TiDB 3.0.12 Release Notes

Release date: March 16, 2020

TiDB version: 3.0.12

TiDB Ansible version: 3.0.12

Warning

Some known issues are found in this version, and these issues are fixed in new versions. It is recommended that you use the latest 3.0.x version.

Compatibility Changes

TiDB
- Fix the issue of inaccurate timing of prewrite binlog in slow query log. The original timing field was called Binlog_prewrite_time. After this fix, the name is changed to Wait_prewrite_binlog_time. #15276

TiDB
- Support dynamic loading of the replaced certificate file by using the alter instance statement #15080 #15292
- Add the cluster-verify-cn configuration item. After configuration, the status service can only be used when with the corresponding CN certificate. #15164
- Add a flow limiting feature for DDL requests in each TiDB server to reduce the error reporting frequency of DDL request conflicts #15148
- Support exiting of the TiDB server when binlog write fails #15339
Tools
- TiDB Binlog
  - Add the kafka-client-id configuration item in Drainer, which supports connecting to Kafka clients to configure the client ID #929

TiDB
- Make GRANT, REVOKE guarantee atomicity when modifying multiple users #15092
- Fix the issue that the locking of pessimistic lock on the partition table failed to lock the correct row #15114
- Make the error message display according to the value of max-index-length in the configuration when the index length exceeds the limit #15130
- Fix the incorrect decimal point issue of the FROM_UNIXTIME function #15270
- Fix the issue of conflict detection failure or data index inconsistency caused by deleting records written by oneself in a transaction #15176
TiKV
- Fix the issue of conflict detection failure or data index inconsistency caused by inserting an existing key into a transaction and then deleting it immediately when disabling the consistency check parameter #7054
- Introduce a flow control mechanism in Raftstore to solve the problem that without flow control, it might lead to too slow tracking and cause the cluster to be stuck, and the transaction size might cause frequent reconnection of TiKV connections #7072 #6993
PD
- Fix the issue of incorrect Region information caused by data race when PD processes Region heartbeats #2233
TiDB Ansible
- Support deploying multiple Grafana/Prometheus/Alertmanager in a cluster #1198