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TiDB RC1 Release Notes
/docs/dev/releases/release-rc.1/
/docs/dev/releases/rc1/
TiDB RC1 was released on December 23, 2016. Updates include improved write speed and reduced disk space usage in TiKV, optimized scheduling strategy framework in PD, and added features in the SQL query optimizer and new tools in TiDB. The release also supports more built-in functions in MySQL and enhances the speed of the `add index` statement.

TiDB RC1 Release Notes

On December 23, 2016, TiDB RC1 is released. See the following updates in this release:

TiKV

  • The write speed has been improved.
  • The disk space usage is reduced.
  • Hundreds of TBs of data can be supported.
  • The stability is improved and TiKV can support a cluster with 200 nodes.
  • Supports the Raw KV API and the Golang client.

Placement Driver (PD)

  • The scheduling strategy framework is optimized and now the strategy is more flexible and reasonable.
  • The support for label is added to support Cross Data Center scheduling.
  • PD Control is provided to operate the PD cluster more easily.

TiDB

  • The following features are added or improved in the SQL query optimizer:
    • Eager aggregation
    • More detailed EXPLAIN information
    • Parallelization of the UNION operator
    • Optimization of the subquery performance
    • Optimization of the conditional push-down
    • Optimization of the Cost Based Optimizer (CBO) framework
  • The implementation of the time related data types are refactored to improve the compatibility with MySQL.
  • More built-in functions in MySQL are supported.
  • The speed of the add index statement is enhanced.
  • The following statements are supported:
    • Use the CHANGE COLUMN statement to change the name of a column.
    • Use MODIFY COLUMN and CHANGE COLUMN of the ALTER TABLE statement for some of the column type transfer.

New tools

  • Loader is added to be compatible with the mydumper data format in Percona and provides the following functions:
    • Multi-thread import
    • Retry if error occurs
    • Breakpoint resume
    • Targeted optimization for TiDB
  • The tool for one-click deployment is added.