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release-4.0.1.md

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title TiDB 4.0.1 Release Notes
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/docs/dev/releases/release-4.0.1/

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    • Fix the issue that a request for read index might get outdated commit index #8043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