RN 5.7.21-21 - a restored follow-up fix

laurynas-biveinis · May 17, 2018 · 333b450 · 333b450
1 parent e1962d0
commit 333b450
Show file tree

Hide file tree

Showing 3 changed files with 68 additions and 57 deletions.
diff --git a/doc/source/diagnostics/response_time_distribution.rst b/doc/source/diagnostics/response_time_distribution.rst
@@ -250,7 +250,21 @@ Sets up the logarithm base for the scale.
      :default: OFF
      :range: ON/OFF
 
-This variable enables and disables collection of query times.
+This global variable enables and disables collection of query times.
+
+.. variable:: query_response_time_session_stats
+
+     :cli: No
+     :conf: No
+     :scope: Session
+     :dyn: Yes
+     :vartype: Text
+     :default: GLOBAL
+     :range: ON/OFF/GLOBAL
+
+This variable enables and disables collection of query times on session level, thus
+customizing QRT behavior for individual connections. By default, its value is `GLOBAL`,
+which means that its value is taken from the :variable:`query_response_time_stats` variable.
 
 INFORMATION_SCHEMA Tables
 =========================

diff --git a/doc/source/release-notes/Percona-Server-5.7.21-21.rst b/doc/source/release-notes/Percona-Server-5.7.21-21.rst
@@ -5,15 +5,15 @@ Percona Server 5.7.21-21
 ========================
 
 Percona is glad to announce the release of Percona Server 5.7.21-21
-on April 23, 2018. Downloads are available `here
-<http://www.percona.com/downloads/Percona-Server-5.7/Percona-Server-5.7.21-21/>`_
-and from the :doc:`Percona Software Repositories </installation>`.
+on April 24, 2018. Downloads are available `here <http://www.percona.com/downloads/Percona-Server-5.7/Percona-Server-5.7.21-21/>`_ and from the :doc:`Percona Software Repositories </installation>`.
 
-This release is based on `MySQL 5.7.21
-<http://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-21.html>`_
-and includes all the bug fixes in it.
+This release is based on `MySQL 5.7.21 <http://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-21.html>`_ and includes all the bug fixes in it.
 Percona Server 5.7.21-21 is now the current GA (Generally Available) release
-in the 5.7 series. All software developed by Percona is open-source and free.
+in the 5.7 series.
+This version of Percona Server for MySQL marks the following encryption
+features, previously available as beta, as GA: `Vault keyring plugin <https://www.percona.com/doc/percona-server/5.7/management/data_at_rest_encryption.html#id13>`_, `encryption for InnoDB general tablespaces <https://www.percona.com/doc/percona-server/5.7/management/data_at_rest_encryption.html#id7>`_, and `encryption for binary log files <https://www.percona.com/doc/percona-server/5.7/management/data_at_rest_encryption.html#id14>`_.
+
+All software developed by Percona is open-source and free.
 
 New Features
 ============
@@ -24,41 +24,45 @@ New Features
 
 * A new variable :variable:`innodb_encrypt_online_alter_logs` simultaneously
   turns on encryption of files used by InnoDB for merge sort, online DDL logs,
-  and temporary tables created by InnoDB for online DDL. Bug fixed :psbug:`3819`.
+  and temporary tables created by InnoDB for online DDL. Bug fixed
+  :psbug:`3819`.
 
 * A new variable :variable:`innodb_encrypt_tables` can be set to ``ON``, making
   |InnoDB| tables encrypted by default, to ``FORCE``, disabling creation of
   unencrypted tables, or ``OFF``, restoring the like-before behavior. Bug fixed
   :psbug:`1525`.
 
-* Query response time plugin now can be disabled at session level.
+* Query response time plugin now can be disabled at session level with use
+  of a new variable :variable:`query_response_time_session_stats`.
 
 Bugs Fixed
 ==========
 
-* Query response time plugin installation was able to cause server crash.
-  Bug fixed :psbug:`3959`.
+* Attempting to use a partially-installed query response time plugin could have
+  caused server crash. Bug fixed :psbug:`3959`.
 
 * There was a server crash caused by a materialized temporary table from
   semi-join optimization with key length larger than 1000 bytes. Bug fixed
   :psbug:`296`.
 
