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  • Mon, Jun 5, 2017

Weekly update in TiDB

Last two weeks, we landed 53 PRs in the TiDB repositories.

Added

  • Support using After and First to specify column position in the Alter Table Statement.

  • Support the password builtin function.

  • Support the inet6_ntoa builtin function.

  • Support the Extract and Unquote function for Json.

  • Support json_{set/insert/replace} and json_merge for Json.

  • Support batched Index Lookup Join.

Fixed

  • Fix a goroutine leak problem.

  • Fix a bug in double read executor.

  • Fix a bug for type inferrer of Bit literal value.

  • Fix a bug about context cancellation.

Improved

  • Refactor expression evaluation:

    • Refactor the cast function.
    • Add the GetTypeClass() interface in Expression.

  • Update stored password in mysql.user table to make it consistent with MySQL.

  • Speed up the DDL process:

    • Use etcd to synchronise schema version instead of waiting two leases.
    • Enable DDL speed up.

  • Add the references_priv column in mysql.user.

  • Close DDL worker gracefully when shutting down the TiDB server.

Weekly update in TiKV

Last two weeks, We landed 33 PRs in the TiKV repositories.

Added

  • Introduce gRPC, see 1850, 1865, 1868, 1879.
  • Report the written keys to PD for better scheduler.
  • Balance the hot regions by peer and leader together.
  • Record the cluster bootstrap time.
  • Add the state for operators.
  • Add the metrics for balance.
  • Add the disaster recovery tool for PD.
  • Output the allocation statistics when receiving SIGUSR1.
  • Add the direct IO configuration for RocksDB.

Fixed

  • Check the cluster ID when re-connecting to PD.
  • Reuse the timer to avoid spawning thread frequently.
  • Remove the realtime signal handler.
  • Prevent accessing nil store when recovering cluster.
  • Check the environment TZ setting.
  • Use the forward mode for scanning data in GC command.
  • Check the last apply index to determine handing snapshot.

Improved

  • Increase the region size from 64 MB to 96 MB.
  • Split total region peer cache.
  • Use FlatMap instead of HashMap to improve performance.
  • Modify the default compression in RocksDB.

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