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variables
In MariaDB, we have a confusing problem where:
* The transaction_isolation option can be set in a configuration file, but it cannot be set dynamically.
* The tx_isolation system variable can be set dynamically, but it cannot be set in a configuration file.
Therefore, we have two different names for the same thing in different contexts. This is needlessly confusing, and it complicates the documentation. The same thing applys for transaction_read_only.
MySQL 5.7 solved this problem by making them into system variables. https://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-20.html
This commit takes a similar approach by adding new system variables and marking the original ones as deprecated. This commit also resolves some legacy problems related to SET STATEMENT and transaction_isolation.
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fil_space_t::~fil_space_t(): Invoke ut_free(name) because
doing so in the callers would trip MSAN_OPTIONS=poison_in_dtor=1
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handle_slave_io(), handle_slave_sql(), os_thread_exit():
Remove a redundant pthread_exit(nullptr) call, because it
would cause SIGSEGV.
mysql_print_status(): Add MEM_MAKE_DEFINED() to work around
some missing instrumentation around mallinfo2().
que_graph_free_stat_list(): Invoke que_node_get_next(node) before
que_graph_free_recursive(node). That is the logical and
MSAN_OPTIONS=poison_in_dtor=1 compatible way of freeing memory.
ins_node_t::~ins_node_t(): Invoke mem_heap_free(entry_sys_heap).
que_graph_free_recursive(): Rely on ins_node_t::~ins_node_t().
fts_t::~fts_t(): Invoke mem_heap_free(fts_heap).
fts_free(): Replace with direct calls to fts_t::~fts_t().
The failures in free_root() due to MSAN_OPTIONS=poison_in_dtor=1
will be covered in MDEV-30942.
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…with: Test assertion failed
Problem:
=======
Assertion text: 'Value returned by SSS and PS table for Last_Error_Number
should be same.'
Assertion condition: '"1146" = "0"'
Assertion condition, interpolated: '"1146" = "0"'
Assertion result: '0'
Analysis:
========
In parallel replication when slave is started the worker pool gets
activated and it gets cleared when slave stops. Each time the worker pool
gets activated a backup worker pool also gets created to store worker
specific perforance schema information in case of errors. On error, all
relevant information is copied from rpl_parallel_thread to rli and it gets
cleared from thread. Then server waits for all workers to complete their
work, during this stage performance schema table specific worker info is
stored into the backup pool and finally the actual pool gets cleared. If
users query the performance schema table to know the status of workers the
information from backup pool will be used. The test simulates
ER_NO_SUCH_TABLE error and verifies the worker information in pfs table.
Test works fine if execution occurs in following order.
Step 1. Error occurred 'worker information is copied to backup pool'.
Step 2. handle_slave_sql invokes 'rpl_parallel_resize_pool_if_no_slaves' to
deactivate worker pool, it marks the pool->count=0
Step 3. PFS table is queried, since actual pool is deactivated backup pool
information is read.
If the Step 3 happens prior to Step2 the pool is yet to be deactivated and
the actual pool is read, which doesn't have any error details as they were
cleared. Hence test ocasionally fails.
Fix:
===
Upon error mark the back pool as being active so that if PFS table is
quried since the backup pool is flagged as valid its information will be
read, in case it is not flagged regular pool will be read.
This work is one of the last pieces created by the late Sujatha Sivakumar.
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Problem:
========
- InnoDB replace statement returns can't find record as result during
bulk insert operation. InnoDB returns DB_END_OF_INDEX blindly when
bulk transaction is visible to current transaction even though
the search tuple is inserted as a part of current replace statement.
Solution:
=========
row_search_mvcc(): InnoDB should allow the transaction to read
all the rows when innodb intends to do any locking on the
record even though bulk insert transaction changes are
visible to the current transaction
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buf_dblwr_t::init(), buf_dblwr_t::close(): Cover also write_cond,
which was added in commit a55b951e6082a4ce9a1f2ed5ee176ea7dbbaf1f2
without explicit initialization. On GNU/Linux, PTHREAD_COND_INITIALIZER
is a zero-initializer. That is why the default zero initialization
happened to work on that platform.
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btr_cur_upd_rec_in_place(): Avoid calling page_zip_write_rec() if we
are not modifying any fields that are stored in compressed format.
btr_cur_update_in_place_zip_check(): New function to check if a
ROW_FORMAT=COMPRESSED record can actually be updated in place.
btr_cur_pessimistic_update(): If the BTR_KEEP_POS_FLAG is not set
(we are in a ROLLBACK and cannot write any BLOBs), ignore the potential
overflow and let page_zip_reorganize() or page_zip_compress() handle it.