-* A regression was causing integer overflow with
+* A regression in the original 5.7 port was causing integer overflow with
   :variable:`thread_pool_stall_limit` variable values bigger than 2 seconds.
   Bug fixed :psbug:`1095`.
 
 * A memory leak took place in |Percona Server| when performance schema is used
   in conjunction with thread pooling. Bug fixed :psbug:`1096`.
 
-* A code clean-up was done to fix compilation with clang, as general warnings 
-  (bug fixed :psbug:`3814`, upstream :mysqlbug:`89646`) so clang 6 specific
-  warnings and errors (bug fixed :psbug:`3893`, upstream :mysqlbug:`98111`).
+* A code clean-up was done to fix compilation with clang, both general warnings
+  (bug fixed :psbug:`3814`, upstream :mysqlbug:`89646`) and clang 6 specific
+  warnings and errors (bug fixed :psbug:`3893`, upstream :mysqlbug:`90111`).
 
-* Compilation warning was fixed for statically linked QRT. Bug fixed
+* Compilation warning was fixed for `-DWITH_QUERY_RESPONSE_TIME=ON` CMake
+  compilation option, which makes QRT to be linked statically. Bug fixed
   :psbug:`3841`.
 
 * |Percona Server| returned empty result for ``SELECT`` query if number of
-  connections exceeded 65535. Bug fixed :psbug:`314`.
+  connections exceeded 65535. Bug fixed :psbug:`314` (upstream
+  :mysqlbug:`89313`).
 
 * A clean-up in |Percona Server| binlog-related code was made to avoid
   uninitialized memory comparison. Bug fixed :psbug:`3925` (upstream
@@ -73,16 +77,11 @@ Bugs Fixed
   introduced in |Percona Server| :rn:`5.7.21-20`, was improved to take into
   account previously created configuration file. Bug fixed :psbug:`3850`.
 
-* A fix introduced in |Percona Server| :rn:`5.7.10-2` which made busy server
-  not to prefer LRU flushing over flush list flushing too strongly was reverted
-  back because of the MT LRU flusher introduction, which removed LRU flushing
-  from the cleaner loop, Bug fixed :psbug:`3812`.
-
 * The possibility of a truncated bitmap file name was fixed in |InnoDB| logging
   subsystem. Bug fixed :psbug:`3926`.
 
-* Non-instrumented functions were used in cached reads and writes of files in
-  fixed-size units. Bug fixed :psbug:`3937` (upstream :mysqlbug:`90264`).
+* Temporary file I/O was not instrumented for Performance Schema. Bug fixed
+  :psbug:`3937` (upstream :mysqlbug:`90264`).
 
 * A crash in the unsafe query warning checks with views took place for
   ``UPDATE`` statement in case of statement binlogging format. Bug fixed
@@ -91,47 +90,42 @@ Bugs Fixed
 MyRocks Changes
 ===============
 
-* A re-implemented variable :variable:`rpl_skip_tx_api` allows to turn on simple
-  |RocksDB| write batches functionality, increasing replication performance
-  by the transaction api skip. Bug fixed :jirabug:`MYR-47`.
+* A re-implemented variable :variable:`rpl_skip_tx_api` allows to turn on
+  simple RocksDB write batches functionality, increasing replication
+  performance by the transaction API skip. Bug fixed :jirabug:`MYR-47`.
 
-* Unpack info bytes indicating the trailing space length in a padded varchar
-  were not read/skipped for value-less fields, causing data corruption and/or
-  server crash. Bug fixed :jirabug:`MYR-232`.
+* Decoding value-less padded varchar fields could under some circumstances
+  cause assertion and/or data corruption. Bug fixed :jirabug:`MYR-232`.
 
 TokuDB Changes
 ===============
 
-* Two new variables introduced for the |TokuDB| fast updates feature,
+* Two new variables introduced to facilitate the |TokuDB| fast updates feature,
   :variable:`tokudb_enable_fast_update` and
-  :variable:`tokudb_enable_fast_upsert` should be now used instead of the 
-  ``NOAR`` keyword, which is now optional at compile time and off by default.
-  Bugs fixed :tdbbug:`63` and :tdbbug:`148`.
+  :variable:`tokudb_enable_fast_upsert`. Bugs fixed :tdbbug:`63` and
+  :tdbbug:`148`.
 
