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MySQL Cluster 7.6.11 has been released
Posted by: Lars Tangvald
Date: July 23, 2019 01:14AM

Dear MySQL Users,

MySQL Cluster is the distributed, shared-nothing variant of MySQL.
This storage engine provides:

- In-Memory storage - Real-time performance (with optional
checkpointing to disk)
- Transparent Auto-Sharding - Read & write scalability
- Active-Active/Multi-Master geographic replication

- 99.999% High Availability with no single point of failure
and on-line maintenance
- NoSQL and SQL APIs (including C++, Java, http, Memcached
and JavaScript/Node.js)

MySQL Cluster 7.6.11 has been released and can be downloaded from

http://www.mysql.com/downloads/cluster/

where you will also find Quick Start guides to help you get your
first MySQL Cluster database up and running.

MySQL Cluster 7.6 is also available from our repository for Linux
platforms, go here for details:

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

The release notes are available from

http://dev.mysql.com/doc/relnotes/mysql-cluster/7.6/en/index.html

MySQL Cluster enables users to meet the database challenges of next
generation web, cloud, and communications services with uncompromising
scalability, uptime and agility.

More details can be found at

http://www.mysql.com/products/cluster/

Enjoy !


==============================================================================
Changes in MySQL NDB Cluster 7.6.11 (5.7.27-ndb-7.6.11) (2019-07-23, General Availability)

   MySQL NDB Cluster 7.6.11 is a new release of NDB 7.6, based
   on MySQL Server 5.7 and including features in version 7.6 of
   the NDB storage engine, as well as fixing recently discovered
   bugs in previous NDB Cluster releases.

   Obtaining NDB Cluster 7.6.  NDB Cluster 7.6 source code and
   binaries can be obtained from
   https://dev.mysql.com/downloads/cluster/.

   For an overview of changes made in NDB Cluster 7.6, see What
   is New in NDB Cluster 7.6
(https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-what-is-new-7-6.html).

   This release also incorporates all bug fixes and changes made
   in previous NDB Cluster releases, as well as all bug fixes
   and feature changes which were added in mainline MySQL 5.7
   through MySQL 5.7.27 (see Changes in MySQL 5.7.27 (2019-07-22, General Availability)
(https://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-27.html)).


Functionality Added or Changed


     * Building with CMake3 is now supported by the
       compile-cluster script included in the NDB source
       distribution.

Bugs Fixed


     * Important Change: The dependency of ndb_restore on the
       NDBT library, which is used for internal testing only,
       has been removed. This means that the program no longer
       prints NDBT_ProgramExit: ... when terminating.
       Applications that depend upon this behavior should be
       updated to reflect this change when upgrading to this
       release.

     * NDB Replication: NDB did not handle binary logging of
       virtual generated columns of type BLOB correctly. Now
       such columns are always regarded as having zero length.

     * A pushed join with ORDER BY did not always return the
       rows of the result in the specified order. This could
       occur when the optimizer used an ordered index to provide
       the ordering and the index used a column from the table
       that served as the root of the pushed join. (Bug
       #29860378)

     * The requestInfo fields for the long and short forms of
       the LQHKEYREQ signal had diffferent definitions; bits
       used for the key length in the short version were reused
       for flags in the long version, since the key length is
       implicit in the section length of the long version of the
       dignal but it was possible for long LQHKEYREQ signals to
       contain a keylength in these same bits, which could be
       misinterpreted by the receiving local query handler,
       potentially leading to errors. Checks have now been
       implemented to make sure that this no longer happens.
       (Bug #29820838)

     * Lack of SharedGlobalMemory was incorrectly reported as
       lack of undo buffer memory, even though the cluster used
       no disk data tables. (Bug #29806771)
       References: This issue is a regression of: Bug #92125,
       Bug #28537319.

     * Long TCKEYREQ signals did not always use the expected
       format when invoked from TCINDXREQ processing. (Bug
       #29772731)

     * Improved error message printed when the maximum offset
       for a FIXED column is exceeded. (Bug #29714670)

     * Data nodes could fail due to an assert in the DBTC block
       under certain circumstances in resource-constrained
       environments. (Bug #29528188)

     * When the DBSPJ block called the internal function
       lookup_resume() to schedule a previously enqueued
       operation, it used a correlation ID which could have been
       produced from its immediate ancestor in the execution
       order, and not its parent in the query tree as assumed.
       This could happen during execution of a SELECT
       STRAIGHT_JOIN query.
       Now NDB checks whether the execution ancestor is
       different from the query tree parent, and if not,
       performs a lookup of the query tree parent, and the
       parent's correlation ID is enqueued to be executed later.
       (Bug #29501263)

     * When a new master took over, sending a MASTER_LCP_REQ
       signal and executing MASTER_LCPCONF from participating
       nodes, it expected that they had not completed the
       current local checkpoint under the previous master, which
       need not be true. (Bug #29487340, Bug #29601546)

     * When restoring TINYBLOB columns, ndb_restore now treats
       them as having the BINARY character set. (Bug #29486538)

     * Restoration of epochs by ndb_restore failed due to
       temporary redo errors. Now ndb_restore retries epoch
       updates when such errors occur. (Bug #29466089)

     * ndb_restore --restore-epoch incorrectly reported the stop
       GCP as 1 less than the actual position. (Bug #29343655)

     * Added support which was missing in ndb_restore for
       conversions between the following sets of types:

          + BLOB and BINARY or VARBINARY columns

          + TEXT and BLOB columns

          + BLOB columns with unequal lengths

          + BINARY and VARBINARY columns with unequal lengths
       (Bug #28074988)

     * Restore points in backups created with the SNAPSHOTSTART
       option (see Using The NDB Cluster Management Client to
       Create a Backup
(https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-backup-using-management-client.html)) were not always
       consistent with epoch boundaries. (Bug #27566346)
       References: See also: Bug #27497461.

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MySQL Cluster 7.6.11 has been released
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