Weekly update in TiDB

Last week, we landed 35 PRs in the TiDB repository.

Added

• Add a design document for TiDB cluster's system timezone
• Support resigning the DDL owner and use the ddl/owner/resign HTTP method
• Write system timezone into the MYSQL.TIDB table in the bootstrap stage
• Add two built-in functions decode and encode
• Add a proposal document for a Volcano/Cascades model based SQL planner

Improved

• Make the decimal default precision visible in SHOW CREATE TABLE
• Use the pumps client to write binlog files
• Improve the error message of GC life time
• Fill the data length fields for INFORMATION_SCHEMA.TABLES
• Support more built-in JSON functions
• Refactor the INFORMATION_SCHEMA.CHARSETS and INFORMATION_SCHEMA.COLLATIONS tables
• Register the metrics when TiDB starts up
• Store topN slow queries in the domain package
• Split property related code into a single package
• Reduce the interval for checking create table/schema
• Merge multiple EQ or In expressions if possible when calculating the range
• Use UnsafeDestroyRange instead of DeleteRange in GC
• Make updateRecord easier to understand
• Update the way of using the index feedback
• Move the error library from juju/errors to pkg/errors

Fixed

• Fix a bug in INSERT ... ON DUPLICATE KEY UPDATE
• Consider the timezone when calculating the default value for datetime
• Fix parsing datetime from string
• Use the inferred type as the column type in the schema
• Fix the default NUMBER_SCALE value of the float type in INFORMATION_SCHEMA.COLUMNS

Weekly update in TiSpark

Last week, we landed 1 PR in the TiSpark repository.

Fixed

• Resolve the conflicting jackson version introduced by typesafe.play

Weekly update in TiKV and PD

Last week, we landed 28 PRs in the TiKV and PD repositories.

Added

• Add new built-in functions builtin-log2 and builtin-log10
• Scale a TiKV cluster
• Implement DestroyRange
• Add a thread pool scheduler

Fixed

• Fix the panic issue about the hot store command
• Suppress the growth of EntryCache when a TiKV peer is down
• Update the follower size and keys after a commit is merged
• Broadcast the commit for urgent requests
• Flush logs before exiting
• Remove ReadDelegate lazily when a peer is destroyed asynchronously
• Fix a check about messages from the merged Region

Improved

• Make the TSO time decoding in pd-ctl more accurate
• Reduce the scheduler messages
• Use asynchronous snapshots in scheduler
• Split the txn process module
• Remove Generic from DAGContext
• Introduce Deadline and a new ReqContext

New contributors (Thanks!)

• tidb: kuafou
• tikv: sllt
• docs-cn: ethercflow