Cluster API: It is now possible to determine, using the ndb_desc utility or the NDB API, which data nodes contain replicas of which partitions. For ndb_desc, a new --extra-node-info option is added to cause this information to be included in its output. A new method Table::getFragmentNodes() is added to the NDB API for obtaining this information programmatically. (Bug #51184)

Formerly, the REPORT and DUMP commands returned output to all ndb_mgm clients connected to the same MySQL Cluster. Now, these commands return their output only to the ndb_mgm client that actually issued the command. (Bug #40865)

Replication; Cluster Replication: MySQL Cluster Replication now supports attribute promotion and demotion for row-based replication between columns of different but similar types on the master and the slave. For example, it is possible to promote an INT column on the master to a BIGINT column on the slave, and to demote a TEXT column to a VARCHAR column.

The implementation of type demotion distinguishes between lossy and non-lossy type conversions, and their use on the slave can be controlled by setting the slave_type_conversions global server system variable.

For more information about attribute promotion and demotion for row-based replication in MySQL Cluster, see Attribute promotion and demotion (MySQL Cluster). (Bug #47163, Bug #46584)

Incompatible Change; Cluster API: The default behavior of the NDB API Event API has changed as follows:

Previously, when creating an Event, DDL operations (alter and drop operations on tables) were automatically reported on any event operation that used this event, but as a result of this change, this is no longer the case. Instead, you must now invoke the event's setReport() method, with the new EventReport value ER_DDL, to get this behavior.

For existing NDB API applications where you wish to retain the old behavior, you must update the code as indicated previously, then recompile, following an upgrade. Otherwise, DDL operations are no longer reported after upgrading libndbnclient.

For more information, see The Event::EventReport Type, and Event::setReport(). (Bug #53308)

Important Change; Cluster Replication: The --ndb-log-empty-epochs option was ignored. Setting the ndb_log_empty_epochs server system variable also had no effect.

As part of the fix for this issue, rows for empty epochs are now recorded in the ndb_binlog_index table even when --ndb-log-empty-epochs is 0. (Bug #49559, Bug #11757505)

If a node or cluster failure occurred while mysqld was scanning the ndb.ndb_schema table (which it does when attempting to connect to the cluster), insufficient error handling could lead to a crash by mysqld in certain cases. This could happen in a MySQL Cluster with a great many tables, when trying to restart data nodes while one or more mysqld processes were restarting. (Bug #52325)

In MySQL Cluster NDB 7.0 and later, DDL operations are performed within schema transactions; the NDB kernel code for starting a schema transaction checks that all data nodes are at the same version before permitting a schema transaction to start. However, when a version mismatch was detected, the client was not actually informed of this problem, which caused the client to hang. (Bug #52228)

After running a mixed series of node and system restarts, a system restart could hang or fail altogether. This was caused by setting the value of the newest completed global checkpoint too low for a data node performing a node restart, which led to the node reporting incorrect GCI intervals for its first local checkpoint. (Bug #52217)

When performing a complex mix of node restarts and system restarts, the node that was elected as master sometimes required optimized node recovery due to missing REDO information. When this happened, the node crashed with Failure to recreate object ... during restart, error 721 (because the DBDICT restart code was run twice). Now when this occurs, node takeover is executed immediately, rather than being made to wait until the remaining data nodes have started. (Bug #52135)

References: See also Bug #48436.

The internal variable ndb_new_handler, which is no longer used, has been removed. (Bug #51858)

ha_ndbcluster.cc was not compiled with the same SAFEMALLOC and SAFE_MUTEX flags as the MySQL Server. (Bug #51857)

When debug compiling MySQL Cluster on Windows, the mysys library was not compiled with -DSAFEMALLOC and -DSAFE_MUTEX, due to the fact that my_socket.c was misnamed as my_socket.cc. (Bug #51856)

Restoring a MySQL Cluster backup between platforms having different endianness failed when also restoring metadata and the backup contained a hashmap not already present in the database being restored to. This issue was discovered when trying to restore a backup made on Solaris/SPARC to a MySQL Cluster running on Solaris/x86, but could conceivably occur in other cases where the endianness of the platform on which the backup was taken differed from that of the platform being restored to. (Bug #51432)

