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MySQL NDB Cluster 6.1 - 7.1 Release Notes  /  Changes in MySQL Cluster NDB 6.3  /  Changes in MySQL Cluster NDB 6.3.4 (5.1.22-ndb-6.3.4) (2007-10-15)

Changes in MySQL Cluster NDB 6.3.4 (5.1.22-ndb-6.3.4) (2007-10-15)

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 .

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

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 for more details about the individual bugs fixed in this version.

Functionality Added or Changed

  • Incompatible Change: The --ndb_optimized_node_selection startup option for mysqld now permits a wider range of values and corresponding behaviors for SQL nodes when selecting a transaction coordinator.

    You should be aware that the default value and behavior as well as the value type used for this option have changed, and that you may need to update the setting used for this option in your my.cnf file prior to upgrading mysqld. See Server System Variables, for more information.

  • Replication: On MySQL replication slaves having multiple network interfaces, it is now possible to set which interface to use for connecting to the master using the MASTER_BIND='interface' option in a CHANGE MASTER TO statement. (Bug #25939, Bug #11746389)

  • Cluster Replication: A new configuration parameter TimeBetweenEpochsTimeout enables a timeout to be set for time between epochs. (Bug #31276)

  • Cluster Replication: A replication heartbeat mechanism has been added to facilitate monitoring. This provides an alternative to checking log files, making it possible to detect in real time when a slave has failed.

    Configuration of heartbeats is done using a new MASTER_HEARTBEAT_PERIOD = interval clause for the CHANGE MASTER TO statement (see CHANGE MASTER TO Syntax); monitoring can be done by checking the values of the status variables Slave_heartbeat_period and Slave_received_heartbeats (see Server Status Variables).

    The addition of replication heartbeats addresses a number of issues:

    (Bug #20435, Bug #29309, Bug #30932)

  • Cluster Replication: Support for a new conflict resolution function NDB$OLD() has been added for handling simultaneous updates in multi-master and circular replication setups. A new status variable Ndb_conflict_fn_old tracks the number of times that updates are prevented from being applied due to this type of conflict resolution. See MySQL Cluster Replication Conflict Resolution, for more information.

  • Additional checks were implemented to catch unsupported online ALTER TABLE operations. Currently it is not possible to reorder columns or to change the storage engine used for a table using online ALTER TABLE.

    Some redundant checks made during online creation of indexes were removed.

  • A --bind-address option has been added to a number of MySQL client programs: mysql, mysqldump, mysqladmin, mysqlbinlog, mysqlcheck, mysqlimport, and mysqlshow. This is for use on a computer having multiple network interfaces, and enables you to choose which interface is used to connect to the MySQL server.

    A corresponding change was made to the mysql_options() C API function, which now has a MYSQL_OPT_BIND option for specifying the interface. The argument is a host name or IP address (specified as a string).

Bugs Fixed

  • It was possible in some cases for a node group to be lost due to missed local checkpoints following a system restart. (Bug #31525)

  • NDB tables having names containing nonalphanumeric characters (such as $) were not discovered correctly. (Bug #31470)

  • A node failure during a local checkpoint could lead to a subsequent failure of the cluster during a system restart. (Bug #31257)

  • A cluster restart could sometimes fail due to an issue with table IDs. (Bug #30975)

  • Transaction timeouts were not handled well in some circumstances, leading to excessive number of transactions being aborted unnecessarily. (Bug #30379)

  • In some cases, the cluster managment server logged entries multiple times following a restart of ndb_mgmd. (Bug #29565)

  • ndb_mgm --help did not display any information about the -a option. (Bug #29509)

  • An interpreted program of sufficient size and complexity could cause all cluster data nodes to shut down due to buffer overruns. (Bug #29390)

  • The cluster log was formatted inconsistently and contained extraneous newline characters. (Bug #25064)

  • A transaction was not aborted following the failure of statement. (Bug #31320)

  • Online ALTER operations involving a column whose data type has an implicit default value left behind temporary .frm files, causing subsequent DROP DATABASE statements to fail. (Bug #31097)

  • Errors could sometimes occur during an online ADD COLUMN under load. (Bug #31082)

  • Transactions were committed prematurely when LOCK TABLE and SET autocommit = 0 were used together. (Bug #30996)

  • The mysqld_safe script contained a syntax error. (Bug #30624)