MySQL Cluster NDB 7.3.3 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
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.
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 5.6.14 (see Changes in MySQL 5.6.14 (2013-09-20)).
Functionality Added or Changed
The length of time a management node waits for a heartbeat
message from another management node is now configurable using
management node configuration parameter added in this release.
The connection is considered dead after 3 missed heartbeats. The
default value is 1500 milliseconds, or a timeout of
approximately 6000 ms.
(Bug #17807768, Bug #16426805)
The MySQL Cluster Auto-Installer now generates a
my.cnf file for each
mysqld in the cluster before starting it. For
more information, see
Using the MySQL Cluster Auto-Installer.
Performance: In a number of cases found in various locations in the MySQL Cluster codebase, unnecessary iterations were performed; this was caused by failing to break out of a repeating control structure after a test condition had been met. This community-contributed fix removes the unneeded repetitions by supplying the missing breaks. (Bug #16904243, Bug #69392, Bug #16904338, Bug #69394, Bug #16778417, Bug #69171, Bug #16778494, Bug #69172, Bug #16798410, Bug #69207, Bug #16801489, Bug #69215, Bug #16904266, Bug #69393)
Portions of the documentation specific to MySQL Cluster and the
NDB storage engine were not
included when installing from RPMs.
ndb_restore could abort during the last stages of a restore using attribute promotion or demotion into an existing table. This could happen if a converted attribute was nullable and the backup had been run on active database. (Bug #17275798)
It was not possible to start MySQL Cluster processes created by the Auto-Installer on a Windows host running freeSSHd. (Bug #17269626)
DBUTIL data node block is now less strict
about the order in which it receives certain messages from other
ONLINE TABLE ... REORGANIZE PARTITION failed when run
against a table having or using a reference to a foreign key.
(Bug #17036744, Bug #69619)
TUPKEYREQ signals are used to read data from
the tuple manager block (
DBTUP), and are used
for all types of data access, especially for scans which read
many rows. A TUPKEYREQ specifies a series of 'columns' to be
read, which can be either single columns in a specific table, or
pseudocolumns, two of which—
READ_PACKED—are aliases to read all
columns in a table, or some subset of these columns.
Pseudocolumns are used by modern NDB API applications as they
require less space in the
specify columns to be read, and can return the data in a more
compact (packed) format.
This fix moves the creation and initialization of on-stack
Signal objects to only those pseudocolumn reads which need to
EXECUTE_DIRECT to other block instances,
rather than for every read. In addition, the size of an on-stack
signal is now varied to suit the requirements of each
pseudocolumn, so that only reads of the
INDEX_STAT pseudocolumn now require
initialization (and 3KB memory each time this is performed).
A race condition could sometimes occur when trying to lock receive threads to cores. (Bug #17009393)
Results from joins using a
WHERE with an
ORDER BY ... DESC clause were not sorted
DESC keyword in such cases was
(Bug #16999886, Bug #69528)
The Windows error ERROR_FILE_EXISTS was
not recognized by
treated it as an unknown error.
not work correctly with data nodes running
File system errors occurring during a local checkpoint could sometimes cause an LCP to hang with no obvious cause when they were not handled correctly. Now in such cases, such errors always cause the node to fail. Note that the LQH block always shuts down the node when a local checkpoint fails; the change here is to make likely node failure occur more quickly and to make the original file system error more visible. (Bug #16961443)
Maintenance and checking of parent batch completion in the
SPJ block of the
kernel was reimplemented. Among other improvements, the
completion state of all ancestor nodes in the tree are now
Dropping a column, which was not itself a foreign key, from an
NDB table having foreign keys
failed with ER_TABLE_DEF_CHANGED.
The LCP fragment scan watchdog periodically checks for lack of
progress in a fragment scan performed as part of a local
checkpoint, and shuts down the node if there is no progress
after a given amount of time has elapsed. This interval,
formerly hard-coded as 60 seconds, can now be configured using
data node configuration parameter added in this release.
This configuration parameter sets the maximum time the local checkpoint can be stalled before the LCP fragment scan watchdog shuts down the node. The default is 60 seconds, which provides backward compatibility with previous releases.
You can disable the LCP fragment scan watchdog by setting this parameter to 0. (Bug #16630410)
Added the ndb_error_reporter options
which makes it possible to set a timeout for connecting to
which disables scp connections to remote hosts, and
which skips all nodes in a given node group.
