releases: add 5.0.3 release notes #5874
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| title: TiDB 5.0.3 Release Notes | ||
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| # TiDB 5.0.3 Release Notes | ||
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| Release date: July 2, 2021 | ||
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| TiDB version: 5.0.3 | ||
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| ## Compatibility Changes | ||
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| + TiDB | ||
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| - After a v4.0 cluster is upgraded to v5.0 or a later version (dev or v5.1), the default value of the `tidb_multi_statement_mode` variable changes from `WARN` to `OFF` | ||
| - TiDB is now compatible with MySQL 5.7's noop variable `innodb_default_row_format`. Setting this variable will have no effect. [#23541](https://github.com/pingcap/tidb/issues/23541) | ||
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| ## Feature Enhancements | ||
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| + Tools | ||
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| + TiCDC | ||
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| - Add an HTTP API to get the changefeed information and the health information of the node [#1955](https://github.com/pingcap/ticdc/pull/1955) | ||
| - Add the SASL/SCRAM support for the kafka sink [#1942](https://github.com/pingcap/ticdc/pull/1942) | ||
| - Make TiCDC support `--data-dir` at the server level [#2070](https://github.com/pingcap/ticdc/pull/2070) | ||
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TomShawn marked this conversation as resolved.
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| ## Improvements | ||
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| + TiDB | ||
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| - Support pushing down the `TopN` operator to TiFlash [#25162](https://github.com/pingcap/tidb/pull/25162) | ||
| - Support pushing down the built-in function `json_unquote()` to TiKV [#24415](https://github.com/pingcap/tidb/issues/24415) | ||
| - Support removing the union branch from the dual table [#25614](https://github.com/pingcap/tidb/pull/25614) | ||
| - Support pushing down the built-in function `replace()` to TiFlash [#25565](https://github.com/pingcap/tidb/pull/25565) | ||
| - Support pushing down the built-in functions `unix_timestamp()`, `concat()`, `year()`, `day()`, `datediff()`, `datesub()`, and `concat_ws()` to TiFlash [#25564](https://github.com/pingcap/tidb/pull/25564) | ||
| - Optimize the aggregate operator's cost factor [#25241](https://github.com/pingcap/tidb/pull/25241) | ||
| - Support pushing down the `Limit` operator to TiFlash [#25159](https://github.com/pingcap/tidb/pull/25159) | ||
| - Support pushing down the built-in function `str_to_date` to TiFlash [#25148](https://github.com/pingcap/tidb/pull/25148) | ||
| - Allow the MPP outer join to choose the build table based on the table row count [#25142](https://github.com/pingcap/tidb/pull/25142) | ||
| - Support pushing down the built-in functions `left()`, `right()`, and `abs()` to TiFlash [#25133](https://github.com/pingcap/tidb/pull/25133) | ||
| - Support pushing down the Broadcast Cartesian join to TiFlash [#25106](https://github.com/pingcap/tidb/pull/25106) | ||
| - Support pushing down the `Union All` operator to TiFlash [#25051](https://github.com/pingcap/tidb/pull/25051) | ||
| - Support balancing the MPP query workload among different TiFlash nodes based on Regions [#24724](https://github.com/pingcap/tidb/pull/24724) | ||
| - Support invalidating stale Regions in the cache after the MPP query is executed [#24432](https://github.com/pingcap/tidb/pull/24432) | ||
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TomShawn marked this conversation as resolved.
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| - Improve the MySQL compatibility of the built-in function `str_to_date` for the format specifiers `%b/%M/%r/%T` [#25767](https://github.com/pingcap/tidb/pull/25767) | ||
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| + TiKV | ||
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| - Limit the TiCDC sink's memory consumption [#10305](https://github.com/tikv/tikv/pull/10305) | ||
| - Add the memory-bounded upper limit for the TiCDC old value cache [#10313](https://github.com/tikv/tikv/pull/10313) | ||
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| + PD | ||
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| - Update TiDB Dashboard to v2021.06.15.1 [#3798](https://github.com/pingcap/pd/pull/3798) | ||
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TomShawn marked this conversation as resolved.