This avoids a failure when an attempted UPDATE of an NULL column to 0 is
rolled back. During the ROLLBACK, we would try to move a non-updated
long column to off-page storage in order to avoid a compression failure
of the ROW_FORMAT=COMPRESSED page.
page_zip_write_trx_id_and_roll_ptr(): Remove an assertion that would fail
in row_upd_rec_in_place() because the uncompressed page would already
have been modified there.
This is a 10.5 version of commit ff3d4395d808b6421d2e0714e10d48c7aa2f3c3a
(different because of commit 08ba388713946c03aa591899cd3a446a6202f882).
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- agressively -> aggressively
- exising -> existing
- occured -> occurred
- releated -> related
- seperated -> separated
- sucess -> success
- use use -> use
All new code of the whole pull request, including one or several files
that are either new files or modified ones, are contributed under the
BSD-new license. I am contributing on behalf of my employer Amazon Web
Services, Inc.
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They became obsolete after commit cfd145faedd:
commit cfd145faedd68e27d4ac8f1e5f95ec1a6dcd8c8d
Author: Nayuta Yanagisawa <nayuta.yanagisawa@hey.com>
Date: Fri Jan 28 01:03:06 2022 +0900
MDEV-27641 Spider: remove #if MYSQL_VERSION_ID < ${VERSION}
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This fixes up commit e371b1e2648f043f1bd27f416b0c52f083cbb410
that accidentally reverted d77aaa6994b30660bd8788d3415ae4a44f55d9a0.
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In commit d6aed21621e438e6135415c0c09fc6adfc0be368 a condition at
the start of buf_read_ahead_random() was refactored. Only the caller
buf_read_recv_pages() was adjusted for this. We must in fact adjust
every caller and make sure that spare blocks will be allocated
while crash recovery is in progress. This is the simplest fix;
ideally recovery would operate on the compressed page frame.
The observed recovery hang occurred because pages 0 and 3 of a
tablespace were being read due to buf_page_get_gen() calls by
trx_resurrect_table_locks() before the log records for these pages
had been applied. In buf_page_t::read_complete() we would skip
the call to recv_recover_page() because no uncompressed page frame
had been allocated for the block.
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The HandlerSocket support of Spider has been deleted by MDEV-26858.
Thus, the constants, SPIDER_SQL_TYPE_*_HS, are no longer necessary.
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We can have dirty_blocks=0 when buf_flush_page_cleaner() is being woken up
to write out or evict pages from the buf_pool.LRU list.
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- INNODB_SYS_TABLESPACES in information schema should display
innodb_undo001, innodb_undo002 etc as tablespace name for undo
tablespaces
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- InnoDB does rollback the whole transaction and discards the
savepoint when there is a failure happens during bulk
insert operation. When server request to release the savepoint,
InnoDB should return DB_SUCCESS when it deals with bulk
insert operation
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For more convenient monitoring of something that could greatly affect
the volume of page writes, we add the status variable
Innodb_buffer_pool_pages_split that was previously only available
via information_schema.innodb_metrics as "innodb_page_splits".
This was suggested by Axel Schwenke.
buf_flush_page_count: Replaced with buf_pool.stat.n_pages_written.
We protect buf_pool.stat (except n_page_gets) with buf_pool.mutex
and remove unnecessary export_vars indirection.
buf_pool.flush_list_bytes: Moved from buf_pool.stat.flush_list_bytes.
Protected by buf_pool.flush_list_mutex.
buf_pool_t::page_cleaner_status: Replaces buf_pool_t::n_flush_LRU_,
buf_pool_t::n_flush_list_, and buf_pool_t::page_cleaner_is_idle.
Protected by buf_pool.flush_list_mutex. We will exclusively broadcast
buf_pool.done_flush_list by the buf_flush_page_cleaner thread,
and only wait for it when communicating with buf_flush_page_cleaner.
There is no need to keep a count of pending writes by the
buf_pool.flush_list processing. A single flag suffices for that.
Waits for page write completion can be performed by
simply waiting on block->page.lock, or by invoking
buf_dblwr.wait_for_page_writes().
buf_LRU_block_free_non_file_page(): Broadcast buf_pool.done_free and
set buf_pool.try_LRU_scan when freeing a page. This would be
executed also as part of buf_page_write_complete().
buf_page_write_complete(): Do not broadcast buf_pool.done_flush_list,
and do not acquire buf_pool.mutex unless buf_pool.LRU eviction is needed.
