releases: add TiDB 5.1.1 release notes

TOC.md

@@ -549,6 +549,7 @@
  + [All Releases](/releases/release-notes.md)
  + [TiDB Roadmap](/roadmap.md)
  + v5.1
+ + [5.1.1](/releases/release-5.1.1.md)
  + [5.1.0](/releases/release-5.1.0.md)
  + v5.0
  + [5.0.3](/releases/release-5.0.3.md)

releases/release-5.1.1.md

@@ -0,0 +1,164 @@
+---
+title: TiDB 5.1.1 Release Notes
+---
+
+# TiDB 5.1.1 Release Notes
+
+Release Date: July 30, 2021
+
+TiDB version: 5.1.1
+
+## Compatibility change
+
++ TiDB
+
+ - For users upgrading from TiDB 4.0, the value of tidb_multi_statement_mode is now OFF. It is recommended to use the multi-statement feature of your client library instead, see the documentation on tidb_multi_statement_mode for additional details. [#25751](https://github.com/pingcap/tidb/pull/25751)
+ - exec: access the table_storage_stats need super privilege [#26352](https://github.com/pingcap/tidb/pull/26352)
+ - Accessing information_schema.user_privileges will now requires the SELECT privilege on mysql.user in order to show other user's privileges. [#26311](https://github.com/pingcap/tidb/pull/26311)
+ - Reading from the table information_schema.cluster_hardware now requires the CONFIG privilege.
+ - Reading from the table information_schema.cluster_info now requires the Process privilege.
+ - Reading from the table information_schema.cluster_load now requires the Process privilege.
+ - Reading from the table information_schema.cluster_systeminfo now requires the Process privilege.
+ - Reading from the table information_schema.cluster_log now requires the Process privilege. [#26297](https://github.com/pingcap/tidb/pull/26297)
+ - Reading from the table information_schema.cluster_config now requires the CONFIG privilege. [#26150](https://github.com/pingcap/tidb/pull/26150)
+ - Improve the MySQL compatibility of str_to_date for %b/%M/%r/%T [#25768](https://github.com/pingcap/tidb/pull/25768)
+
+## Feature enhancements
+
++ TiDB Dashboard
+
+ - TiDB Dashboard: Add OIDC based SSO support [#3883](https://github.com/tikv/pd/pull/3883)
+
++ TiFlash
+
+ - Support the `HAVING()` function in DAG request
+
+## Improvements
+
++ TiDB
+
+ - Announce the general availability (GA) of the Stale Read feature
+ - avoid alloc for paramMarker in buildValuesListOfInsert [#26076](https://github.com/pingcap/tidb/pull/26076)
+ - planner: support stable result mode [#25995](https://github.com/pingcap/tidb/pull/25995)
+ - Enable the pushdown of builtin function json_unquote() to TiKV. [#26265](https://github.com/pingcap/tidb/pull/26265)
+ - store/copr: support retry for mpp query [#26480](https://github.com/pingcap/tidb/pull/26480)
+ - Change the lock record into put record for the index keys using point/batch point get for update read. [#26225](https://github.com/pingcap/tidb/pull/26225)
+ - Forbid creating view from stale query [#26200](https://github.com/pingcap/tidb/pull/26200)
+ - planner/core: thoroughly push down count-distinct agg in the MPP mode. [#26194](https://github.com/pingcap/tidb/pull/26194)
+ - mpp: check the tiflash availabilities before launching mpp queries. [#26192](https://github.com/pingcap/tidb/pull/26192)
+ - Enlarge the variable tidb_stmt_summary_max_stmt_count default value from 200 to 3000 [#25874](https://github.com/pingcap/tidb/pull/25874)
+ - Do not allow setting read timestamp to a future time. [#25763](https://github.com/pingcap/tidb/pull/25763)
+ - Log warnings when agg function can not be pushdown in explain statement [#25737](https://github.com/pingcap/tidb/pull/25737)
+ - Add cluster information of evicted count. [#25587](https://github.com/pingcap/tidb/pull/25587) - Enable the pushdown of builtin function json_unquote() to TiKV. [#26265](https://github.com/pingcap/tidb/pull/26265)
+ - store/copr: support retry for mpp query [#26480](https://github.com/pingcap/tidb/pull/26480)
+ - Change the lock record into put record for the index keys using point/batch point get for update read. [#26225](https://github.com/pingcap/tidb/pull/26225)
+ - Forbid creating view from stale query [#26200](https://github.com/pingcap/tidb/pull/26200)