-* A set of compilation fixes as introduced to make |TokuDB| successfully
-  build in 8.0. Bugs fixed :tdbbug:`84`, :tdbbug:`85`, :tdbbug:`114`,
-  :tdbbug:`115`, :tdbbug:`118`, :tdbbug:`128`, :tdbbug:`139`, :tdbbug:`141`,
-  and :tdbbug:`172`.
+* A set of compilation fixes was introduced to make |TokuDB| successfully
+  build in |MySQL| / |Percona Server| 8.0. Bugs fixed :tdbbug:`84`,
+  :tdbbug:`85`, :tdbbug:`114`, :tdbbug:`115`, :tdbbug:`118`, :tdbbug:`128`,
+  :tdbbug:`139`, :tdbbug:`141`, and :tdbbug:`172`.
 
 * Conditional compilation code dependent on version ID in the TokuDB tree was
   separated and arranged to specific version branches. Bugs fixed
   :tdbbug:`133`, :tdbbug:`134`, :tdbbug:`135`, and :tdbbug:`136`.
 
-* An additional code clean-up was made in bounds of 8.0 transition to remove
-  MariaDB-specific constructions. Bugs fixed :tdbbug:`180`, :tdbbug:`181`,
-  and :tdbbug:`182`.
-
-* Alter table comment caused |TokuDB| to rebuild the whole table, which is not
-  needed, as only FRM metadata should be changed. Bug fixed :tdbbug:`130`,
-  and :tdbbug:`137`.
+* ``ALTER TABLE ... COMMENT = ...`` statement caused |TokuDB| to rebuild the
+  whole table, which is not needed, as only FRM metadata should be changed.
+  Bugs fixed :tdbbug:`130` and :tdbbug:`137`.
 
-* Data race on the cache table pair attributes was fixed.
+* Data race on the cache table pair attributes was fixed. Bug fixed
+  :tdbbug:`109`.
 
-Other bugs fixed: :psbug:`3793`, :psbug:`3813`, :psbug:`3815`, :psbug:`3818`,
-:psbug:`3835`, :psbug:`3875` (upstream :mysqlbug:`89916`), :psbug:`3843`
-(upstream :mysqlbug:`89822`), :psbug:`3848`, :psbug:`3856`, :psbug:`3887`,
-:jirabug:`MYR-160`, :jirabug:`MYR-245`, :tdbbug:`109`, :tdbbug:`111`,
-and :tdbbug:`188`.
+Other bugs fixed: :psbug:`3793`, :psbug:`3812`, :psbug:`3813`, :psbug:`3815`,
+:psbug:`3818`, :psbug:`3835`, :psbug:`3875` (upstream :mysqlbug:`89916`),
+:psbug:`3843` (upstream :mysqlbug:`89822`), :psbug:`3848`, :psbug:`3856`,
+:psbug:`3887`, :jirabug:`MYR-160`, :jirabug:`MYR-245`, :tdbbug:`109`,
+:tdbbug:`111`, :tdbbug:`180`, :tdbbug:`181`, :tdbbug:`182`, and :tdbbug:`188`.
 
 
 
diff --git a/doc/source/tokudb/tokudb_variables.rst b/doc/source/tokudb/tokudb_variables.rst
@@ -928,10 +928,11 @@ for bulk loader.
   :scope: Global/Session
   :dyn: Yes
   :vartype: Boolean
-  :default: Off
+  :default: OFF
 
-Enables the fast updates feature, which substantially facilitates execution of
-read-modify-write style queries.
+Toggles the fast updates feature ON/OFF for the ``UPDATE`` statement. Fast
+update involves queries optimization to avoid random reads during their
+execution.
 
 .. variable:: tokudb_enable_fast_upsert
 
@@ -940,9 +941,11 @@ read-modify-write style queries.
   :scope: Global/Session
   :dyn: Yes
   :vartype: Boolean
-  :default: Off
+  :default: OFF
 
-Enables processing upsert messages for the fast updates feature.
+Toggles the fast updates feature ON/OFF for the ``INSERT`` statement. Fast
+update involves queries optimization to avoid random reads during their
+execution.
 
 .. variable:: tokudb_enable_partial_eviction