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MySQL Cluster 6.1 - 7.1 Release Notes  /  Changes in MySQL Cluster NDB 7.0  /  Changes in MySQL Cluster NDB 7.0.32 (5.1.61-ndb-7.0.32) (Not released)

Changes in MySQL Cluster NDB 7.0.32 (5.1.61-ndb-7.0.32) (Not released)

This release incorporates new features in the NDB storage engine and fixes recently discovered bugs in previous MySQL Cluster NDB 7.0 releases.

Obtaining MySQL Cluster NDB 7.0. The latest MySQL Cluster NDB 7.0 binaries for supported platforms can be obtained from Source code for the latest MySQL Cluster NDB 7.0 release can be obtained from the same location. You can also access the MySQL Cluster NDB 7.0 development source tree at

This release also 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 5.1.61 (see Changes in MySQL 5.1.61 (2012-01-10)).


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

Bugs Fixed

  • Important Change: The ALTER ONLINE TABLE ... REORGANIZE PARTITION statement can be used to create new table partitions after new empty nodes have been added to a MySQL Cluster. Usually, the number of partitions to create is determined automatically, such that, if no new partitions are required, then none are created. This behavior can be overridden by creating the original table using the MAX_ROWS option, which indicates that extra partitions should be created to store a large number of rows. However, in this case ALTER ONLINE TABLE ... REORGANIZE PARTITION simply uses the MAX_ROWS value specified in the original CREATE TABLE statement to determine the number of partitions required; since this value remains constant, so does the number of partitions, and so no new ones are created. This means that the table is not rebalanced, and the new data nodes remain empty.

    To solve this problem, support is added for ALTER ONLINE TABLE ... MAX_ROWS=newvalue, where newvalue is greater than the value used with MAX_ROWS in the original CREATE TABLE statement. This larger MAX_ROWS value implies that more partitions are required; these are allocated on the new data nodes, which restores the balanced distribution of the table data.

    For more information, see ALTER TABLE Syntax, and Adding MySQL Cluster Data Nodes Online. (Bug #13714648)

  • When the --skip-config-cache and --initial options were used together, ndb_mgmd failed to start. (Bug #13857301)

  • ALTER ONLINE TABLE failed when a DEFAULT option was used. (Bug #13830980)

  • In some cases, restarting data nodes spent a very long time in Start Phase 101, when API nodes must connect to the starting node (using NdbEventOperation), when the API nodes trying to connect failed in a live-lock scenario. This connection process uses a handshake during which a small number of messages are exchanged, with a timeout used to detect failures during the handshake.

    Prior to this fix, this timeout was set such that, if one API node encountered the timeout, all other nodes connecting would do the same. The fix also decreases this timeout. This issue (and the effects of the fix) are most likely to be observed on relatively large configurations having 10 or more data nodes and 200 or more API nodes. (Bug #13825163)

  • ndbmtd failed to restart when the size of a table definition exceeded 32K.

    (The size of a table definition is dependent upon a number of factors, but in general the 32K limit is encountered when a table has 250 to 300 columns.) (Bug #13824773)

  • An initial start using ndbmtd could sometimes hang. This was due to a state which occurred when several threads tried to flush a socket buffer to a remote node. In such cases, to minimize flushing of socket buffers, only one thread actually performs the send, on behalf of all threads. However, it was possible in certain cases for there to be data in the socket buffer waiting to be sent with no thread ever being chosen to perform the send. (Bug #13809781)

  • When trying to use --hostname=host:port to connect to a MySQL server running on a nonstandard port, the port argument was ignored. (Bug #13364905, Bug #62635)

  • Cluster Replication: Error handling in conflict detection and resolution has been improved to include errors generated for reasons other than operation execution errors, and to distinguish better between permanent errors and transient errors. Transactions failing due to transient problems are now retried rather than leading to SQL node shutdown as occurred in some cases. (Bug #13428909)

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