If a master_failure_mode was set to error_on_write, a reconnection to the
old master would happen after the following events:
- Master server fails and the connection is closed
- The master server recovers
- A slave fails and the connection is closed
- A replacement for the slave is searched
If these events took place, the master would be taken back into use with
an inconsistent session state.
This function returns more detailed information about the fields
of a statement. Supersedes qc_get_affected_fields() that will
be deprecated and removed.
Note that this function now introduced new kind of behaviour; the
returned data belongs to the GWBUF and remains valid for as long as
the GWBUF is alive. That means that unnecessary copying need not
be done.
When a persistent connection is taken from the pool, the state is reset
with a COM_CHANGE_USER on the next write. This allows reuse of persistent
connections without having to worry about the state of the MySQL session.
Binlog server is already configured: if there is no pending transaction
a new binlog file is created after CHANGE MASTER.
If as START SLAVE is issued replication starts as usuale.
If maxscale is restarted the replication starts using the new created
file.
While configuring binlog server for the first time, master.ini not
existent, the specified MASTER_LOG_FILE is created in the $binlogdir.
If START SLAVE command is not issued the replication can start after
restarting maxscale as the binlog file exists.
When a COM_CHANGE_USER statement was executed, the new user credentials
were copied after the authentication message was sent. This caused the
COM_CHANGE_USER to always succeed the first time as it used the current
credentials. The user credentials would always lag behind by one.
Given a config file "config.cnf", we look for the directory
"config.cnf.d" and recursively in that hierarhcy load all files
whose suffix is ".cnf"; other files are ignored.
Currently duplicate sections are checked on a file by file basis.
That will be changed so that duplicate sections are not allowed
across all the files.
When checksum is in use and there is an error in replication stream
master connection the blr_terminate_master_replication has no effect.
MXS-961: The checksum detection calls
blr_master_delayed_connect(router); and connection is scheduled again.
The fix will break the main loop as soon as the error indicator byte is
seen and no other computation will be done (such as checksum)
- First <maxscale/cdefs.h>
- Then all system, c-runtime, OS include files in alphabetical order.
- Then include files for "3rd-party" software in a loose order of
importance.
- Then maxscale headers ordered alphabetically.
The MAXROWS_DISCARDING_RESPONSE is handled differently: the OK packet
is sent only after an EOF is seen in a reply even with multiple packet
transmission from the backend
max rows filter first implementation
Resultsets with more than max_resultset_rows
will be skipped and empty result set is returned to client.
Not yet tested with multi_statements
[MaxRows]
type=filter
module=maxrows
max_resultset_rows=10
debug=15
Now that a filter can express that the transaction state is tracked,
the cache implementation can be simplified. We do not need to cater
for the case that a "too short" or "too long" a packet would be
delivered.
Further, since the autocommit mode and transaction state of the session
are tracked, the filter can cache data when it is safe to do so. In
practice that means when either AUTOCOMMIT is ON and no explicit
transaction is active or when a READ ONLY transaction is active,
irrespective of the autocommit state.
In principle it would be possible to tentatively cache data during
a transaction, and if the transaction is committed successfully
flush the tentatively cached data to the actual cache, but that will
be for another day.
The transaction state only reflects explicitly started transactions.
Thus, by looking at the autocommit mode and the transaction state a
component can figure out whether the current statement will be committed
or not.
The transaction state must be updated after a buffer has been split
into buffer containing individual packets.
NOTE: The actual updating of the transaction state and the autocommit
mode is currently wrong, but will be updated in a subsequent change.
The authentication checks make sure that a user has all the required
grants to access the database. This prevents the creation of unnecessary
backend connections reducing the overall load on the database.
Doing preliminary authentication in MaxScale enables the creation of more
informative error messages.
With this change, whether something should be logged or, that is,
whether the used log priority is enabled or not, is checked before
the logging function is called. That should save a few cycles.
Now mxs_log_message() always logs a message, without consideration
for whether the priority is enabled or not. The inline function
mxs_log_is_priority_enabled() returns true if a particular priority
is enabled and the MXS_LOG_MESSAGE() macro (that MXS_ERROR etc. are
expanded into) call that before calling the actual logging function.
Some of the tests depended on a working installation where modules are all
located at the default paths. These tests now explicitly set the module
directory which fixes the immediate problem.
Disabled the starting of services in the service test as this will fail
with real modules. The dummy internal modules aren't build and should be
removed in a later commit. In general, it might be better to do service
level testing outside the internal test suite.
