Bug#25422 (Hang with log tables)
Bug 17876 (Truncating mysql.slow_log in a SP after using cursor locks the
thread)
Bug 23044 (Warnings on flush of a log table)
Bug 29129 (Resetting general_log while the GLOBAL READ LOCK is set causes
a deadlock)
Prior to this fix, the server would hang when performing concurrent
ALTER TABLE or TRUNCATE TABLE statements against the LOG TABLES,
which are mysql.general_log and mysql.slow_log.
The root cause traces to the following code:
in sql_base.cc, open_table()
if (table->in_use != thd)
{
/* wait_for_condition will unlock LOCK_open for us */
wait_for_condition(thd, &LOCK_open, &COND_refresh);
}
The problem with this code is that the current implementation of the
LOGGER creates 'fake' THD objects, like
- Log_to_csv_event_handler::general_log_thd
- Log_to_csv_event_handler::slow_log_thd
which are not associated to a real thread running in the server,
so that waiting for these non-existing threads to release table locks
cause the dead lock.
In general, the design of Log_to_csv_event_handler does not fit into the
general architecture of the server, so that the concept of general_log_thd
and slow_log_thd has to be abandoned:
- this implementation does not work with table locking
- it will not work with commands like SHOW PROCESSLIST
- having the log tables always opened does not integrate well with DDL
operations / FLUSH TABLES / SET GLOBAL READ_ONLY
With this patch, the fundamental design of the LOGGER has been changed to:
- always open and close a log table when writing a log
- remove totally the usage of fake THD objects
- clarify how locking of log tables is implemented in general.
See WL#3984 for details related to the new locking design.
Additional changes (misc bugs exposed and fixed):
1)
mysqldump which would ignore some tables in dump_all_tables_in_db(),
but forget to ignore the same in dump_all_views_in_db().
2)
mysqldump would also issue an empty "LOCK TABLE" command when all the tables
to lock are to be ignored (numrows == 0), instead of not issuing the query.
3)
Internal errors handlers could intercept errors but not warnings
(see sql_error.cc).
4)
Implementing a nested call to open tables, for the performance schema tables,
exposed an existing bug in remove_table_from_cache(), which would perform:
in_use->some_tables_deleted=1;
against another thread, without any consideration about thread locking.
This call inside remove_table_from_cache() was not required anyway,
since calling mysql_lock_abort() takes care of aborting -- cleanly -- threads
that might hold a lock on a table.
This line (in_use->some_tables_deleted=1) has been removed.
Stopping mysql server could result in an entry in mysql error
file: "InnoDB: Error: MySQL is freeing a thd".
This happened because InnoDB assumes that the server will never
call external_lock(F_UNLCK) in case external_lock(READ/WRITE)
failed.
Prior to this patch we haven't had strict definition whether
external_lock(F_UNLCK) must be called in case external_lock(READ/WRITE)
fails.
This patch states that we never call external_lock(F_UNLCK) in case
external_lock(READ/WRITE) fails.
for enabling threads. However, duplicate AC_PROG_* macros in the
innobase plug.in file were resetting $CC and causing link errors.
As AC_PROG_* macros are already used in the main configure.in file
there should be no need for them to be duplicated here too.
Problem: the data file changes made during delete/update are not visible to
other threads as the file is reopened, so reading data
with old descriptors might miss the changes.
Fix: reopen the data file before reading if it was reopened during
delete/update to ensure there's no data behind.
Note: there's no simple test case.
Part 2:
Searching fulltext index for a word with boolean mode truncation
operator may cause infinite loop.
The problem was that "smarter index merge" was used with "trunc-words",
which must never happen.
Affects 5.1 only.
After applying the snapshots, ensure that code conforms to the final version
of WL 3914.
It is signficant that, after these changes, InnoDB does not define MYSQL_SERVER,
and can be built as an independent storage engine plugin.
Fixes:
Bug#9709: InnoDB inconsistensy causes "Operating System Error 32/33"
Bug#18828: If InnoDB runs out of undo slots, it returns misleading 'table is full'
Bug#20090: InnoDB: Error: trying to declare trx to enter InnoDB
Bug#20352: Make ibuf_contract_for_n_pages tunable
Bug#21101: Wrong error on exceeding max row size for InnoDB table
Bug#21293: Deadlock detection prefers to kill long running FOR UPDATE queries
Bug#22819: SHOW INNODB STATUS crashes the server with an assertion failure under high load
Bug#25078: Make the replication thread to ignore innodb_thread_concurrency
Bug#25645: Assertion failure in file srv0srv.c
Bug#28138: indexing column prefixes produces corruption in InnoDB
