2018-02-12-tidb-weekly.md

title	date	summary	tags
Weekly update (February 05 ~ February 11, 2018)	2018-02-12	Last week, we landed 67 PRs in the TiDB repositories, 6 PRs in the TiSpark repositories, and 19 PRs in the TiKV and PD repositories.	TiDB TiKV PD TiSpark

Weekly update in TiDB

Last week, we landed 67 PRs in the TiDB repositories.

Added

• CreateIndex supports the LOCK option.
• Add GoVersion info for tidb_version
• Add a session variable to show the configuration
• Support show stats_healthy to check if a table needs to be analyzed

Removed

• Remove the useless field in jsonColumn
• Clean up the abandoned storage engine

Fixed

• Check the CreateTable statement charset option
• Fix the bug of show index printing non-public index when add index operation is not finished
• Treat a decimal truncate as a warning in update

Improved

• Run GC workers parallelly
• Pass the operator label from Plan to Executor
• Prepare the candidate index to improve performance
• Use pseudo estimation when the stats of some table is outdated
• Ignore the error and keep GC always working
• Set a min count for AutoAnalyze to avoid the auto analysis of small tables
• Improve importer tools:
  • Support randDate by statistics
  • Support generating other types of columns randomly by statistics
  • Generate a string by statistics
  • Support VARCHAR in set
  • Generate the integer data by Histogram
• Refine metrics in TiDB:
  • Rename _count to _num
  • Unify metrics naming
  • Add a metric for pseudo estimation
  • Make metrics content clearer and compacter
  • Move domain metrics and add the privilege load counter
  • Add metrics for DDL and the server
  • Add metrics for the DDL worker
  • Add metrics for expensive executors and statement nodes
  • Add metrics for stats
  • Fix inconsistent labels for the panic counter
  • Move DDL metrics from the ddl package to the metrics package
  • Refine TiKV client metrics
  • Add metrics for the DDL owner
  • Add metrics and logs for ticlient

Weekly update in TiSpark

Last week, we landed 6 PRs in the TiSpark repositories.

Improved

• Change the remote repository for the test data
• Add JDBC write guide usage

Fixed

• Fix key range corner cases
• Fix the bug of group by without aggregates
• Fix the resetFilters method
• Fix the character decoding charset

Weekly update in TiKV and PD

Last week, we landed 19 PRs in the TiKV and PD repositories.

Added

• Add the read pool
• Introduce the label property and the label scheduler
• Support configuring the label scheduler and the label property

Fixed

• Fix the bug caused by limit=0 or by no limit

Improved

• Add the file name and the line number for the box error
• Record the leader missing information
• Filter Store when counting the average leader and score
• Add stale_command in ASYNC_REQUESTS_COUNTER_VEC
• Check whether range.start < range.end
• Change the unit of heartbeat from ts to ms
• Limit the maximum total size of snapshot
• Collect gRPC logs
• Save the critical metadata in metrics
• Use local metrics
• Adjust the status of the store

New contributor (Thanks!)

• TiDB: caojiafeng