Dear MySQL users,

MySQL Server 5.7.12, a new version of the popular Open Source
Database Management System, has been released. MySQL 5.7.12 is
recommended for use on production systems.

Starting with MySQL Server 5.7.12, we are introducing the concept of
Rapid Plugins. Out of the box, 5.7.12 follows the same stability promise
as our current release process, but it also allows for plugins with
additional functionality to be installed very easily. The first plugin
to be released with MySQL Server 5.7.12 following this concept is the
new X Plugin, which exposes a new communications protocol called the X
Protocol. The expanded capabilities of the X Protocol enable us to
provide the new X DevAPI in our MySQL Connectors and Client
applications, like the new MySQL Shell. The goal of the X DevAPI is to
support a new schema object type called document collections as well as
relational and combined document store/relational capabilities. Now
developers, designers and DBAs can deploy MySQL databases that implement
document store, relational, or hybrid document/relation models. For
documentation about how to get started using MySQL as a document store,
see http://dev.mysql.com/doc/refman/5.7/en/document-store.html.

For an overview of what's new in MySQL 5.7, please see

http://dev.mysql.com/doc/refman/5.7/en/mysql-nutshell.html

For information on installing MySQL 5.7.12 on new servers, please see
the MySQL installation documentation at

http://dev.mysql.com/doc/refman/5.7/en/installing.html

MySQL Server 5.7.12 is available in source and binary form for a number of
platforms from our download pages at

http://dev.mysql.com/downloads/mysql/

MySQL Server 5.7.12 is also available from our repository for Linux
platforms, go here for details:

http://dev.mysql.com/downloads/repo/

Windows packages are available via the Installer for Windows or .ZIP
(no-install) packages for more advanced needs. The point and click
configuration wizards and all MySQL products are available in the
unified Installer for Windows:

http://dev.mysql.com/downloads/installer/

5.7.12 also comes with a web installer as an alternative to the full
installer.

The web installer doesn't come bundled with any actual products
and instead relies on download-on-demand to fetch only the
products you choose to install. This makes the initial download
much smaller but increases install time as the individual products
will need to be downloaded.

We welcome and appreciate your feedback, bug reports, bug fixes,
patches, etc.:

http://bugs.mysql.com/report.php

The following section lists the changes in MySQL 5.7 since
the release of MySQL 5.7.11. It may also be viewed
online at

http://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-12.html

Enjoy!

On behalf on MySQL Release Engineering,
- Bjorn Munch

=============================================================================Changes in MySQL 5.7.12 (2016-04-11)


* Configuration Notes

* Security Notes

* Functionality Added or Changed

* Bugs Fixed

Configuration Notes

* Incompatible Change: To load a keyring plugin, the
--early-plugin-load option is used. Previously, the
default --early-plugin-load option value was the name of
the keyring_file plugin library file. Now the default
value is empty.
Important
InnoDB tablespace encryption requires the keyring_file
plugin to be loaded prior to InnoDB initialization, so
this change of default --early-plugin-load value
introduces an incompatibility for upgrades from 5.7.11 to
5.7.12 or higher. Administrators who have encrypted
InnoDB tablespaces must take explicit action to ensure
continued loading of the keyring_file plugin: Start the
server with an --early-plugin-load option that names the
plugin library file. For example, on platforms where the
plugin library file suffix is .so, use these lines in the
server my.cnf file:
[mysqld]
early-plugin-load=keyring_file.so

On other platforms, adjust the file name suffix as
necessary. For more information, see The MySQL Keyring
(http://dev.mysql.com/doc/refman/5.7/en/keyring.html).
(Bug #80413, Bug #22748738)

Security Notes

* InnoDB: The InnoDB tablespace encryption feature, which
provides at-rest data encryption for InnoDB tables, now
supports Oracle Key Vault for encryption key management.
Oracle Key Vault support relies on the keyring_okv plugin
which is available in MySQL Enterprise Edition. A secure
and robust encryption key management solution such as OKV
is critical for security and for compliance with various
security standards. For more information, see InnoDB
Tablespace Encryption
(http://dev.mysql.com/doc/refman/5.7/en/innodb-tablespace-encryption.html).