Let buf_dblwr count all writes to persistent pages and broadcast a
condition variable when no outstanding writes remain.
buf_flush_page_cleaner(): Prioritize LRU flushing and eviction right after
"furious flushing" (lsn_limit). Simplify the conditions and reduce the
hold time of buf_pool.flush_list_mutex. Refuse to shut down
or sleep if buf_pool.ran_out(), that is, LRU eviction is needed.
buf_pool_t::page_cleaner_wakeup(): Add the optional parameter for_LRU.
buf_LRU_get_free_block(): Protect buf_lru_free_blocks_error_printed
with buf_pool.mutex. Invoke buf_pool.page_cleaner_wakeup(true) to
to ensure that buf_flush_page_cleaner() will process the LRU flush
request.
buf_do_LRU_batch(), buf_flush_list(), buf_flush_list_space():
Update buf_pool.stat.n_pages_written when submitting writes
(while holding buf_pool.mutex), not when completing them.
buf_page_t::flush(), buf_flush_discard_page(): Require that
the page U-latch be acquired upfront, and remove
buf_page_t::ready_for_flush().
buf_pool_t::delete_from_flush_list(): Remove the parameter "bool clear".
buf_flush_page(): Count pending page writes via buf_dblwr.
buf_flush_try_neighbors(): Take the block of page_id as a parameter.
If the tablespace is dropped before our page has been written out,
release the page U-latch.
buf_pool_invalidate(): Let the caller ensure that there are no
outstanding writes.
buf_flush_wait_batch_end(false),
buf_flush_wait_batch_end_acquiring_mutex(false):
Replaced with buf_dblwr.wait_for_page_writes().
buf_flush_wait_LRU_batch_end(): Replaces buf_flush_wait_batch_end(true).
buf_flush_list(): Remove some broadcast of buf_pool.done_flush_list.
buf_flush_buffer_pool(): Invoke also buf_dblwr.wait_for_page_writes().
buf_pool_t::io_pending(), buf_pool_t::n_flush_list(): Remove.
Outstanding writes are reflected by buf_dblwr.pending_writes().
buf_dblwr_t::init(): New function, to initialize the mutex and
the condition variables, but not the backing store.
buf_dblwr_t::is_created(): Replaces buf_dblwr_t::is_initialised().
buf_dblwr_t::pending_writes(), buf_dblwr_t::writes_pending:
Keeps track of writes of persistent data pages.
buf_flush_LRU(): Allow calls while LRU flushing may be in progress
in another thread.
Tested by Matthias Leich (correctness) and Axel Schwenke (performance)
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Adaptive flushing is enabled by setting innodb_max_dirty_pages_pct_lwm>0
(not default) and innodb_adaptive_flushing=ON (default).
There is also the parameter innodb_adaptive_flushing_lwm
(default: 10 per cent of the log capacity). It should enable some
adaptive flushing even when innodb_max_dirty_pages_pct_lwm=0.
That is not being changed here.
This idea was first presented by Inaam Rana several years ago,
and I discussed it with Jean-François Gagné at FOSDEM 2023.
buf_flush_page_cleaner(): When we are not near the log capacity limit
(neither buf_flush_async_lsn nor buf_flush_sync_lsn are set),
also try to move clean blocks from the buf_pool.LRU list to buf_pool.free
or initiate writes (but not the eviction) of dirty blocks, until
the remaining I/O capacity has been consumed.
buf_flush_LRU_list_batch(): Add the parameter bool evict, to specify
whether dirty least recently used pages (from buf_pool.LRU) should
be evicted immediately after they have been written out. Callers outside
buf_flush_page_cleaner() will pass evict=true, to retain the existing
behaviour.
buf_do_LRU_batch(): Add the parameter bool evict.
Return counts of evicted and flushed pages.
buf_flush_LRU(): Add the parameter bool evict.
Assume that the caller holds buf_pool.mutex and
will invoke buf_dblwr.flush_buffered_writes() afterwards.
buf_flush_list_holding_mutex(): A low-level variant of buf_flush_list()
whose caller must hold buf_pool.mutex and invoke
buf_dblwr.flush_buffered_writes() afterwards.
buf_flush_wait_batch_end_acquiring_mutex(): Remove. It is enough to have
buf_flush_wait_batch_end().
page_cleaner_flush_pages_recommendation(): Avoid some floating-point
arithmetics.
buf_flush_page(), buf_flush_check_neighbor(), buf_flush_check_neighbors(),
buf_flush_try_neighbors(): Rename the parameter "bool lru" to "bool evict".
buf_free_from_unzip_LRU_list_batch(): Remove the parameter.
Only actual page writes will contribute towards the limit.
buf_LRU_free_page(): Evict freed pages of temporary tables.
buf_pool.done_free: Broadcast whenever a block is freed
(and buf_pool.try_LRU_scan is set).
buf_pool_t::io_buf_t::reserve(): Retry indefinitely.
During the test encryption.innochecksum we easily run out of
these buffers for PAGE_COMPRESSED or ENCRYPTED pages.
