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From:daniel.horecki Date:April 20 2018 2:53pm
Subject:MySQL Cluster 7.4.20 has been released
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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

MySQL Cluster 7.4.20 has been releaseddaniel.horecki20 Apr