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os_file_read(): Merged with os_file_read_no_error_handling().
Crashing on a partial page read is as unhelpful as crashing on a
corrupted page read (commit 0b47c126e31cddda1e94588799599e138400bcf8).
Report the file name if it is available via IORequest.
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fil_space_t::prepare_acquired(): Do not attempt to extend (or shrink)
files that will be processed by recv_sys_t::recover_deferred().
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trx_undo_page_report_rename(): Use the correct maximum length of
a table name. Both the database name and the table name can be up to
NAME_CHAR_LEN (64 characters) times 5 bytes per character in the
my_charset_filename encoding. They are not encoded in UTF-8!
fil_op_write_log(): Reserve the correct amount of log buffer for
a rename operation. The file name will be appended by
mlog_catenate_string().
rename_file_ext(): Reserve a large enough buffer for the file names.
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Starting with commit da094188f60bf67e3d90227304a4ea256fe2630f (MDEV-24393),
MariaDB will no longer acquire advisory file locks on InnoDB data
files by default, because it would create a large number of
entries in Linux /proc/locks.
The motivation for acquiring the file locks is to prevent accidental
concurrent startup of multiple server processes on the same data files.
Such mistake still turns out to be relatively common, based on
corruption bug reports from the community.
To prevent corruption due to concurrent startup attempts, the
Aria storage engine would unconditionally acquire an advisory lock
on one of its log files.
Solution: InnoDB will always lock its system tablespace files.
(Ever since commit 685d958e38b825ad9829be311f26729cccf37c46
the InnoDB log file will not necessarily be open while the
server is running, because it can be accessed via memory-mapped I/O.)
If more protection is desired, then the option --external-locking
can be used.
The mandatory advisory lock also fixes intermittent failures of
some crash recovery tests. It turns out that when the mtr test harness
kills and restarts the server, it will not actually ensure that the
old process has terminated before starting the new one.
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The logic on Windows was originally simplified in
commit 4bca1a786f9986cec7d0487059451e51e2b9479b
for storage/xtradb and later in
commit 6304c0bfc7242ad54d93168e97e82022765934e3
for storage/innobase.
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fil_space_t::acquire_low(): Introduce a parameter that specifies
which flags should be avoided. At all times, referenced() must not
be incremented if the STOPPING flag is set. When fil_system.mutex
is not being held by the current thread, the reference must not be
incremented if the CLOSING flag is set (unless NEEDS_FSYNC is set,
in fil_space_t::flush()).
fil_space_t::acquire(): Invoke acquire_low(STOPPING | CLOSING).
In this way, the reference count cannot be incremented after
fil_space_t::try_to_close() invoked fil_space_t::set_closing().
If the CLOSING flag was set, we must retry acquire_low() after
acquiring fil_system.mutex.
fil_space_t::prepare_acquired(): Replaces prepare(true).
fil_space_t::acquire_and_prepare(): Replaces prepare().
This basically retries fil_space_t::acquire() after
acquiring fil_system.mutex.
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FILE_CHECKPOINT
There was a race condition between log_checkpoint_low() and
deleting or renaming data files. The scenario is as follows:
1. The buffer pool does not contain dirty pages.
2. A FILE_DELETE or FILE_RENAME record is written.
3. The checkpoint LSN will be moved ahead of the write of the record.
4. The server is killed before the file is actually renamed or deleted.
We will prevent this race condition by ensuring that a log checkpoint
cannot occur between the durable write and the file system operation:
1. Durably write the FILE_DELETE or FILE_RENAME record.
2. Perform the file system operation.
3. Allow any log checkpoint to proceed.
mtr_t::commit_file(): Implement the DELETE or RENAME logic.
fil_delete_tablespace(): Delegate some of the logic to
mtr_t::commit_file().
fil_space_t::rename(): Delegate some logic to mtr_t::commit_file().
Remove the debug injection point fil_rename_tablespace_failure_2
because we do test RENAME failures without any debug injection.
fil_name_write_rename_low(), fil_name_write_rename(): Remove.
Tested by Matthias Leich
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A prominent remaining source of crashes on corrupted index pages
is page directory corruption.
A frequent caller of page_dir_find_owner_slot() is page_rec_get_prev().
