[This is part 2 of the announcement]
* When performing online reorganization of tables, unique
indexes were not included in the reorganization. (Bug #13714258)
* Local reads of unique index and blob tables did not work
correctly for fully replicated tables using more than one node
group. (Bug #83016, Bug #24675602)
* The effects of an ALTER TABLE
(http://dev.mysql.com/doc/refman/5.7/en/alter-table.html)
statement changing a table to use READ_BACKUP were not preserved
after a restart of the cluster. (Bug #82812, Bug #24570439)
* Using FOR_RP_BY_NODE or FOR_RP_BY_LDM for
PARTITION_BALANCE did not work with fully replicated tables. (Bug
#82801, Bug #24565265)
* Changes to READ_BACKUP settings were not propagated to
internal blob tables. (Bug #82788, Bug #24558232)
* The count displayed by the c_exec column in the
ndbinfo.threadstat
(http://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbinfo-threadstat.html)
table was incomplete. (Bug #82635, Bug #24482218)
* The default PARTITION_BALANCE setting for NDB
(http://dev.mysql.com/doc/refman/5.7/en/mysql-cluster.html)
tables created with READ_BACKUP=1 (see Setting NDB_TABLE options
in table comments
(http://dev.mysql.com/doc/refman/5.7/en/create-table-ndb-table-comment-options.html))
has been changed from FOR_RA_BY_LDM
to FOR_RP_BY_LDM. (Bug #82634, Bug #24482114)
* The internal function ndbcluster_binlog_wait(), which
provides a way to make sure that all events originating from a
given thread arrive in the binary log, is used by SHOW BINLOG
EVENTS (http://dev.mysql.com/doc/refman/5.7/en/show-binlog-events.html)
as well as when resetting the binary log. This function
waits on an injector condition while the latest global epoch
handled by NDB is more recent than the epoch last committed in
this session, which implies that this condition must be signalled
whenever the binary log thread completes and updates a new latest
global epoch. Inspection of the code revealed that this
condition signalling was missing, and that, instead of being
awakened whenever a new latest global epoch completes (~100ms),
client threads waited for the maximum timeout (1 second). This
fix adds the missing injector condition signalling, while also
changing it to a condition broadcast to make sure that all client
threads are alerted. (Bug #82630, Bug #24481551)
* Fully replicated internal foreign key or unique index
triggers could fire multiple times, which led to aborted
transactions for an insert or a delete operation. This happened
due to redundant deferred constraint triggers firing during
pre-commit. Now in such cases, we ensure that only triggers
specific to unique indexes are fired in this stage. (Bug #82570,
Bug #24454378)
* Backups potentially could fail when using fully
replicated tables due to their high usage (and subsequent
exhaustion) of internal trigger resources. To compensate for
this, the amount of memory reserved in the NDB kernel for
internal triggers has been increased, and is now based in part on
the maximum number of tables. (Bug #82569, Bug #24454262)
References: See also: Bug #23539733.
* In the DBTC function executeFullyReplicatedTrigger() in
the NDB kernel, an incorrect check of state led in some cases to
failure handling when no failure had actually occurred. (Bug
#82568, Bug #24454093) References: See also: Bug #23539733.
* When returning from LQHKEYREQ with failure in LQHKEYREF
in an internal trigger operation, no check was made as to whether
the trigger was fully replicated, so that those triggers that
were fully replicated were never handled. (Bug #82566, Bug
#24453949) References: See also: Bug #23539733.
* When READ_BACKUP had not previously been set, then was
set to 1 as part of an ALTER TABLE ... ALGORITHM=INPLACE
(http://dev.mysql.com/doc/refman/5.7/en/alter-table-partition-operations.html)
statement, the change was not propagated to
internal unique index tables or BLOB
(http://dev.mysql.com/doc/refman/5.7/en/blob.html) tables. (Bug
#82491, Bug #24424459)
* Distribution of MySQL privileges was incomplete due to
the failure of the mysql_cluster_move_privileges() procedure to
convert the mysql.proxies_priv table to NDB. The root cause of
this was an ALTER TABLE ... ENGINE NDB
(http://dev.mysql.com/doc/refman/5.7/en/alter-table.html)
statement which sometimes failed when this table contained
illegal TIMESTAMP
(http://dev.mysql.com/doc/refman/5.7/en/datetime.html) values.
