2018-01-29-tidb-weekly.md

title	Weekly update (January 22 ~ January 28, 2018)
date	2018-01-29
summary	Last week, we landed 28 PRs in the TiDB repositories, 4 PRs in the TiSpark repositories, and 17 PRs in the TiKV and PD repositories.
tags	TiDB TiKV PD TiSpark

Weekly update in TiDB

Last week, we landed 28 PRs in the TiDB repositories.

Added

• Add the importer tool
• Add metrics for GC failure count
• Add metrics for TiDB-server panic
• Add metrics for async secondary lock cleanup
• Support create time in information_schema

Removed

• Remove GetSessionVars() in expression evaluation
• Remove varsutil package, and make Systems a private member of SessionVars

Fixed

• Avoid the generation of mysql.TypeNewDate
• Push down binaryliterals as varstring

Improved

• Keep slow query log entry in order
• Make list.MemoryUsage() more efficient
• Limit statement count in a transaction
• Remove WithCancel in copIterator
• Uniform the way of iterating rows within a Chunk

Weekly update in TiSpark

Last week, we landed 4 PRs in the TiSpark repositories.

Improved

• Improve index double read performance by around 30%
• Verify and add document for Hive integration

Fixed

• Fix test for between expression
• Add placeholder for unsupported type preventing schema reading crash

Weekly update in TiKV and PD

Last week, we landed 17 PRs in the TiKV and PD repositories.

Added

• Add ImportSST/UploadSST API
• Add drop region admin command

Fixed

• Convert int to decimal in sum
• Fix join failure when log dir is the same as data dir
• Disable the portable on MacOS

Improved

• Limit data size for scan lock
• Add metrics for checkers
• Remove schedule empty apply task
• Ignore Prometheus encoding error
• Debug trait for snapshot
• Reduce the lock overhead
• Update the region size

New contributor (Thanks!)

• TiDB: yuananf