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| Original file line number | Diff line number | Diff line change |
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| --- | ||
| title: TiDB 5.1.1 Release Notes | ||
| --- | ||
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| # TiDB 5.1.1 Release Notes | ||
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| Release Date: July 30, 2021 | ||
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| TiDB version: 5.1.1 | ||
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| ## Compatibility changes | ||
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| + TiDB | ||
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| - For TiDB clusters upgrade from v4.0 to v5.1, the default value of `tidb_multi_statement_mode` is `OFF`. It is recommended to use the multi-statement feature of your client library instead. See [the documentation on `tidb_multi_statement_mode`](/system-variables.md#tidb_multi_statement_mode-new-in-v4011) for details. [#25751](https://github.com/pingcap/tidb/pull/25751) | ||
| - Change the default value of the `tidb_stmt_summary_max_stmt_count` variable from `200` to `3000` [#25874](https://github.com/pingcap/tidb/pull/25874) | ||
| - Require the `SUPER` privilege to access the `table_storage_stats` table [#26352](https://github.com/pingcap/tidb/pull/26352) | ||
| - Require the `SELECT` privilege on `mysql.user` to access the `information_schema.user_privileges` table to show other user's privileges [#26311](https://github.com/pingcap/tidb/pull/26311) | ||
| - Require the `CONFIG` privilege to access the `information_schema.cluster_hardware` table [#26297](https://github.com/pingcap/tidb/pull/26297) | ||
| - Require the `PROCESS` privilege to access the `information_schema.cluster_info` table [#26297](https://github.com/pingcap/tidb/pull/26297) | ||
| - Require the `PROCESS` privilege to access the `information_schema.cluster_load` table [#26297](https://github.com/pingcap/tidb/pull/26297) | ||
| - Require the `PROCESS` privilege to access the `information_schema.cluster_systeminfo` table [#26297](https://github.com/pingcap/tidb/pull/26297) | ||
| - Require the `PROCESS` privilege to access the `information_schema.cluster_log` table [#26297](https://github.com/pingcap/tidb/pull/26297) | ||
| - Require the `CONFIG` privilege to access the `information_schema.cluster_config` table [#26150](https://github.com/pingcap/tidb/pull/26150) | ||
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| ## Feature enhancements | ||
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| + TiDB Dashboard | ||
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| - Support OIDC SSO. By setting the OIDC-compatible SSO services (such as Okta and Auth0), users can log into TiDB Dashboard without entering the SQL password. [#3883](https://github.com/tikv/pd/pull/3883) | ||
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| + TiFlash | ||
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| - Support the `HAVING()` function in DAG requests | ||
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| ## Improvements | ||
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| + TiDB | ||
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| - Announce the general availability (GA) of the Stale Read feature | ||
| - Avoid allocation for `paramMarker` to speed up data insertion [#26076](https://github.com/pingcap/tidb/pull/26076) | ||
| - Support the stable result mode to make the query results more stable [#25995](https://github.com/pingcap/tidb/pull/25995) | ||
| - Support pushing down the built-in function `json_unquote()` to TiKV [#26265](https://github.com/pingcap/tidb/pull/26265) | ||
| - Support retrying MPP queries [#26480](https://github.com/pingcap/tidb/pull/26480) | ||
| - Change the `LOCK` record into the `PUT` record for the index keys using `point get` or `batch point get` for `UPDATE` reads [#26225](https://github.com/pingcap/tidb/pull/26225) | ||
| - Forbid creating views from stale queries [#26200](https://github.com/pingcap/tidb/pull/26200) | ||
| - Thoroughly push down the `COUNT(DISTINCT)` aggregation function in the MPP mode [#26194](https://github.com/pingcap/tidb/pull/26194) | ||
| - Check the availability of TiFlash before launching MPP queries [#26192](https://github.com/pingcap/tidb/pull/26192) | ||
| - Do not allow setting the read timestamp to a future time [#25763](https://github.com/pingcap/tidb/pull/25763) | ||
| - Print log warnings when aggregation functions cannot be pushed down in `EXPLAIN` statements [#25737](https://github.com/pingcap/tidb/pull/25737) | ||
| - Add the `statements_summary_evicted` table to record the evicted count information of a cluster [#25587](https://github.com/pingcap/tidb/pull/25587) | ||
| - Improve the MySQL compatibility of the built-in function `str_to_date` for the format specifiers `%b/%M/%r/%T` [#25768](https://github.com/pingcap/tidb/pull/25768) | ||
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| + TiKV | ||