* The linked OpenSSL library for the MySQL Commercial
Server has been updated to version 1.0.1s. Issues fixed
in the new version are described at
http://www.openssl.org/news/vulnerabilities.html.
This change does not affect the Oracle-produced MySQL
Community build of MySQL Server, which uses the yaSSL
library instead. (Bug #22685885, Bug #22923458)

* MySQL Enterprise Edition now includes a keyring_okv
plugin that uses Oracle Key Vault for keyring backend
storage. For more information, see The MySQL Keyring
(http://dev.mysql.com/doc/refman/5.7/en/keyring.html).

Functionality Added or Changed

* X Plugin: Exposes new communication protocol called the X
Protocol. For more information, see
http://dev.mysql.com/worklog/task/?id=8338

* X Protocol: Enables to provide the new X DevAPI in MySQL
Connectors and Client applications, like the new MySQL Shell.
Support a new schema object type called document collections as
well as relational and combined document store/relational
capabilities. For more information, see
http://dev.mysql.com/worklog/task/?id=8639

* For queries with many OR conditions, the optimizer now is
more memory-efficient and less likely to exceed the
memory limit imposed by the range_optimizer_max_mem_size
system variable. In addition, the default value for that
variable has been raised from 1536000 to 8388608. (Bug
#79450, Bug #22283790)

Bugs Fixed

* InnoDB; Partitioning: INSERT and SELECT statements
against a partitioned InnoDB table having generated
columns were not always handled correctly. (Bug
#22444530)
References: See also Bug #21776494, Bug #21824564, Bug
#21864838.

* InnoDB: An error was returned on startup when a
replication slave attempted to access an encrypted table.
The server UUID used to compose the master key name was
not persisted to the tablespace data file, resulting in
the use of an incorrect master key. (Bug #22912582)

* InnoDB: In debug builds, an unnecessary buf_block_align()
call could cause a latching order violation. A DML
operation resulted in a page mismatch assertion due to
the same buf_block_align() call. (Bug #22709463, Bug
#21321238)

* InnoDB: An ALTER TABLE ... ADD COLUMN operation on a
table with virtual columns raised an assertion. (Bug
#22650296)

* InnoDB: An unnecessary comparison in tablespace
encryption code caused compiler warnings. (Bug #22645816)

* InnoDB: INNODB_SYS_TABLESPACES could report incorrect
ALLOCATED_SIZE and FILE_SIZE values for a general
tablespace created outside of the data directory. The
i_s_dict_fill_sys_tablespaces() function generated an
incorrect remote file path. (Bug #22590095, Bug #80070)

* InnoDB: In debug builds, an update operation on a table
with virtual columns raised an assertion. (Bug #22572997)

* InnoDB: Modifications were made to InnoDB code to handle
warnings when compiling with Microsoft Visual Studio
2015. (Bug #22542547, Bug #79964)

* InnoDB: Running REPLACE operations on multiple
connections resulted in a hang. (Bug #22530768, Bug
#79185)

* InnoDB: Tabespace encryption-related operations resulted
in a hang on FreeBSD. (Bug #22520464, Bug #79901)

* InnoDB: MySQL stalled when syncing the InnoDB full-text
index cache. (Bug #22516559, Bug #16510576, Bug #73816)

* InnoDB: A CREATE TABLE ... DATA DIRECTORY operation
failed to create a table while innodb_flush_method was
set to O_DIRECT. (Bug #22180006, Bug #79200)
References: This bug is a regression of Bug #21113036.

* InnoDB: In debug builds, a buffer pool resizing operation
resulted in a segmentation violation. The
buf_pool_resizing variable was not protected. (Bug
#22179317)

* InnoDB: The innodb_open_files setting could exceed the
open files limit. (Bug #22111472)

* InnoDB: InnoDB attempted crc32 checksum validation
instead of innodb after a crc32 checksum validation
failure, causing repeated crc32 checksum validation
attempts. Checksum validation order is now optimized
dynamically.
Thanks to Daniel Black for the patch. (Bug #79725, Bug
#22452597)

* Replication: The recovery channel must be set using the
CHANGE MASTER command, and the plugin will not set
default values for the user or password fields in CHANGE
MASTER. The server side recovery channel is restricted to
MASTER_USER and MASTER_PASSWORD, whereas all other
settings for the change master are added on the plugin
side, as done previously. Attempting to use other values
will emit ER_SLAVE_CHANNEL_OPERATION_NOT_ALLOWED errors.
The password value used on CHANGE MASTER commands for the
recovery channel is not logged as plain text in any log
or history files. Also, at the end of recovery, the
plugin no longer resets info objects, but does continue
to purge the logs. (Bug #22815932)

