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MySQL Cluster 7.6.7 has been released
Posted by: Sreedhar Sreedhargadda
Date: July 27, 2018 11:21AM

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 7.6.7, 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.

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 7.6.7 (5.7.23-ndb-7.6.7) (2018-07-27,
General Availability)

   MySQL NDB Cluster 7.6.7 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
   http://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
   (http://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 5.7.23 (see Changes in MySQL 5.7.23 (2018-07-27,
   General Availability)
   (http://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-23.h
    tml)).

Functionality Added or Changed

     * As part of ongoing work to improve handling of local
       checkpoints and minimize the occurrence of issues
       relating to Error 410 (REDO log overloaded) during LCPs,
       NDB now implements adaptive LCP control, which moderates
       LCP scan priority and LCP writes according to redo log
       usage.
       The following changes have been made with regard to NDB
       configuration parameters:

          + The default value of RecoveryWork is increased from
            50 to 60 (60% of storage reserved for LCP files).

          + The new InsertRecoveryWork parameter controls the
            percentage of RecoveryWork that is reserved for
            insert operations. The default value is 40 (40% of
            RecoveryWork); the minimum and maximum are 0 and 70,
            respectively. Increasing this value allows for more
            writes during an LCP, while limiting the total size
            of the LCP. Decreasing InsertRecoveryWork limits the
            number of writes used during an LCP, but results in
            more space being used.
       Implementing LCP control provides several benefits to NDB
       deployments. Clusters should now survive heavy loads
       using default configurations much better than previously,
       and it should now be possible to run them reliably on
       systems where the available disk space is approximately
       2.1 times the amount of memory allocated to the cluster
       (that is, the amount of DataMemory) or more. It is
       important to bear in mind that the figure just cited does
       not account for disk space used by tables on disk.
       During load testing into a single data node with
       decreasing redo log sizes, it was possible to
       successfully load a very large quantity of data into NDB
       with 16GB reserved for the redo log while using no more
       than 50% of the redo log at any point in time.
       See What is New in NDB Cluster 7.6
       (http://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-
        what-is-new-7-6.html), as well as the descriptions of the
       parameters mentioned previously, for more information.
       (Bug #90709, Bug #27942974, Bug #27942583)
       References: See also: Bug #27926532, Bug #27169282.

Bugs Fixed

     * ndbinfo Information Database: It was possible following a
       restart for (sometimes incomplete) fallback data to be
       used in populating the ndbinfo.processes table, which
       could lead to rows in this table with empty process_name
       values. Such fallback data is no longer used for this
       purpose. (Bug #27985339)

     * NDB Client Programs: The executable file host_info is no
       longer used by ndb_setup.py. This file, along with its
       parent directory share/mcc/host_info, has been removed
       from the NDB Cluster distribution.
       In addition, installer code relating to an unused
       dojo.zip file was removed. (Bug #90743, Bug #27966467,
       Bug #27967561)
       References: See also: Bug #27621546.

     * MySQL NDB ClusterJ: ClusterJ could not be built from
       source using JDK 9. (Bug #27977985)

     * Local checkpoints did not always handle DROP TABLE
       operations correctly. (Bug #27926532)
       References: This issue is a regression of: Bug #26908347,
       Bug #26968613.

     * During the execution of CREATE TABLE ... IF NOT EXISTS,
       the internal open_table() function calls
       ha_ndbcluster::get_default_num_partitions() implicitly
       whenever open_table() finds out that the requested table
       already exists. In certain cases,
       get_default_num_partitions() was called without the
       associated thd_ndb object being initialized, leading to
       failure of the statement with MySQL error 157 Could not
       connect to storage engine. Now
       get_default_num_partitions() always checks for the
       existence of this thd_ndb object, and initializes it if
       necessary.

On behalf MySQL RE team at Oracle
-Sreedhar S 

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