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| - Make the prewrite requests as idempotent as possible to reduce the chance of undetermined errors [#10586](https://github.com/tikv/tikv/pull/10586) | ||
| - Prevent the risk of stack overflow when handling many expired commands [#10502](https://github.com/tikv/tikv/pull/10502) | ||
| - Avoid excessive commit request retrying by not using the Stale Read request's `start_ts` to update `max_ts` [#10451](https://github.com/tikv/tikv/pull/10451) | ||
| - Handle read ready and write ready separately to reduce read latency [#10592](https://github.com/tikv/tikv/pull/10592) | ||
| - Reduce the impact on data import speed when the I/O rate limiting is enabled [#10390](https://github.com/tikv/tikv/pull/10390) | ||
| - Improve the load balance between Raft gRPC connections [#10495](https://github.com/tikv/tikv/pull/10495) | ||
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| + Tools | ||
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| + TiCDC | ||
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| - Remove `file sorter` [#2327](https://github.com/pingcap/ticdc/pull/2327) | ||
| - Improve the error message returned when a PD endpoint misses the certificate [#1973](https://github.com/pingcap/ticdc/issues/1973) | ||
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| + TiDB Lightning | ||
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| - Add a retry mechanism for restoring schemas [#1294](https://github.com/pingcap/br/pull/1294) | ||
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| + Dumpling | ||
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| - Always split tables using `_tidb_rowid` when the upstream is a TiDB v3.x cluster, which helps reduce TiDB's memory usage [#295](https://github.com/pingcap/dumpling/issues/295) | ||
| - Reduce the frequency of accessing the database metadata to improve Dumpling's performance and stability [#315](https://github.com/pingcap/dumpling/pull/315) | ||
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| ## Bug fixes | ||
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| + TiDB | ||
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| - Fix the data loss issue that might occur when changing the column type with `tidb_enable_amend_pessimistic_txn=on` [#26203](https://github.com/pingcap/tidb/issues/26203) | ||
| - Fix the issue that the behavior of the `last_day` function is incompatible in the SQL mode [#26001](https://github.com/pingcap/tidb/pull/26001) | ||
| - Fix the panic issue that might occur when `LIMIT` is on top of window functions [#25344](https://github.com/pingcap/tidb/issues/25344) | ||
| - Fix the issue that committing pessimistic transactions might cause write conflict [#25964](https://github.com/pingcap/tidb/issues/25964) | ||
| - Fix the issue that the result of index join in correlated subqueries is wrong [#25799](https://github.com/pingcap/tidb/issues/25799) | ||
| - Fix a bug that the successfully committed optimistic transactions might report commit errors [#10468](https://github.com/tikv/tikv/issues/10468) | ||
| - 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 a bug that the index keys in a pessimistic transaction might be repeatedly committed [#26359](https://github.com/pingcap/tidb/issues/26359) | ||
| - Fix the risk of integer overflow when the optimizer is locating partitions [#26227](https://github.com/pingcap/tidb/issues/26227) | ||
| - Fix the issue that invalid values might be written when casting `DATE` to timestamp [#26292](https://github.com/pingcap/tidb/issues/26292) | ||
| - Fix the issue that the Coprocessor Cache metrics are not displayed on Grafana [#26338](https://github.com/pingcap/tidb/issues/26338) | ||
| - Fix the issue of annoying logs caused by telemetry [#25760](https://github.com/pingcap/tidb/issues/25760) [#25785](https://github.com/pingcap/tidb/issues/25785) | ||
| - Fix a bug on the query range of prefix index [#26029](https://github.com/pingcap/tidb/issues/26029) | ||
| - Fix the issue that concurrently truncating the same partition hangs DDL executions [#26229](https://github.com/pingcap/tidb/issues/26229) | ||
| - Fix the issue of duplicate `ENUM` items [#25955](https://github.com/pingcap/tidb/issues/25955) | ||
| - Fix a bug that the CTE iterator is not correctly closed [#26112](https://github.com/pingcap/tidb/issues/26112) | ||
| - Fix the issue that the `LOAD DATA` statement might abnormally import non-utf8 data [#25979](https://github.com/pingcap/tidb/issues/25979) | ||
| - Fix the panic issue that might occur when using the window function on the unsigned integer columns [#25956](https://github.com/pingcap/tidb/issues/25956) | ||
| - Fix the issue that TiDB might panic when resolving async commit locks [#25778](https://github.com/pingcap/tidb/issues/25778) | ||
| - Fix the issue that Stale Read is not fully compatible with the `PREPARE` statements [#25800](https://github.com/pingcap/tidb/pull/25800) | ||
