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 7.3.19, 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/7.3/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 7.3.19 (5.6.38-ndb-7.3.19) (2017-10-18,
General Availability)

MySQL NDB Cluster 7.3.19 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
http://dev.mysql.com/downloads/cluster/.

For an overview of changes made in MySQL NDB Cluster 7.3, see
What is New in NDB Cluster 7.3
(http://dev.mysql.com/doc/refman/5.6/en/mysql-cluster-what-is-new-7-3.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 5.6.38 (see Changes in MySQL 5.6.38 (Not yet
released, General Availability)
(http://dev.mysql.com/doc/relnotes/mysql/5.6/en/news-5-6-38.html)).

Bugs Fixed

* Added DUMP code 7027 to facilitate testing of issues
relating to local checkpoints. For more information, see
DUMP 7027
(http://dev.mysql.com/doc/ndb-internals/en/ndb-internals-dump-command-7027.html).
(Bug #26661468)

* A previous fix intended to improve logging of node
failure handling in the transaction coordinator included
logging of transactions that could occur in normal
operation, which made the resulting logs needlessly
verbose. Such normal transactions are no longer written
to the log in such cases. (Bug #26568782)
References: This issue is a regression of: Bug #26364729.

* Some DUMP codes used for the LGMAN kernel block were
incorrectly assigned numbers in the range used for codes
belonging to DBTUX. These have now been assigned symbolic
constants and numbers in the proper range (10001, 10002,
and 10003). (Bug #26365433)

* Node failure handling in the DBTC kernel block consists
of a number of tasks which execute concurrently, and all
of which must complete before TC node failure handling is
complete. This fix extends logging coverage to record
when each task completes, and which tasks remain,
includes the following improvements:

+ Handling interactions between GCP and node failure
handling interactions, in which TC takeover causes
GCP participant stall at the master TC to allow it
to extend the current GCI with any transactions that
were taken over; the stall can begin and end in
different GCP protocol states. Logging coverage is
extended to cover all scenarios. Debug logging is
now more consistent and understandable to users.

+ Logging done by the QMGR block as it monitors
duration of node failure handling duration is done
more frequently. A warning log is now generated
every 30 seconds (instead of 1 minute), and this now
includes DBDIH block debug information (formerly
this was written separately, and less often).

+ To reduce space used, DBTC instance number: is
shortened to DBTC number:.

+ A new error code is added to assist testing.
(Bug #26364729)

* A potential hundredfold signal fan-out when sending a
START_FRAG_REQ signal could lead to a node failure due to
a job buffer full error in start phase 5 while trying to
perform a local checkpoint during a restart. (Bug #86675,
Bug #26263397)
References: See also: Bug #26288247, Bug #26279522.

On Behalf of Oracle/MySQL Release Engineering
Prashant Tekriwal