(Bug #82464, Bug #24430209)
* The internal variable m_max_warning_level was not
initialized in storage/ndb/src/kernel/blocks/thrman.cpp. This
sometimes led to node failures during a restart when the
uninitialized value was treated as 0. (Bug #82053, Bug #23717703)
* Usually, when performing a system restart, all nodes are
restored from redo logs and local checkpoints (LCPs), but in some
cases some node might require a copy phase before it is finished
with the system restart. When this happens, the node in question
waits for all other nodes to start up completely before
performing the copy phase. Notwithstanding the fact that it is
thus possible to begin a local checkpoint before reaching start
phase 4 in the DBDIH block, LCP status was initialized to IDLE in
all cases, which could lead to a node failure. Now, when
performing this variant of a system restart, the LCP status is no
longer initialized. (Bug #82050, Bug #23717479)
* After adding a new node group online and executing ALTER
TABLE ... ALGORITHM=INPLACE REORGANIZE PARTITION
(http://dev.mysql.com/doc/refman/5.7/en/alter-table-partition-operations.html),
partition IDs were not set correctly for
new fragments. In a related change done as part of fixing this
issue, ndb_desc -p
(http://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-desc.html#option_ndb_desc_extra-partition-info)
now displays rows relating to partitions in order of partition ID.
(Bug #82037, Bug #23710999)
* When executing STOP BACKUP it is possible sometimes that
a few bytes are written to the backup data file before the backup
process actually terminates. When using ODIRECT
(http://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbd-definition.html#ndbparam-ndbd-odirect),
this resulted in the wrong error code being returned. Now in such cases,
nothing is written to O_DIRECT files unless the alignment is correct.
(Bug #82017, Bug #23701911)
* When transaction coordinator (TC) connection records were
used up, it was possible to handle scans only for local
checkpoints and backups, so that operations coming from the
DBUTIL block---used for ALTER TABLE ... REORGANIZE PARTITION
(http://dev.mysql.com/doc/refman/5.7/en/alter-table-partition-operations.html)
and other operations that reorganize
metadata---were unnecessarily blocked. In addition, such
operations were not always retried when TC records were
exhausted. To fix this issue, a number of operation records are
now earmarked for DBUTIL usage, as well as for LCP and backup
usage so that these operations are also not negatively impacted
by operations coming from DBUTIL. For more information, see The
DBUTIL Block
(http://dev.mysql.com/doc/ndbapi/en/ndb-internals-kernel-blocks-dbutil.html).
(Bug #81992, Bug #23642198)
* Operations performing multiple updates of the same row
within the same transaction could sometimes lead to corruption of
lengths of page entries. (Bug #81938, Bug #23619031)
* During a node restart, a fragment can be restored using
information obtained from local checkpoints (LCPs); up to 2
restorable LCPs are retained at any given time. When an LCP is
reported to the DIH kernel block as completed, but the node fails
before the last global checkpoint index written into this LCP has
actually completed, the latest LCP is not restorable. Although it
should be possible to use the older LCP, it was instead assumed
that no LCP existed for the fragment, which slowed the restart
process. Now in such cases, the older, restorable LCP is used,
which should help decrease long node restart times. (Bug #81894,
Bug #23602217)
* Optimized node selection (ndb_optimized_node_selection
(http://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-options-variables.html#sysvar_ndb_optimized_node_selection)
setting)
was not respected by ndb_data_node_neighbour
(http://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-options-variables.html#sysvar_ndb_data_node_neighbour)
when this was enabled. (Bug #81778, Bug #23555834)
* NDB no longer retries a global schema lock if this has
failed due to a timeout (default 3000ms) and there is the
potential for this lock request to participate in a metadata
lock-global schema lock deadlock. Now in such cases it selects
itself as a "victim", and returns the decision to the requestor
of the metadata lock, which then handles the request as a failed
lock request (preferable to remaining deadlocked indefinitely),
or, where a deadlock handler exists, retries the metadata
lock-global schema lock. (Bug #81775, Bug #23553267)
* Two issues were found in the implementation of hash
maps---used by NDB for mapping a table row's hash value to a
partition---for fully replicated tables:
1. Hash maps were selected based on the number of fragments
rather than the number of partitions. This was previously
undetected due to the fact that, for other kinds of tables,
these values are always the same.
2. The hash map was employed as a partition-to-partition map,
using the table row's hash value modulus the partition count as
input. This fix addresses both of the problems just described.
(Bug #81757, Bug #23544220) References: See also: Bug #81761,
Bug #23547525, Bug #23553996.
