Weekly update (October 31 ~ November 06, 2016)

Last week, we landed 42 PRs in the TiDB repositories and 29 PRs in the TiKV repositories.

New release

TiDB Beta 4

Weekly update in TiDB

Added

• The aggregation info to the explain statement.

• Support the show processlist syntax. TiDB supports mydumper now.

• Support the show create database statement.

• Support the buildin function from_unixtime.

• Push down the aggregation operator to the position before join.

• Get cluster ID from Placement Driver.

Fixed

• A bug in parser that misses the recognize identifier with leading digits.

• A bug in the load data command.

Improved

• The performance of the DropTable statement.

• The performance of the AddIndex statement.

• The query metrics.

Weekly update in TiKV

Added

• Multiversion concurrency control (MVCC) support for tikv-ctl.
• Support -v/--version to print the version information.
• Metrics for MVCC key versions and deleted key versions.
• Use random cluster ID to bootstrap clusters to avoid wrong joining cluster by the users, with PR 370, 1257

Fixed

• Panic directly if the RocksDB writes fail to fix 1262.
• Add the start time for store monitor to fix 1207.
• Return the ‘no leader’ error to avoid panic when calling the GetLeader API with no leader.

Improved

• Skip values for scan.
• Make cache code cleaner, with PR 365, 366, 367.
• Allow liner reverse seek in the lock column family.
• Separate compaction to a different thread worker.
• Avoid filling block cache when scanning.
• Include the snapshot size in the used_size store.
• Dump the RocksDB statistics with the SIGUSR1 signal.