MySQL Cluster NDB 7.2.14 is a new release of MySQL Cluster,
incorporating new features in the
NDBCLUSTER storage engine, and
fixing recently discovered bugs in previous MySQL Cluster NDB
7.2 development releases.
Obtaining MySQL Cluster NDB 7.2. MySQL Cluster NDB 7.2 source code and binaries can be obtained from http://dev.mysql.com/downloads/cluster/.
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 5.5 through MySQL 5.5.34 (see Changes in MySQL 5.5.34 (2013-09-20)).
Functionality Added or Changed
ExtraSendBufferMemory parameter for
management nodes and API nodes. (Formerly, this parameter was
available only for configuring data nodes.) See
(management nodes), and
(API nodes), for more information.
CMakeLists.txt files for
ndbmemcache wrote into the source tree,
preventing out-of-source builds.
ndbmemcache did not handle passed-in
BINARY values correctly.
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)
The MySQL Cluster installer for Windows provided a nonfunctional
option to install debug symbols (contained in
*.pdb files). This option has been removed
from the installer.
You can obtain the
*.pdb debug files
files for a given MySQL Cluster release from the Windows
.zip archive for the same release, such
(Bug #16748308, Bug #69112)
The MySQL Cluster Windows installer attempted to use the wrong
path to the
my.ini file and the executables
(Bug #13813120, Bug #64510)
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 #19691443)
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)
DBUTIL data node block is now less strict
about the order in which it receives certain messages from other
not work correctly with data nodes running
The Windows error ERROR_FILE_EXISTS was
not recognized by
treated it as an unknown error.
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
mysql_upgrade failed when upgrading from
MySQL Cluster NDB 7.1.26 to MySQL Cluster NDB 7.2.13 when it
attempted to invoke a stored procedure before the
mysql.proc table had been upgraded.
References: This bug is a regression of Bug #16226274.
The planned or unplanned shutdown of one or more data nodes
while reading table data from the
ndbinfo database caused a
DROP TABLE while
DBDIH was updating table checkpoint
information subsequent to a node failure could lead to a data
In certain cases, when starting a new SQL node, mysqld failed with Error 1427 Api node died, when SUB_START_REQ reached node. (Bug #16840741)
Failure to use container classes specific
NDB during node failure handling
could cause leakage of commit-ack markers, which could later
lead to resource shortages or additional node crashes.
Use of an uninitialized variable employed in connection with
error handling in the
DBLQH kernel block
could sometimes lead to a data node crash or other stability
issues for no apparent reason.
A race condition in the time between the reception of a
execNODE_FAILREP signal by the
QMGR kernel block and its reception by the
blocks could lead to data node crashes during shutdown.
The NDB Error-Reporting Utility
(ndb_error_reporter) failed to include the
cluster nodes' log files in the archive it produced when the
FILE option was set for the parameter
References: See also Bug #11752792, Bug #44082.
CLUSTERLOG command (see
Commands in the MySQL Cluster Management Client) caused
ndb_mgm to crash on Solaris SPARC systems.
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.
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)
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)
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)
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)
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.
Creating more than 32 hash maps caused data nodes to fail.
Usually new hashmaps are created only when performing
reorganzation after data nodes have been added or when explicit
partitioning is used, such as when creating a table with the
MAX_ROWS option, or using
BY KEY() PARTITIONS .
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)
When performing an
ON DUPLICATE KEY UPDATE on an
NDB table where the row to be
inserted already existed and was locked by another transaction,
the error message returned from the
following the timeout was Transaction already
aborted instead of the expected Lock wait
(Bug #14065831, Bug #65130)
CREATE LOGFILE GROUP failed with
a syntax error when
UNDO_BUFFER_SIZE, or both options were
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)
Formerly, the node used as the coordinator or leader for
distributed decision making between nodes (also known as 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)
START BACKUP WAIT STARTED was run from
the command line using ndb_mgm
the client did not exit until the backup completed.
(Bug #11752837, Bug #44146)
ndb_error-reporter did not support the
(Bug #11756666, Bug #48606)
References: See also Bug #11752792, Bug #44082.
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)
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)
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.
For each log event retrieved using the MGM API, the log event
simply cast to an
enum type, which resulted
in invalid category values. Now an offset is added to the
category following the cast to ensure that the value does not
fall out of the allowed range.
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.