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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 6.3.25 (5.1.34-ndb-6.3.25) (2009-05-25)

Changes in MySQL Cluster NDB 6.3.25 (5.1.34-ndb-6.3.25) (2009-05-25)

This is a bugfix release, fixing recently discovered bugs in the previous MySQL Cluster NDB 6.3 release.

This release incorporates all bugfixes and changes made in previous MySQL Cluster releases, as well as all bugfixes and feature changes which were added in mainline MySQL 5.1 through MySQL 5.1.34 (see Changes in MySQL 5.1.34 (2009-04-02)).


Please refer to our bug database at for more details about the individual bugs fixed in this version.

Functionality Added or Changed

  • Two new server status variables Ndb_scan_count and Ndb_pruned_scan_count have been introduced. Ndb_scan_count gives the number of scans executed since the cluster was last started. Ndb_pruned_scan_count gives the number of scans for which NDBCLUSTER was able to use partition pruning. Together, these variables can be used to help determine in the MySQL server whether table scans are pruned by NDBCLUSTER. (Bug #44153)

  • The ndb_config utility program can now provide an offline dump of all MySQL Cluster configuration parameters including information such as default and permitted values, brief description, and applicable section of the config.ini file. A dump in text format is produced when running ndb_config with the new --configinfo option, and in XML format when the options --configinfo --xml are used together. For more information and examples, see ndb_config — Extract MySQL Cluster Configuration Information.

Bugs Fixed

  • Important Change; Partitioning: User-defined partitioning of an NDBCLUSTER table without any primary key sometimes failed, and could cause mysqld to crash.

    Now, if you wish to create an NDBCLUSTER table with user-defined partitioning, the table must have an explicit primary key, and all columns listed in the partitioning expression must be part of the primary key. The hidden primary key used by the NDBCLUSTER storage engine is not sufficient for this purpose. However, if the list of columns is empty (that is, the table is defined using PARTITION BY [LINEAR] KEY()), then no explicit primary key is required.

    This change does not effect the partitioning of tables using any storage engine other than NDBCLUSTER. (Bug #40709)

  • Important Change: Previously, the configuration parameter NoOfReplicas had no default value. Now the default for NoOfReplicas is 2, which is the recommended value in most settings. (Bug #44746)

  • Packaging: The pkg installer for MySQL Cluster on Solaris did not perform a complete installation due to an invalid directory reference in the postinstall script. (Bug #41998)

  • When ndb_config could not find the file referenced by the --config-file option, it tried to read my.cnf instead, then failed with a misleading error message. (Bug #44846)

  • When a data node was down so long that its most recent local checkpoint depended on a global checkpoint that was no longer restorable, it was possible for it to be unable to use optimized node recovery when being restarted later. (Bug #44844)

    References: See also: Bug #26913.

  • ndb_config --xml did not output any entries for the HostName parameter. In addition, the default listed for MaxNoOfFiles was outside the permitted range of values. (Bug #44749)

    References: See also: Bug #44685, Bug #44746.

  • The output of ndb_config --xml did not provide information about all sections of the configuration file. (Bug #44685)

    References: See also: Bug #44746, Bug #44749.

  • Inspection of the code revealed that several assignment operators (=) were used in place of comparison operators (==) in DbdihMain.cpp. (Bug #44567)

    References: See also: Bug #44570.

  • It was possible for NDB API applications to insert corrupt data into the database, which could subquently lead to data node crashes. Now, stricter checking is enforced on input data for inserts and updates. (Bug #44132)

  • ndb_restore failed when trying to restore data on a big-endian machine from a backup file created on a little-endian machine. (Bug #44069)

  • The file ndberror.c contained a C++-style comment, which caused builds to fail with some C compilers. (Bug #44036)

  • When trying to use a data node with an older version of the management server, the data node crashed on startup. (Bug #43699)

  • In some cases, data node restarts during a system restart could fail due to insufficient redo log space. (Bug #43156)

  • NDBCLUSTER did not build correctly on Solaris 9 platforms. (Bug #39080)

    References: See also: Bug #39036, Bug #39038.

  • ndb_restore --print_data did not handle DECIMAL columns correctly. (Bug #37171)

  • The output of ndbd --help did not provide clear information about the program's --initial and --initial-start options. (Bug #28905)

  • It was theoretically possible for the value of a nonexistent column to be read as NULL, rather than causing an error. (Bug #27843)

  • Disk Data: This fix supersedes and improves on an earlier fix made for this bug in MySQL 5.1.18. (Bug #24521)

  • Cluster Replication: A failure when setting up replication events could lead to subsequent data node failures. (Bug #44915)