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TiDB 2.0 RC5 Release Notes
/docs/dev/releases/release-2.0-rc.5/
/docs/dev/releases/2rc5/
TiDB 2.0 RC5 was released on April 17, 2018, with improvements in MySQL compatibility, SQL optimization, and stability. Fixes and optimizations were made to TiDB, PD, and TiKV components, including support for Raft Learner, reducing scheduling overhead, and adding new batch operations. The release also addressed issues related to memory usage, error reporting, and configuration adjustments.

TiDB 2.0 RC5 Release Notes

On April 17, 2018, TiDB 2.0 RC5 is released. This release has great improvement in MySQL compatibility, SQL optimization and stability.

TiDB

  • Fix the issue about applying the Top-N pushdown rule
  • Fix the estimation of the number of rows for the columns that contain NULL values
  • Fix the zero value of the Binary type
  • Fix the BatchGet issue within a transaction
  • Clean up the written data while rolling back the Add Index operation, to reduce consumed space
  • Optimize the insert on duplicate key update statement to improve the performance by 10 times
  • Fix the issue about the type of the results returned by the UNIX_TIMESTAMP function
  • Fix the issue that the NULL value is inserted while adding NOT NULL columns
  • Support showing memory usage of the executing statements in the Show Process List statement
  • Fix the issue that Alter Table Modify Column reports an error in extreme conditions
  • Support setting the table comment using the Alter statement

PD

  • Add support for Raft Learner
  • Optimize the Balance Region Scheduler to reduce scheduling overhead
  • Adjust the default value of schedule-limit configuration
  • Fix the issue of allocating ID frequently
  • Fix the compatibility issue when adding a new scheduler

TiKV

  • Support the Region specified by compact in tikv-ctl
  • Support Batch Put, Batch Get, Batch Delete and Batch Scan in the RawKVClient
  • Fix the OOM issue caused by too many snapshots
  • Return more detailed error information in Coprocessor
  • Support dynamically modifying the block-cache-size in TiKV through tikv-ctl
  • Further improve importer
  • Simplify the ImportSST::Upload interface
  • Configure the keepalive property of gRPC
  • Split tikv-importer from TiKV as an independent binary
  • Provide statistics about the number of rows scanned by each scan range in Coprocessor
  • Fix the compilation issue on the macOS system
  • Fix the issue of misusing a RocksDB metric
  • Support the overflow as warning option in Coprocessor