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| + TiFlash | ||
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| - Support casting the `STRING` type to the `DOUBLE` type | ||
| - Support the `STR_TO_DATE()` function | ||
| - Optimize the non-joined data in right outer join using multiple threads | ||
| - Support the Cartesian join | ||
| - Support the `LEFT()` and `RIGHT()` functions | ||
| - Support automatically invalidating stale Regions in MPP queries | ||
| - Support the `ABS()` function | ||
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TomShawn marked this conversation as resolved.
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| + Tools | ||
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| + TiCDC | ||
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| - Refine gRPC's reconnection logic and increase the KV client's throughput [#1586](https://github.com/pingcap/ticdc/issues/1586) [#1501](https://github.com/pingcap/ticdc/issues/1501#issuecomment-820027078) [#1682](https://github.com/pingcap/ticdc/pull/1682) [#1393](https://github.com/pingcap/ticdc/issues/1393) [#1847](https://github.com/pingcap/ticdc/pull/1847) [#1905](https://github.com/pingcap/ticdc/issues/1905) [#1904](https://github.com/pingcap/ticdc/issues/1904) | ||
| - Make the sorter I/O errors more user-friendly | ||
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| ## Bug Fixes | ||
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| + TiDB | ||
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| - Fix the issue that an incorrect result is returned when using merge join on the `SET` type column [#25669](https://github.com/pingcap/tidb/issues/25669) | ||
| - Fix the data corruption issue in the `IN` expression's arguments [#25591](https://github.com/pingcap/tidb/issues/25591) | ||
| - Avoid the sessions of GC being affected by global variables [#24976](https://github.com/pingcap/tidb/issues/24976) | ||
| - Fix the panic issue that occurs when using `limit` in the window function queries [#25344](https://github.com/pingcap/tidb/issues/25344) | ||
| - Fix the wrong value returned when querying a partitioned table using `Limit` [#24636](https://github.com/pingcap/tidb/issues/24636) | ||
| - Fix the issue that `IFNULL` does not correctly take effect on the `ENUM` or `SET` type column [#24944](https://github.com/pingcap/tidb/issues/24944) | ||
| - Fix the wrong results caused by changing the `count` in the join subqueries to `first_row` [#24865](https://github.com/pingcap/tidb/issues/24865) | ||
| - Fix the query hang issue that occurs when `ParallelApply` is used under the `TopN` operator [#24930](https://github.com/pingcap/tidb/issues/24930) | ||
| - Fix the issue that more results than expected are returned when executing SQL statements using multi-column prefix indexes [#24356](https://github.com/pingcap/tidb/issues/24356) | ||
| - Fix the issue that the `<=>` operator cannot correctly take effect [#24477](https://github.com/pingcap/tidb/issues/24477) | ||
| - Fix the data race issue of the parallel `Apply` operator [#23280](https://github.com/pingcap/tidb/issues/23280) | ||
| - Fix the issue that the `index out of range` error is reported when sorting the IndexMerge results of the PartitionUnion operator [#23919](https://github.com/pingcap/tidb/issues/23919) | ||
| - Fix the issue that setting the `tidb_snapshot` variable to an unexpectedly large value might damage the transaction isolation [#25680](https://github.com/pingcap/tidb/issues/25680) | ||
| - Fix the issue that the ODBC-styled constant (for example, `{d '2020-01-01'}`) cannot be used as the expression [#25531](https://github.com/pingcap/tidb/issues/25531) | ||
| - Fix the issue that `SELECT DISTINCT` converted to `Batch Get` causes incorrect results [#25320](https://github.com/pingcap/tidb/issues/25320) | ||
| - Fix the issue that backing off queries from TiFlash to TiKV cannot be triggered [#23665](https://github.com/pingcap/tidb/issues/23665) [#24421](https://github.com/pingcap/tidb/issues/24421) | ||
| - Fix the `index-out-of-range` error that occurs when checking `only_full_group_by` [#23839](https://github.com/pingcap/tidb/issues/23839)) | ||
| - Fix the issue that the result of index join in correlated subqueries is wrong [#25799](https://github.com/pingcap/tidb/issues/25799) | ||
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| + TiKV | ||
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| - Fix the wrong `tikv_raftstore_hibernated_peer_state` metric [#10330](https://github.com/tikv/tikv/issues/10330) | ||
| - Fix the wrong arguments type of the `json_unquote()` function in the coprocessor [#10176](https://github.com/tikv/tikv/issues/10176) | ||
