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release-3.0.10.md

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TiDB 3.0.10 Release Notes
/docs/dev/releases/release-3.0.10/
/docs/dev/releases/3.0.10/
TiDB 3.0.10 was released on February 20, 2020. It includes various bug fixes and improvements for TiDB, TiKV, PD, and TiDB Ansible. Some notable fixes include wrong Join results, data visibility issues, and system panic problems. TiDB Ansible also added new monitoring items to the dashboard. The release notes recommend using the latest 3.0.x version due to known issues in this release.

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 invalid 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-transferring 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