The ndb_print_backup_file utility failed to function, due to a previous internal change in the NDB code. (Bug #41512, Bug #48673)

The mysql client system command did not work properly. This issue was only known to affect the version of the mysql client that was included with MySQL Cluster NDB 7.0 and MySQL Cluster NDB 7.1 releases. (Bug #48574)

The redo log protects itself from being filled up by periodically checking how much space remains free. If insufficient redo log space is available, it sets the state TAIL_PROBLEM which results in transactions being aborted with error code 410 (out of redo log). However, this state was not set following a node restart, which meant that if a data node had insufficient redo log space following a node restart, it could crash a short time later with Fatal error due to end of REDO log. Now, this space is checked during node restarts. (Bug #51723)

Information about several management client commands was missing from (that is, truncated in) the output of the HELP command. (Bug #46114)

The output of the ndb_mgm client REPORT BACKUPSTATUS command could sometimes contain errors due to uninitialized data. (Bug #51316)

The following issues were fixed in the ndb_mgm client REPORT MEMORYUSAGE command:

(Bug #50196)

Issuing a command in the ndb_mgm client after it had lost its connection to the management server could cause the client to crash. (Bug #49219)

When the MemReportFrequency configuration parameter was set in config.ini, the ndb_mgm client REPORT MEMORYUSAGE command printed its output multiple times. (Bug #37632)

The internal ErrorReporter::formatMessage() method could in some cases cause a buffer overflow. (Bug #47120)

A GROUP BY query against NDB tables sometimes did not use any indexes unless the query included a FORCE INDEX option. With this fix, indexes are used by such queries (where otherwise possible) even when FORCE INDEX is not specified. (Bug #50736)

ndb_mgm -e "... REPORT ..." did not write any output to stdout.

The fix for this issue also prevents the cluster log from being flooded with INFO messages when DataMemory usage reaches 100%, and insures that when the usage is decreased, an appropriate message is written to the cluster log. (Bug #31542, Bug #44183, Bug #49782)

InnoDB; Replication: Column length information generated by InnoDB did not match that generated by MyISAM, which caused invalid metadata to be written to the binary log when trying to replicate BIT columns. (Bug #49618)

Replication: Metadata for GEOMETRY fields was not properly stored by the slave in its definitions of tables. (Bug #49836)

References: See also Bug #48776.

Disk Data: Inserts of blob column values into a MySQL Cluster Disk Data table that exhausted the tablespace resulted in misleading no such tuple error messages rather than the expected error tablespace full.

This issue appeared similar to Bug #48113, but had a different underlying cause. (Bug #52201)

Disk Data: The error message returned after atttempting to execute ALTER LOGFILE GROUP on an nonexistent logfile group did not indicate the reason for the failure. (Bug #51111)

Disk Data: DDL operations on Disk Data tables having a relatively small UNDO_BUFFER_SIZE could fail unexpectedly.

Cluster Replication: When mysqld was started with --binlog-do-db or --binlog-ignore-db, no LOST_EVENTS incident was written to the binary log. (Bug #47096)

Cluster API: When reading blob data with lock mode LM_SimpleRead, the lock was not upgraded as expected. (Bug #51034)

Cluster API: A number of issues were corrected in the NDB API coding examples found in the storage/ndb/ndbapi-examples directory in the MySQL Cluster source tree. These included possible endless recursion in ndbapi_scan.cpp as well as problems running some of the examples on systems using Windows or Mac OS X due to the lettercase used for some table names. (Bug #30552, Bug #30737)

On some Unix/Linux platforms, an error during build from source could be produced, referring to a missing LT_INIT program. This is due to versions of libtool 2.1 and earlier. (Bug #51009)

1) In rare cases, if a thread was interrupted during a FLUSH PRIVILEGES operation, a debug assertion occurred later due to improper diagnostics area setup. 2) A KILL operation could cause a console error message referring to a diagnostic area state without first ensuring that the state existed. (Bug #33982)