Documentation Home
MySQL Cluster 6.1 - 7.1 Release Notes
Download these Release Notes
PDF (US Ltr) - 2.8Mb
PDF (A4) - 2.9Mb
EPUB - 0.6Mb

MySQL Cluster 6.1 - 7.1 Release Notes  /  Changes in MySQL Cluster NDB 6.3  /  Changes in MySQL Cluster NDB 6.3.8 (5.1.23-ndb-6.3.8) (2008-01-29, General Availability)

Changes in MySQL Cluster NDB 6.3.8 (5.1.23-ndb-6.3.8) (2008-01-29, General Availability)

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 5.1.23 (see Changes in MySQL 5.1.23 (2008-01-29)).


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

Functionality Added or Changed

  • Important Change; Cluster API: Because NDB_LE_MemoryUsage.page_size_kb shows memory page sizes in bytes rather than kilobytes, it has been renamed to page_size_bytes. The name page_size_kb is now deprecated and thus subject to removal in a future release, although it currently remains supported for reasons of backward compatibility. See The Ndb_logevent_type Type, for more information about NDB_LE_MemoryUsage. (Bug #30271)

  • OPTIMIZE TABLE can now be interrupted. This can be done, for example, by killing the SQL thread performing the OPTIMIZE operation.

  • Now only 2 local checkpoints are stored, rather than 3 as in previous MySQL Cluster versions. This lowers disk space requirements and reduces the size and number of redo log files needed.

  • The mysqld option --ndb-batch-size has been added. This enables control of the size of batches used for running transactions.

  • Node recovery can now be done in parallel, rather than sequentially, which can result in much faster recovery times.

  • Persistence of NDB tables can now be controlled using the session variables ndb_table_temporary and ndb_table_no_logging. ndb_table_no_logging causes NDB tables not to be checkpointed to disk. ndb_table_temporary has the same effect; in addition, when ndb_table_temporary is used, no NDB table schema files are created.

  • ndb_restore now supports basic attribute promotion; that is, data from a column of a given type can be restored to a column using a larger type. For example, Cluster backup data taken from a SMALLINT column can be restored to a MEDIUMINT, INT, or BIGINT column.

    For more information, see ndb_restore — Restore a MySQL Cluster Backup.

Bugs Fixed

  • Important Change; Disk Data: It is no longer possible on 32-bit systems to issue statements appearing to create Disk Data log files or data files greater than 4 GB in size. (Trying to create log files or data files larger than 4 GB on 32-bit systems led to unrecoverable data node failures; such statements now fail with NDB error 1515.) (Bug #29186)

  • Replication: The code implementing heartbeats did not check for possible errors in some circumstances; this kept the dump thread hanging while waiting for heartbeats loop even though the slave was no longer connected. (Bug #33332)

  • High numbers of insert operations, delete operations, or both could cause NDB error 899 (Rowid already allocated) to occur unnecessarily. (Bug #34033)

  • A periodic failure to flush the send buffer by the NDB TCP transporter could cause a unnecessary delay of 10 ms between operations. (Bug #34005)

  • DROP TABLE did not free all data memory. This bug was observed in MySQL Cluster NDB 6.3.7 only. (Bug #33802)

  • A race condition could occur (very rarely) when the release of a GCI was followed by a data node failure. (Bug #33793)

  • Some tuple scans caused the wrong memory page to be accessed, leading to invalid results. This issue could affect both in-memory and Disk Data tables. (Bug #33739)

  • A failure to initialize an internal variable led to sporadic crashes during cluster testing. (Bug #33715)

  • The server failed to reject properly the creation of an NDB table having an unindexed AUTO_INCREMENT column. (Bug #30417)

  • Issuing an INSERT ... ON DUPLICATE KEY UPDATE concurrently with or following a TRUNCATE TABLE statement on an NDB table failed with NDB error 4350 Transaction already aborted. (Bug #29851)

  • The Cluster backup process could not detect when there was no more disk space and instead continued to run until killed manually. Now the backup fails with an appropriate error when disk space is exhausted. (Bug #28647)

  • It was possible in config.ini to define cluster nodes having node IDs greater than the maximum permitted value. (Bug #28298)

  • Under some circumstances, a recovering data node did not use its own data, instead copying data from another node even when this was not required. This in effect bypassed the optimized node recovery protocol and caused recovery times to be unnecessarily long. (Bug #26913)

  • Cluster Replication: Consecutive DDL statements involving tables (CREATE TABLE, ALTER TABLE, and DROP TABLE) could be executed so quickly that previous DDL statements upon which they depended were not yet written in the binary log.

    For example, if DROP TABLE foo was issued immediately following CREATE TABLE foo, the DROP statement could fail because the CREATE had not yet been recorded. (Bug #34006)

  • Cluster Replication: ndb_restore -e restored excessively large values to the ndb_apply_status table's epoch column when restoring to a MySQL Cluster version supporting Micro-GCPs from an older version that did not support these.

    A workaround when restoring to MySQL Cluster releases supporting micro-GCPs previous to MySQL Cluster NDB 6.3.8 is to perform a 32-bit shift on the epoch column values to reduce them to their proper size. (Bug #33406)

  • Cluster API: Transactions containing inserts or reads would hang during NdbTransaction::execute() calls made from NDB API applications built against a MySQL Cluster version that did not support micro-GCPs accessing a later version that supported micro-GCPs. This issue was observed while upgrading from MySQL Cluster NDB 6.1.23 to MySQL Cluster NDB 6.2.10 when the API application built against the earlier version attempted to access a data node already running the later version, even after disabling micro-GCPs by setting TimeBetweenEpochs equal to 0. (Bug #33895)

  • Cluster API: When reading a BIT(64) value using NdbOperation::getValue(), 12 bytes were written to the buffer rather than the expected 8 bytes. (Bug #33750)

Download these Release Notes
PDF (US Ltr) - 2.8Mb
PDF (A4) - 2.9Mb
EPUB - 0.6Mb