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| Original file line number | Diff line number | Diff line change |
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| --- | ||
| title: TiDB 4.0 RC Release Notes | ||
| category: Releases | ||
| --- | ||
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| # TiDB 4.0 RC Release Notes | ||
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| Release date: April 8, 2020 | ||
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| TiDB version: 4.0.0-rc | ||
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| TiUP version: 0.0.3 | ||
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| ## Compatibility Changes | ||
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| + TiDB | ||
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| - Refuse to get started instead of returning an alert log when the tidb-server status port is occupied [#15177](https://github.com/pingcap/tidb/pull/15177) | ||
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| + TiKV | ||
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| - Support the `pipelined` feature in pessimistic transactions, which improves the TPC-C performance by 20%. The risk is that the transaction commit might fail because of lock failure during the execution [#6984](https://github.com/tikv/tikv/pull/6984) | ||
| - Enable the `unify-read-pool` configuration item in new clusters by default and use the previous setting of this item in old clusters [#7059](https://github.com/tikv/tikv/pull/7059) | ||
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| + Tools | ||
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| - TiDB Binlog | ||
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| * Add the configuration item for verifying Common Name [#934](https://github.com/pingcap/tidb-binlog/pull/934) | ||
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| ## Important Bug Fixes | ||
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| + TiDB | ||
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| - Fix the issue that replication between the upstream and downstream might go wrong when the DDL job is executed using the `PREPARE` statement because of the incorrect job query in the internal records [#15435](https://github.com/pingcap/tidb/pull/15435) | ||
| - Fix the issue of incorrect subquery result in the `Read Commited` isolation level [#15471](https://github.com/pingcap/tidb/pull/15471) | ||
| - Fix the issue of incorrect results caused by the Inline Projection optimization [#15411](https://github.com/pingcap/tidb/pull/15411) | ||
| - Fix the issue that the SQL Hint `INL_MERGE_JOIN` is executed incorrectly in some cases [#15515](https://github.com/pingcap/tidb/pull/15515) | ||
| - Fix the issue that columns with the `AutoRandom` attribute are rebased when the negative number is explicitly written to these columns [#15397](https://github.com/pingcap/tidb/pull/15397) | ||
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| ## New Features | ||
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| + TiDB | ||
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| - Add the case-sensitive collation so that users can enable `utf8mb4_general_ci` and `utf8_general_ci` in a new cluster [#33](https://github.com/pingcap/tidb/projects/33) | ||
| - Enhance the `RECOVER TABLE` syntax to support recovering truncated tables [#15398](https://github.com/pingcap/tidb/pull/15398) | ||
| - Refuse to get started instead of returning an alert log when the the tidb-server status port is occupied [#15177](https://github.com/pingcap/tidb/pull/15177) | ||
| - Optimize the write performance of using a sequence as the default column values [#15216](https://github.com/pingcap/tidb/pull/15216) | ||
| - Add the `DDLJobs` system table to query the details of DDL jobs [#14837](https://github.com/pingcap/tidb/pull/14837) | ||
| - Optimize the `aggFuncSum` performance [#14887](https://github.com/pingcap/tidb/pull/14887) | ||
| - Optimize the output of `EXPLAIN` [#15507](https://github.com/pingcap/tidb/pull/15507) | ||
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| + TiKV | ||
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| - Support the `pipelined` feature in pessimistic transactions, which improves the TPC-C performance by 20%. The risk is that the transaction commit might fail because of lock failure during the execution [#6984](https://github.com/tikv/tikv/pull/6984) | ||
| - Support TLS in the HTTP port [#5393](https://github.com/tikv/tikv/pull/5393) | ||
| - Enable the `unify-read-pool` configuration item in new clusters by default and use the previous setting of this item in old clusters [#7059](https://github.com/tikv/tikv/pull/7059) | ||
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| + PD | ||
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| - Support getting the default PD configuration information through the HTTP API [#2258](https://github.com/pingcap/pd/pull/2258) | ||
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| + Tools | ||
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| - TiDB Binlog | ||
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| * Add the configuration item for verifying Common Name [#934](https://github.com/pingcap/tidb-binlog/pull/934) | ||
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| - TiDB Lightning | ||
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| * Optimize the performance of TiDB Lightning [#281](https://github.com/pingcap/tidb-lightning/pull/281) [#275](https://github.com/pingcap/tidb-lightning/pull/275) | ||
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| ## Bug Fixes | ||
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| + TiDB | ||
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| - Fix the issue that replication between the upstream and downstream might go wrong when the DDL job is executed using the `PREPARE` statement because of the incorrect job query in the internal records [#15435](https://github.com/pingcap/tidb/pull/15435) | ||
| - Fix the issue of incorrect subquery result in the `Read Commited` isolation level [#15471](https://github.com/pingcap/tidb/pull/15471) | ||
| - Fix the issue of possible wrong behavior when using `INSERT ... VALUES` to specify the `BIT(N)` data type [#15350](https://github.com/pingcap/tidb/pull/15350) | ||
| - Fix the issue that the DDL Job internal retry does not fully achieve the expected outcomes because the values of `ErrorCount` fail to be summed correctly [#15373](https://github.com/pingcap/tidb/pull/15373) | ||
| - Fix the issue that Garbage Collection might work abnormally when TiDB connects to TiFlash [#15505](https://github.com/pingcap/tidb/pull/15505) | ||
| - Fix the issue of incorrect result caused by the Inline Projection optimization [#15411](https://github.com/pingcap/tidb/pull/15411) | ||
| - Fix the issue that the SQL Hint `INL_MERGE_JOIN` is executed incorrectly in some cases [#15515](https://github.com/pingcap/tidb/pull/15515) | ||
| - Fix the issue that columns with the `AutoRandom` attribute are rebased when the negative number is explicitly written to these columns [#15397](https://github.com/pingcap/tidb/pull/15397) | ||
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| + TiKV | ||
| - Fix the possible panic caused by transferring the leader when the Follower Read feature is enabled [#7101](https://github.com/tikv/tikv/pull/7101) | ||
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| + Tools | ||
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| - TiDB Lightning | ||
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| * Fix the issue of data error caused by the error of character conversion when the backend is TiDB [#283](https://github.com/pingcap/tidb-lightning/pull/283) | ||
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| - TiCDC | ||
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| * Fix the issue that an error is returned if the `test` schema does not exist in the downstream when MySQL sink is executing the DDL statement [#353](https://github.com/pingcap/ticdc/pull/353) | ||
| * Support the real-time interactive mode in CDC cli [#351](https://github.com/pingcap/ticdc/pull/351) | ||
| * Support checking whether the table in the upstream can be replicated during data replication [#368](https://github.com/pingcap/ticdc/pull/368) | ||
| * Support asynchronous write to Kafka [#344](https://github.com/pingcap/ticdc/pull/344) |
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