Dear MySQL Users,

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

  - In-Memory storage - Real-time performance
  - 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 7.4 makes significant advances in performance;
operational efficiency (such as enhanced reporting and faster restarts
and upgrades) and conflict detection and resolution for active-active
replication between MySQL Clusters.

MySQL Cluster 7.4.20, has been released and can be downloaded from

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

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

Enjoy !


Changes in MySQL NDB Cluster 7.4.20 (5.6.40-ndb-7.4.20)
(2018-04-20, General Availability)

   MySQL NDB Cluster 7.4.20 is a new release of MySQL NDB
   Cluster 7.4, based on MySQL Server 5.6 and including features
   in version 7.4 of the NDB storage engine, as well as fixing
   recently discovered bugs in previous NDB Cluster releases.

   Obtaining MySQL NDB Cluster 7.4.  MySQL NDB Cluster 7.4
   source code and binaries can be obtained from

   For an overview of changes made in MySQL NDB Cluster 7.4, see
   What is New in NDB Cluster 7.4

   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 5.6
   through MySQL 5.6.40 (see Changes in MySQL 5.6.40
   (2018-04-19, General Availability)

Bugs Fixed

     * NDB Cluster APIs: The maximum time to wait which can be
       specified when calling either of the NDB API methods
       Ndb::pollEvents() or pollEvents2() was miscalculated such
       that the method could wait up to 9 ms too long before
       returning to the client. (Bug #88924, Bug #27266086)

     * Race conditions sometimes occurred during asynchronous
       disconnection and reconnection of the transporter while
       other threads concurrently inserted signal data into the
       send buffers, leading to an unplanned shutdown of the
       As part of the work fixing this issue, the internal
       templating function used by the Transporter Registry when
       it prepares a send is refactored to use
       likely-or-unlikely logic to speed up execution, and to
       remove a number of duplicate checks for NULL. (Bug
       #24444908, Bug #25128512)
       References: See also: Bug #20112700.

On Behalf of Oracle/MySQL Release Engineering Team,
Daniel Horecki

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