releases: add the release notes for TiDB 2.0.2

README.md

@@ -117,6 +117,8 @@
 - [Frequently Asked Questions (FAQ)](FAQ.md)
 - [TiDB Best Practices](https://pingcap.github.io/blog/2017/07/24/tidbbestpractice/)
 + [Releases](releases/rn.md)
+  - [2.0.2](releases/202.md)
+  - [2.0.1](releases/201.md)
   - [2.0](releases/2.0ga.md)
   - [2.0 RC5](releases/2rc5.md)
   - [2.0 RC4](releases/2rc4.md)

releases/202.md

@@ -0,0 +1,30 @@
+---
+title: TiDB 2.0.2 Release Notes
+category: Releases
+---
+
+# TiDB 2.0.2 Release Notes
+
+On May 21, 2018, TiDB 2.0.2 is released. Compared with TiDB 2.0.1, this release has great improvement in system stability.
+
+## TiDB
+
+- Fix the issue of pushing down the Decimal division expression
+- Support using the `USE INDEX` syntax in the `Delete` statement
+- Forbid using the `shard_row_id_bits` feature in columns with `Auto-Increment`
+- Add the timeout mechanism for writing Binlog
+
+## PD
+
+- Make the balance leader scheduler filter the disconnected nodes 
+- Modify the timeout of the transfer leader operator to 10s
+- Fix the issue that the label scheduler does not schedule when the cluster Regions are in an unhealthy state
+- Fix the improper scheduling issue of `evict leader scheduler`
+
+## TiKV
+
+- Fix the issue that the Raft log is not printed
+- Support configuring more gRPC related parameters
+- Support configuring the timeout range of leader election
+- Fix the issue that the obsolete learner is not deleted
+- Fix the issue that the snapshot intermediate file is mistakenly deleted

releases/rn.md

@@ -5,6 +5,7 @@ category: release
 
 # TiDB Release Notes
 
+  - [2.0.2](202.md)
   - [2.0.1](201.md)
   - [2.0](2.0ga.md)
   - [2.0 RC5](2rc5.md)