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0b47c126e3
The approach to handling corruption that was chosen by Oracle in
commit 177d8b0c12
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.
70 lines
3.6 KiB
Plaintext
70 lines
3.6 KiB
Plaintext
call mtr.add_suppression("InnoDB: Table `test`\\.`t1` (has an unreadable root page|is corrupted|does not exist.*is trying to rename)");
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call mtr.add_suppression("InnoDB: The page \\[page id: space=[1-9][0-9]*, page number=[1-9][0-9]*\\] in file '.*test.t1(new)?\\.ibd' cannot be decrypted; key_version=1");
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call mtr.add_suppression("failed to read or decrypt \\[page id: space=[1-9][0-9]*, page number=[1-9][0-9]*\\]");
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call mtr.add_suppression("Couldn't load plugins from 'file_key_management");
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call mtr.add_suppression("InnoDB: Tablespace for table \`test\`.\`t1\` is set as discarded\\.");
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call mtr.add_suppression("InnoDB: Table `test`\\.`t1` is corrupted");
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call mtr.add_suppression("InnoDB: Cannot delete tablespace .* because it is not found in the tablespace memory cache");
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call mtr.add_suppression("InnoDB: ALTER TABLE `test`\\.`t1` DISCARD TABLESPACE failed to find tablespace");
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call mtr.add_suppression("\\[ERROR\\] InnoDB: Cannot decrypt \\[page id: space=");
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# restart: --plugin-load-add=file_key_management --file-key-management --file-key-management-filename=MYSQL_TEST_DIR/std_data/keys2.txt
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SET GLOBAL innodb_file_per_table = ON;
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CREATE TABLE t1 (pk INT PRIMARY KEY, f VARCHAR(8)) ENGINE=InnoDB
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ENCRYPTED=YES ENCRYPTION_KEY_ID=4;
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INSERT INTO t1 VALUES (1,'foo'),(2,'bar');
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# restart: --plugin-load-add=file_key_management --file-key-management --file-key-management-filename=MYSQL_TEST_DIR/std_data/keys3.txt
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SELECT * FROM t1;
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ERROR 42S02: Table 'test.t1' doesn't exist in engine
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SHOW WARNINGS;
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Level Code Message
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Error 1932 Table 'test.t1' doesn't exist in engine
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ALTER TABLE t1 ENGINE=InnoDB;
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ERROR 42S02: Table 'test.t1' doesn't exist in engine
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SHOW WARNINGS;
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Level Code Message
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Error 1932 Table 'test.t1' doesn't exist in engine
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OPTIMIZE TABLE t1;
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Table Op Msg_type Msg_text
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test.t1 optimize Error Table 'test.t1' doesn't exist in engine
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test.t1 optimize status Operation failed
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SHOW WARNINGS;
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Level Code Message
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CHECK TABLE t1;
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Table Op Msg_type Msg_text
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test.t1 check Error Table 'test.t1' doesn't exist in engine
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test.t1 check status Operation failed
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SHOW WARNINGS;
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Level Code Message
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# restart: --plugin-load-add=file_key_management --file-key-management --file-key-management-filename=MYSQL_TEST_DIR/std_data/keys2.txt
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FLUSH TABLES t1 FOR EXPORT;
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backup: t1
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UNLOCK TABLES;
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# restart: --plugin-load-add=file_key_management --file-key-management --file-key-management-filename=MYSQL_TEST_DIR/std_data/keys3.txt
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ALTER TABLE t1 DISCARD TABLESPACE;
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ERROR 42S02: Table 'test.t1' doesn't exist in engine
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DROP TABLE t1;
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CREATE TABLE t1 (pk INT PRIMARY KEY, f VARCHAR(8)) ENGINE=InnoDB
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ENCRYPTED=YES ENCRYPTION_KEY_ID=4;
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ALTER TABLE t1 DISCARD TABLESPACE;
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restore: t1 .ibd and .cfg files
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# restart: --plugin-load-add=file_key_management --file-key-management --file-key-management-filename=MYSQL_TEST_DIR/std_data/keys2.txt
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ALTER TABLE t1 DISCARD TABLESPACE;
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Warnings:
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Warning 1814 Tablespace has been discarded for table `t1`
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Warning 1812 Tablespace is missing for table 'test/t1'
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restore: t1 .ibd and .cfg files
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ALTER TABLE t1 IMPORT TABLESPACE;
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SHOW CREATE TABLE t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`pk` int(11) NOT NULL,
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`f` varchar(8) DEFAULT NULL,
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PRIMARY KEY (`pk`)
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) ENGINE=InnoDB DEFAULT CHARSET=latin1 `ENCRYPTED`=YES `ENCRYPTION_KEY_ID`=4
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# restart: --innodb-encrypt-tables --plugin-load-add=file_key_management --file-key-management --file-key-management-filename=MYSQL_TEST_DIR/std_data/keys3.txt
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RENAME TABLE t1 TO t1new;
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ERROR HY000: Error on rename of './test/t1' to './test/t1new' (errno: 155 "The table does not exist in the storage engine")
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ALTER TABLE t1 RENAME TO t1new;
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ERROR 42S02: Table 'test.t1' doesn't exist in engine
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DROP TABLE t1;
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