MySQL NDB Cluster 7.3.12 is a new release of NDB 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 NDB Cluster
Obtaining MySQL NDB Cluster 7.3. MySQL NDB Cluster 7.3 source code and binaries can be obtained from https://dev.mysql.com/downloads/cluster/.
For an overview of changes made in MySQL NDB Cluster 7.3, see What is New in NDB Cluster 7.3.
This release also incorporates all bug fixes and changes made in previous NDB Cluster releases, as well as all bug fixes and feature changes which were added in mainline MySQL 5.6 through MySQL 5.6.28 (see Changes in MySQL 5.6.28 (2015-12-07, General Availability)).
Important Change: A fix made in MySQL NDB Cluster 7.3.11 and MySQL NDB Cluster 7.4.8 caused ndb_restore to perform unique key checks even when operating in modes which do not restore data, such as when using the program's
That change in behavior caused existing valid backup routines to fail; to keep this issue from affecting this and future releases, the previous fix has been reverted. This means that the requirement added in those versions that ndb_restore be run
--rebuild-indexeswhen used on tables containing unique indexes is also lifted. (Bug #22345748)
References: See also: Bug #22329365. Reverted patches: Bug #57782, Bug #11764893.
Important Note: If an
NDBtable having a foreign key was dropped while one of the data nodes was stopped, the data node later failed when trying to restart. (Bug #18554390)
NDB Replication: While the binary log injector thread was handling failure events, it was possible for all
NDBtables to be left indefinitely in read-only mode. This was due to a race condition between the binary log injector thread and the utility thread handling events on the ndb_schema table, and to the fact that, when handling failure events, the binary log injector thread places all
NDBtables in read-only mode until all such events are handled and the thread restarts itself.
When the binary log inject thread receives a group of one or more failure events, it drops all other existing event operations and expects no more events from the utility thread until it has handled all of the failure events and then restarted itself. However, it was possible for the utility thread to continue attempting binary log setup while the injector thread was handling failures and thus attempting to create the schema distribution tables as well as event subscriptions on these tables. If the creation of these tables and event subscriptions occurred during this time, the binary log injector thread's expectation that there were no further event operations was never met; thus, the injector thread never restarted, and
NDBtables remained in read-only as described previously.
To fix this problem, the
Ndbobject that handles schema events is now definitely dropped once the
ndb_schematable drop event is handled, so that the utility thread cannot create any new events until after the injector thread has restarted, at which time, a new
Ndbobject for handling schema events is created. (Bug #17674771, Bug #19537961, Bug #22204186, Bug #22361695)
NDB Cluster APIs: The binary log injector did not work correctly with
TE_INCONSISTENTevent type handling by
Ndb::nextEvent(). (Bug #22135541)
References: See also: Bug #20646496.
NDB Cluster APIs:
pollEvents2()were slow to receive events, being dependent on other client threads or blocks to perform polling of transporters on their behalf. This fix allows a client thread to perform its own transporter polling when it has to wait in either of these methods.
Introduction of transporter polling also revealed a problem with missing mutex protection in the
ndbcluster_binloghandler, which has been added as part of this fix. (Bug #79311, Bug #20957068, Bug #22224571)
In debug builds, a
WAIT_EVENTwhile polling caused excessive logging to stdout. (Bug #22203672)
When executing a schema operation such as
CREATE TABLEon a MySQL NDB Cluster with multiple SQL nodes, it was possible for the SQL node on which the operation was performed to time out while waiting for an acknowledgement from the others. This could occur when different SQL nodes had different settings for
--ndb-log-update-as-write, or other mysqld options effecting binary logging by
This happened due to the fact that, in order to distribute schema changes between them, all SQL nodes subscribe to changes in the
ndb_schemasystem table, and that all SQL nodes are made aware of each others subscriptions by subscribing to
TE_UNSUBSCRIBEevents. The names of events to subscribe to are constructed from the table names, adding
REPLF$as a prefix.
REPLF$is used when full binary logging is specified for the table. The issue described previously arose because different values for the options mentioned could lead to different events being subscribed to by different SQL nodes, meaning that all SQL nodes were not necessarily aware of each other, so that the code that handled waiting for schema distribution to complete did not work as designed.
To fix this issue, MySQL NDB Cluster now treats the
ndb_schematable as a special case and enforces full binary logging at all times for this table, independent of any settings for mysqld binary logging options. (Bug #22174287, Bug #79188)
Attempting to create an
NDBtable having greater than the maximum supported combined width for all
BITcolumns (4096) caused data node failure when these columns were defined with
COLUMN_FORMAT DYNAMIC. (Bug #21889267)
Creating a table with the maxmimum supported number of columns (512) all using
COLUMN_FORMAT DYNAMICled to data node failures. (Bug #21863798)
STOP -fto force a node shutdown even when it triggered a complete shutdown of the cluster, it was possible to lose data when a sufficient number of nodes were shut down, triggering a cluster shutodwn, and the timing was such that
SUMAhandovers had been made to nodes already in the process of shutting down. (Bug #17772138)
NdbEventBuffer::set_total_buckets()method calculated the number of remaining buckets incorrectly. This caused any incomplete epoch to be prematurely completed when the
SUB_START_CONFsignal arrived out of order. Any events belonging to this epoch arriving later were then ignored, and so effectively lost, which resulted in schema changes not being distributed correctly among SQL nodes. (Bug #79635, Bug #22363510)
Compilation of MySQL NDB Cluster failed on SUSE Linux Enterprise Server 12. (Bug #79429, Bug #22292329)
Schema events were appended to the binary log out of order relative to non-schema events. This was caused by the fact that the binary log injector did not properly handle the case where schema events and non-schema events were from different epochs.
This fix modifies the handling of events from the two schema and non-schema event streams such that events are now always handled one epoch at a time, starting with events from the oldest available epoch, without regard to the event stream in which they occur. (Bug #79077, Bug #22135584, Bug #20456664)
NDBfailed during a node restart due to the status of the current local checkpoint being set but not as active, even though it could have other states under such conditions. (Bug #78780, Bug #21973758)
The value set for
ThreadConfigparameter was not calculated correctly, causing the spin to continue for longer than actually specified. (Bug #78525, Bug #21886476)