| - Skip clearing callback during graceful shutdown to avoid breaking ACID in some cases [#10353](https://github.com/tikv/tikv/issues/10353) [#10307](https://github.com/tikv/tikv/issues/10307) | ||
| - Fix a bug that the read index is shared for replica reads on a Leader [#10347](https://github.com/tikv/tikv/issues/10347) | ||
| - Fix the wrong function that casts `DOUBLE` to `DOUBLE` [#25200](https://github.com/pingcap/tidb/issues/25200) | ||
| + PD | ||
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| - Fix the data race issue that occurs when loading TTL configurations after the scheduler is started [#3771](https://github.com/tikv/pd/issues/3771) | ||
| - Fix a bug that the `is_learner` field of the `TIKV_REGION_PEERS` table in TiDB is incorrect [#3372](https://github.com/tikv/pd/issues/3372) [#24293](https://github.com/pingcap/tidb/issues/24293) | ||
| - Fix the issue that when all TiKV nodes in a zone are offline or down, PD does not schedule replicas to other zones [#3705](https://github.com/tikv/pd/issues/3705) | ||
| - Fix the issue that PD might get panic after the scatter Region scheduler is added [#3762](https://github.com/tikv/pd/pull/3762) | ||
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TomShawn marked this conversation as resolved.
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| + TiFlash | ||
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| - Fix the issue that TiFlash keeps restarting because of the split failure | ||
| - Fix the potential issue that TiFlash cannot delete the delta data | ||
| - Fix a bug that TiFlash adds wrong padding for non-binary characters in the `CAST` function | ||
| - Fix the issue of incorrect results when handling aggregation queries with complex `GROUP BY` columns | ||
| - Fix the TiFlash panic issue that occurs under heavy write pressure | ||
| - Fix the panic that occurs when the right jon key is not nullalbe and the left join key is nullable | ||
| - Fix the potential issue that the `read-index` requests take a long time | ||
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TomShawn marked this conversation as resolved.
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| - Fix the panic issue that occurs when the read load is heavy | ||
| - Fix the panic issue that might occur when the `Date_Format` function is called with the `STRING` type argument and `NULL` values | ||
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| + Tools | ||
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| + TiCDC | ||
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| - Fix the issue that TiCDC owner exits when refreshing the checkpoint [#1902](https://github.com/pingcap/ticdc/issues/1902) | ||
| - Fix a bug that some MySQL connection might leak after MySQL sink meets the error and pauses [#1946](https://github.com/pingcap/ticdc/pull/1946) | ||
| - Fix the panic issue that occurs when TiCDC fails to read `/proc/meminfo` [#2024](https://github.com/pingcap/ticdc/pull/2024) | ||
| - Reduce TiCDC's runtime memory consumption [#2012](https://github.com/pingcap/ticdc/pull/2012) [#1958](https://github.com/pingcap/ticdc/pull/1958) | ||
| - Fix a bug that might cause TiCDC server panic due to the late calculation of resolved ts [#1576](https://github.com/pingcap/ticdc/issues/1576) | ||
| - Fix the potential deadlock issue for the processor [#2142](https://github.com/pingcap/ticdc/pull/2142) | ||
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| + Backup & Restore (BR) | ||
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| - Fix a bug that all system tables are filtered during restore [#1197](https://github.com/pingcap/br/issues/1197) [#1201](https://github.com/pingcap/br/issues/1201) | ||
| - Fix the issue that Backup & Restore reports the error of "file already exists" when TDE is enabled during the restore [#1179](https://github.com/pingcap/br/issues/1179) | ||
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| + TiDB Lightning | ||
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| - Fix the TiDB Lightning panic issue for some special data [#1213](https://github.com/pingcap/br/issues/1213) | ||
| - Fix the EOF error reported when TiDB Lightning splits the imported large CSV files [#1133](https://github.com/pingcap/br/issues/1133) | ||
| - Fix a bug that an excessively large base value is generated when TiDB Lightning imports tables with the `auto_increment` column of the `FLOAT` or `DOUBLE` type [#1186](https://github.com/pingcap/br/pull/1186) | ||
| - Fix the issue that TiDB fails to parse the `DECIMAL` type data in Parquet files [#1277](https://github.com/pingcap/br/pull/1277) | ||
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