TiDB Weekly

News & blog post

Last week, we published a post that introduces in detail how TiKV handles read and write operations. The post also explores how TiKV, as a distributed database, stores the data contained in a write request and how it retrieves the corresponding data with consistency guaranteed.

The full post is here:

How TiKV Reads and Writes

Community

New contributors

tidb:

• SeaRise
• ffutop
• githubFZX

tikv:

• yeya24

docs:

• kana112233

docs-cn:

• n0vad3v

Call for participation

• Issues to solve for TiDB
• Issues to solve for TiKV

Updates of the week

Progress

Last week, we landed 31 PRs in the TiDB repository, 8 PRs in the TiSpark repository, and 54 PRs in the TiKV and PD repositories.

Critical PRs

TiDB:

• Add the transformation rule TransformLimitToTableDual in the cascades planner
• Support stream when reading the cluster memory table
• Fill data in information.tidb_hot_table for partitioned tables
• Support PointGetPlan on the hash partitioned table
• Implement the restore function for KindMysqlDuration and KindMysqlTime

TiSpark:

• Support partition pruning on range columns partition

TiKV and PD:

• Reserve the disk space before creating the database engine
• Improve the store-load-based scheduler
• Speed up the configuration change
• Add the vectorized random_bytes
• Support changing the GC worker configuration online
• Support changing the RocksDB configuration online
• Fix the error handling of the RocksDB iterator
• Fix get_valid_int_prefix in the SELECT statement context
• Fix the issue that the result is inconsistent with TiDB when converting STRING to REAL using the CAST function
• Retry requests of the pending read index on followers
• Handle configuration changes with Snapshot correctly
• Fix the issue that the log_2args RPN function is inconsistent with TiDB
• Fix the issue that a string is parsed to the yymmddhhmm time format
• Fix the issue that the 00:00:00 string is parsed to 2000-00-00 00:00:00
• Fix the issue that the integer is converted to the duration
• Fix the issue that the RealPlus overflow is inconsistent with TiDB