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From:Nawaz Nazeer Ahamed Date:January 22 2019 4:32pm
Subject:MySQL Cluster 7.4.23 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 7.4.23 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 7.4.23 (5.6.43-ndb-7.4.23) (2019-01-22,
General Availability)

    MySQL NDB Cluster 7.4.23 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 5.6.43
    (see Changes in MySQL 5.6.43 (2019-01-21, General Availability)

Bugs Fixed

      * NDB Replication: When writes on the master---done in such
        a way that multiple changes affecting BLOB column
        belonging to the same primary key were part of the
        epoch---were replicated to the slave, Error 1022
occurred due to
        constraint violations in the NDB$BLOB_id_part table.
        (Bug #28746560)

      * When only the management server but no data nodes were
        started, RESTART ALL timed out and eventually
failed. This was
        because, as part of a restart, ndb_mgmd starts a
timer, sends a
        STOP_REQ signal to all the data nodes, and waits for
all of them
        to reach node state SL_CMVMI. The issue arose becaue
        signals were ever sent, and thus no data nodes
reached SL_CMVMI.
        This meant that the timer always expired, causing
the restart to
        fail.  (Bug #28728485, Bug #28698831)
        References: See also: Bug #11757421.

      * It was possible in certain cases for nodes to hang during
        an initial restart. (Bug #28698831)
        References: See also: Bug #27622643.

      * When running a cluster with 4 or more data nodes under
        very high loads, data nodes could sometimes fail
with Error 899
        Rowid already allocated. (Bug #25960230)

      * When starting, a data node copies metadata, while a local
        checkpoint updates metadata. To avoid any conflict,
any ongoing
        LCP activity is paused while metadata is being
copied. An issue
        arose when a local checkpoint was paused on a given
node, and
        another node that was also restarting checked for a
complete LCP
        on this node; the check actually caused the LCP to
be completed
        before copying of metadata was complete and so ended
the pause
        prematurely. Now in such cases, the LCP completion
check waits to
        complete a paused LCP until copying of metadata is
finished and
        the pause ends as expected, within the LCP in which
it began.
        (Bug #24827685)

      * Asynchronous disconnection of mysqld from the cluster
        caused any subsequent attempt to start an NDB API
transaction to
        fail. If this occurred during a bulk delete
operation, the SQL
        layer called HA::end_bulk_delete(), whose
implementation by
        ha_ndbcluster assumed that a transaction had been
started, and
        could fail if this was not the case. This problem is
fixed by
        checking that the transaction pointer used by this
method is set
        before referencing it. (Bug #20116393)

Enjoy and thanks for the support!

On behalf of the MySQL Release Team,
Nawaz Nazeer Ahamed

MySQL Cluster 7.4.23 has been releasedNawaz Nazeer Ahamed22 Jan 2019