* Using mysqld together with --initialize
(http://dev.mysql.com/doc/refman/5.7/en/server-options.html#option_mysqld_initialize)
and --ndbcluster
(http://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-options-variables.html#option_mysqld_ndbcluster)
led to problems
later when attempting to use mysql_upgrade. When running with
--initialize, the server does not require NDB
(http://dev.mysql.com/doc/refman/5.7/en/mysql-cluster.html)
support, and having it enabled can lead to issues with ndbinfo
(http://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbinfo.html)
tables. To prevent this from happening, using the
--initialize option now causes mysqld to ignore the --ndbcluster
option if the latter is also specified. This issue affects
upgrades from MySQL Cluster NDB 7.5.3 or 7.5.3 only. In cases
where such upgrades fail for the reasons outlined previously, you
can work around the issue by deleting all .frm files in the
data/ndbinfo directory following a rolling restart of the entire
cluster, then running mysql_upgrade. (Bug #81689, Bug #23518923)
References: See also: Bug #82724, Bug #24521927.
* While a mysqld was waiting to connect to the management
server during initialization of the NDB handler, it was not
possible to shut down the mysqld. If the mysqld was not able to
make the connection, it could become stuck at this point. This
was due to an internal wait condition in the utility and index
statistics threads that could go unmet indefinitely. This
condition has been augmented with a maximum timeout of 1 second,
which makes it more likely that these threads terminate
themselves properly in such cases. In addition, the connection
thread waiting for the management server connection performed 2
sleeps in the case just described, instead of 1 sleep, as
intended. (Bug #81585, Bug #23343673)
* ALTER TABLE ... ALGORITHM=INPLACE
(http://dev.mysql.com/doc/refman/5.7/en/alter-table-partition-operations.html)
on a fully replicated table did not copy
the associated trigger ID, leading to a failure in the DBDICT
kernel block. (Bug #81544, Bug #23330359)
* The list of deferred tree node lookup requests created
when preparing to abort a DBSPJ request were not cleared when
this was complete, which could lead to deferred operations being
started even after the DBSPJ request aborted. (Bug #81355, Bug
#23251423) References: See also: Bug #23048816.
* Error and abort handling in Dbspj::execTRANSID_AI() was
implemented such that its abort() method was called before
processing of the incoming signal was complete. Since this
method sends signals to the LDM, this partly overwrote the
contents of the signal which was later required by
execTRANSID_AI(). This could result in aborted DBSPJ requests
cleaning up their allocated resources too early, or not at all.
(Bug #81353, Bug #23251145) References: See also: Bug #23048816.
* The read backup feature added in MySQL Cluster NDB 7.5.2
that makes it possible to read from backup replicas was not used
for reads with lock, or for reads of BLOB
(http://dev.mysql.com/doc/refman/5.7/en/blob.html) tables or
unique key tables where locks were upgraded to reads with lock.
Now the TCKEYREQ and SCAN_TABREQ signals use a flag to convey
information about such locks making it possible to read from a
backup replica when a read lock was upgraded due to being the
read of the base table for a BLOB table, or due to being the read
for a unique key. (Bug #80861, Bug #23001841)
* Primary replicas of partitioned tables were not
distributed evenly among node groups and local data managers. As
part of the fix for this issue, the maximum number of node groups
supported for a single MySQL Cluster, which was previously not
determined, is now set at 48 (MAX_NDB_NODE_GROUPS). (Bug #80845,
Bug #22996305)
* Several object constructors and similar functions in the
NDB (http://dev.mysql.com/doc/refman/5.7/en/mysql-cluster.html)
codebase did not always perform sanity checks when creating new
instances. These checks are now performed under such
circumstances. (Bug #77408, Bug #21286722)
* Cluster API: Reuse of transaction IDs could occur when
Ndb (http://dev.mysql.com/doc/ndbapi/en/ndb-ndb.html) objects
were created and deleted concurrently. As part of this fix, the
NDB API methods lock_ndb_objects()
(http://dev.mysql.com/doc/ndbapi/en/ndb-ndb-cluster-connection-lock-ndb-objects.html)
and unlock_ndb_objects
(http://dev.mysql.com/doc/ndbapi/en/ndb-ndb-cluster-connection-unlock-ndb-objects.html)
are now declared as const. (Bug #23709232)
* Cluster API: When the management server was restarted
while running an MGM API application that continuously monitored
events, subsequent events were not reported to the application,
with timeouts being returned indefinitely instead of an error.