Tested by Matthias Leich and Axel Schwenke
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lock_sec_rec_some_has_impl(): Remove a harmful condition that caused the
performance regression and should not have been added in
commit b6e41e38720d1e8d33b2abec0d1109615133bc2b in the first place.
Locking transactions that have not modified any persistent tables
can carry the transaction identifier 0.
trx_t::max_inactive_id: A cache for trx_sys_t::find_same_or_older().
The value is not reset on transaction commit so that previous results
can be reused for subsequent transactions. The smallest active
transaction ID can only increase over time, not decrease.
trx_sys_t::find_same_or_older(): Remember the maximum previous id for which
rw_trx_hash.iterate() returned false, to avoid redundant iterations.
lock_sec_rec_read_check_and_lock(): Add an early return in case we are
already holding a covering table lock.
lock_rec_convert_impl_to_expl(): Add a template parameter to avoid
a redundant run-time check on whether the index is secondary.
lock_rec_convert_impl_to_expl_for_trx(): Move some code from
lock_rec_convert_impl_to_expl(), to reduce code duplication due
to the added template parameter.
Reviewed by: Vladislav Lesin
Tested by: Matthias Leich
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This is a follow-up to
commit de4030e4d49805a7ded5c0bfee01cc3fd7623522 (MDEV-30400),
which fixed some hangs related to B-tree split or merge.
btr_root_block_get(): Use and update the root page guess. This is just
a minor performance optimization, not affecting correctness.
btr_validate_level(): Remove the parameter "lockout", and always
acquire an exclusive dict_index_t::lock in CHECK TABLE without QUICK.
This is needed in order to avoid latching order violation in
btr_page_get_father_node_ptr_for_validate().
btr_cur_need_opposite_intention(): Return true in case
btr_cur_compress_recommendation() would hold later during the
mini-transaction, or if a page underflow or overflow is possible.
If we return true, our caller will escalate to aqcuiring an exclusive
dict_index_t::lock, to prevent a latching order violation and deadlock
during btr_compress() or btr_page_split_and_insert().
btr_cur_t::search_leaf(), btr_cur_t::open_leaf():
Also invoke btr_cur_need_opposite_intention() on the leaf page.
btr_cur_t::open_leaf(): When escalating to exclusive index locking,
acquire exclusive latches on all pages as well.
innobase_instant_try(): Return an error code if the root page cannot
be retrieved.
In addition to the normal stress testing with Random Query Generator (RQG)
this has been tested with
./mtr --mysqld=--loose-innodb-limit-optimistic-insert-debug=2
but with the injection in btr_cur_optimistic_insert() for non-leaf pages
adjusted so that it would use the value 3. (Otherwise, infinite page
splits could occur in some mtr tests.)
Tested by: Matthias Leich
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mariadb-backup --prepare
srv_start(): If we are going to close the log file in
mariadb-backup --prepare, call buf_flush_sync() before
calling recv_sys.debug_free() to ensure that the log file
will not be accessed.
This fixes a rather rare failure in the test
mariabackup.innodb_force_recovery where buf_flush_page_cleaner()
would invoke log_checkpoint_low() because !recv_recovery_is_on()
would hold due to the fact that recv_sys.debug_free() had
already been called. Then, the log write for the checkpoint
would fail because srv_start() had invoked log_sys.log.close_file().
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in MDEV-23855
fil_node_open_file_low() tries to close files from the top of
fil_system.space_list if the number of opened files is exceeded.
It invokes fil_space_t::try_to_close(), which iterates the list searching
for the first opened space. Then it just closes the space, leaving it in
the same position in fil_system.space_list.
On heavy files opening, like during 'SHOW TABLE STATUS ...' execution,
if the number of opened files limit is reached,
fil_space_t::try_to_close() iterates more and more closed spaces before
reaching any opened space for each fil_node_open_file_low() call. What
causes performance regression if the number of spaces is big enough.
The fix is to keep opened spaces at the top of fil_system.space_list,
and move closed files at the end of the list.
For this purpose fil_space_t::space_list_last_opened pointer is
introduced. It points to the last inserted opened space in
fil_space_t::space_list. When space is opened, it's inserted to the
position just after the pointer points to in fil_space_t::space_list to
preserve the logic, inroduced in MDEV-23855. Any closed space is added
to the end of fil_space_t::space_list.
As opened spaces are located at the top of fil_space_t::space_list,
fil_space_t::try_to_close() finds opened space faster.
There can be the case when opened and closed spaces are mixed in
fil_space_t::space_list if fil_system.freeze_space_list was set during
fil_node_open_file_low() execution. But this should not cause any error,
as fil_space_t::try_to_close() still iterates spaces in the list.
There is no need in any test case for the fix, as it does not change any
functionality, but just fixes performance regression.
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