* Replication: When a binlog-less slave connected to a GR
master, it failed with "Error running query" in the error
log. But, there was no information available in "SHOW
SLAVE STATUS" or
P_S.replication_applier_status_by_worker. (Bug #22699395)

* Replication: Setting the relay log recovery to 1 could
generate an error during recovery. Once the relay log
recovery happened, repositories were not initiated and
the server reported an error related to this. Also,
attempting to execute "START GROUP_REPLICATION" in this
situation could cause a crash. To fix this, the recovery
procedure will no longer take the
group_replication_channel into consideration. It now
skips the relay logs of the GR channel to proceed
further. (Bug #22523554)

* Replication: Issuing STOP SLAVE caused a spurious Error
reading packet from server: Lost connection to MySQL
server during query message to be written to the error
log. With this fix, when connection to the master is
lost, the abort_slave flag is checked and the error
message is printed only if the flag is not set. (Bug
#22305605, Bug #79504)
References: See also Bug #12977988, Bug #22290309.

* Replication: When binlog was disabled, the GTID specified
by GTID_NEXT when committing an empty transaction caused
by a 'BEGIN' command was being saved into
GLOBAL@gtid_executed when it should not have been.
However, when binlog was enabled, the same situation did
not save it.
Now, when "@@SESSION.GTID_NEXT == 'UUID:NUMBER'", the
'BEGIN' command causes an
'ER_CANT_DO_IMPLICIT_COMMIT_IN_TRX_WHEN_GTID_NEXT_IS_SET'
error inside an empty or non-empty transaction regardless
of the binlog setting, since it causes an implicit commit
like other DDLs. In this case, the GTID specified by
GTID_NEXT is not saved into GLOBAL@gtid_executed. (Bug
#22130929)

* Replication: When replication was configured but not
started on a slave, the variable currently_executing_gtid
was not properly initialized, but it would be used if the
performance_schema table
replication_applier_status_by_worker
(http://dev.mysql.com/doc/refman/5.7/en/replication-applier-status-by-worker-table.html)
was queried, causing
assertion failures and pointer issues. With this fix, the
variable is now properly initialized at the construction
of the Relay_log_info object. (Bug #21953132, Bug #78722)

* Replication: RESET SLAVE ALL could delete a channel even
when master_pos_wait and wait_until_sql_thread_after_gtid
were still waiting for binlog to be applied. This could
cause a MySQL server exit when the functions tried to
access the channel that was deleted. Now, a channel
reference counter was added that is increased if the
channel should not be deleted when the functions are
running. RESET SLAVE ALL will wait for no reference, and
then it will delete the channel. (Bug #21842399, Bug
#78445)

* Replication: When relay_log_recovery=1, a slave server,
at its initialization, still tried to scan the relay log
files in order to update Retrieved_Gtid_Set and the
transaction parser state, which was an unnecessary waste
of resources because the slave I/O thread would just be
initialized to the SQL thread position in the new relay
log file. With this fix, the slave server skips scanning
the relay log files when relay_log_recovery=1. (Bug
#21798355, Bug #78352)

* Replication: In Slave_worker::write_info(), DBUG_ENTER()
had "Master_info::write_info" as its argument instead of
"Slave_worker::write_info". This fix corrects the
argument. Thanks to Stewart Smith for the patch. (Bug
#21658067, Bug #78133)

* Replication: XA transactions were not handled correctly
when --gtid-mode=ON and the binary log was disabled. It
was because on both master and slave servers, the GTID
state was sometimes not saved and the GTID ownership was
sometimes not cleaned up. This fix makes sure those steps
are now properly performed. (Bug #21618727)
References: See also Bug #22165138, Bug #77740, Bug
#21452916.

