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TiDB 4.0.0 Beta.2 Release Notes
/docs/dev/releases/release-4.0.0-beta.2/
/docs/dev/releases/4.0.0-beta.2/
TiDB 4.0.0 Beta.2 was released on March 18, 2020. The new features include support for persisting dynamically updated configurations, bidirectional data replication, TLS configuration, change data capture, and experimental features like incremental backup. Bug fixes address issues with panic, hibernate regions, replication delay, and compatibility. TiDB Ansible now supports injecting node information to etcd and deploying services on the ARM platform.

TiDB 4.0.0 Beta.2 Release Notes

Release date: March 18, 2020

TiDB version: 4.0.0-beta.2

TiDB Ansible version: 4.0.0-beta.2

Compatibility Changes

  • Tools
    • TiDB Binlog
      • Fix the issue that the system returns an error and exits when disable-dispatch and disable-causality are configured in Drainer #915

New Features

  • TiKV

    • Support persisting the dynamically updated configuration into the hardware disk #6684

  • PD

    • Support persisting the dynamically updated configuration into the hardware disk #2153

  • Tools

    • TiDB Binlog
      • Support the bidirectional data replication between TiDB clusters #879 #903
    • TiDB Lightning
      • Support the TLS configuration #40 #270
    • TiCDC
      • Initial release of the change data capture (CDC), providing the following features:
        • Support capturing changed data from TiKV
        • Support replicating the changed data from TiKV to MySQL compatible databases, and guarantee the eventual data consistency
        • Support replicating the changed data to Kafka, and guarantee either the eventual data consistency or the row-level orderliness
        • Provide process-level high availability
    • Backup & Restore (BR)
      • Enable experimental features such as incremental backup and backing up files to Amazon S3 #175

  • TiDB Ansible

    • Support injecting the node information to etcd #1196
    • Support deploying TiDB services on the ARM platform #1204

Bug Fixes

  • TiKV

    • Fix the panic issue that might occur when meeting empty short values during the backup #6718
    • Fix the issue that Hibernate Regions might not be correctly awakened in some cases #6772 #6648 #6376

  • PD

    • Fix the panic issue that the rule checker fails to allocate stores to Regions #2160
    • Fix the issue that after the dynamic configuration is enabled, the configuration might have replication delay when the Leader is being switched #2154

  • Tools

    • Backup & Restore (BR)
      • Fix the issue that BR might fail to restore data of a large size because PD cannot process large-sized data #167
      • Fix the BR failure occurred because the BR version is not compatible with the TiDB version #186
      • Fix the BR failure occurred because the BR version is not compatible with TiFlash #194