Currently the state change explanations are only added to mariadbmon. They
are less relevant for Galera clusters as they themselves explain why they
change their states but should still be added to make them easier to
analyze.
The event that isn't explained and is most often encountered is the loss
of a Slave status. Most often the loss of a Slave status happens because
either the IO thread or the SQL thread has stopped. Printing the states of
the threads as well as the latest error should hint at what caused the
outage.
The information can be added to the REST API in 2.5 where the monitors can
add extra information to the server JSON.
Backporting to 2.4.
The listener search used the host and port for listeners that used sockets
and vice versa. This caused multiple listeners with sockets to fail to be
created.
The sqlite code is indented oddly:
In file included from query_classifier/qc_sqlite/qc_sqlite3.c:21:
sqlite-bld-3110100/sqlite3.c:98051:3: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation]
98051 | if( a[0]<33 ) a[0] = 33; assert( 33==sqlite3LogEst(10) );
| ^~
sqlite-bld-3110100/sqlite3.c:98051:35: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the ‘if’
98051 | if( a[0]<33 ) a[0] = 33; assert( 33==sqlite3LogEst(10) );
| ^~~~~~
In the case of qc_sqlite, it is done "precisely", while in the
case of qc_mysqlembedded rather bluntly. Not time well spent
to figure out exactly which pointer chains need to be walked.
When a transaction migration starts, the old master must be
unconditionally closed. This is the simplest way of resetting the
connection state and it also helps close unused connections.
The test failed because the linux user it used was not available
on buildbot. Now the test is part of the larger pam_authentication-
test, which sets up the users.
The LOAD DATA LOCAL INFILE is handled in a way where it returns two
results that both are complete: the first one with the file being
requested and the second one with the final OK packet. Readwritesplit
called session_book_server_response for both statements which caused the
current query index to drop to -1 which in turn was unconditionally used
as the buffer offset.
The new check for the invalid index value will help prevent crashes in
production while still allowing it to be detected while testing.
The error messages are now generated at the site where the error is
detected. This allows a more accurate error to be reported when invalid
parameter values are read.
As Xpand does not have a mysql.user table but a system.users
table, we need to arrange things so that the query used for
selecting annymous users can be different depending on the cluster.
Needs to be a member function as the dropping of anonymous
users must be done differently for Xpand. With current code,
no anonymous users in Xpand will be dropped, and there will
always be an error (so, should someone care about the return
code, this would not work).
Xpand nodes must be added one by one to the cluster as an attempt
to add more nodes will fail, if any of the nodes to be added
already are in the cluster.
Further, the adding of a node may also fail if, when the addition
is made, the addition of the previous node is still in process.
Now it will be attempted at most 5 times, while sleaping as many
seconds between each attempt as there has been attempts.
Some additional logging was also added.
