Hery Ramilison MySQL Cluster 7.4.1 has been released
Sep 26, 2014; 03:51
MySQL Cluster 7.4.1 has been released
Dear MySQL users,
MySQL Cluster 7.4.1 (Milestone Release) is the first public milestone release for MySQL Cluster 7.4.
The MySQL Cluster 7.4.1 DMR can be downloaded from the ?Development Releases? tab at http://dev.mysql.com/downloads/cluster/ where you will also find Quick Start guides to help you get your first MySQL Cluster database up and running.
MySQL Cluster is the distributed, shared-nothing variant of MySQL. This storage engine provides:
MySQL Cluster 7.4 makes significant advances in performance; operational efficiency (such as enhanced reporting and faster restarts and upgrades) and conflict detection and resolution for active-active replication between MySQL Clusters.
The release notes are available from: http://dev.mysql.com/doc/relnotes/mysql-cluster/7.4/en/index.html
MySQL Cluster enables users to meet the database challenges of next generation web, cloud, and communications services with uncompromising scalability, uptime and agility.
As with any other pre-production release, caution should be taken when installing on production level systems or systems with critical data. More information on the Development Milestone Release process can be found at http://dev.mysql.com/doc/mysql-development-cycle/en/development-milestone-releases.html
Note that 7.4.1 includes all features from MySQL Cluster 7.3.
More details can be found at http://www.mysql.com/products/cluster/
Changes in MySQL Cluster NDB 7.4.1 (5.6.20-ndb-7.4.1 2014-09-25)
MySQL Cluster NDB 7.4.1 is a new Developer Milestone release of MySQL Cluster, based on MySQL Server 5.6 and previewing new features under development for version 7.4 of the NDB storage engine.
Obtaining MySQL Cluster NDB 7.4. MySQL Cluster NDB 7.4 source code and binaries can be obtained from http://dev.mysql.com/downloads/cluster/.
For an overview of changes made in MySQL Cluster NDB 7.4, see MySQL Cluster Development in MySQL Cluster NDB 7.4 (http://dev.mysql.com/doc/refman/5.6/en/mysql-cluster-development-5-6-ndb-7-4.html).
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 5.6 through MySQL 5.6.20 (see Changes in MySQL 5.6.20 (2014-07-31) (http://dev.mysql.com/doc/relnotes/mysql/5.6/en/news-5-6-20.html)).
Functionality Added or Changed
* Performance: Several internal methods relating to the NDB receive thread have been optimized to make mysqld more efficient in processing SQL applications with the NDB storage engine. In particular, this work improves the performance of the NdbReceiver::execTRANSID_AI() method, which is commonly used to receive a record from the data nodes as part of a scan operation. (Since the receiver thread sometimes has to process millions of received records per second, it is critical that this method does not perform unnecessary work, or tie up resources that are not strictly needed.) The associated internal functions receive_ndb_packed_record() and handleReceivedSignal() methods have also been improved, and made more efficient.
* Performance: A number of performance and other improvements have been made with regard to node starts and restarts. The following list contains a brief description of each of these changes:
+ Before memory allocated on startup can be used, it must be touched, causing the operating system to allocate the actual physical memory needed. The process of touching each page of memory that was allocated has now been multithreaded, with touch times on the order of 3 times shorter than with a single thread when performed by 16 threads.
+ When performing a node or system restart, it is necessary to restore local checkpoints for the fragments. This process previously used delayed signals at a point which was found to be critical to performance; these have now been replaced with normal (undelayed) signals, which should shorten significantly the time required to back up a MySQL Cluster or to restore it from backup.
+ Previously, there could be at most 2 LDM instances active with local checkpoints at any given time. Now, up to 16 LDMs can be used for performing this task, which increases utilization of available CPU power, and can speed up LCPs by a factor of 10, which in turn can greatly improve restart times. Better reporting of disk writes and increased control over these also make up a large part of this work. A new ndbinfo view disk_write_speed_aggreagate_node provides information about the speed of disk writes for each LDM thread that is in use. The DiskRestartCheckpointSpeed and DiskRestartCheckpointSpeedRestart configuration parameters have been deprecated, and are subject to removal in a future MySQL Cluster release. This release adds the data node configuration parameters MinDiskWriteSpeed, MaxDiskWriteSpeed, MaxDiskWriteSpeedOtherNodeRestart, and MaxDiskWriteSpeedOwnRestart to control write speeds for LCPs and backups when the present node, another node, or no node is currently restarting. For more information, see The ndbinfo disk_write_speed_aggregate_node Table (http://dev.mysql.com/doc/refman/5.6/en/mysql-cluster-ndbinfo-disk-write-speed-aggregate-node.html) , and the descriptions of the MySQL Cluster configuration parameters named previously.
+ Reporting of MySQL Cluster start phases has been improved, with more frequent printouts. New and better information about the start phases and their implementation has also been provided in the sources and documentation. See Summary of MySQL Cluster Start Phases (http://dev.mysql.com/doc/refman/5.6/en/mysql-cluster-start-phases.html).
* Information about memory usage by individual fragments can now be obtained from the memory_per_fragment view added in this release to the ndbinfo information database. This information includes pages having fixed, and variable element size, rows, fixed element free slots, variable element free bytes, and hash index memory usage. For information, see The ndbinfo memory_per_fragment Table (http://dev.mysql.com/doc/refman/5.6/en/mysql-cluster-ndbinfo-memory-per-fragment.html).
* Cluster Replication: Using the ndb_slave_conflict_role server system variable introduced in this release, it is now possible to set the roles of primary and secondary explicitly and dynamically when using conflict detection and resolution with a circular or "active-active" MySQL Cluster Replication setup. This variable can take any one of the values PRIMARY, SECONDARY, PASS, or NULL (the default). (PASS enables a passthrough state in which the effects of any conflict resolution function are ignored.) This can be useful when it is necessary to fail over from the MySQL Cluster acting as the primary. The slave SQL thread must be stopped when the value of this variable is changed. In addition, it is not possible to change it directly between PASS and either of PRIMARY or SECONDARY. For more information, see the description of ndb_slave_conflict_role as well as MySQL Cluster Replication Conflict Resolution (http://dev.mysql.com/doc/refman/5.6/en/mysql-cluster-replication-conflict-resolution.html).
* Cluster Replication: A number of changes and improvements have been made to exceptions tables for MySQL Cluster Replication conflict detection and resolution. A reserved column name namespace is now employed for metacolumns, which allows the recording of an arbitrary subset of main table columns that are not part of the table's primary key. The names of all metacolumns in the exception table should now be prefixed with NDB$. It is no longer necessary to record the complete primary key. Matching of main table columns to exceptions table columns is now performed solely on the basis of name and type. In addition, you can now record in the exceptions table the values of columns which not part of the main table's primary key. Existing exceptions tables continue to be supported. For additional information, see MySQL Cluster Replication Conflict Resolution (http://dev.mysql.com/doc/refman/5.6/en/mysql-cluster-replication-conflict-resolution.html).
On Behalf of the MySQL Cluster and the Oracle/MySQL RE Team Hery Ramilison
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