Important Change; Replication: RESET MASTER and RESET SLAVE now reset the values shown for Last_IO_Error, Last_IO_Errno, Last_SQL_Error, and Last_SQL_Errno in the output of SHOW SLAVE STATUS. (Bug #34654)

References: See also Bug #44270.

A new data node configuration parameter MaxLCPStartDelay has been introduced to facilitate parallel node recovery by causing a local checkpoint to be delayed while recovering nodes are synchronizing data dictionaries and other meta-information. For more information about this parameter, see Defining MySQL Cluster Data Nodes. (Bug #43053)

New options are introduced for ndb_restore for determining which tables or databases should be restored:

For more information about these options, see ndb_restore — Restore a MySQL Cluster Backup. (Bug #40429)

Disk Data: It is now possible to specify default locations for Disk Data data files and undo log files, either together or separately, using the data node configuration parameters FileSystemPathDD, FileSystemPathDataFiles, and FileSystemPathUndoFiles. For information about these configuration parameters, see Disk Data file system parameters.

It is also now possible to specify a log file group, tablespace, or both, that is created when the cluster is started, using the InitialLogFileGroup and InitialTablespace data node configuration parameters. For information about these configuration parameters, see Disk Data object creation parameters.

Performance: Updates of the SYSTAB_0 system table to obtain a unique identifier did not use transaction hints for tables having no primary key. In such cases the NDB kernel used a cache size of 1. This meant that each insert into a table not having a primary key required an update of the corresponding SYSTAB_0 entry, creating a potential performance bottleneck.

With this fix, inserts on NDB tables without primary keys can be under some conditions be performed up to 100% faster than previously. (Bug #39268)

Important Note: It is not possible in this release to install the InnoDB plugin if InnoDB support has been compiled into mysqld. (Bug #42610)

References: This bug was introduced by Bug #29263.

Packaging: Packages for MySQL Cluster were missing the libndbclient.so and libndbclient.a files. (Bug #42278)

Partitioning: Executing ALTER TABLE ... REORGANIZE PARTITION on an NDBCLUSTER table having only one partition caused mysqld to crash. (Bug #41945)

References: See also Bug #40389.

If the cluster configuration cache file was larger than 32K, the management server would not start. (Bug #42543)

In some cases, NDB did not check correctly whether tables had changed before trying to use the query cache. This could result in a crash of the debug MySQL server. (Bug #40464)

When using ndbmtd, NDB kernel threads could hang while trying to start the data nodes with LockPagesInMainMemory set to 1. (Bug #43021)

Backup IDs greater than 2³¹ were not handled correctly, causing negative values to be used in backup directory names and printouts. (Bug #43042)

Given a MySQL Cluster containing no data (that is, whose data nodes had all been started using --initial, and into which no data had yet been imported) and having an empty backup directory, executing START BACKUP with a user-specified backup ID caused the data nodes to crash. (Bug #41031)

When using multiple management servers and starting several API nodes (possibly including one or more SQL nodes) whose connectstrings listed the management servers in different order, it was possible for 2 API nodes to be assigned the same node ID. When this happened it was possible for an API node not to get fully connected, consequently producing a number of errors whose cause was not easily recognizable. (Bug #42973)

Triggers on NDBCLUSTER tables caused such tables to become locked. (Bug #42751)

References: See also Bug #16229, Bug #18135.

ndb_error_reporter worked correctly only with GNU tar. (With other versions of tar, it produced empty archives.) (Bug #42753)

When using multi-threaded data nodes, their DataMemory and IndexMemory usage as reported was multiplied by the number of local query handlers (worker threads), making it appear that much more memory was being used than was actually the case. (Bug #42215)

References: See also Bug #42765.

When using multi-threaded data nodes, IndexMemory, MaxNoOfLocalOperations, and MaxNoOfLocalScans were effectively multiplied by the number of local query handlers in use by each ndbmtd instance. (Bug #42765)

References: See also Bug #42215.

When performing more than 32 index or tuple scans on a single fragment, the scans could be left hanging. This caused unnecessary timeouts, and in addition could possibly lead to a hang of an LCP. (Bug #42559)

References: This bug is a regression of Bug #42084.

A data node failure that occurred between calls to NdbIndexScanOperation::readTuples(SF_OrderBy) and NdbTransaction::execute() was not correctly handled; a subsequent call to nextResult() caused a null pointer to be deferenced, leading to a segfault in mysqld. (Bug #42545)

Issuing SHOW GLOBAL STATUS LIKE 'NDB%' before mysqld had connected to the cluster caused a segmentation fault. (Bug #42458)

Data node failures that occurred before all data nodes had connected to the cluster were not handled correctly, leading to additional data node failures. (Bug #42422)

When using ndbmtd for all data nodes, repeated failures of one data node during DML operations caused other data nodes to fail. (Bug #42450)

Disk Data: Repeated insert and delete operations on disk-based tables could lead to failures in the NDB Tablespace Manager (TSMAN kernel block). (Bug #40344)

Disk Data: Trying to execute a CREATE LOGFILE GROUP statement using a value greater than 150M for UNDO_BUFFER_SIZE caused data nodes to crash.

As a result of this fix, the upper limit for UNDO_BUFFER_SIZE is now 600M; attempting to set a higher value now fails gracefully with an error. (Bug #34102)

References: See also Bug #36702.

Disk Data: Creating a Disk Data tablespace with a very large extent size caused the data nodes to fail. The issue was observed when using extent sizes of 100 MB and larger. (Bug #39096)

Disk Data: It was not possible to add an in-memory column online to a table that used a table-level or column-level STORAGE DISK option. The same issue prevented ALTER ONLINE TABLE ... REORGANIZE PARTITION from working on Disk Data tables. (Bug #42549)

Disk Data: Attempting to perform a system restart of the cluster where there existed a logfile group without and undo log files caused the data nodes to crash.

(Bug #17614)

Disk Data: Using a path or file name longer than 128 characters for Disk Data undo log files and tablespace data files caused a number of issues, including failures of CREATE LOGFILE GROUP, ALTER LOGFILE GROUP, CREATE TABLESPACE, and ALTER TABLESPACE statements, as well as crashes of management nodes and data nodes.

With this fix, the maximum length for path and file names used for Disk Data undo log files and tablespace data files is now the same as the maximum for the operating system. (Bug #31769, Bug #31770, Bug #31772)

Disk Data: When attempting to create a tablespace that already existed, the error message returned was Table or index with given name already exists. (Bug #32662)

Cluster Replication: Primary key updates on MyISAM and InnoDB tables failed to replicate to NDBCLUSTER tables. (Bug #42921)

Cluster Replication: Being disconnected from the cluster while setting up the binary log caused mysqld to hang or crash. (Bug #43045)

Cluster API: Some error messages from ndb_mgmd contained newline (\n) characters. This could break the MGM API protocol, which uses the newline as a line separator. (Bug #43104)

Cluster API: When using an ordered index scan without putting all key columns in the read mask, this invalid use of the NDB API went undetected, which resulted in the use of uninitialized memory. (Bug #42591)