TiDB 2.1.2 Release Notes

On December 22, 2018, TiDB 2.1.2 is released. The corresponding TiDB-Ansible 2.1.2 is also released. Compared with TiDB 2.1.1, this release has great improvement in system compatibility and stability.

TiDB

• Make TiDB compatible with TiDB-Binlog of the Kafka version #8747
• Improve the exit mechanism of TiDB in a rolling update #8707
• Fix the panic issue caused by adding the index for the generated column in some cases #8676
• Fix the issue that the optimizer cannot find the optimal query plan when TIDB_SMJ Hint exists in the SQL statement in some cases #8729
• Fix the issue that AntiSemiJoin returns an incorrect result in some cases #8730
• Improve the valid character check of the utf8 character set #8754
• Fix the issue that the field of the time type might return an incorrect result when the write operation is performed before the read operation in a transaction #8746

PD

• Fix the Region information update issue about Region merge #1377

TiKV

• Support the configuration format in the unit of DAY (d) and fix the configuration compatibility issue #3931
• Fix the possible panic issue caused by Approximate Size Split #3942
• Fix two issues about Region merge #3822, #3873

Tools

• TiDB Lightning
  • Make TiDB 2.1.0 the minimum cluster version supported by Lightning
  • Fix the content error of the file involving parsed JSON data in Lightning #144
  • Fix the issue that Too many open engines occurs after the checkpoint is used to restart Lightning
• TiDB-Binlog
  • Eliminate some bottlenecks of Drainer writing data to Kafka
  • Support the Kafka version of TiDB-Binlog