2016-12-12-tidb-weekly.md

title	date	summary	tags
Weekly update (December 05 ~ December 11, 2016)	2016-12-12	Last week, we landed 41 PRs in the TiDB repositories and 34 PRs in the TiKV repositories.	TiDB TiKV

Weekly update in TiDB

Last week, we landed 41 PRs in the TiDB repositories.

Added

• Support the built-in function: str_to_date.

• Support built-in function schema().

• Support pushing the case-when expression to TiKV.

• Support changing the type and name of a column.

• Add the ](https://github.com/pingcap/tidb/pull/2194)[session_variables and plugins of memory table to infoschema.

• Make the union all operator run parallelly.

• Support explaining the union statement.

Fixed

• A bug that causes infinite loop.

• A bug in the on duplicate… statement when updating the primary key (PK)

• Make the charset name case-insensitive.

• Forbid dropping columns with the auto_inc and PK attribute.

• Fix bugs in the parser.

Improved

• Pass the filter to TiKV when scanning indexes.

• Allocate column/index IDs in the table space to make the IDs shorter.

Weekly update in TiKV

Last week, we landed 34 PRs in the TiKV repositories.

Added

• Support online backup of the RocksDB data for tikv-ctl debugging.

• Add replication constraints to schedule replicas.

• Support GrantLeaderScheduler to transfer all leaders to one store.

• Support ShuffleLeaderScheduler to shuffle leaders in different stores.

• Support Circle CI for TiKV and Placement Driver (PD).

• Add the state filter argument to get the stores API.

Fixed

• Use channel to fix the possible stale snapshot state, issue #1373.

• Report ServerIsBusy and let PD ignore the busy store when scheduling to fix #414.

Improved

• Speed up the shutdown duration to reduce the close waiting time.

• Add retry when initializing the cluster ID.

• Support safe ConfChange to fix #1366.

• Report pending peers to PD to improve its scheduler.

• Bind ports lazily to avoid the message channel full error when starting up.