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
MySQL Cluster 7.3.20, 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
Changes in MySQL NDB Cluster 7.3.20 (5.6.39-ndb-7.3.20) (2018-01-17,
MySQL NDB Cluster 7.3.20 is a new release of NDB Cluster,
based on MySQL Server 5.6 and including features from version
7.3 of the NDB storage engine, as well as fixing a number of
recently discovered bugs in previous NDB Cluster releases.
Obtaining MySQL NDB Cluster 7.3. MySQL NDB Cluster 7.3
source code and binaries can be obtained from
For an overview of changes made in MySQL NDB Cluster 7.3, see
What is New in NDB Cluster 7.3
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 5.6.39 (see Changes in MySQL 5.6.39 (Not yet
released, General Availability)
* NDB Replication: On an SQL node not being used for a
replication channel with sql_log_bin=0 it was possible
after creating and populating an NDB table for a table
map event to be written to the binary log for the created
table with no corresponding row events. This led to
problems when this log was later used by a slave cluster
replicating from the mysqld where this table was created.
Fixed this by adding support for maintaining a cumulative
any_value bitmap for global checkpoint event operations
that represents bits set consistently for all rows of a
specific table in a given epoch, and by adding a check to
determine whether all operations (rows) for a specific
table are all marked as NOLOGGING, to prevent the
addition of this table to the Table_map held by the
As part of this fix, the NDB API adds a new
getNextEventOpInEpoch3() method which provides
information about any AnyValue received by making it
possible to retrieve the cumulative any_value bitmap.
* A query against the INFORMATION_SCHEMA.FILES table
returned no results when it included an ORDER BY clause.
* The NDBFS block's OM_SYNC flag is intended to make sure
that all FSWRITEREQ signals used for a given file are
synchronized, but was ignored by platforms that do not
support O_SYNC, meaning that this feature did not behave
properly on those platforms. Now the synchronization flag
is used on those platforms that do not support O_SYNC.
(Bug #76975, Bug #21049554)
On Behalf of Oracle/MySQL Release Engineering Team