Weekly Update 2018-03-26

[zhangyanqing]

New contributors (Thanks!)

• lwh
• csmoe
• wspsxing
• Ryan Brewster

Weekly update in TiDB

Last week, we landed 35 PRs in the TiDB repositories.

Added

• Add the average column size for histogram
• Support STRAIGHT_JOIN to disable join reordering
• Add the AdminChecksumTable command
• Show Region key’s record ID or index values

Fixed

• Support converting json to float64
• Fix incompatible behavior when modifying value from Navicat GUI
• Fix panic by cloning the predicates of UnionScan
• Fix the syntax error on set transaction isolation level serializable
• Fix a data race on the concurrent access of Tracker.children
• Fix a data race for the SelectForUpdate executor

Improved

• Speed up adding index for discrete tables
• Refactor MergeJoin
• Fill the TABLE_ROWS field of information_schema.TABLES with the information from statistics

Weekly update in TiSpark

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

Fixed

• Fix the range of the prefix index
• Fix the bucket loading issue

Weekly update in TiKV and PD

Last week, we landed 26 PRs in the TiKV and PD repositories.

Added

• Dump the snapshot meta file
• Modify the TiKV configuration dynamically
• Implement the checksum push down request
• Support Region merging
• Add the checker for Region merging
• Support TiKV recovering services from the unsafe state of the majority failure of replicas

Fixed

• Replace %I with %H
• Transfer the leader to the new peer when scattering Regions

Improved

• Improve the balance-region scheduler
• Improve the balance-leader scheduler
• Simplify the shuffle-leader scheduler
• Inform PD ASAP after new peers are not pending any more
• Use delete range by default
• Pick the hot Region from the store randomly
• Refactor the worker with crossbeam-channel