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MySQL Cluster 6.1 - 7.1 Release Notes  /  Changes in MySQL Cluster NDB 7.1  /  Changes in MySQL Cluster NDB 7.1.3 (5.1.44-ndb-7.1.3) (2010-04-12, General Availability)

Changes in MySQL Cluster NDB 7.1.3 (5.1.44-ndb-7.1.3) (2010-04-12, General Availability)

MySQL Cluster NDB 7.1.3 is the first General Availability release in the MySQL Cluster NDB 7.1 release series, incorporating new features in the NDB storage engine and fixing recently discovered bugs in MySQL Cluster NDB 7.1.2-beta and previous MySQL Cluster releases.

Obtaining MySQL Cluster NDB 7.1. The latest MySQL Cluster NDB 7.1 binaries for supported platforms can be obtained from Source code for the latest MySQL Cluster NDB 7.1 release can be obtained from the same location. You can also access the MySQL Cluster NDB 7.1 development source tree at

This release also incorporates all bugfixes and changes made in previous MySQL Cluster NDB 6.x, MySQL Cluster NDB 7.0, and MySQL Cluster NDB 7.1 releases, as well as all bugfixes and feature changes which were added in mainline MySQL 5.1 through MySQL 5.1.44 (see Changes in MySQL 5.1.44 (2010-02-04)).

Functionality Added or Changed

  • Incompatible Change: The schema for the memoryusage table of the ndbinfo information database has changed, as detailed in the following list:

    • The max column has been renamed to total.

    • The used and total (formerly max) columns now display values in bytes rather than memory pages.

    • Added the columns used_pages and total_pages to show the amount of a resource used and total amount available in pages.

    • The size of the memory pages used for calculating data memory (used_pages and total_pages columns) is now 32K rather than 16K.

    For more information, aee The ndbinfo memoryusage Table.

  • Important Change: The experimental pools table has been removed from the ndbinfo database. Information useful to MySQL Cluster administration that was contained in this table should be available from other ndbinfo tables.

  • Important Note: MySQL Cluster 7.1 is now supported for production use on Windows platforms.


    Some limitations specific to Windows remain; the most important of these are given in the following list:

    • There is not yet any Windows installer for MySQL Cluster; you must extract, place, configure, and start the necessary MySQL Cluster executables manually.

    • MySQL Cluster processes cannot yet be installed as Windows services. This means that each process executable must be run from a command prompt, and cannot be backgrounded. If you close the command prompt window in which you started the process, the process terminates.

    • There is as yet no angel process for data nodes; if a data node process quits, it must be restarted manually.

    • ndb_error_reporter is not yet available on Windows.

    • The multi-threaded data node process (ndbmtd) is not yet included in the binary distribution. However, it should be built automatically if you build MySQL Cluster from source.

    As with MySQL Cluster on other supported platforms, you cannot build MySQL Cluster for Windows from the MySQL Server 5.1 sources; you must use the source code from the MySQL Cluster NDB 7.1 tree.

  • Replication; Cluster Replication: MySQL Cluster Replication now supports attribute promotion and demotion for row-based replication between columns of different but similar types on the master and the slave. For example, it is possible to promote an INT column on the master to a BIGINT column on the slave, and to demote a TEXT column to a VARCHAR column.

    The implementation of type demotion distinguishes between lossy and non-lossy type conversions, and their use on the slave can be controlled by setting the slave_type_conversions global server system variable.

    For more information about attribute promotion and demotion for row-based replication in MySQL Cluster, see Attribute promotion and demotion (MySQL Cluster). (Bug #47163, Bug #46584)

Bugs Fixed

  • Important Change; Cluster Replication: The --ndb-log-empty-epochs option was ignored. Setting the ndb_log_empty_epochs server system variable also had no effect.