* Replication: When a multi-threaded slave stopped with an
error, the same error message was printed three times.
Now, the SQL thread's kill acceptance status is saved,
and only printed once. (Bug #21198611, Bug #77237)

* Replication: When using a multi-threaded slave with
relay_log_info_repository set to TABLE, the slave applier
thread failed to write XA transactions to the worker
configuration. (Bug #20988291)

* Replication: mysqlbinlog --verbose displayed BINARY
(http://dev.mysql.com/doc/refman/5.7/en/binary-varbinary.html)
and VARBINARY
(http://dev.mysql.com/doc/refman/5.7/en/binary-varbinary.html)
data as ordinary strings, causing any single quote
("'") or backslash ("\") among the data to be printed as
such, which was confusing to the users and, in the case
of a backslash, caused the next character to be skipped.
This fix makes mysqlbinlog print the characters'
hexadecimal values ("\x27" for single quote and "\x5c"
for backslash) instead. (Bug #20836250)

* Replication: The test case main.merge failed when the
variables binlog_format was set to "ROW," as the server
tried to get information for table creation for a child
table before it was opened. With this fix, the server
skips getting information for the table in the situation.
(Bug #20574550)

* Replication: If a query on a master generated an error
and partial results were written to the binary log, for
example due to a DROP TABLE IF EXISTS statement applying
to multiple tables that would break foreign key
constraints, when a slave configured with replication
filters encountered the query it could be incorrectly
binary logged. This caused errors such as:
Last_SQL_Error: Query caused different errors on master
and slave. Error on master: message (format)='Cannot
delete or update a parent row: a foreign key constraint
fails' error code=1217 ; Error on slave: actual
message='no error', error code=0. Default database:
'db1'. Query: 'DROP TABLE IF EXISTS `table1` /* generated
by server */'
There were two fixes required for this bug.

+ If a DROP TABLE statement used to drop a single
table fails, to avoid partial results causing this
bug the query is not written to the binary log. If a
DROP TABLE statement used to drop a list of tables
fails, any partial results it generates are written
to the binary log with an error.

+ When a query that generates an error as expected was
received by a slave but it was skipped due to
replication filters, the slave was incorrectly
checking the error. The fix for Bug #76493 ensures
that this comparison of the expected error from the
master with the actual error from the slave does not
happen.
(Bug #77684, Bug #21435502)
References: See also Bug #20797764.

* RTRIM() on large strings could be very slow. (Bug
#22884187)
References: This bug was introduced by Bug #18315770, Bug
#12368495.

* Integer overflow could occur during client handshake
processing, leading to a server exit. (Bug #22722946)

* Missing initializers in the query plan constructor
resulted in Valgrind warnings. (Bug #22573117)

* The obsolete support-files/MySQL-shared-compat.spec.sh
file was removed from distributions. (Bug #22525609)

* mysqlpump failed (syntax error) when a view name
contained a space character. View names are now quoted.
(Bug #22505474)

* UNHEX() with an invalid argument could result in garbage
characters in the warning message. (Bug #22358933)

* Improper host name checking in X509 certificates could
permit man-in-the-middle attacks. (Bug #22295186, Bug
#22738607)

* For debug builds, when an indexed nonnullable generated
column with an empty string generated expression was
updated during an insert for a duplicated key, there was
an optimization that resulted in the server failing to
find the duplicated index, causing an assertion to be
raised. (Bug #22195364)

* A boolean mode full-text search caused a segmentation
fault. (Bug #22176795)

* Queries on generated columns that used WITH ROLLUP could
raise an assertion. (Bug #22131343)

* For a prepared statement that used a derived table, an
assertion could be raised at execute time when checking
statement privileges. (Bug #22108567)

* Concurrent selecting and flushing of a FEDERATED table
while killing connections accessing it could result in a
server exit. (Bug #21918190)

* For debug builds, when a query using join buffering and
one of the tables inserted into the join buffer was
accessed using a dynamic range scan on an index
containing a virtual column, a Valgrind error occurred
when writing columns to the join buffer. (Bug #21872184)

* After iterations of uninstalling and installing the
audit_log plugin, the server could hang. (Bug #21796658)

* With a LOCK TABLES statement in effect, access to
Performance Schema tables could fail, as could SHOW
STATUS with show_compatibility_56=OFF. (Bug #21789221)

* Executing GRANT PROXY statements after altering the
definition of the mysql.user system table could result in
a server exit. (Bug #21699037)

* Certain error messages included part of the SQL statement
that produced them, possibly exposing data. (Bug
#21682356)

* The Performance Schema assumed that tables named using a
#sql prefix were temporary and could be ignored. But it
is possible to create nontemporary tables using that
prefix. The Performance Schema now uses table attributes
other than the name to identify temporary tables. (Bug
#21105475, Bug #22532368, Bug #79934)