| - 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 an error that occurs when running TiDB alone [#25555](https://github.com/pingcap/tidb/pull/25555) | ||
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| + TiKV | ||
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| - Fix the issue that the duration calculation might panic on certain platforms [#10569](https://github.com/tikv/tikv/pull/10569) | ||
| - Fix the issue that Load Base Split mistakenly uses the unencoded keys of `batch_get_command` [#10542](https://github.com/tikv/tikv/issues/10542) | ||
| - Fix the issue that changing the `resolved-ts.advance-ts-interval` configuration online cannot take effect immediately [#10426](https://github.com/tikv/tikv/issues/10426) | ||
| - Fix the issue of follower metadata corruption in rare cases with more than 4 replicas [#10225](https://github.com/tikv/tikv/issues/10225) | ||
| - Fix the panic issue that occurs when building a snapshot twice if encryption is enabled [#9786](https://github.com/tikv/tikv/issues/9786) [#10407](https://github.com/tikv/tikv/issues/10407) | ||
| - 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) | ||
| - Fix a bug that the index keys in a pessimistic transaction might be repeatedly committed [#10468](https://github.com/tikv/tikv/issues/10468#issuecomment-869491061) | ||
| - Fix the issue that the `ReadIndex` request returns stale result right after the leader is transferred [#9351](https://github.com/tikv/tikv/issues/9351) | ||
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| + PD | ||
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| - Fix the issue the expected scheduling cannot be generated when the conflict occurs due to multiple schedulers running at the same time [#3807](https://github.com/tikv/pd/issues/3807) [#3778](https://github.com/tikv/pd/issues/3778) | ||
| - Fix the issue that the scheduler might appear again even if the scheduler is already deleted [#2572](https://github.com/tikv/pd/issues/2572) | ||
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| + TiFlash | ||
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| - Fix the potential panic issue that occurs when running table scan tasks | ||
| - Fix a bug that TiFlash raises the error about `duplicated region` when handling DAQ requests | ||
| - Fix the panic issue that occurs when the read load is heavy | ||
| - Fix the potential panic issue that occurs when executing the `DateFormat` function | ||
| - Fix the potential memory leak issue that occurs when executing MPP tasks | ||
| - Fix the issue of unexpected results when executing the aggregation functions `COUNT` or `COUNT DISTINCT` | ||
| - Fix a potential bug that TiFlash cannot restore data when deployed on multiple disks | ||
| - Fix the issue that TiDB Dashboard cannot display the disk information of TiFlash correctly | ||
| - Fix the potential panic issue that occurs when deconstructing `SharedQueryBlockInputStream` | ||
| - Fix the potential panic issue that occurs when deconstructing `MPPTask` | ||
| - Fix the potential issue of data inconsistency after synchronizing data via snapshot | ||
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| + Tools | ||
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| + TiCDC | ||
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| - Fix the support for the new collation feature [#2301](https://github.com/pingcap/ticdc/issues/2301) | ||
| - Fix the issue that an unsynchronized access to a shared map at runtime might cause panic [#2300](https://github.com/pingcap/ticdc/pull/2300) | ||
| - Fix the potential DDL loss issue that occurs when the owner crashes while executing the DDL statement [#2290](https://github.com/pingcap/ticdc/pull/2290) | ||
| - Fix the issue of trying to resolve locks in TiDB prematurely [#2188](https://github.com/pingcap/ticdc/issues/2188) | ||
| - Fix a bug that might cause data loss if a TiCDC node is killed immediately after a table migration [#2033](https://github.com/pingcap/ticdc/pull/2033) | ||
| - Fix the handling logic of `changefeed update` on `--sort-dir` and `--start-ts` [#1921](https://github.com/pingcap/ticdc/pull/1921) | ||
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| + Backup & Restore (BR) | ||
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| - Fix the issue that the size of the data to restore is incorrectly calculated [#1270](https://github.com/pingcap/br/issues/1270) | ||
| - Fix the issue of missed DDL events that occurs when restoring from cdclog [#870](https://github.com/pingcap/br/issues/870) | ||
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| + TiDB Lightning | ||
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| - Fix the issue that TiDB fails to parse the `DECIMAL` type data in Parquet files [#1275](https://github.com/pingcap/br/pull/1275) | ||
| - Fix the issue of integer overflow when calculating key intervals [#1291](https://github.com/pingcap/br/issues/1291) [#1290](https://github.com/pingcap/br/issues/1290) |
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