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MySQL Cluster 7.4.27 has been released
Posted by: Tvarita Jain
Date: January 14, 2020 04:24AM

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 7.4.27 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/



Changes in MySQL NDB Cluster 7.4.27 (5.6.47-ndb-7.4.27) (2020-01-14, General Availability)

MySQL NDB Cluster 7.4.27 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
https://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 5.6.47 .

Bugs Fixed


* If a transaction was aborted while getting a page from
the disk page buffer and the disk system was overloaded,
the transaction hung indefinitely. This could also cause
restarts to hang and node failure handling to fail. (Bug
#30397083, Bug #30360681)
References: See also: Bug #30152258.

* The maximum global checkpoint (GCP) commit lag and GCP
save timeout are recalculated whenever a node shuts down,
to take into account the change in number of data nodes.
This could lead to the unintentional shutdown of a viable
node when the threshold decreased below the previous
value. (Bug #27664092)
References: See also: Bug #26364729.

* Concurrent SELECT and ALTER TABLE statements on the same
SQL node could sometimes block one another while waiting


On behalf of Oracle/MySQL Release Engineering Team,
Tvarita Jain

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