This is a new Beta development release, fixing recently discovered bugs in previous MySQL Cluster releases.
MySQL Cluster NDB 6.3 no longer in development. MySQL Cluster NDB 6.3 is no longer being actively developed; if you are using a MySQL Cluster NDB 6.3 release, you should upgrade to the latest version of MySQL Cluster, which is available from http://dev.mysql.com/downloads/cluster/ .
Obtaining MySQL Cluster NDB 6.3. This is a source-only release, which you must compile and install using the instructions found in Installing MySQL from Source, and in MySQL Cluster Installation and Upgrades. You can download the GPL source tarball from the MySQL FTP site at ftp://ftp.mysql.com/pub/mysql/download/cluster_telco/.
This Beta release incorporates all bugfixes and changes made in the previous MySQL Cluster NDB 6.3 release, as well as all bugfixes and feature changes which were added in mainline MySQL 5.1 through MySQL 5.1.22 (see Changes in MySQL 5.1.22 (2007-09-24, Release Candidate)).
Please refer to our bug database at http://bugs.mysql.com/ for more details about the individual bugs fixed in this version.
Functionality Added or Changed
Important Note: MySQL Cluster NDB 6.2 and 6.3 source archives are now available in separate commercial and GPL versions. Due to licensing concerns, previous MySQL Cluster NDB 6.2 and 6.3 source archives were removed from the FTP site.
Unnecessary reads when performing a primary key or unique key update have been reduced, and in some cases, eliminated. (It is almost never necessary to read a record prior to an update, the lone exception to this being when a primary key is updated, since this requires a delete followed by an insert, which must be prepared by reading the record.) Depending on the number of primary key and unique key lookups that are performed per transaction, this can yield a considerable improvement in performance.
The output of the ndb_mgm client
now indicates when the cluster is in single user mode.
NDB management client command
provided no output when
node_id was the node ID of a
management or API node. Now, when this occurs, the management
client responds with
node_id: is not a data
In a cluster running in diskless mode and with arbitration disabled, the failure of a data node during an insert operation caused other data node to fail. (Bug #31980)
ndb_restore displayed incorrect backup file version information. This meant (for example) that, when attempting to restore a backup made from a MySQL 5.1.22 cluster to a MySQL Cluster NDB 6.3.3 cluster, the restore process failed with the error Restore program older than backup version. Not supported. Use new restore program. (Bug #31723)
Following an upgrade, ndb_mgmd would fail with an ArbitrationError. (Bug #31690)
NDB storage engine code was not
safe for strict-alias optimization in gcc
after a data node had been shut down could lead to inconsistent
data following a restart of the node.
UPDATE IGNORE could sometimes fail on
NDB tables due to the use of
unitialized data when checking for duplicate keys to be ignored.
An error with an
if statement in
sql/ha_ndbcluster.cc could potentially lead
to an infinite loop in case of failure when working with
AUTO_INCREMENT columns in
An insert or update with combined range and equality constraints
failed when run against an
table with the error Got unknown error from
NDB. An example of such a statement would be
UPDATE t1 SET b = 5 WHERE a IN (7,8) OR a >=
Replication; Cluster Replication: A node failure during replication could lead to buckets out of order; now active subscribers are checked for, rather than empty buckets. (Bug #31701)
When the master mysqld crashed or was
LOST_EVENTS entry was made in
References: See also Bug #21494.
Cluster Replication: Updates performed unnecessary writes to the primary keys of the rows being updated. (Bug #31841)
Slave batching did not work correctly with