MDEV-7399: Add support for INFORMATION_SCHEMA.INNODB_MUTEXES
MDEV-7618: Improve semaphore instrumentation
Introduced two new information schema tables to monitor mutex waits
and semaphore waits. Added a new configuration variable
innodb_intrument_semaphores to add thread_id, file name and
line of current holder of mutex/rw_lock.
Remove ONLY_IF clause in MYSQL_ADD_PLUGIN and the requirement
that every plugin's CMakeLists.txt *must* do MYSQL_ADD_PLUGIN
for PLUGIN_XXX=YES to work. This was very fragile and cannot be
relied on.
Use a different implementation of =YES check - iterate all
PLUGIN_* variables and see which one doesn't have a matching target.
Revert all ONLY_IF changes in CMakeLists.txt files.
causes server crash
Analysis: If wrong data types used on foreign constraint there
was possibility that foreign->id is NULL when incorrect
foreign constraint was removed from the dictionary cache.
Fix: Add guard foreign->id != NULL before trying to lookup
or remove the foreign constraint from dictionary cache.
Tested using user database where problem was repeatable.
in file buf0mtflu.cc line 439
Analysis: At shutdown multi-threaded flush sends a exit work
items to all mtflush threads. We wait until the work queue is
empty. However, as we did not hold the mutex, some other thread
could also put work-items to work queue.
Fix: Take mutex before adding exit work items to work queue and
wait until all work-items are really processed. Release
mutex after we have marked that multi-threaded flush is not
anymore active.
Fix test failure on innodb_bug12902967 caused by unnecessary
info output on xtradb/buf/buf0mtflush.cc.
Do not try to enable atomic writes if the file type
is not OS_DATA_FILE. Atomic writes are unnecessary
for log files. If we try to enable atomic writes
to log writes that are stored to media supporting
atomic writes we will end up problems later.
Analysis: For some reason actual thread handle is not
returned on Windows instead lpThreadId was returned and
thread handle was closed after thread create. Later
CloseHandle was called for recv_writer_thread_handle
and psort_info->thread_hdl.
Fix: Return thread handle from os_thread_create()
also on Windows and store these thread handles also
in srv0start.cc so that they can be later closed.
Implement a new mode for parallel replication. In this mode, all transactions
are optimistically attempted applied in parallel. In case of conflicts, the
offending transaction is rolled back and retried later non-parallel.
This is an early-release patch to facilitate testing, more changes to user
interface / options will be expected. The new mode is not enabled by default.
