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MySQL Cluster 7.5.18 has been released
Posted by: Jocelyn Ramilison
Date: April 28, 2020 11:09AM


Dear MySQL Users,

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

  - In-Memory storage - Real-time performance (with optional
    checkpointing to disk)
  - 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 7.5.18 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/7.5/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 7.5.18 (5.7.30-ndb-7.5.18) (2020-04-28, General Availability)

   MySQL NDB Cluster 7.5.18 is a new release of MySQL NDB
   Cluster 7.5, based on MySQL Server 5.7 and including features
   in version 7.5 of the NDB
   (https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster.html)
   storage engine, as well as fixing recently discovered bugs in
   previous NDB Cluster releases.

   Obtaining MySQL NDB Cluster 7.5.  MySQL NDB Cluster 7.5
   source code and binaries can be obtained from
   https://dev.mysql.com/downloads/cluster/.

   For an overview of changes made in MySQL NDB Cluster 7.5, see
   What is New in NDB Cluster 7.5
   (https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-what-is-new-7-5.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 5.7
   through MySQL 5.7.30 (see Changes in MySQL 5.7.30
   (2020-04-27, General Availability)
   (https://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-30.html)).


Functionality Added or Changed


     * NDB Client Programs: Two options are added for the
       ndb_blob_tool utility, to enable it to detect missing
       blob parts for which inline parts exist, and to replace
       these with placeholder blob parts (consisting of space
       characters) of the correct length. To check whether there
       are missing blob parts, use the
       ndb_blob_tool --check-missing
       (https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-blob-tool.html#option_ndb_blob_tool_check-missing)
       option. To replace with placeholders any blob parts
       which are missing, use the program's --add-missing
       (https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-blob-tool.html#option_ndb_blob_tool_add-missing)
       option, also added in this release. (Bug #28583971)

     * NDB Client Programs: Removed a dependency from the
       ndb_waiter and ndb_show_tables utility programs on the
       NDBT library. This library, used in NDB
       (https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster.html)
       development for testing, is not required for normal
       use. The visible effect for users from this change is
       that these programs no longer print NDBT_ProgramExit -
       status following completion of a run. Applications that
       depend upon this behavior should be updated to reflect
       this change when upgrading to this release.

     * MySQL NDB ClusterJ: A few Java APIs used by ClusterJ are
       now deprecated in recent Java versions. These adjustments
       have been made to ClusterJ:

          + Replaced all Class.newInstance() calls with
            Class.getDeclaredConstructor().newInstance() calls.
            Also updated the exception handling and the test
            cases wherever required.

          + All the Number classes' constructors that
            instantiate an object from a String or a primitive
            type are deprecated. Replaced all such deprecated
            instantiation calls with the corresponding valueOf()
            method calls.

          + The Proxy.getProxyClass() is now deprecated. The
            DomainTypeHandlerImpl class now directly creates a
            new instance using the Proxy.newProxyInstance()
            method; all references to the Proxy class and its
            constructors are removed from the
            DomainTypeHandlerImpl class. SessionFactoryImpl
            class now uses the interfaces underlying the proxy
            object to identify the domain class rather than
            using the Proxy class. Also updated
            DomainTypeHandlerFactoryTest.

          + The finalize() method is now deprecated. This patch
            does not change the overriding finalize() methods,
            but just suppresses the warnings on them. This
            deprecation will be handled separately in a later
            patch.

          + Updated the CMake configuration to treat deprecation
            warnings as errors when compiling ClusterJ.
       (Bug #29931625)

     * MySQL NDB ClusterJ: The minimum Java version ClusterJ
       supports for MySQL NDB Cluster 8.0 is now Java 8. (Bug
       #29931625)

     * MySQL NDB ClusterJ: The unused antlr3 plugin has been
       removed from the ClusterJ pom file. (Bug #29931625)

     * Added the --ndb-log-fail-terminate
       (https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-options-variables.html#option_mysqld_ndb-log-fail-terminate)
       option for mysqld. When used, this causes the SQL node
       to terminate if it is unable to log all row events.
       (Bug #21911930)


Bugs Fixed

     * MySQL NDB ClusterJ: When a Date value was read from a NDB
       cluster, ClusterJ sometimes extracted the wrong year
       value from the row. It was because the Utility class,
       when unpacking the Date value, wrongly extracted some
       extra bits for the year. This patch makes ClusterJ only
       extract the required bits. (Bug #30600320)

     * MySQL NDB ClusterJ: When the cluster's
       NdbOperation::AbortOption
       (https://dev.mysql.com/doc/ndbapi/en/ndb-ndboperation-abortoption.html)
       type had the value of AO_IgnoreOnError,
       when there was a read error, ClusterJ took that as the
       row was missing and returned null instead of an
       exception. This was because with AO_IgnoreOnErro, the
       execute() method always returns a success code after each
       transaction, and ClusterJ is supposed to check for any
       errors in any of the individual operations; however, read
       operations were not checked by ClusterJ in the case. With
       this patch, read operations are now checked for errors
       after query executions, so that a reading error is
       reported as such. (Bug #30076276)

     * When restoring signed auto-increment columns, ndb_restore
       incorrectly handled negative values when determining the
       maximum value included in the data. (Bug #30928710)

     * When a node ID allocation request failed with NotMaster
       temporary errors, the node ID allocation was always
       retried immediately, without regard to the cause of the
       error. This caused a very high rate of retries, whose
       effects could be observed as an excessive number of Alloc
       node id for node nnn failed log messages (on the order of
       15,000 messages per second). (Bug #30293495)

     * For NDB tables having no explicit primary key,
       NdbReceiverBuffer could be allocated with too small a
       size. This was due to the fact that the attribute bitmap
       sent to NDB from the data nodes always includes the
       primary key. The extra space required for hidden primary
       keys is now taken into consideration in such cases. (Bug
       #30183466)

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


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