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2015/04 1st line of TiDB code

2015/06 1st version of SQL Syntax Parser, Optimizer, and storage engine based on local Key-Value storage

2015/07 Starting to set up the test framework and collect test cases

2015/08 TiDB: compatibile with MySQL protocol and common syntaxes

2015/09 TiDB: open source on Github

2015/11 1st version of the distributed transactional storage engine based on HBase

2015/11 Automatic Continuous Integration and test framework based on Jenkins

2015/12 Starting to design TiKV, a new distributed Key-Value storage engine

2016/01 1st line of TiKV code

2016/03 1st version of the Raft State Machine and the implementation of the distributed transactional algorithm

2016/04 TiKV: open source on Github

2016/05 TiDB starting to support hash join and predicates pushdown

2016/08 Starting to refactor the TiDB optimizer

2016/09 Starting to use Prometheus + Grafana for real-time monitoring

2016/10 TiKV starting to support asynchronous Apply to significantly improve the throughput

2016/11 Decision made to use gRPC to replace the existing RPC framework

2017/01 1st production use of TiDB for the OLTP scenario

2017/06 TiDB gRPC accomplished

2017/07 1st version of TiSpark: sitting SparkSQL on top of TiKV. Distributed HTAP made possible

2017/08 The TiDB Cost Based Optimizer accomplished

to be continued…

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