    As part of the fix for this issue, rows for empty epochs are now recorded in the ndb_binlog_index table even when --ndb-log-empty-epochs is 0. (Bug #49559, Bug #11757505)

  • If a node or cluster failure occurred while mysqld was scanning the ndb.ndb_schema table (which it does when attempting to connect to the cluster), insufficient error handling could lead to a crash by mysqld in certain cases. This could happen in a MySQL Cluster with a great many tables, when trying to restart data nodes while one or more mysqld processes were restarting. (Bug #52325)

  • In MySQL Cluster NDB 7.0 and later, DDL operations are performed within schema transactions; the NDB kernel code for starting a schema transaction checks that all data nodes are at the same version before permitting a schema transaction to start. However, when a version mismatch was detected, the client was not actually informed of this problem, which caused the client to hang. (Bug #52228)

  • After running a mixed series of node and system restarts, a system restart could hang or fail altogether. This was caused by setting the value of the newest completed global checkpoint too low for a data node performing a node restart, which led to the node reporting incorrect GCI intervals for its first local checkpoint. (Bug #52217)

  • When performing a complex mix of node restarts and system restarts, the node that was elected as master sometimes required optimized node recovery due to missing REDO information. When this happened, the node crashed with Failure to recreate object ... during restart, error 721 (because the DBDICT restart code was run twice). Now when this occurs, node takeover is executed immediately, rather than being made to wait until the remaining data nodes have started. (Bug #52135)

    References: See also Bug #48436.

  • The internal variable ndb_new_handler, which is no longer used, has been removed. (Bug #51858)

  • was not compiled with the same SAFEMALLOC and SAFE_MUTEX flags as the MySQL Server. (Bug #51857)

  • When debug compiling MySQL Cluster on Windows, the mysys library was not compiled with -DSAFEMALLOC and -DSAFE_MUTEX, due to the fact that my_socket.c was misnamed as (Bug #51856)

  • Some values shown in the memoryusage table did not match corresponding values shown by the ndb_mgm client ALL REPORT MEMORYUSAGE command. (Bug #51735)

  • The redo log protects itself from being filled up by periodically checking how much space remains free. If insufficient redo log space is available, it sets the state TAIL_PROBLEM which results in transactions being aborted with error code 410 (out of redo log). However, this state was not set following a node restart, which meant that if a data node had insufficient redo log space following a node restart, it could crash a short time later with Fatal error due to end of REDO log. Now, this space is checked during node restarts. (Bug #51723)

  • Restoring a MySQL Cluster backup between platforms having different endianness failed when also restoring metadata and the backup contained a hashmap not already present in the database being restored to. This issue was discovered when trying to restore a backup made on Solaris/SPARC to a MySQL Cluster running on Solaris/x86, but could conceivably occur in other cases where the endianness of the platform on which the backup was taken differed from that of the platform being restored to. (Bug #51432)

  • A mysqld, when attempting to access the ndbinfo database, crashed if could not contact the management server. (Bug #51067)

  • The mysql client system command did not work properly. This issue was only known to affect the version of the mysql client that was included with MySQL Cluster NDB 7.0 and MySQL Cluster NDB 7.1 releases. (Bug #48574)

  • Packaging; Cluster API: The file META-INF/services/org.apache.openjpa.lib.conf.ProductDerivation was missing from the clusterjpa JAR file. This could cause setting openjpa.BrokerFactory to ndb to be rejected. (Bug #52106)

    References: See also Bug #14192154.

  • Disk Data: Inserts of blob column values into a MySQL Cluster Disk Data table that exhausted the tablespace resulted in misleading no such tuple error messages rather than the expected error tablespace full.

    This issue appeared similar to Bug #48113, but had a different underlying cause. (Bug #52201)

  • Disk Data: DDL operations on Disk Data tables having a relatively small UNDO_BUFFER_SIZE could fail unexpectedly.

  • Cluster Replication: When mysqld was started with --binlog-do-db or --binlog-ignore-db, no LOST_EVENTS incident was written to the binary log. (Bug #47096)

  • Cluster API: A number of issues were corrected in the NDB API coding examples found in the storage/ndb/ndbapi-examples directory in the MySQL Cluster source tree. These included possible endless recursion in ndbapi_scan.cpp as well as problems running some of the examples on systems using Windows or Mac OS X due to the lettercase used for some table names. (Bug #30552, Bug #30737)

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