2.4 What is New in MySQL NDB Cluster

2.4.1 What is New in NDB Cluster 7.3

2.4.2 What is New in NDB Cluster 7.4

This section lists changes in the implementation of NDB Cluster in MySQL NDB Cluster 7.3 and NDB Cluster 7.4, as compared to earlier releases. Changes and features most likely to be of interest in NDB 7.3 are shown in the following list:

• NDB Cluster 7.3 is based on MySQL 5.6. For more information about new features in MySQL Server 5.6, see What Is New in MySQL 5.6.

• NDB Cluster 7.3 supports foreign key constraints on tables. See FOREIGN KEY Constraints, and FOREIGN KEY Constraints, for more information.

• NDB Cluster 7.3 provides support for Node.js using the MySQL NoSQL Connector for JavaScript. See MySQL NoSQL Connector for JavaScript, for more information.

Changes and features in NDB Cluster 7.4 that are most likely to be of interest are shown in the following list:

• NDB Cluster 7.4 is based on MySQL 5.6 (For more information about new features in MySQL Server 5.6, see What Is New in MySQL 5.6)

• NDB Cluster Replication conflict detection and resolution enhancements, including extensions to conflict exceptions tables (see Section 7.11, “NDB Cluster Replication Conflict Resolution”)

• Improvements in the management of circular (“active-active”) replication; primary/secondary assignment with ndb_slave_conflict_role

• Per-fragment memory usage reporting in the memory_per_fragment table

• A number of performance improvements, including the following enhancements:

  • Faster initial allocation of memory

  • Increased parallelization of local checkpoints (LCPs now support 32 fragments rather than 2)

    A group of configuration parameters (MaxDiskWriteSpeed, MaxDiskWriteSpeedOtherNoderestart, MaxDiskWriteSpeedOwnRestart) introduced in this version provides improved control over disk writes during LCPs

    Information about recent disk writes is available in the disk_write_speed_base, disk_write_speed_aggregate, and disk_write_speed_aggregate_node tables added to the ndbinfo database in the this version

  • Faster times for restoring an NDB Cluster from backup

  • Optimization of the NDB receive thread

• Improved error and other reporting during node restarts

This section contains information about NDB Cluster 7.3 releases through 5.6.52-ndb-7.3.34 as well as NDB Cluster 7.4 releases through 5.6.53-ndb-7.4.33 as compared to earlier release series. NDB Cluster 8.0 is available as a General Availability (GA) release, beginning with NDB 8.0.19; see What is New in NDB Cluster, for more information about new features and other changes in NDB 8.0. NDB Cluster 7.6 and 7.5 are previous GA releases still supported in production; for more information, see MySQL NDB Cluster 7.5 and NDB Cluster 7.6. NDB Cluster 7.4 and 7.3 are previous GA releases still supported in production, although we recommend that new deployments for production use NDB Cluster 8.0; see Section 2.4.2, “What is New in NDB Cluster 7.4”, and Section 2.4.1, “What is New in NDB Cluster 7.3”, for more information.