* Account filtering performed by the audit_log plugin
incorrectly used the account named by the USER() function
rather than the CURRENT_USER() function (the latter being
the account used for authentication). (Bug #19509471)

* NAME_CONST() can return null if incorrect arguments are
given. In some cases, this was not handled and could
cause a server exit. (Bug #19143243)

* Character set conversion operations on NULL parameters to
prepared statements could cause a server exit. (Bug
#18823979)

* Loose Index Scan was not chosen for queries that had an
equality condition. (Bug #18109609)

* Long or complex SQL statements could cause the parser to
run out of memory. The new parser_max_mem_size system
variable now enables control over the maximum amount of
memory available to the parser. The default value places
no limit on memory available, but the value can be
reduced to protect against out-of-memory situations. (Bug
#14744160)

* A Valgrind warning for memory_free_noop() was silenced.
(Bug #80457, Bug #22782197)

* The MySQL server failed to start if built with the -m32
option on Solaris/Sparc, due to improper static data
alignment in init_delegates(). (Bug #80445, Bug
#22763880)

* The plugin_keyring.h header file misspelled
st_mysql_keyring as st_mysql_keyring_file. (Bug #80414,
Bug #22748867)

* For shared-memory connections on Windows, the client
library opened a handle on a mutex but did not close it.
Subsequent attempts to restart the server on the other
end of the connection failed if the client still had the
mutex handle open. (Bug #80234, Bug #22646779)

* mysqld attempted to initialize plugins specified using
the --early-plugin-load option when the --help option was
specified. (Bug #80077, Bug #22573767)

* ALTER USER IDENTIFIED WITH ... expired the account
password, even if the authentication plugin did not
support password expiration. (Bug #79999, Bug #22551523)

* Some Performance Schema global instruments, if not
enabled at server startup, could be in a state where it
was not possible to enable them at runtime. This
restriction has been lifted. Affected instruments include
mutex, rwlock, cond, and socket instances.
Thanks to Zhang Yingqiang for the patch. (Bug #79784, Bug
#22517278)

* Setting the super_read_only system variable at server
startup had no effect. (Bug #79328, Bug #22233503)

* These audit_log plugin issues were corrected:

+ Calling my_message() from the
MYSQL_AUDIT_GENERAL_CLASS handler resulted in
infinite recursion.

+ Diagnostic messages were improved for the case when
the MYSQL_AUDIT_GENERAL_CLASS handler returned
nonzero.

+ Calling my_message() from the
MYSQL_AUDIT_SERVER_STARTUP_CLASS handler did not
abort server startup as it should have.

+ SHOW GLOBAL VARIABLES produced different output for
the null_audit_abort_value system variable with
show_compatibility_56 enabled and disabled.
(Bug #79079, Bug #22136709, Bug #79091, Bug #22142166,
Bug #79092, Bug #22142209, Bug #21783798)

* For INSERT and UPDATE operations that caused FOREIGN KEY
constraint violations, errors were reported rather than
warnings when the IGNORE keyword was used. (Bug #78853,
Bug #22037930)

* Using the server session service, executing an SQL
statement from a thread with no VIO context could raise
an assertion. (Bug #78734, Bug #21959409)

* Error messages raised by JSON_KEYS() and JSON_EXTRACT()
contained the wrong data. (Bug #78699, Bug #22026278)

* CREATE VIEW statements that used the TIMESTAMPDIFF()
function with MICROSECOND as the unit resulted in
incorrect view definitions. (Bug #78506, Bug #21877062)

* For an existing user, CREATE USER IF NOT EXISTS produced
an error rather than a warning. Similarly, for an
nonexisting user, ALTER USER IF EXISTS produced an error
rather than a warning. (Bug #78374, Bug #21807286)

* For some queries, an Index Merge access plan was chosen
over a range scan when the cost for the range scan was
the same or less. (Bug #77209, Bug #21178196)

* UNHEX() could attempt a left shift of a negative number.
(Bug #73964, Bug #19642015)

* EXPLAIN for SELECT ... FOR UPDATE statements acquired
locks. (Bug #72858, Bug #18899860)

* Processlist state information was not updated correctly
for LOAD DATA INFILE and could show a state different
from executing. (Bug #69375, Bug #16912362)


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