Some of those calls can be replaced with simpler logic that is less
prone to fail.
page_dir_find_owner_slot(),
page_rec_get_prev(), page_rec_get_prev_const(),
btr_pcur_move_to_prev(), btr_pcur_move_to_prev_on_page(),
btr_cur_upd_rec_sys(),
page_delete_rec_list_end(),
rtr_page_copy_rec_list_end_no_locks(),
rtr_page_copy_rec_list_start_no_locks(): Return an error code on failure.
fil_space_t::io(), buf_page_get_low(): Use DB_CORRUPTION for
out-of-bounds page reads.
PageBulk::getSplitRec(), PageBulk::copyOut(): Simplify the code.
btr_validate_level(): Prevent some more CHECK TABLE crashes on
corrupted pages.
btr_block_get(), btr_pcur_move_to_next_page(): Implement some checks that
were previously only part of IndexPurge::next().
IndexPurge::next(): Use btr_pcur_move_to_next_page().
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Even after commit 0b47c126e31cddda1e94588799599e138400bcf8
there are a few ib::fatal() calls in non-debug code
that can be replaced easily.
btr_page_reorganize_low(): On size invariant violation, return
an error code instead of crashing.
btr_check_blob_fil_page_type(): On an invalid page type, report
an error but do not crash.
btr_copy_blob_prefix(): Truncate the output if a page type is invalid.
dict_load_foreign_cols(): On an error, return DB_CORRUPTION instead
of crashing.
fil_space_decrypt_full_crc32(), fil_space_decrypt_for_non_full_checksum():
On error, return DB_DECRYPTION_FAILED instead of crashing.
fil_set_max_space_id_if_bigger(): Replace ib::fatal() with an
equivalent ut_a() assertion.
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We will introduce an optional log record OPT_PAGE_CHECKSUM for recording
page checksums, so that more inconsistencies on crash recovery may be
caught.
mtr_t::page_checksum(const buf_page_t&): Write OPT_PAGE_CHECKSUM
(currently not for ROW_FORMAT=COMPRESSED pages).
mtr_t::do_write(): Write OPT_PAGE_CHECKSUM records for all pages
(currently, in debug builds only).
mtr_t::is_logged(): Return whether log should be written.
mtr_t::set_log_mode_sub(const mtr_t&): Set the logging mode of
a sub-minitransaction when another mini-transaction is holding
latches on some modified pages. When creating or freeing BLOB pages,
we may only write OPT_PAGE_CHECKSUM records in the main mini-transaction,
after all changes have been written to the log.
MTR_LOG_SUB: Log mode for a sub-mini-transaction.
mtr_t::free(): Define non-inline, and invoke MarkFreed.
MarkFreed: For any matching page in the mini-transaction log,
change the first entry to say MTR_MEMO_PAGE_X_MODIFY and any subsequent
entries to MTR_MEMO_PAGE_X_FIX.
FindModified: Simplify a condition. MTR_MEMO_MODIFY can only be set
if MTR_MEMO_PAGE_X_FIX or MTR_MEMO_PAGE_SX_FIX are set.
FindBlockX: Consider also MTR_MEMO_PAGE_X_MODIFY.
recv_sys_t::parse(): Store OPT_PAGE_CHECKSUM records.
log_phys_t::apply(): Validate OPT_PAGE_CHECKSUM records.
log_phys_t::page_checksum(): Validate an OPT_PAGE_CHECKSUM record.
Tested by: Matthias Leich
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--debug-dbug=d,intermittent_read_failure is effective after the
database has been started up.
--debug-dbug=d,intermittent_recovery_failure is always effective,
including during recovery.
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The approach to handling corruption that was chosen by Oracle in
commit 177d8b0c125b841c0650d27d735e3b87509dc286
is not really useful. Not only did it actually fail to prevent InnoDB
from crashing, but it is making things worse by blocking attempts to
rescue data from or rebuild a partially readable table.
We will try to prevent crashes in a different way: by propagating
errors up the call stack. We will never mark the clustered index
persistently corrupted, so that data recovery may be attempted by
reading from the table, or by rebuilding the table.
This should also fix MDEV-13680 (crash on btr_page_alloc() failure);
it was extensively tested with innodb_file_per_table=0 and a
non-autoextend system tablespace.
We should now avoid crashes in many cases, such as when a page
cannot be read or allocated, or an inconsistency is detected when
attempting to update multiple pages. We will not crash on double-free,
such as on the recovery of DDL in system tablespace in case something
was corrupted.
