The fix isn't fully functional as closed DCBs never process the events
they receive. The mechanism would work if certain events would be
processed but they'll have to be fixed in a later release.
Connectors that wouldn't send the plugin name even when the plugin
authentication capability was enabled would have to do an extra step in
the authentication.
This prevents the server from selecting the charset under which the
queries are processed which can result in conflicts if the tables used are
not compatible with the charset of the string literals used in the query.
The diagnostics_json call could access the std::unordered_map at the same
time it was being updated by the monitoring thread. This leads to
undefined behavior which in the case of MXS-3059 manifested as a segfault.
The call to gwbuf_length will fail if the pointed to buffer isn't the head
of the chain. To prevent this, the length is calculated before the buffer
is appended.
Also fixed the use of gwbuf_append. The return value should be assigned
and the code shouldn't reply on the value passed to the function being
correct.
The code used a null GWBUF with gwbuf_append which causes a crash. The
return value of the function that used it was also not correctly handled
and would be mistaken for a different error.
If the protocol routes a COM_QUIT packet to the backend, it must not
generate a packet when it is shutting down. This could cause unexpected
write errors if the backend server managed to close the socket before the
write was done.
By deferring the closing of a DCB until the protocol tells that it's in a
stable state, we avoid closing the connection mid-authentication. This
makes sure that all connections have reached a stable state before they
are closed which in turn prevents the connections from counting towards
aborted connects (or failed authentications like it did with the old fix).
If a DCB is expecting a response from the server, it must not be placed
into the connection pool. This prevents the case where unexpected
responses would be delivered to DCBs taken out of the connection pool.
The shutdown signal handlers were installed before the workers were
initialized and weren't removed before the workers were deleted. This
would lead to a debug assertion and an eventual crash when a SIGTERM
signal was received outside of the expected scope.
The proper way to do this is to install the handlers only after the system
is up and running and to disable them as soon as the shutdown process
starts.
This mostly happened with the mxs621_unreadable_cnf test as it seemed to
receive a SIGTERM during the execution of the at-exit handlers.
For whatever reason, galera complains on startup about
wsrep_cluster_address missing even when mysql_install_db is run. By making
sure that we configure it before we initialize the database, the problems
seem to go away.
The documents themselves were removed by MXS-2944, so the links
should not be there. Their presence will also prevent the documents
from being removed in KB.
Problem was that 'handler' is a keyword. To make it work,
the keyword must be listed as one of those that turns into
an id where it cannot be used as a keyword.
In some cases the dbfwfilter is too strict and SQL that would not match a
rule is blocked due to it not being fully parsed. To allow a more lenient
mode of operation, the requirement for full parsing must be made
configurable.
