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TiDB 3.1 Beta Release Notes

Release date: December 20, 2019

TiDB version: 3.1.0-beta

TiDB Ansible version: 3.1.0-beta

TiDB

SQL Optimizer
- Enrich SQL hints #12192
New feature
- Support the Follower Read feature #12535

TiKV

Support the distributed backup and restore feature #5532
Support the Follower Read feature #5562

PD

Support the distributed backup and restore feature #1896

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