MySQL Cluster 7.3.7 has been released
Posted by: Sreedhar S
Date: October 17, 2014 07:46PM
Date: October 17, 2014 07:46PM
Dear MySQL users, MySQL Cluster is the distributed, shared-nothing variant of MySQL. This storage engine provides: - Real-time performance based on in-memory storage (with checkpointing to disk) - Read & write scalability through transparent auto-sharding - 99.999% High Availability with no single point of failure and on-line maintenance - SQL and NoSQL API (including C++, Java, http, Memcached and JavaScript/Node.js) - Active-Active/Multi-Master geographic replication MySQL Cluster 7.3.7, has been released and can be downloaded from http://www.mysql.com/downloads/cluster/ where you will also find Quick Start guides to help you get your first MySQL Cluster database up and running. The release notes are available from: http://dev.mysql.com/doc/relnotes/mysql-cluster/7.3/en/mysql -cluster-news-5-6-21-ndb-7-3-7.html MySQL Cluster enables users to meet the database challenges of next generation web, cloud, and communications services with uncompromising scalability, uptime and agility. More details can be found at http://www.mysql.com/products/cluster/ Enjoy ! Changes in MySQL Cluster NDB 7.3.7 (5.6.21-ndb-7.3.7) (2014-10-17) MySQL Cluster NDB 7.3.7 is a new release of MySQL Cluster, based on MySQL Server 5.6 and including features from version 7.3 of the NDB storage engine, as well as fixing a number of recently discovered bugs in previous MySQL Cluster releases. Obtaining MySQL Cluster NDB 7.3. MySQL Cluster NDB 7.3 source code and binaries can be obtained from http://dev.mysql.com/downloads/cluster/. For an overview of changes made in MySQL Cluster NDB 7.3, see MySQL Cluster Development in MySQL Cluster NDB 7.3 (http://dev.mysql.com/doc/refman/5.6/en/mysql-cluster-development- 5-6-ndb-7-3.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 5.6.21 (see Changes in MySQL 5.6.21 (2014-09-23) (http://dev.mysql.com/doc/relnotes/mysql/5.6/en/news-5-6-21.html)). Bundled SSL Update (Commercial Releases) * Starting with this release, commercial distributions of MySQL Cluster NDB 7.3 are built using OpenSSL 1.0.1i. Functionality Added or Changed * After adding new data nodes to the configuration file of a MySQL Cluster having many API nodes, but prior to starting any of the data node processes, API nodes tried to connect to these "missing" data nodes several times per second, placing extra loads on management nodes and the network. To reduce unnecessary traffic caused in this way, it is now possible to control the amount of time that an API node waits between attempts to connect to data nodes which fail to respond; this is implemented in two new API node configuration parameters StartConnectBackoffMaxTime and ConnectBackoffMaxTime. Time elapsed during node connection attempts is not taken into account when applying these parameters, both of which are given in milliseconds with approximately 100 ms resolution. As long as the API node is not connected to any data nodes as described previously, the value of the StartConnectBackoffMaxTime parameter is applied; otherwise, ConnectBackoffMaxTime is used. In a MySQL Cluster with many unstarted data nodes, the values of these parameters can be raised to circumvent connection attempts to data nodes which have not yet begun to function in the cluster, as well as moderate high traffic to management nodes. For more information about the behavior of these parameters, see Defining SQL and Other API Nodes in a MySQL Cluster (http://dev.mysql.com/doc/refman/5.6/en/mysql-cluster-api-defi nition.html). (Bug #17257842) * Added the --exclude-missing-tables option for ndb_restore. When enabled, the option causes tables present in the backup but not in the target database to be ignored. (Bug #57566, Bug #11764704) Bugs Fixed * When assembling error messages of the form Incorrect state for node n state: node_state, written when the transporter failed to connect, the node state was used in place of the node ID in a number of instances, which resulted in errors of this type for which the node state was reported incorrectly. (Bug #19559313, Bug #73801) * In some cases, transporter receive buffers were reset by one thread while being read by another. This happened when a race condition occurred between a thread receiving data and another thread initiating disconnect of the transporter (disconnection clears this buffer). Concurrency logic has now been implemented to keep this race from taking place. (Bug #19554279, Bug #73656) * The failure of a data node could in some situations cause a set of API nodes to fail as well due to the sending of a CLOSE_COMREQ signal that was sometimes not completely initialized. (Bug #19513967) * A more detailed error report is printed in the event of a critical failure in one of the NDB internal sendSignal*() methods, prior to crashing the process, as was already implemented for sendSignal(), but was missing from the more specialized sendSignalNoRelease() method. Having a crash of this type correctly reported can help with identifying configuration hardware issues in some cases. (Bug #19414511) References: See also Bug #19390895. * ndb_restore failed to restore the cluster's metadata when there were more than approximately 17 K data objects. (Bug #19202654) * Parallel transactions performing reads immediately preceding a delete on the same tuple could cause the NDB kernel to crash. This was more likely to occur when separate TC threads were specified using the ThreadConfig configuration parameter. (Bug #19031389) * Attribute promotion between different TEXT types (any of TINYTEXT, TEXT, MEDIUMTEXT, and LONGTEXT) by ndb_restore was not handled properly in some cases. In addition, TEXT values are now truncated according to the limits set by mysqld (for example, values converted to TINYTEXT from another type are truncated to 256 bytes). In the case of columns using a multibyte character set, the value is truncated to the end of the last well-formed character. Also as a result of this fix, conversion to a TEXT column of any size that uses a different character set from the original is now disallowed. (Bug #18875137) * The NDB optimized node recovery mechanism attempts to transfer only relevant page changes to a starting node in order to speed the recovery process; this is done by having the starting node indicate the index of the last global checkpoint (GCI) in which it participated, so that the node that was already running copies only data for rows which have changed since that GCI. Every row has a GCI metacolumn which facilitates this; for a deleted row, the slot formerly stpring this row's data contains a GCI value, and for deleted pages, every row on the missing page is considered changed and thus needs to be sent. When these changes are received by the starting node, this node performs a lookup for the page and index to determine what they contain. This lookup could cause a real underlying page to be mapped against the logical page ID, even when this page contained no data. One way in which this issue could manifest itself occurred after cluster DataMemory usage approached maximum, and deletion of many rows followed by a rolling restart of the data nodes was performed with the expectation that this would free memory, but in fact it was possible in this scenario for memory not to be freed and in some cases for memory usage actually to increase to its maximum. This fix solves these issues by ensuring that a real physical page is mapped to a logical ID during node recovery only when this page contains actual data which needs to be stored. (Bug #18683398, Bug #18731008) * When a data node sent a MISSING_DATA signal due to a buffer overflow and no event data had yet been sent for the current epoch, the dummy event list created to handle this inconsistency was not deleted after the information in the dummy event list was transferred to the completed list. (Bug #18410939) * Incorrect calculation of the next autoincrement value following a manual insertion towards the end of a cached range could result in duplicate values sometimes being used. This issue could manifest itself whne using certain combinations of values for auto_increment_increment, auto_increment_offset, and ndb_autoincrement_prefetch_sz. This issue has been fixed by modifying this calculation to ensure that the next value from the cache as computed by NDB is of the form auto_increment_offset + (N * auto_increment_increment. This avoids any rounding up by the MySQL Server of the returned value, which could result in duplicate entries when the rounded-up value fell outside the range of values cached by NDB. (Bug #17893872) * ndb_show_tables --help output contained misleading information about the --database (-d) option. In addition, the long form of the option (--database) did not work properly. (Bug #17703874) * Using the --help option with ndb_print_file caused the program to segfault. (Bug #17069285) * For multithreaded data nodes, some threads do communicate often, with the result that very old signals can remain at the top of the signal buffers. When performing a thread trace, the signal dumper calculated the latest signal ID from what it found in the signal buffers, which meant that these old signals could be erroneously counted as the newest ones. Now the signal ID counter is kept as part of the thread state, and it is this value that is used when dumping signals for trace files. (Bug #73842, Bug #19582807) * Cluster Replication: The fix for Bug #18770469 in the MySQL Server made changes in the transactional behavior of the temporary conversion tables used when replicating between tables with different schemas. These changes as implemented are not compatible with NDB, and thus the fix for this bug has been reverted in MySQL Cluster. (Bug #19692387) References: See also Bug #19704825. * Cluster API: The fix for Bug #16723708 stopped the ndb_logevent_get_next() function from casting a log event's ndb_mgm_event_category to an enum type, but this change interfered with existing applications, and so the function's original behavior is now reinstated. A new MGM API function exhibiting the corrected behavior ndb_logevent_get_next2() has been added in this release to take the place of the reverted function, for use in applications that do not require backward compatibility. In all other respects apart from this, the new function is identical with its predecessor. (Bug #18354165) * Cluster API: NDB API scans leaked Ndb_cluster_connection objects after nextResult() was called when an operation resulted in an error. This leak locked up the corresponding connection objects in the DBTC kernel block until the connection was closed. (Bug #17730825) * ClusterJ: Retrieval of values from BLOB and TEXT columns by ClusterJ column accessor methods was not handled correctly. (Bug #18419468, Bug #19028487) On Behalf of the MySQL Cluster and the Oracle/MySQL RE Team Sreedhar S
Subject
Views
Written By
Posted
Sorry, you can't reply to this topic. It has been closed.
Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.