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MySQL NDB Cluster 6.1 - 7.1 Release Notes  /  Changes in MySQL Cluster NDB 7.0  /  Changes in MySQL Cluster NDB 7.0.29 (5.1.56-ndb-7.0.29) (2011-12-15)

Changes in MySQL Cluster NDB 7.0.29 (5.1.56-ndb-7.0.29) (2011-12-15)

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 5.1.56 (see Changes in MySQL 5.1.56 (2011-03-01)).


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

Bugs Fixed

  • Added the MinFreePct data node configuration parameter, which specifies a percentage of data node resources to hold in reserve for restarts. The resources monitored are DataMemory, IndexMemory, and any per-table MAX_ROWS settings (see CREATE TABLE Syntax). The default value of MinFreePct is 5, which means that 5% from each these resources is now set aside for restarts. (Bug #13436216)

  • Because the log event buffer used internally by data nodes was circular, periodic events such as statistics events caused it to be overwritten too quickly. Now the buffer is partitioned by log event category, and its default size has been increased from 4K to 8K. (Bug #13394771)

  • The BatchSize and BatchByteSize configuration parameters, used to control the maximum sizes of result batches, are defined as integers. However, the values used to store these were incorrectly interpreted as numbers of bytes in the NDB kernel. This caused the DBLQH kernel block to fail to detect when the specified BatchByteSize was consumed. (Bug #13355055)

  • Previously, forcing simultaneously the shutdown of multiple data nodes using SHUTDOWN -F in the ndb_mgm management client could cause the entire cluster to fail. Now in such cases, any such nodes are forced to abort immediately. (Bug #12928429)

  • SELECT statements using LIKE CONCAT(...) OR LIKE CONCAT(...) in the WHERE clause returned incorrect results when run against NDB tables. (Bug #11765142, Bug #58073)

  • Cluster Replication: With many SQL nodes, all writing binary logs, connected to a MySQL Cluster, RENAME TABLE could cause data node processes (ndbmtd) to fail. (Bug #13447705)

  • Cluster Replication: It was possible for PURGE MASTER LOGS and SHOW BINARY LOGS to deadlock when run concurrently. (Bug #13400021)