References: See also Bug #11752792, Bug #44082.
id WAIT STARTED
id had already been used for a backup
ID, an error caused by the duplicate ID occurred as expected,
but following this, the
START BACKUP command
(Bug #16593604, Bug #68854)
ndb_mgm treated backup IDs provided to
ABORT BACKUP commands as signed values, so
that backup IDs greater than 231
wrapped around to negative values. This issue also affected
out-of-range backup IDs, which wrapped around to negative values
instead of causing errors as expected in such cases. The backup
ID is now treated as an unsigned value, and
ndb_mgm now performs proper range checking
for backup ID values greater than
(Bug #16585497, Bug #68798)
When trying to specify a backup ID greater than the maximum allowed, the value was silently truncated. (Bug #16585455, Bug #68796)
The unexpected shutdown of another data node as a starting data node received its node ID caused the latter to hang in Start Phase 1. (Bug #16007980)
References: See also Bug #18993037.
NDB receive thread waited unnecessarily
for additional job buffers to become available when receiving
data. This caused the receive mutex to be held during this wait,
which could result in a busy wait when the receive thread was
running with real-time priority.
This fix also handles the case where a negative return value
from the initial check of the job buffer by the receive thread
prevented further execution of data reception, which could
possibly lead to communication blockage or configured
When the available job buffers for a given thread fell below the critical threshold, the internal multi-threading job scheduler waited for job buffers for incoming rather than outgoing signals to become available, which meant that the scheduler waited the maximum timeout (1 millisecond) before resuming execution. (Bug #15907122)
to 1 or 2 on Windows systems caused
ALTER TABLE ... ADD
FOREIGN KEY statements against tables with names
containing uppercase letters to fail with Error 155,
No such table: '(null)'.
(Bug #14826778, Bug #67354)
Under some circumstances, a race occurred where the wrong
watchdog state could be reported. A new state name
Packing Send Buffers is added for watchdog
state number 11, previously reported as
place. As part of this fix, the state numbers for
states without names are always now reported in such cases.
When a node fails, the Distribution Handler
DBDIH kernel block) takes steps together
with the Transaction Coordinator (
make sure that all ongoing transactions involving the failed
node are taken over by a surviving node and either committed or
aborted. Transactions taken over which are then committed belong
in the epoch that is current at the time the node failure
occurs, so the surviving nodes must keep this epoch available
until the transaction takeover is complete. This is needed to
maintain ordering between epochs.
A problem was encountered in the mechanism intended to keep the current epoch open which led to a race condition between this mechanism and that normally used to declare the end of an epoch. This could cause the current epoch to be closed prematurely, leading to failure of one or more surviving data nodes. (Bug #14623333, Bug #16990394)
under heavy load could cause data nodes running
ndbmtd to fail.
When using dynamic listening ports for accepting connections from API nodes, the port numbers were reported to the management server serially. This required a round trip for each API node, causing the time required for data nodes to connect to the management server to grow linearly with the number of API nodes. To correct this problem, each data node now reports all dynamic ports at once. (Bug #12593774)
ndb_error-reporter did not support the
(Bug #11756666, Bug #48606)
References: See also Bug #11752792, Bug #44082.
Formerly, the node used as the coordinator or leader for
distributed decision making between nodes (also known as the
The DBDICT Block) was
indicated in the output of the ndb_mgm client
SHOW command as the “master”
node, although this node has no relationship to a master server
in MySQL Replication. (It should also be noted that it is not
necessary to know which node is the leader except when debugging
NDBCLUSTER source code.) To avoid possible
confusion, this label has been removed, and the leader node is
now indicated in
SHOW command output using an
(Bug #11746263, Bug #24880)
Program execution failed to break out of a loop after meeting a desired condition in a number of internal methods, performing unneeded work in all cases where this occurred. (Bug #69610, Bug #69611, Bug #69736, Bug #17030606, Bug #17030614, Bug #17160263)
ABORT BACKUP in the
ndb_mgm client (see
Commands in the MySQL Cluster Management Client) took an
excessive amount of time to return (approximately as long as the
backup would have required to complete, had it not been
aborted), and failed to remove the files that had been generated
by the aborted backup.
(Bug #68853, Bug #17719439)
Note that converted character data is not checked to conform to any character set.
When performing such promotions, the only other sort of type conversion that can be performed at the same time is between character types and binary types.
Trying to use a stale
.frm file and
encountering a mismatch bewteen table definitions could cause
mysqld to make errors when writing to the
Replaying a binary log that had been written by a
mysqld from a MySQL Server distribution (and
from not a MySQL Cluster distribution), and that contained DML
statements, on a MySQL Cluster SQL node could lead to failure of
the SQL node.
now supports a pointer or a reference to table as its required
argument. If a null table pointer is used, the method now
returns -1 to make it clear that this is what has occurred.
When attempting to start memcached with a
cache_size larger than that of the available
memory and with
preallocate=true failed, the
error message provided only a numeric code, and did not indicate
what the actual source of the error was.
(Bug #17509293, Bug #70403)
CMakeLists.txt files for
ndbmemcache wrote into the source tree,
preventing out-of-source builds.
ndbmemcache did not handle passed-in
BINARY values correctly.