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-4.0.14.md

@@ -70,7 +70,7 @@ TiDB version: 4.0.14
 
     + TiCDC
 
-        - Improve the error message returned when a PD endpoint misses the certificate [#2184](https://github.com/pingcap/ticdc/pull/2184)
+        - Improve the error message returned when a PD endpoint misses the certificate [#1973](https://github.com/pingcap/ticdc/issues/1973)
         - Make the sorter I/O errors more user-friendly [#1976](https://github.com/pingcap/ticdc/pull/1976)
         - Add a concurrency limit on the Region incremental scan in the KV client to reduce the pressure of TiKV [#1926](https://github.com/pingcap/ticdc/pull/1926)
         - Add metrics for the table memory consumption [#1884](https://github.com/pingcap/ticdc/pull/1884)

releases/release-5.1.1.md

@@ -0,0 +1,165 @@
+---
+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
+
+    - 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)
+
++ TiFlash
+
+    - Support the `HAVING()` function in DAG requests
+
+## 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 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 updating `max_ts` using the Stale Read request's `start_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)
+
++ Tools
+
+    + TiCDC
+
+        - 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)
+
+    + TiDB Lightning
+
+        - Add a retry mechanism 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 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)
+
+## 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 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` [#10565](https://github.com/tikv/tikv/pull/10565)
+    - Fix the issue that changing the `resolved-ts.advance-ts-interval` configuration online cannot take effect immediately [#10494](https://github.com/tikv/tikv/pull/10494)
+    - Fix the issue of follower metadata corruption in rare cases with more than 4 replicas [#10486](https://github.com/tikv/tikv/pull/10486)
+    - 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 [#10432](https://github.com/tikv/tikv/pull/10432)
+    - 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 [#10586](https://github.com/tikv/tikv/pull/10586)
+    - Fix the issue that the `ReadIndex` request returns stale result right after the leader is transferred [#10474](https://github.com/tikv/tikv/pull/10474)
+
++ PD
+
+    - Fix the issue the expected scheduling cannot be generated when the conflict occurs due to multiple schedulers running at the same time [#3857](https://github.com/tikv/pd/pull/3857)
+    - Fix the issue that the scheduler might appear again even if the scheduler is already deleted [#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 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
+
++ Tools
+
+    + TiCDC
+
+        - 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 [#2266](https://github.com/pingcap/ticdc/pull/2266)
+        - 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` to `--sort-dir` and `--start-ts` [#1921](https://github.com/pingcap/ticdc/pull/1921)
+
+    + Backup & Restore
+
+        - Fix the issue that the size of the data to restore is incorrectly calculated [#1285](https://github.com/pingcap/br/pull/1285)
+        - Fix the issue of missed DDL events that occurs 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 the issue of integer overflow 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