The problem was that for merge tables without any underlaying tables the
block size was 0, which the code could not handle.
Fixed by ensuring that MERGE tables never have a block size of 0.
Fixed also a wrong assumption of number of seeks needed to scan
merge tables.
rtr_ins_enlarge_mbr(): Relax the assertion that was added in
commit f27e9c8947
to cover also table-rebuilding DDL. We only need
btr_cur->rtr_info->thr for acquiring R-tree locks,
and the thread that is executing a DDL operation has exclusive
access to the being-built index or the copy of the being-rebuilt table.
Set the lock wait timeout to 1 beforehand, and reset it afterwards, to
avoid lock conflict caused by opening the same table twice in case of
self-reference.
Extracted out common subroutines, gave more meaningful names etc,
added comments etc.
Also:
- Documented active servers load balancing reads, and other fields in
SPIDER_SHARE etc.
- Removed commented out code
- Documented and refactored self-reference check
- Removed some unnecessary functions
- Renamed unhelpful roop_count
- Refactored spider_get_{sts,crd}, where we turn get_type into an enum
- Cleaned up spider_mbase_handler::show_table_status() and
spider_mbase_handler::show_index()
log_free_check(): Assert that the caller must not hold
exclusive lock_sys.latch. This was the case for calls from
ibuf_delete_for_discarded_space(). This caused a deadlock with
another thread that would be holding a latch on a dirty page
that would need to be written so that the checkpoint would advance
and log_free_check() could return. That other thread was waiting
for a shared lock_sys.latch.
fil_delete_tablespace(): Do not invoke ibuf_delete_for_discarded_space()
because in DDL operations, we will be holding exclusive lock_sys.latch.
trx_t::commit(std::vector<pfs_os_file_t>&), innodb_drop_database(),
row_purge_remove_clust_if_poss_low(), row_undo_ins_remove_clust_rec(),
row_discard_tablespace_for_mysql():
Invoke ibuf_delete_for_discarded_space() on the deleted tablespaces after
releasing all latches.
page_cleaner_flush_pages_recommendation(): If dirty_pct is
between innodb_max_dirty_pages_pct_lwm
and innodb_max_dirty_pages_pct,
scale the effort relative to how close we are to
innodb_max_dirty_pages_pct.
The previous formula was missing a multiplication by 100.
Tested by: Axel Schwenke
buf_pool_t::page_cleaner_wakeup(): If for_LRU=true, wake up the page
cleaner immediately, also when it is in a timed wait. This avoids an
unnecessary delay of up to 1 second.
When commit a5a2ef079c
implemented asynchronous doublewrite, the writes via
the doublewrite buffer started to be counted incorrectly,
without multiplying them by innodb_page_size.
srv_export_innodb_status(): Correctly count the
Innodb_data_written.
buf_dblwr_t: Remove submitted(), because it is close to written()
and only Innodb_data_written was interested in it. According to
its name, it should count completed and not submitted writes.
Tested by: Axel Schwenke
os_aio_wait_until_no_pending_reads(), os_aio_wait_until_pending_writes():
Add a Boolean parameter to indicate whether the wait should be declared
in the thread pool.
buf_flush_wait(): The callers have already declared a wait, so let us
avoid doing that again, just call os_aio_wait_until_pending_writes(false).
buf_flush_wait_flushed(): Do not declare a wait in the rare case that
the buf_flush_page_cleaner thread has been shut down already.
buf_flush_page_cleaner(), buf_flush_buffer_pool(): In the code that runs
during shutdown, do not declare waits.
buf_flush_buffer_pool(): Remove a debug assertion that might fail.
What really matters here is buf_pool.flush_list.count==0.
buf_read_recv_pages(), srv_prepare_to_delete_redo_log_file():
Do not declare waits during InnoDB startup.
- This patch does the following:
git revert --no-commit 673243c893
git revert --no-commit 6c669b9586
git revert --no-commit bacaf2d4f4
git checkout HEAD mysql-test
git revert --no-commit 1fd7d3a9ad
Above command reverts MDEV-29277, MDEV-25581, MDEV-29342.
When binlog is enabled, trasaction takes a lot of time to do
sync operation on innodb fts table. This leads to block
of other transaction commit. To avoid this failure, remove
the fulltext sync operation during transaction commit. So
reverted MDEV-25581 related patches.
We filed MDEV-31105 to avoid the memory consumption
problem during fulltext sync operation.
- `mariadb-backup --backup` was fixed to fetch the value of the
@@aria_log_dir_path server variable and copy aria_log* files
from @@aria_log_dir_path directory to the backup directory.
Absolute and relative (to --datadir) paths are supported.
Before this change aria_log* files were copied to the backup
only if they were in the default location in @@datadir.
- `mariadb-backup --copy-back` now understands a new my.cnf and command line
parameter --aria-log-dir-path.
`mariadb-backup --copy-back` in the main loop in copy_back()
(when copying back from the backup directory to --datadir)
was fixed to ignore all aria_log* files.
A new function copy_back_aria_logs() was added.
It consists of a separate loop copying back aria_log* files from
the backup directory to the directory specified in --aria-log-dir-path.
