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MySQL Cluster 7.4.24 has been released
Posted by: Jocelyn Ramilison
Date: April 26, 2019 11:00AM


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 7.4.24 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/7.4/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 7.4.24 (5.6.44-ndb-7.4.24) (2019-04-26, General Availability)

   MySQL NDB Cluster 7.4.24 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
   https://dev.mysql.com/downloads/cluster/.

   For an overview of changes made in MySQL NDB Cluster 7.4, see
   What is New in NDB Cluster 7.4
(http://dev.mysql.com/doc/refman/5.6/en/mysql-cluster-what-is-new-7-4.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 5.6
   through MySQL 5.6.44 (see Changes in MySQL 5.6.44 (2019-04-25,
   General Availability)
   (http://dev.mysql.com/doc/relnotes/mysql/5.6/en/news-5-6-44.html)).


Functionality Added or Changed


     * Building with CMake3 is now supported by the
       compile-cluster script included in the NDB source
       distribution.

Bugs Fixed


     * When a pushed join executing in the DBSPJ block had to
       store correlation IDs during query execution, memory for
       these was allocated for the lifetime of the entire query
       execution, even though these specific correlation IDs are
       required only when producing the most recent batch in the
       result set. Subsequent batches require additional
       correlation IDs to be stored and allocated; thus, if the
       query took sufficiently long to complete, this led to
       exhaustion of query memory (error 20008). Now in such
       cases, memory is allocated only for the lifetime of the
       current result batch, and is freed and made available for
       re-use following completion of the batch. (Bug #29336777)
       References: See also: Bug #26995027.

     * In some cases, one and sometimes more data nodes
       underwent an unplanned shutdown while running
       ndb_restore. This occurred most often, but was not always
       restircted to, when restoring to a cluster having a
       different number of data nodes from the cluster on which
       the original backup had been taken.
       The root cause of this issue was exhaustion of the pool
       of SafeCounter objects, used by the DBDICT kernel block
       as part of executing schema transactions, and taken from
       a per-block-instance pool shared with protocols used for
       NDB event setup and subscription processing. The
       concurrency of event setup and subscription processing is
       such that the SafeCounter pool can be exhausted; event
       and subscription processing can handle pool exhaustion,
       but schema transaction processing could not, which could
       result in the node shutdown experienced during
       restoration.
       This problem is solved by giving DBDICT schema
       transactions an isolated pool of reserved SafeCounters
       which cannot be exhausted by concurrent NDB event
       activity. (Bug #28595915)

     * ndb_restore did not restore autoincrement values
       correctly when one or more staging tables were in use. As
       part of this fix, we also in such cases block applying of
       the SYSTAB_0 backup log, whose content continued to be
       applied directly based on the table ID, which could
       ovewrite the autoincrement values stored in SYSTAB_0 for
       unrelated tables. (Bug #27917769, Bug #27831990)
       References: See also: Bug #27832033.

     * ndb_restore employed a mechanism for restoring
       autoincrement values which was not atomic, and thus could
       yield incorrect autoincrement values being restored when
       multiple instances of ndb_restore were used in parallel.
       (Bug #27832033)
       References: See also: Bug #27917769, Bug #27831990.

     * An NDB table having both a foreign key on another NDB
       table using ON DELETE CASCADE and one or more TEXT or
       BLOB columns leaked memory. (Bug #27484882)

     * When executing the redo log in debug mode it was possible
       for a data node to fail when deallocating a row. (Bug
       #93273, Bug #28955797)

On Behalf of Oracle/MySQL Release Engineering Team,
Hery Ramilison


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MySQL Cluster 7.4.24 has been released
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