2017-06-12-tidb-weekly.md

title	date	summary	tags
Weekly update (June 06 ~ June 11, 2017)	2017-06-12	Last week, we landed 52 PRs in the TiDB repositories and 25 PRs in the TiKV repositories.	TiDB TiKV

Weekly update in TiDB

Last week, we landed 52 PRs in the TiDB repositories.

Added

• Refactor the optimizer:

  • Add an statsProfile interface to propagate statistic information among plans.
  • Implement the statsProfile interface for the Join plan.

• JSON type:

  • Suport json_set, json_insert, json_replace and json_merge.
  • Support the JSON type in the cast expression.

• Use gRPC between TiDB and TiKV.

• Refactor the Analyze executor.

• Add the SubDuration function in util package.

• Support the generated column grammar.

Fixed

• Create a session when the current session with etcd expires.

• Fix a bug about padding zeros for binary data.

• Fix a bug about type inference.

• Fix a but about data access race.

• Avoid allocating too much memory in the top-n operator.

• Add timeout when getting TimeStamp.

• Make the behavior of read-only transactions using the SelectForUpdate statement consistent with MySQL.

Improved

• Refactor expression evaluation:

  • Add builtinAddTimeSig
  • Correct cast function implementation.
  • Clean up code and prepare to add test cases.
  • Implement wrap expression with the cast expression.

• Speed up DDL process:

  • Extract interfaces for OwnerManger and SchemaSyncer. Add mock implementation for unit test.
  • Add TTL for DDL related keys on etcd.

• Code style clean up.

Weekly update in TiKV

Last week, We landed 25 PRs in the TiKV repositories.

Added

• Add the bloom filter for Lock CF meltable.
• Introduce gRPC, see 1892, 1894, 1896, 1903
• Use SST based bloom filter by default.
• Remove the bloom filter for Raft CF.
• Provide the GetTSAsync API.

Fixed

• Delete idle snapshot only on GC.
• Notify the blocked goroutines when get stream error.
• Fix a bug in get_txn_commit_info for concurrent prewrite.
• Check the leader again when fail to create TSO stream.
• Fix a data race problem in PD client.

Improved

• Optimize the Raft log entry fetching.
• Capture the SIGHUP and close gracefully.
• Avoid allocating lots of memory in topn function.
• Use SST snapshot format by default to speed up Raft snapshot applying.