2016-10-24-tidb-weekly.md

layout	title
post	Weekly Update

Last week, we landed 30 PRs in the TiDB repositories and 26 PRs in the TiKV repositories.

Notable changes to TiDB

• Set the concurrency for the SQL executor using the Set statement

• Convert the Limit+Sort operator to the TopN operator on local storage

• Fix the gotouinue leak problem

• Support the logic/bitwise operator on local storage

• Support creating user without password

• Eliminate common aggregation function

• Support the Drop User statement

• Fix bugs

Notable changes to TiKV

• Provide a tool tikv-ctl to browse the internal data in RocksDB.
• Make the Raft column family configurable.
• Avoid deleting other regions' data accidentally.
• Coprocessor supports minus, intdiv and mod operations.
• Support canceling a applying snapshot job which is in queue directly.
• Use get_region_by_id to check the stale region.
• Skip fetching unnecessary values to speed up the scan performance.
• Add flow control to fix issue 1190
• Clean up temporary snapshot file when startup.
• Shrink the send buffer after sending a big query to avoid occupying too much memory.

Notable changes to Placement Driver

• Add uptime to show the online time for a store.
• Embed metapb.Store into storeInfo to make the code cleaner.