issues with configuration, monitoring metrics, and store information retrieval. Backup & Restore (BR) now includes a version check to avoid compatibility issues.

TiDB 4.0.1 Release Notes

Release date: June 12, 2020

TiDB version: 4.0.1

New Features

  • TiKV

    • Add the --advertise-status-addr start flag to specify the status address to advertise #8046

  • PD

    • Support the internal proxy for the built-in TiDB Dashboard #2511
    • Support setting a custom timeout for PD client #2509

  • TiFlash

    • Support the TiDB new collation framework
    • Support pushing down the If/BitAnd/BitOr/BitXor/BitNot/Json_length functions to TiFlash
    • Support the Resolve Lock logic for large transactions in TiFlash

  • Tools

    • Backup & Restore (BR)

      • Add a version check when starting BR to avoid the issue that BR and the TiDB cluster are incompatible #311

Bug Fixes

  • TiKV

    • Fix the issue that the use-unified-pool configuration in the startup log is incorrectly printed #7946
    • Fix the issue that the tikv-ctl does not support relative path #7963
    • Fix the bug that the monitoring metric of Point Selects is inaccurate #8033
    • Fix the issue that a peer might not be destroyed after the network isolation disappears #8006
    • Fix the issue that a request for read index might get outdated commit index #8043
    • Improve the reliability of backup and restore with S3 and GCS storages #7917

  • PD

    • Prevent misconfiguration of Placement Rules in some situations #2516
    • Fix the issue that deleting the Placement Rule might cause panic #2515
    • Fix a bug that the store information cannot be obtained when the store's used size is zero #2474

  • TiFlash

    • Fix the issue that default value of the bit type column in TiFlash is incorrectly parsed
    • Fix the miscalculation of 1970-01-01 00:00:00 UTC in some timezones in TiFlash