This occurred because sockets for event listeners were not closed
when restarting mgmd. This is fixed by ensuring that event
listener sockets are closed when the management server shuts
down, causing applications using functions such as
ndb_logevent_get_next()
(http://dev.mysql.com/doc/ndbapi/en/mgm-ndb-logevent-get-next.html)
to receive a read error following the restart. (Bug #19474782)
* Cluster API: To process incoming signals, a thread which
wants to act as a receiver must acquire polling rights from the
transporter layer. This can be requested and assigned to a
separate receiver thread, or each client thread can take the
receiver role when it is waiting for a result. When the thread
acting as poll owner receives a sufficient amount of data, it
releases locks on any other clients taken while delivering
signals to them. This could make them runnable again, and the
operating system scheduler could decide that it was time to wake
them up, which happened at the expense of the poll owner threads,
which were in turn excluded from the CPU while still holding
polling rights on it. After this fix, polling rights are released
by a thread before unlocking and signalling other threads. This
makes polling rights available for other threads that are
actively executing on this CPU. This change increases
concurrency when polling receiver data, which should also reduce
latency for clients waiting to be woken up. (Bug #83129, Bug
#24716756)
* Cluster API: libndbclient and libmysqlclient exported
conflicting symbols, resulting in a segmentation fault in debug
builds on Linux. To fix this issue, the conflicting symbols in
libndbclient.so are no longer publicly visible. Due to this
change, the version number for libndbclient.so has been raised
from 6.0.0 to 6.1.0. (Bug #83093, Bug #24707521) References: See
also: Bug #80352, Bug #22722555.
* Cluster API: When NDB schema object ownership checks are
enabled by a given NdbTransaction
(http://dev.mysql.com/doc/ndbapi/en/ndb-ndbtransaction.html),
objects used by this transaction are checked to make sure that
they belong to the NdbDictionary
(http://dev.mysql.com/doc/ndbapi/en/ndb-ndbdictionary.html)
owned by this connection. An attempt to create a NdbOperation
(http://dev.mysql.com/doc/ndbapi/en/ndb-ndboperation.html),
NdbScanOperation
(http://dev.mysql.com/doc/ndbapi/en/ndb-ndbscanoperation.html),
or NdbIndexScanOperation
(http://dev.mysql.com/doc/ndbapi/en/ndb-ndbindexscanoperation.html)
on a table or index not belonging to the same
connection fails. This fix corrects a resource leak which
occurred when the operation object to be created was allocated
before checking schema object ownership and subsequently not
released when the object creation failed. (Bug #81949, Bug
#23623978) References: See also: Bug #81945, Bug #23623251.
* Cluster API: NDB API objects are allocated in the context
of an Ndb (http://dev.mysql.com/doc/ndbapi/en/ndb-ndb.html)
object, or of an NdbTransaction
(http://dev.mysql.com/doc/ndbapi/en/ndb-ndbtransaction.html)
object which is itself owned by an Ndb object. When a given Ndb
object is destroyed, all remaining NdbTransaction objects are
terminated, and all NDB API objects related to this Ndb object
should be released at this time as well. It was found, when there
remained unclosed NdbTransaction objects when their parent Ndb
object was destroyed, leaks of objects allocated from the
NdbTransaction objects could occur. (However, the NdbTransaction
objects themselves did not leak.) While it is advisable (and,
indeed, recommended) to close an NdbTransaction explicitly as
soon as its lifetime ends, the destruction of the parent Ndb
object should be sufficient to release whatever objects are
dependent on it. Now in cases such as described previously, the
Ndb destructor checks to ensure that all objects derived from a
given Ndb instance are truly released. (Bug #81945, Bug
#23623251)
* Cluster API: In some of the NDB API example programs
included with the MySQL Cluster distribution, ndb_end() was
called prior to calling the Ndb_cluster_connection
(http://dev.mysql.com/doc/ndbapi/en/ndb-ndb-cluster-connection.html)
destructor. This caused a segmentation fault in debug
builds on all platforms. The example programs affected have also
been extensively revised and refactored. See NDB API Examples
(http://dev.mysql.com/doc/ndbapi/en/ndb-examples.html), for more
information. (Bug #80352, Bug #22722555) References: See also:
Bug #83093, Bug #24707521.
On behalf of the Oracle MySQL RE Team
Balasubramanian Kandasamy
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MySQL Cluster 7.5.4 has been released (part 2/2) (no replies)
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