+ - planner/core: thoroughly push down count-distinct agg in the MPP mode. [#26194](https://github.com/pingcap/tidb/pull/26194)
+ - mpp: check the tiflash availabilities before launching mpp queries. [#26192](https://github.com/pingcap/tidb/pull/26192)
+ - Enlarge the variable tidb_stmt_summary_max_stmt_count default value from 200 to 3000 [#25874](https://github.com/pingcap/tidb/pull/25874)
+ - Do not allow setting read timestamp to a future time. [#25763](https://github.com/pingcap/tidb/pull/25763)
+ - Log warnings when agg function can not be pushdown in explain statement [#25737](https://github.com/pingcap/tidb/pull/25737)
+ - Add cluster information of evicted count. [#25587](https://github.com/pingcap/tidb/pull/25587)
+
++ TiKV
+
+ - Make prewrite 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 updating `max_ts` with the stale read request's `start_ts` [#10451](https://github.com/tikv/tikv/pull/10451)
+ - Separate read write ready to reduce read latency [#10592](https://github.com/tikv/tikv/pull/10592)
+ - Reduce impact on data import speed with I/O rate limiting enabled [#10390](https://github.com/tikv/tikv/pull/10390)
+ - Improve load balance between Raft gRPC connections [#10495](https://github.com/tikv/tikv/pull/10495)
+
++ Tools
+
+ + TiCDC
+
+ - Remove file sorter. [#2327](https://github.com/pingcap/ticdc/pull/2327)
+ - Better err msg when PD endpoint missing certificate [#2186](https://github.com/pingcap/ticdc/pull/2186)
+
+ + TiDB Lightning
+
+ - Add retry for restoring schemas [#1294](https://github.com/pingcap/br/pull/1294)
+
+ + Dumpling
+
+ - Always split tables using _tidb_rowid when the upstream is a TiDB v3.x cluster, which helps reduce TiDB's memory [#308](https://github.com/pingcap/dumpling/pull/308)
+ - Reduce dumpling accessing database and information_schema usage and improve dumpling's stability. [#315](https://github.com/pingcap/dumpling/pull/315)
+
+## Bug fixes
+
++ TiDB
+
+ - amend transactions correctly when "modify column" needs reorg data with tidb_enable_amend_pessimistic_txn=on. [#26273](https://github.com/pingcap/tidb/pull/26273)
+ - fix incompatible last_day func behavior in sql mode [#26001](https://github.com/pingcap/tidb/pull/26001)
+ - Make sure limit outputs no more columns than its child [#25980](https://github.com/pingcap/tidb/pull/25980)
+ - Fix the issue that committing pessimistic transactions may report write-conflict errors. [#25973](https://github.com/pingcap/tidb/pull/25973)
+ - planner: handle other-conditions from subqueries correctly when constructing IndexJoin [#25819](https://github.com/pingcap/tidb/pull/25819)
+ - Fix the bug that successful optimistic transactions may report commit errors. [#25803](https://github.com/pingcap/tidb/pull/25803)
+ - Fix incorrect result of set type for merge join [#25695](https://github.com/pingcap/tidb/pull/25695)
+ - Fix the bug that index keys in a pessimistic transaction may be repeatedly committed. [#26482](https://github.com/pingcap/tidb/pull/26482)
+ - planner: fix the risk of integer overflow when locating partitions [#26471](https://github.com/pingcap/tidb/pull/26471)
+ - ddl: fix cast date as timestamp will write invalid value [#26395](https://github.com/pingcap/tidb/pull/26395)
+ - Fix copt-cache metrics, it will display the number of hits/miss/evict on Grafana. [#26344](https://github.com/pingcap/tidb/pull/26344)
+ - fix the bug of annoying logs caused by telemetry [#26284](https://github.com/pingcap/tidb/pull/26284)
+ - fix a bug on the query range of prefix index [#26262](https://github.com/pingcap/tidb/pull/26262)
+ - Fix the issue that concurrently truncating the same partition hangs DDL. [#26239](https://github.com/pingcap/tidb/pull/26239)
+ - planner/core: fix duplicate enum items [#26202](https://github.com/pingcap/tidb/pull/26202)
+ - executor: fix a bug that cte.iterOutTbl did not close correctly [#26148](https://github.com/pingcap/tidb/pull/26148)
+ - load: fix load data with non-utf8 can succeed [#26144](https://github.com/pingcap/tidb/pull/26144)
+ - fix unsigned int window function error [#26027](https://github.com/pingcap/tidb/pull/26027)
