This is a bugfix release, fixing recently discovered bugs in the previous MySQL Cluster NDB 6.3 release.
Obtaining MySQL Cluster NDB 6.3. The latest MySQL Cluster NDB 6.3 binaries for supported platforms can be obtained from http://dev.mysql.com/downloads/cluster/. Source code for the latest MySQL Cluster NDB 6.3 release can be obtained from the same location. You can also access the MySQL Cluster NDB 6.3 development source tree at https://code.launchpad.net/~mysql/mysql-server/mysql-5.1-telco-6.3.
This release 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
for ndb_restore. This option causes
ndb_restore to ignore tables corrupted due to
missing blob parts tables, and to continue reading from the
backup file and restoring the remaining tables.
References: See also Bug #51652.
Two related problems could occur with read-committed scans made in parallel with transactions combining multiple (concurrent) operations:
When committing a multiple-operation transaction that contained concurrent insert and update operations on the same record, the commit arrived first for the insert and then for the update. If a read-committed scan arrived between these operations, it could thus read incorrect data; in addition, if the scan read variable-size data, it could cause the data node to fail.
When rolling back a multiple-operation transaction having concurrent delete and insert operations on the same record, the abort arrived first for the delete operation, and then for the insert. If a read-committed scan arrived between the delete and the insert, it could incorrectly assume that the record should not be returned (in other words, the scan treated the insert as though it had not yet been committed).
A row insert or update followed by a delete operation on the same row within the same transaction could in some cases lead to a buffer overflow. (Bug #59242)
References: See also Bug #56524. This bug was introduced by Bug #35208.
FAIL_REP signal, used inside the NDB
kernel to declare that a node has failed, now includes the node
ID of the node that detected the failure. This information can
be useful in debugging.
EXPLAIN EXTENDED for a
query that would use condition pushdown could cause
mysqld to crash.
(Bug #58553, Bug #11765570)
In some circumstances, an SQL trigger on an
NDB table could read stale data.
During a node takeover, it was possible in some circumstances
for one of the remaining nodes to send an extra transaction
LQH_TRANSCONF) signal to the
DBTC kernel block, conceivably leading to a
crash of the data node trying to take over as the new
A query having multiple predicates joined by
OR in the
WHERE clause and
which used the
sort_union access method (as
EXPLAIN) could return
Trying to drop an index while it was being used to perform scan updates caused data nodes to crash. (Bug #58277, Bug #57057)
When handling failures of multiple data nodes, an error in the construction of internal signals could cause the cluster's remaining nodes to crash. This issue was most likely to affect clusters with large numbers of data nodes. (Bug #58240)
The number of rows affected by a statement that used a
WHERE clause having an
IN condition with a value list
containing a great many elements, and that deleted or updated
enough rows such that
them in batches, was not computed or reported correctly.
A query using
BETWEEN as part of a
WHERE condition could cause
mysqld to hang or crash.
In some circumstances, it was possible for
mysqld to begin a new multi-range read scan
without having closed a previous one. This could lead to
exhaustion of all scan operation objects, transaction objects,
or lock objects (or some combination of these) in
NDB, causing queries to fail with
such errors as Lock wait timeout exceeded
or Connect failure - out of connection
References: See also Bug #58750.
a table with a unique index created with
returned an empty result.
enabled, a query using
LIKE on an
ENUM column of an
NDB table failed to return any
results. This issue is resolved by disabling
performing such queries.
When a slash character (
/) was used as part
of the name of an index on an
table, attempting to execute a
TABLE statement on the table failed with the error
Index not found, and the table was
In certain cases, a race condition could occur when
DROP LOGFILE GROUP removed the
logfile group while a read or write of one of the effected files
was in progress, which in turn could lead to a crash of the data
A race condition could sometimes be created when
DROP TABLESPACE was run
concurrently with a local checkpoint; this could in turn lead to
a crash of the data node.
Disk Data: Performing what should have been an online drop of a multi-column index was actually performed offline. (Bug #55618)
When at least one data node was not running, queries against the
INFORMATION_SCHEMA.FILES table took
an excessive length of time to complete because the MySQL server
waited for responses from any stopped nodes to time out. Now, in
such cases, MySQL does not attempt to contact nodes which are
not known to be running.
Attempting to read the same value (using
than 9000 times within the same transaction caused the
transaction to hang when executed. Now when more reads are
performed in this way than can be accommodated in a single
transaction, the call to
with a suitable error.