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