+ - Fix the issue that TiDB may panic when resolving async-commit locks. [#25862](https://github.com/pingcap/tidb/pull/25862)
+ - Make Stale Read fully support prepare statement [#25800](https://github.com/pingcap/tidb/pull/25800)
+ - Fix the issue that ODBC-styled literal(like {d '2020-01-01'}...) cannot be used as the expression. [#25578](https://github.com/pingcap/tidb/pull/25578)
+ - fix the bug about unnecessary error when run tidb only [#25555](https://github.com/pingcap/tidb/pull/25555)
+
++ TiKV
+
+ - Fix duration calculation panics on certain platforms [#10569](https://github.com/tikv/tikv/pull/10569)
+ - Fix unencoded keys of `batch_get_command` in load-base-split [#10565](https://github.com/tikv/tikv/pull/10565)
+ - Fix online changing `resolved-ts.advance-ts-interval` can't take effect immediately [#10494](https://github.com/tikv/tikv/pull/10494)
+ - Fix follower meta corruption in rare cases with more than 4 replicas [#10486](https://github.com/tikv/tikv/pull/10486)
+ - Fix panic when building a snapshot twice with encryption enabled [#10464](https://github.com/tikv/tikv/pull/10464)
+ - Fix wrong `tikv_raftstore_hibernated_peer_state` metric [#10432](https://github.com/tikv/tikv/pull/10432)
+ - Fix the wrong arguments type of `json_unquote` [#10428](https://github.com/tikv/tikv/pull/10428)
+ - Fix the bug that index keys in a pessimistic transaction may be repeatedly committed [#10586](https://github.com/tikv/tikv/pull/10586)
+ - Fix `ReadIndex` command returning stale result right after leader is transferred [#10474](https://github.com/tikv/tikv/pull/10474)
+
++ PD
+
+ - Reduce the conflict due to multiple scheduler running in same time [#3857](https://github.com/tikv/pd/pull/3857)
+ - Fix the issue that the scheduler may appear again even if we have already executed the delete operation [#3824](https://github.com/tikv/pd/pull/3824)
+
++ TiFlash
+
+ - Fix the potential panic issue that occurs when running table scan tasks
+ - Fix a bug that TiFlash raises error about `duplicated region` when handling DAQ request
+ - Fix the panic issue that occurs when the read load is heavy
+ - Fix the potential panic issue that occures when executing `DateFormat` function
+ - Fix the potential memory leak issue that occurs when executing MPP tasks
+ - Fix the issue of unexpected results when executing aggregation functions `COUNT` or `COUNT DISTINCT`
+ - Fix a potential bug that TiFlash can not restore data when deployed on multi disks
+ - Fix the issue that TiDB Dashboard can not display disk information of TiFlash correctly
+ - Fix the potential panic issue that occures when deconstructing `SharedQueryBlockInputStream`
+ - Fix the potential panic issue that occures when deconstructing `MPPTask`
+
++ Tools
+
+ + TiCDC
+
+ - Fix support for new collation [#2306](https://github.com/pingcap/ticdc/pull/2306)
+ - Fix minor runtime panic risk [#2300](https://github.com/pingcap/ticdc/pull/2300)
+ - Fix potential DDL loss when owner crashes while executing DDL [#2290](https://github.com/pingcap/ticdc/pull/2290)
+ - Fix trying to resolve locks prematurely [#2266](https://github.com/pingcap/ticdc/pull/2266)
+ - Fix a bug that could cause data losses if a TiCDC node is killed immediately after a table migration [#2033](https://github.com/pingcap/ticdc/pull/2033)
+ - Fix changefeed update to properly handle --sort-dir and --start-ts. [#1921](https://github.com/pingcap/ticdc/pull/1921)
+
+ + Backup & Restore
+
+ - Fix incorrectly calculating the size of data to restore [#1285](https://github.com/pingcap/br/pull/1285)
+ - Fix missed DDL events when restoring from cdclog [#1094](https://github.com/pingcap/br/pull/1094)
+
+ + TiDB Lightning
+
+ - Fix parquet parser for decimal type [#1272](https://github.com/pingcap/br/pull/1272)
+ - Fix integer overflows when calculating key intervals [#1294](https://github.com/pingcap/br/pull/1294)

releases/release-notes.md

@@ -7,6 +7,7 @@ aliases: ['/docs/dev/releases/release-notes/','/docs/dev/releases/rn/']
 
 ## 5.1
 
+- [5.1.1](/releases/release-5.1.1.md)
 - [5.1.0](/releases/release-5.1.0.md)
 
 ## 5.0