TiDB 3.0.10 Release Notes

Release date: February 20, 2020

TiDB version: 3.0.10

TiDB Ansible version: 3.0.10

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.

TiDB

• Fix wrong Join results when IndexLookUpJoin uses OtherCondition to construct InnerRange #14599
• Delete the tidb_pprof_sql_cpu configuration item and add the tidb_pprof_sql_cpu variable #14416
• Fix the issue that users can query all databases only when they have global privileges #14386
• Fix the issue that data visibility does not meet expectations due to transaction timeout when executing PointGet operations #14480
• Change the timing of pessimistic transaction activation to delayed activation, consistent with the optimistic transaction mode #14474
• Fix the incorrect time zone results when the unixtimestamp expression calculates the time zone of the table partitions #14476
• Add the tidb_session_statement_deadlock_detect_duration_seconds monitoring item to monitor deadlock detection duration #14484
• Fix the system panic issue caused by some logic errors of GC workers #14439
• Correct the expression name of the IsTrue function #14516
• Fix the issue that some memory usage is counted inaccurately #14533
• Fix the system panic issue caused by incorrect processing logic during CM-Sketch statistics initialization #14470
• Fix the issue of inaccurate partition pruning when querying partitioned tables #14546
• Fix the issue that the default database name of the SQL statement in SQL bindings is set incorrectly #14548
• Fix the issue that json_key is not compatible with MySQL #14561
• Add the feature of automatically updating the statistics of partitioned tables #14566
• Fix the issue that the plan ID changes when the PointGet operation is executed (the plan ID is expected to be 1 always) #14595
• Fix the system panic issue caused by incorrect processing logic when SQL bindings do not match exactly #14263
• Add the tidb_session_statement_pessimistic_retry_count monitoring item to monitor the number of retries after the failure to lock pessimistic transactions #14619
• Fix the incorrect privilege check for show binding statements #14618
• Fix the issue that the query cannot be killed because the backoff logic does not include checking the killed tag #14614
• Improve the performance of statement summary by reducing the time to hold internal locks #14627
• Fix the issue that TiDB's result of parsing strings to time is incompatible with MySQL #14570
• Record the user login failures in audit logs #14620
• Add the tidb_session_ statement_lock_keys_count monitoring item to monitor the number of lock keys for pessimistic transactions #14634
• Fix the issue that characters in JSON such as &, <, and > are incorrectly escaped #14637
• Fix the system panic issue caused by excessive memory usage when the HashJoin operation is building a hash table #14642
• Fix the panic issue caused by incorrect processing logic when an SQL binding processes illegal records #14645
• ix a MySQL incompatibility issue by adding Truncated error detection to decimal division calculation #14673
• Fix the issue of successfully granting users privileges on a table that does not exist #14611

TiKV

• Raftstore
  • Fix the system panic issue #6460 or data loss issue #598 caused by Region merge failure #6481
  • Support yield to optimize scheduling fairness, and support pre-transfering the leader to improve leader scheduling stability #6563

PD

• Fix the invalid cache issue by supporting automatically updating the Region cache information when the system traffic changes #2103
• Use leader lease time to determine TSO service validity #2117

Tools

• TiDB Binlog
  • Support relay log in Drainer #893
• TiDB Lightning
  • Make some configuration items use default values when a config file is missing #255
  • Fix the issue that the web interface cannot be opened in the non-server mode #259

TiDB Ansible

• Fix the issue that the command execution fails due to the failure to obtain PD leader in some scenarios #1121
• Add the Deadlock Detect Duration monitoring item in the TiDB dashboard #1127
• Add the Statement Lock Keys Count monitoring item in the TiDB dashboard #1132
• Add the Statement Pessimistic Retry Count monitoring item in the TiDB dashboard #1133