Crashes on corrupted data are still possible. The fault injection mechanism
that is introduced in the subsequent commit may help catch more of them.
buf_page_import_corrupt_failure: Remove the fault injection, and instead
corrupt some pages using Perl code in the tests.
btr_cur_pessimistic_insert(): Always reserve extents (except for the
change buffer), in order to prevent a subsequent allocation failure.
btr_pcur_open_at_rnd_pos(): Merged to the only caller ibuf_merge_pages().
btr_assert_not_corrupted(), btr_corruption_report(): Remove.
Similar checks are already part of btr_block_get().
FSEG_MAGIC_N_BYTES: Replaces FSEG_MAGIC_N_VALUE.
dict_hdr_get(), trx_rsegf_get_new(), trx_undo_page_get(),
trx_undo_page_get_s_latched(): Replaced with error-checking calls.
trx_rseg_t::get(mtr_t*): Replaces trx_rsegf_get().
trx_rseg_header_create(): Let the caller update the TRX_SYS page if needed.
trx_sys_create_sys_pages(): Merged with trx_sysf_create().
dict_check_tablespaces_and_store_max_id(): Do not access
DICT_HDR_MAX_SPACE_ID, because it was already recovered in dict_boot().
Merge dict_check_sys_tables() with this function.
dir_pathname(): Replaces os_file_make_new_pathname().
row_undo_ins_remove_sec(): Do not modify the undo page by adding
a terminating NUL byte to the record.
btr_decryption_failed(): Report decryption failures
dict_set_corrupted_by_space(), dict_set_encrypted_by_space(),
dict_set_corrupted_index_cache_only(): Remove.
dict_set_corrupted(): Remove the constant parameter dict_locked=false.
Never flag the clustered index corrupted in SYS_INDEXES, because
that would deny further access to the table. It might be possible to
repair the table by executing ALTER TABLE or OPTIMIZE TABLE, in case
no B-tree leaf page is corrupted.
dict_table_skip_corrupt_index(), dict_table_next_uncorrupted_index(),
row_purge_skip_uncommitted_virtual_index(): Remove, and refactor
the callers to read dict_index_t::type only once.
dict_table_is_corrupted(): Remove.
dict_index_t::is_btree(): Determine if the index is a valid B-tree.
BUF_GET_NO_LATCH, BUF_EVICT_IF_IN_POOL: Remove.
UNIV_BTR_DEBUG: Remove. Any inconsistency will no longer trigger
assertion failures, but error codes being returned.
buf_corrupt_page_release(): Replaced with a direct call to
buf_pool.corrupted_evict().
fil_invalid_page_access_msg(): Never crash on an invalid read;
let the caller of buf_page_get_gen() decide.
btr_pcur_t::restore_position(): Propagate failure status to the caller
by returning CORRUPTED.
opt_search_plan_for_table(): Simplify the code.
row_purge_del_mark(), row_purge_upd_exist_or_extern_func(),
row_undo_ins_remove_sec_rec(), row_undo_mod_upd_del_sec(),
row_undo_mod_del_mark_sec(): Avoid mem_heap_create()/mem_heap_free()
when no secondary indexes exist.
row_undo_mod_upd_exist_sec(): Simplify the code.
row_upd_clust_step(), dict_load_table_one(): Return DB_TABLE_CORRUPT
if the clustered index (and therefore the table) is corrupted, similar
to what we do in row_insert_for_mysql().
fut_get_ptr(): Replace with buf_page_get_gen() calls.
buf_page_get_gen(): Return nullptr and *err=DB_CORRUPTION
if the page is marked as freed. For other modes than
BUF_GET_POSSIBLY_FREED or BUF_PEEK_IF_IN_POOL this will
trigger a debug assertion failure. For BUF_GET_POSSIBLY_FREED,
we will return nullptr for freed pages, so that the callers
can be simplified. The purge of transaction history will be
a new user of BUF_GET_POSSIBLY_FREED, to avoid crashes on
corrupted data.
buf_page_get_low(): Never crash on a corrupted page, but simply
return nullptr.
fseg_page_is_allocated(): Replaces fseg_page_is_free().
fts_drop_common_tables(): Return an error if the transaction
was rolled back.
fil_space_t::set_corrupted(): Report a tablespace as corrupted if
it was not reported already.
fil_space_t::io(): Invoke fil_space_t::set_corrupted() to report
out-of-bounds page access or other errors.
