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MySQL Router 8.0.12 for MySQL Server 8.0 and 5.7 has been released
Posted by: Sreedhar Sreedhargadda
Date: July 27, 2018 11:33AM

Dear MySQL users,

MySQL Router 8.0.12 is the second GA release for MySQL Router 8.0 series.

MySQL Router 8.0 is highly recommended for use with MySQL Server 8.0 and 5.7.
Please upgrade to MySQL Router 8.0.12.

The MySQL Router is a new building block for high availability solutions
based on MySQL InnoDB clusters.

By taking advantage of the new Group Replication technology, and
combined with the MySQL Shell, InnoDB clusters provide an integrated
solution for high availability and scalability for InnoDB based MySQL
databases, that does not require advanced MySQL expertise.

The deployment of applications with high availability requirements is
greatly simplified by MySQL Router. MySQL client connections are
transparently routed to online members of a InnoDB cluster, with MySQL
server outages and cluster reconfigurations being automatically handled
by the Router.

To download MySQL Router 8.0.12, see the "Generally Available (GA)
Releases" tab at Package
binaries are available for several platforms and also as a source code

Documentation for MySQL Router can be found at


Changes in MySQL Router 8.0.12   (2018-07-27)

   MySQL Router 8 fully supports MySQL 5.7 and MySQL 8, and it
   replaces the MySQL Router 2.x series. If you currently use
   Router 2.0 or 2.1 then we recommend upgrading your
   installation to MySQL Router 8.

Functionality Added or Changed

     * Added the --master-key-reader and --master-key-writer
       options to decouple key (credentials) retrieval from
       daemon startup, as an alternative to using

     * Added the optional --account-host command-line bootstrap
       option to configure the host pattern used for MySQL
       accounts. The default value is '%'.

     * Added the optional --report-host command-line bootstrap
       option to configure Router's externally visible hostname
       that's registered to the MySQL InnoDB cluster metadata

     * The ttl option now accepts floating point values. The
       default ttl value changed from 5 seconds to 0.5 seconds
       (500 milliseconds), and the maximum allowed value changed
       from 4294967295 to 3600.

     * Two new metadata-cache URI options were added:
       disconnect_on_promoted_to_primary controls whether
       existing client connections to a secondary are closed
       when the secondary is promoted as a primary (default=no),
       and disconnect_on_metadata_unavailable controls whether
       existing client connections are closed when the group is
       overloaded (default=no). See the destinations
       configuration option's documentation for additional

     * A mysql-server-mock tool was added to help make group
       replication testing more predictable. Execute
       mysql-server-mock --help for usage details.

Bugs Fixed

     * If querying the metadata server failed, then the metadata
       refresh process would fail and log an error. Now the
       system will attempt to use alternative metadata servers
       instead of only one. (Bug #28082473)

     * When a primary or secondary node goes missing, the
       metadata cache refresh frequency increases to one second
       until the Group Replication status is confirmed. The log
       messages and code comments suggested that this mechanism
       only applies to missing primaries, so they were updated
       to clarify that missing secondaries also increase the
       frequency to one second. (Bug #28059228)

     * Exiting a running router instance by issuing Control + C
       emitted an exception before quitting the process. (Bug

     * Support to compile with Visual Studio 15 2017 was added.
       (Bug #27691313)

     * The optional thread_stack_size configuration option was
       added to define the allocated thread stack size for each
       thread. It is measured in kilobytes and defaults to 64
       with a valid range of 1 to 65535. (Bug #27634367)

     * On Windows, PDB files were added to the Zip download for
       debugging purposes. (Bug #27531828, Bug #89625)

On behalf of Oracle MySQL Release Team
Sreedhar S 

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MySQL Router 8.0.12 for MySQL Server 8.0 and 5.7 has been released
July 27, 2018 11:33AM

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