This release incorporates new features in the
NDB storage engine and fixes
recently discovered bugs in MySQL Cluster NDB 7.0.19.
A critical upgrade issue was discovered in MySQL Cluster NDB 7.0.20 shortly after release, causing it to be withdrawn and replaced with MySQL Cluster NDB 7.0.20a, which contains a fix for this issue. MySQL Cluster NDB 7.0.20a is otherwise identical to MySQL Cluster 7.0.20.
See the section called “Changes in MySQL Cluster NDB 7.0.20a (5.1.51-ndb-7.0.20a) (2010-11-18)”, for more information.
Obtaining MySQL Cluster NDB 7.0. The latest MySQL Cluster NDB 7.0 binaries for supported platforms can be obtained from http://dev.mysql.com/downloads/cluster/. Source code for the latest MySQL Cluster NDB 7.0 release can be obtained from the same location. You can also access the MySQL Cluster NDB 7.0 development source tree at https://code.launchpad.net/~mysql/mysql-server/mysql-cluster-7.0.
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 5.1 through MySQL 5.1.51 (see Changes in MySQL 5.1.51 (2010-09-10)).
Please refer to our bug database at http://bugs.mysql.com/ for more details about the individual bugs fixed in this version.
Functionality Added or Changed
ndbd now bypasses use of Non-Uniform Memory
Access support on Linux hosts by default. If your system
supports NUMA, you can enable it and override
ndbd use of interleaving by setting the
Numa data node
configuration parameter which is added in this release. See
Data Nodes: Realtime Performance Parameters, for more
Id configuration parameter used with
MySQL Cluster management, data, and API nodes (including SQL
nodes) is now deprecated, and the
parameter (long available as a synonym for
when configuring these types of nodes) should be used instead.
Id continues to be supported for reasons of
backward compatibility, but now generates a warning when used
with these types of nodes, and is subject to removal in a future
release of MySQL Cluster.
This change affects the name of the configuration parameter
only, establishing a clear preference for
Id in the
sections of the MySQL Cluster global configuration
config.ini) file. The behavior of unique
identifiers for management, data, and SQL and API nodes in MySQL
Cluster has not otherwise been altered.
Id parameter as used in the
[computer] section of the MySQL Cluster
global configuration file is not affected by this change.
MySQL Cluster RPM distributions did not include a
shared-compat RPM for the MySQL Server, which
meant that MySQL applications depending on
libmysqlclient.so.15 (MySQL 5.0 and
earlier) no longer worked.
On Windows, the angel process which monitors and (when necessary) restarts the data node process failed to spawn a new worker in some circumstances where the arguments vector contained extra items placed at its beginning. This could occur when the path to ndbd.exe or ndbmtd.exe contained one or more spaces. (Bug #57949)
The disconnection of an API or management node due to missed heartbeats led to a race condition which could cause data nodes to crash. (Bug #57946)
The method for calculating table schema versions used by schema
transactions did not follow the established rules for recording
schemas used in the
References: See also Bug #57896.
LQHKEYREQ request message used by the
local query handler when checking the major schema version of a
table, being only 16 bits wide, could cause this check to fail
with an Invalid schema version error
NDB error code 1227). This issue
occurred after creating and dropping (and re-creating) the same
table 65537 times, then trying to insert rows into the table.
References: See also Bug #57897.
Transient errors during a local checkpoint were not retried, leading to a crash of the data node. Now when such errors occur, they are retried up to 10 times if necessary. (Bug #57650)
When a data node angel process failed to fork off a new worker
process (to replace one that had failed), the failure was not
handled. This meant that the angel process either transformed
itself into a worker process, or itself failed. In the first
case, the data node continued to run, but there was no longer
any angel to restart it in the event of failure, even with
StopOnError set to 0.
Trying to use the same column more than once in the partitioning
key when partitioning a table by
mysqld to crash. Such duplication of key
columns is now expressly disallowed, and fails with an
(Bug #53354, Bug #57924)
Data nodes compiled with gcc 4.5 or higher crashed during startup. (Bug #57761)
WHERE against an
NDB table having a
VARCHAR column as its primary key
failed to return all matching rows.
ndb_restore now retries failed transactions when replaying log entries, just as it does when restoring data. (Bug #57618)
SUMA kernel block has a 10-element ring
buffer for storing out-of-order
SUB_GCP_COMPLETE_REP signals received from
the local query handlers when global checkpoints are completed.
In some cases, exceeding the ring buffer capacity on all nodes
of a node group at the same time caused the node group to fail
with an assertion.
During a GCP takeover, it was possible for one of the data nodes
not to receive a
with the result that it would report itself as
GCP_COMMITTING while the other data nodes
A GCP stop is detected using 2 parameters which determine the
maximum time that a global checkpoint or epoch can go unchanged;
one of these controls this timeout for GCPs and one controls the
timeout for epochs. Suppose the cluster is configured such that
is 100 ms but
1500 ms. A node failure can be signalled after 4 missed
heartbeats—in this case, 6000 ms. However, this would
causing false detection of a GCP. To prevent this from
happening, the configured value for
is automatically adjusted, based on the values of
The current issue arose when the automatic adjustment routine
did not correctly take into consideration the fact that, during
cascading node-failures, several intervals of length
* (HeartbeatIntervalDBDB + ArbitrationTimeout) may
elapse before all node failures have internally been resolved.
This could cause false GCP detection in the event of a cascading
of the form
when selecting from
NDB table having a primary key
on multiple columns could result in Error 4259
Invalid set of range scan bounds if
range2 started exactly where
range1 ended and the primary key
definition declared the columns in a different order relative to
the order in the table's column list. (Such a query should
simply return all rows in the table, since any expression
is always true.)
CREATE TABLE t (a, b, PRIMARY KEY (b, a)) ENGINE NDB;
This issue could then be triggered by a query such as this one:
SELECT * FROM t WHERE b < 8 OR b >= 8;
In addition, the order of the ranges in the
WHERE clause was significant; the issue was
not triggered, for example, by the query
SELECT * FROM t WHERE b
<= 8 OR b > 8.
A number of cluster log warning messages relating to deprecated configuration parameters contained spelling, formatting, and other errors. (Bug #57381)
MAX_ROWS option for
CREATE TABLE was ignored, which
meant that it was not possible to enable multi-threaded building
Aborting a native
NDB backup in the
ndb_mgm client using the
BACKUP command did not work correctly when using
ndbmtd, in some cases leading to a crash of
CREATE NODEGROUP and
NODEGROUP commands could cause
mysqld processes to crash.
Disk Data: When performing online DDL on Disk Data tables, scans and moving of the relevant tuples were done in more or less random order. This fix causes these scans to be done in the order of the tuples, which should improve performance of such operations due to the more sequential ordering of the scans. (Bug #57848)
References: See also Bug #57827.
ENUM columns represented using
more than 1 byte (that is,
columns with more than 8 members and
ENUM columns with more than 256
constants) between platforms using different endianness failed
when using the row-based format. This was because columns of
these types are represented internally using integers, but the
internal functions used by MySQL to handle them treated them as
References: See also Bug #53528.
OPTION_ALLOW_BATCHING bitmask had the
same value as
OPTION_PROFILING. This caused
conflicts between using
An application dropping a table at the same time that another
application tried to set up a replication event on the same
table could lead to a crash of the data node. The same issue
could sometimes cause
An NDB API client program under load could abort with an
assertion error in
References: See also Bug #32708.