Absolute and relative (to --datadir) paths are supported.
If --aria-log-dir-path is not specified,
aria_log* files are copied to --datadir by default.
- The function is_absolute_path() was fixed to understand MTR style
paths on Windows with forward slashes, e.g.
--aria-log-dir-path=D:/Buildbot/amd64-windows/build/mysql-test/var/...
The motivation of this change is to allow undo pages for temporary tables
to be marked free as often as possible, so that we can avoid buf_pool.LRU
eviction (and writes) of undo pages that contain data that is
no longer needed. For temporary tables, no MVCC or purge of history
is needed, and reusing cached undo log pages might not help that much.
It is possible that this may cause some performance regression due to
more frequent allocation and freeing of undo log pages, but I only
measured a performance improvement.
trx_write_serialisation_history(): Never cache temporary undo log pages.
trx_undo_reuse_cached(): Assert that the rollback segment is persistent.
trx_undo_assign_low(): Add template<bool is_temp>. Never invoke
trx_undo_reuse_cached() for temporary tables.
Tested by: Matthias Leich
Let us remove explicit updates of MONITOR_NUM_UNDO_SLOT_USED
and MONITOR_NUM_UNDO_SLOT_CACHED, and let us compute the rough values
from trx_sys.rseg_array[] on demand.
trx_purge_truncate_rseg_history(): If all other conditions for
invoking trx_purge_remove_log_hdr() hold, but the state is
TRX_UNDO_CACHED instead of TRX_UNDO_TO_PURGE, detach and free it.
Tested by: Matthias Leich
buf_LRU_get_free_block(): Always wake up the page cleaner if needed
before exiting the inner loop.
srv_prepare_to_delete_redo_log_file():
Replace a debug assertion with a wait in debug builds.
Starting with commit 7e31a8e7fa
the debug assertion ut_ad(!os_aio_pending_writes())
could occasionally fail, while it would hold in core dumps of crashes.
The failure can be reproduced more easily by adding a sleep to the
write completion callback function, right before releasing to
write_slots.
srv_start(): Remove a bogus debug assertion
ut_ad(!os_aio_pending_writes()) that could fail in
mariadb-backup --prepare. In an rr replay trace, we had
buf_pool.flush_list.count==0 but write_slots->m_cache.m_pos==1
and buf_page_t::write_complete() was executing u_unlock().
fp->field_length was unsigned and therefore the negative
condition around it.
Backport of cc182aca93 fixes it, however to correct the
consistent use of types pcf->Length needs to be unsigned
too.
At one point pcf->Precision is assigned from pcf->Length so
that's also unsigned.
GetTypeSize is assigned to length and has a length argument.
A -1 default value seemed dangerious to case, so at least 0
should assert if every hit.
buf_flush_wait_flushed(): Correct the logic for registering a wait
around buf_flush_wait() that
commit a091d6ac4e
recently broke. This should be easily repeatable when using a
non-default startup parameter:
thread-handling=pool-of-threads
trx_purge_free_segment(): The buffer-fix only prevents a block from
being freed completely from the buffer pool, but it will not prevent
the block from being evicted. Recheck the page identifier after
acquiring an exclusive page latch. If it has changed, backtrack and
invoke buf_page_get_gen() to look up the page normally.
Similar to 567b6812 continue to replace use of strcat() and
strcpy() with safer options strncat() and strncpy().
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
io_callback(): Process the request before releasing the write slot.
Before commit a091d6ac4e
when we had a duplicated counter for writes, either ordering was fine.
Now, correctness depends on os_aio_wait_until_no_pending_writes().
buf_flush_LRU_list_batch(): When evicting clean pages,
release and reacquire the buf_pool.mutex after every 32 pages.
Also, eliminate some conditional branches.
fil_space_t::create(), fil_space_t::add(): Expect the caller to
acquire and release fil_system.mutex. In this way, creating a tablespace
and adding the first (usually only) data file will be atomic.
recv_sys_t::recover_deferred(): Correctly protect some changes by
holding fil_system.mutex.
Tested by: Matthias Leich
trx_assign_rseg_low(): Let us restore the debug variable look_for_rollover
to avoid assertion failures when a server that was created with
multiple undo tablespaces is being started with innodb_undo_tablespaces=0.
stored externally
row_merge_buf_add(): Has strict assert that fixed length mismatch
shouldn't happen while rebuilding the redundant row format table
btr_index_rec_validate(): Fixed size column can be stored externally.
So sum of inline stored length and external stored length of the
column should be equal to total column length
This issue happens when race condition happens when DDL
and fts optimize thread. DDL adds the new index to fts cache.
At the same time, fts optimize thread clears the cache
and reinitialize it. Take cache init lock before reinitializing
the cache. fts_sync_commit() should take dict_sys mutex
to avoid the deadlock with create index.
trx_assign_rseg_low(): Simplify the debug check.
trx_rseg_t::reinit(): Reset the skip_allocation() flag.
This logic was broken in the merge
commit 3e2ad0e918
of commit 0de3be8cfd
(that is, innodb_undo_log_truncate=ON would never be "completed").
Tested by: Matthias Leich
