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From:Surabhi Bhat Date:July 27 2018 7:32pm
Subject:MySQL Cluster 7.4.21 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

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 7.4.21, 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 7.4.21 (5.6.41-ndb-7.4.21) (2018-07-27, 
General Availability)

    MySQL NDB Cluster 7.4.21 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 5.6.41
    (see Changes in MySQL 5.6.41 (Not yet released, General Availability)

Bugs Fixed

      * NDB Cluster APIs: When Ndb::dropEventOperation() tried to
        clean up a pending event, it failed to clear a
pointer to the
        list of GCI operations being deleted and discarded
        object), so that this pointer referred to a deleted
object. GCI
        operations arriving after this could then be
inserted as part of
        the next such list belonging to the now-deleted
object, leading
        to memory corruption and other issues. (Bug #90011,

      * NDB attempted to drop subscriptions which had already
        been dropped, leading to a data node shutdown with
Error 2341.
        (Bug #27622643)

      * An NDB online backup consists of data, which is fuzzy,
        and a redo and undo log. To restore to a consistent
state it is
        necessary to ensure that the log contains all of the
        spanning the capture of the fuzzy data portion and
beyond to a
        consistent snapshot point. This is achieved by
waiting for a GCI
        boundary to be passed after the capture of data is
complete, but
        before stopping change logging and recording the
stop GCI in the
        backup's metadata.  At restore time, the log is
replayed up to
        the stop GCI, restoring the system to the state it
had at the
        consistent stop GCI. A problem arose when, under
load, it was
        possible to select a GCI boundary which occurred too
early and
        did not span all the data captured. This could lead
        inconsistencies when restoring the backup; these
could be be
        noticed as broken constraints or corrupted BLOB
entries.  Now the
        stop GCI is chosen is so that it spans the entire
duration of the
        fuzzy data capture process, so that the backup log
        contains all data within a given stop GCI. (Bug
        References: See also: Bug #27566346.

On Behalf of MySQL Release Engineering team,
Surabhi Bhat

MySQL Cluster 7.4.21 has been releasedSurabhi Bhat27 Jul