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releases, toc: add 3.1.0 GA release notes (pingcap#2296) (pingcap#2306)
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| Original file line number | Diff line number | Diff line change |
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| --- | ||
| title: TiDB 3.1.0 GA Release Notes | ||
| category: Releases | ||
| --- | ||
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| # TiDB 3.1.0 GA Release Notes | ||
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| Release date: April 16, 2020 | ||
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| TiDB version: 3.1.0 GA | ||
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| TiDB Ansible version: 3.1.0 GA | ||
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| ## Compatibility Changes | ||
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| + TiDB | ||
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| - Support directly stopping starting TiDB if the HTTP listening port is unavailable when the `report-status` configuration item is enabled [#16291](https://github.com/pingcap/tidb/pull/16291) | ||
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| + Tools | ||
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| - Backup & Restore (BR) | ||
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| * BR does not support restoring data from the TiKV cluster earlier than 3.1 GA [#233](https://github.com/pingcap/br/pull/233) | ||
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| ## New Features | ||
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| + TiDB | ||
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| - Support displaying the information of Coprocessor tasks in `explain format = "dot"` [#16125](https://github.com/pingcap/tidb/pull/16125) | ||
| - Reduce the redundant stack information of log using the `disable-error-stack` configuration item [#16182](https://github.com/pingcap/tidb/pull/16182) | ||
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| + Placement Driver (PD) | ||
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| - Optimize the hot Region scheduling [#2342](https://github.com/pingcap/pd/pull/2342) | ||
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| + TiFlash | ||
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| - Add the metrics report related to the read and write workloads of DeltaTree engine | ||
| - Support pushing down the `fromUnixTime` and `dateFormat` functions | ||
| - Disable the rough set filter by default | ||
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| + TiDB Ansible | ||
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| - Add TiFlash monitor [#1253](https://github.com/pingcap/tidb-ansible/pull/1253) [#1257](https://github.com/pingcap/tidb-ansible/pull/1257) | ||
| - Optimize the configuration parameters of TiFlash [#1262](https://github.com/pingcap/tidb-ansible/pull/1262) [#1265](https://github.com/pingcap/tidb-ansible/pull/1265) [#1271](https://github.com/pingcap/tidb-ansible/pull/1271) | ||
| - Optimize the TiDB starting script [#1268](https://github.com/pingcap/tidb-ansible/pull/1268) | ||
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| ## Bug Fixes | ||
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| + TiDB | ||
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| - Fix the panic issue caused by the merge join operation in some scenarios [#15920](https://github.com/pingcap/tidb/pull/15920) | ||
| - Fix the issue that some expressions are repeatedly counted in selectivity calculation [#16052](https://github.com/pingcap/tidb/pull/16052) | ||
| - Fix the panic issue occurred when loading the statistics information in extreme cases [#15710](https://github.com/pingcap/tidb/pull/15710) | ||
| - Fix the issue that an error is returned in some cases when equivalent expressions cannot be recognized in SQL query [#16015](https://github.com/pingcap/tidb/pull/16015) | ||
| - Fix the issue that an error is returned when querying the `view` of one database from another database [#15867](https://github.com/pingcap/tidb/pull/15867) | ||
| - Fix the panic issue that occurs when the column is handled using `fast analyze` [#16080](https://github.com/pingcap/tidb/pull/16080) | ||
| - Fix the incorrect character set of the `current_role` print result [#16084](https://github.com/pingcap/tidb/pull/16084) | ||
| - Refine the log of MySQL connection handshake error [#15799](https://github.com/pingcap/tidb/pull/15799) | ||
| - Fix the panic issue caused by port probing after the audit plugin is loaded [#16065](https://github.com/pingcap/tidb/pull/16065) | ||
| - Fix the panic issue of the `sort` operator on left join because the `TypeNull` class is mistaken as a variable-length type [#15739](https://github.com/pingcap/tidb/pull/15739) | ||
| - Fix the issue of inaccurate count of monitoring session retry errors [#16120](https://github.com/pingcap/tidb/pull/16120) | ||
| - Fix the issue of wrong results of `weekday` in the `ALLOW_INVALID_DATES` mode [#16171](https://github.com/pingcap/tidb/pull/16171) | ||
| - Fix the issue that Garbage Collection (GC) might not work normally when the cluster has TiFlash nodes [#15761](https://github.com/pingcap/tidb/pull/15761) | ||
| - Fix the issue that TiDB goes out of memory (OOM) when users set a large partition count when creating the hash partitioned table [#16219](https://github.com/pingcap/tidb/pull/16219) | ||
| - Fix the issue that warnings are mistaken as errors, and make the `UNION` statement have the same behavior as the `SELECT` statement [#16138](https://github.com/pingcap/tidb/pull/16138) | ||
| - Fix the execution error when `TopN` is pushed down to mocktikv [#16200](https://github.com/pingcap/tidb/pull/16200) | ||
| - Increase the initial length of `chunk.column.nullBitMap` to avoid unnecessary overhead of `runtime.growslice` [#16142](https://github.com/pingcap/tidb/pull/16142) | ||
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| + TiKV | ||
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| - Fix the panic issue caused by replica read [#7418](https://github.com/tikv/tikv/pull/7418) [#7369](https://github.com/tikv/tikv/pull/7369) | ||
| - Fix the issue that the restoration process creates empty Regions [#7419](https://github.com/tikv/tikv/pull/7419) | ||
| - Fix the issue that repeated resolve lock requests might harm the atomicity of pessimistic transactions [#7389](https://github.com/tikv/tikv/pull/7389) | ||
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| + TiFlash | ||
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| - Fix the potential issue of the `rename table` operation when replicating the schema from TiDB | ||
| - Fix the issue of data loss caused by the `rename table` operation under multiple data path configurations | ||
| - Fix the issue that TiFlash reports incorrect storage space in some scenarios | ||
| - Fix the potential issue caused by reading from TiFlash when Region Merge is enabled | ||
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| + Tools | ||
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| - TiDB Binlog | ||
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| * Fix the issue that TiFlash-related DDL jobs might interrupt the replication of Drainer [#948](https://github.com/pingcap/tidb-binlog/pull/948) [#942](https://github.com/pingcap/tidb-binlog/pull/942) | ||
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| - BR | ||
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| * Fix the issue that the `checksum` operation is still executed when it is disabled [#223](https://github.com/pingcap/br/pull/223) | ||
| * Fix the issue that incremental backup fails when TiDB enables `auto-random` or `alter-pk` [#230](https://github.com/pingcap/br/pull/230) [#231](https://github.com/pingcap/br/pull/231) |
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