2017-03-20-tidb-weekly.md

title	date	summary	tags
Weekly update (March 13 ~ March 19, 2017)	2017-03-20	Last week, we landed 33 PRs in the TiDB repositories and 10 PRs in the TiKV repositories.	TiDB TiKV

Weekly update in TiDB

Last week, we landed 33 PRs in the TiDB repositories.

Added

• Add system table mysql.stats_meta: used for storing statistic information.

• Add a Restful API to get region info from pd.

• Add a system variable to control the behavior of unfolding subquery in in expression.

• Add many builtin functions: acos, asin, atan, make_set, oct, pi, lpad, radians, exp, ip_v6

Fixed

• Check truncated UTF8 string when casting value.

• Fix data race.

• Stop the service when meet critical error.

• Keep the return value of builtin function conv consistent with MySQL when meet invalid input.

Improved

• Refactor tikv coprocessor client: make code cleaner and fix memory leak.

• Refactor code about aggregation pushdown and aggregation prunning: make code cleaner.

New Contributors

Thank you guys!

• Huxley Hu

• Zhao Yi Jun

• silenceper

• Rick Yu

• Qiannan

• Tao Meng

• yangwenmai

• Hongyuan Wang

• 8cbx

• alston111111

• Du Chuan

Weekly update in TiKV

Last week, We landed 10 PRs in the TiKV repositories.

Added

• Use SSE support by default.

• Handle [CTRL + D] in pd-ctl (tikv/pd#570)

Fixed

• Avoid panic when get the tombstone store information.

• Check epoch in ReadIndex to avoid stale read.

• Clean ReadIndex callback when peer is destroyed to avoid deadlock.

Improved

• Queue vote to prevent followers from discarding it if region hasn’t been split.

• Improve random picking region from cache.