Clean up mtr_t::page_lock()
buf_page_get_low(): Validate the page identifier (to check for
recently read corrupted pages) after acquiring the page latch.
buf_page_t::read_complete(): Flag uninitialized (all-zero) pages
with DB_FAIL. Return DB_PAGE_CORRUPTED on page number mismatch.
mtr_t::defer_drop_ahi(): Renamed from mtr_defer_drop_ahi().
recv_sys_t::free_corrupted_page(): Only set_corrupt_fs()
if any log records exist for the page. We do not mind if read-ahead
produces corrupted (or all-zero) pages that were not actually needed
during recovery.
recv_recover_page(): Return whether the operation succeeded.
recv_sys_t::recover_low(): Simplify the logic. Check for recovery error.
Thanks to Matthias Leich for testing this extensively and to the
authors of https://rr-project.org for making it easy to diagnose
and fix any failures that were found during the testing.
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mtr_t::is_empty(): Replaces mtr_t::get_log() and mtr_t::get_memo().
mtr_t::get_log_size(): Replaces mtr_t::get_log().
mtr_t::print(): Remove, unused function.
ReleaseBlocks::ReleaseBlocks(): Remove an unused parameter.
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This is a backport of commit 4489a89c71ea78f2562159ca0303fbb83da5baa0
in order to remove the test innodb.redo_log_during_checkpoint
that would cause trouble in the DBUG subsystem invoked by
safe_mutex_lock() via log_checkpoint(). Before
commit 7cffb5f6e8a231a041152447be8980ce35d2c9b8
these mutexes were of different type.
The following options were introduced in
commit 2e814d4702d71a04388386a9f591d14a35980bfe (mariadb-10.2.2)
and have little use:
innodb_disable_resize_buffer_pool_debug had no effect even in
MariaDB 10.2.2 or MySQL 5.7.9. It was introduced in
mysql/mysql-server@5c4094cf4971eebab89da4ee4ae92c71f69cd524
to work around a problem that was fixed in
mysql/mysql-server@2957ae4f990bf3aed25822b0ce15d3ccad0b54b6
(but the parameter was not removed).
innodb_page_cleaner_disabled_debug and innodb_master_thread_disabled_debug
are only used by the test innodb.redo_log_during_checkpoint
that will be removed as part of this commit.
innodb_dict_stats_disabled_debug is only used by that test,
and it is redundant because one could simply use
innodb_stats_persistent=OFF or the STATS_PERSISTENT=0 attribute
of the table in the test to achieve the same effect.
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Due to 32-bit arithmetics, SRV_TMP_SPACE_ID page number 0x200002 would be
folded to 0, which is incompatible with the assumption that was made in
commit 7cffb5f6e8a231a041152447be8980ce35d2c9b8 (MDEV-23399).
page_id_t::fold(): Compute in the native word width instead of uint32_t.
On 64-bit platforms, an alternative would be to return the 64-bit m_id
directly, but that was measured to cause a performance regression.
fil_space_t::open(): Invoke fil_node_t::find_metadata() when the
tablespace is being created. In this way, we will actually detect
that the temporary tablespace resides on SSD. (During database
creation, also the system tablespace will correctly be detected as
residing on SSD.)
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ENCRYPTION_KEY_VERSION_INVALID in fil0crypt.cc
The test encryption.innodb-redo-nokeys did not actually test
recovery without valid keys, because due to the setting
innodb_encrypt_tables, InnoDB refused to start up at all,
without even attempting any crash recovery.
fil_ibd_load(): If the encryption key is not available,
refuse to load the file.
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Ever since commit 685d958e38b825ad9829be311f26729cccf37c46
some Perl code in the test mariabackup.huge_lsn is writing names of
non-existing files to the InnoDB redo log and testing the recovery.
We do not need any debug instrumentation to duplicate that test.
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<tablename>, old maximum was 0" during backup stage
mariabackup does not load dictionary during backup, but it loads
tablespaces, that is why fil_system.max_assigned_id is not set with
dict_check_tablespaces_and_store_max_id(). There is no sense to issue the
warning during backup.
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