Weekly update in TiDB

Last week, we landed 44 PRs in the TiDB repositories and 3 PRs in the TiDB docs repositories.

Added

• Support creating anonymous index.

• Add the mailing list for TiDB users.

• Support the show events syntax.

Fixed

• Enlarge the Time To Live (TTL) for large transactions.

• Parse float literal using the decimal parser.

• Prevent panic for malformed packets.

• Fix the behavior in the aggregate operator: for the select a, c from t groupby t.b statement, a and c should use the first row in the group.

• Add sequence number in binlog to preserve the original mutation order.

• Reset the current database after dropping the current database.

Improved

• Prevent loading schema by multiple threads.

• Make unit test run faster.

• Make explain result clearer.

• Remove driver.go from the TiDB project to enable users to use the MySQL official driver.

Document change

Add the following new guides:

• TiDB Cluster Troubleshooting Guide
• TiKV Tuning Guide

Weekly update in TiKV

Last week, we landed 20 PRs in the TiKV repositories.

Added

• Add and report the store labels to Placement Driver (PD).

• Add pending task metrics for Worker.

• Dump all the statistics about Column Family compaction and Database.

Fixed

• Use fs2 to get disk states to fix #1318

• Use the monotonic clock time to improve the safety of leader lease read, to fix #964.

• Check the format of the listening and advertise address to fix #1332.

• Get the first value no matter if it is Null in aggregation.

• Fix a Garbage Collection bug which deletes the latest deleted key before SafePoint.

• Stop attaching term to the MsgReadIndex message to fix #1240.

Improved

• Clean up the command flags and configurations parsing.

• Abstract a Selector to schedule region peer.

• Split the Raft Ready handle to two handles: Append and Apply.

• Use larger Heartbeat and Election timeout to reduce the network pressure.

• Ignore outdated tasks in Coprocessor to fix #1305.