When attempting to rename a table to a non-existing database,
InnoDB would misleadingly report "OS error 71" when in fact the
error code is InnoDB's own (OS_FILE_NOT_FOUND), and not report
both pathnames. Errors on rename could occur due to reasons
connected to either pathname.
os_file_handle_rename_error(): New function, to report errors in
renaming files.
When attempting to rename a table to a non-existing database,
InnoDB would misleadingly report "OS error 71" when in fact the
error code is InnoDB's own (OS_FILE_NOT_FOUND), and not report
both pathnames. Errors on rename could occur due to reasons
connected to either pathname.
os_file_handle_rename_error(): New function, to report errors in
renaming files.
ha_innobase::optimize(): If both innodb_defragment and
innodb_optimize_fulltext_only are at their default settings (OFF),
fall back to ALTER TABLE. Else process one or both options.
When the transaction isolation level is SERIALIZABLE, or when
a locking read is performed in the REPEATABLE READ isolation level,
InnoDB must lock delete-marked records in order to prevent another
transaction from inserting something.
However, at READ UNCOMMITTED or READ COMMITTED isolation level or
when the parameter innodb_locks_unsafe_for_binlog is set, the
repeatability of the reads does not matter, and there is no need
to lock any records.
row_search_for_mysql(): Skip locks on delete-marked committed records
upfront, instead of invoking row_unlock_for_mysql() afterwards.
The unlocking never worked for secondary index records.
InnoDB does not allow FOREIGN KEY constraints to exist for TEMPORARY TABLE.
InnoDB introduced a dedicated tablespace for temporary tables, and actually
stopped creating persistent metadata and data for temporary tables.
row_table_add_foreign_constraints(): Do not create a persistent
transaction.
dict_create_foreign_constraints_low(): Add the persistent transaction to
the update the foreign key relation in dictionary.
dict_create_foreign_constraints_low(): Remove a duplicated check for
partitioned tables.
Problem:
We keep pinning pages in dict_stats_analyze_index_below_cur(),
but doesn't release these pages. When we have a relative small
buffer pool size, and big innodb_stats_persistent_sample_pages,
there will be no free pages for use.
Solution:
Use a separate mtr in dict_stats_analyze_index_below_cur(),
and commit mtr before return.
Reviewed-by: Jimmy Yang <jimmy.yang@oracle.com>
RB: 11362
In debug builds of MySQL, there is an configuration variable
that allows an InnoDB log checkpoint to be initiated:
SET GLOBAL innodb_log_checkpoint_now=ON;
Setting this variable while a table-rebuilding ALTER TABLE is executing
may result in an infinite loop.
checkpoint_now_set(): Account for log_sys->append_on_checkpoint->size().
Note that this function contains race conditions, because it is accessing
fields of log_sys without holding log_sys->mutex. We think that this is
acceptable, because this variable only exists for debugging purposes, in
debug builds of MySQL.
RB: 9947
Reviewed-by: Sunny Bains <sunny.bains@oracle.com>
Problem:
The function row_build_index_entry_low() takes a dtuple_t object ('row') and
dict_index_t object ('index') as input and returns a new dtuple_t object
('entry') as output. The dtuple_t object 'row' that is given as input might
have been constructed from a different dict_index_t object (!= index). So
when accessing the externally stored data of the given 'row' we need to make
use of the correct index object.
Solution:
Store the page size information in the associated row_ext_t object.
rb#6086 approved by Vasil and Jimmy.
Problem:
Suppose there are two tables in the database related through a foreign key
constraint - the parent table and the child table. Suppose there is an ALTER
TABLE on the child table which gets interrupted in such a way that the child
table is not available any more.
After crash recovery, an ALTER TABLE on the parent table identifies that its
foreign keys cannot be loaded. This results in an error and a debug assert.
Solution:
Remove the debug assert and change error to a warning.
rb#8658 approved by Marko.
The server crashes on a SELECT because of space id mismatch. The
mismatch happens if the server crashes during an ALTER TABLE.
There are actually two cases of inconsistency, and three fixes needed
for the InnoDB problems.
We have dictionary data (tablespace or table name) in 3 places:
(a) The *.frm file is for the old table definition.
(b) The InnoDB data dictionary is for the new table definition.
(c) The file system did not rename the tablespace files yet.
In this fix, we will not care if the *.frm file is in sync with the
InnoDB data dictionary and file system. We will concentrate on the
mismatch between (b) and (c).
Two scenarios have been mentioned in this bug report. The simpler one
first:
1. The changes to SYS_TABLES were committed, and MLOG_FILE_RENAME2
records were written in a single mini-transaction commit.
The files were not yet renamed in the file system.
2a. The server is killed, without making a log checkpoint.
3a. The server refuses to start up, because replaying MLOG_FILE_RENAME2
fails.
I failed to repeat this myself. I repeated step 3a with a saved
dataset. The problem seems to be that MLOG_FILE_RENAME2 replay is
incorrectly being skipped when there is no page-redo log or
MLOG_FILE_NAME record for the old name of the tablespace.
FIX#1: Recover the id-to-name mapping also from MLOG_FILE_RENAME2
records when scanning the redo log. It is not necessary to write
MLOG_FILE_NAME records in addition to MLOG_FILE_RENAME2 records for
renaming tablespace files.
The scenario in the original Description involves a log checkpoint:
1. The changes to SYS_TABLES were committed, and MLOG_FILE_RENAME2
records were written in a single mini-transaction commit.
2. A log checkpoint and a server kill was injected.
3. Crash recovery will see no records (other than the MLOG_CHECKPOINT).
4. dict_check_tablespaces_and_store_max_id() will emit a message about
a non-found table #sql-ib22*.
5. A mismatch is triggering the assertion failure.
In my test, at step 4 the SYS_TABLES root page (0:8) contains these 3
records right before the page supremum:
* delete-marked (committed) name=#sql-ib21* record, with space=10.
* name=#sql-ib22*, space=9.
* name=t1, space=10.
space=10 is the rebuilt table (#sql-ib21*.ibd in the file system).
space=9 is the old table (t1.ibd in the file system).
The function dict_check_tablespaces_and_store_max_id() will enter
t1.ibd with space_id=10 into the fil_system cache without noticing
that t1.ibd contains space_id=9, because it invokes
fil_open_single_table_tablespace() with validate=false.
In MySQL 5.6, the space_id from all *.ibd files are being read when
the redo log checkpoint LSN disagrees with the FIL_PAGE_FILE_FLUSH_LSN
in the system tablespace. This field is only updated during a clean
shutdown, after performing the final log checkpoint.
FIX#2: dict_check_tablespaces_and_store_max_id() should pass
validate=true to fil_open_single_table_tablespace() when a non-clean
shutdown is detected, forcing the first page of each *.ibd file to be
read. (We do not want to slow down startup after a normal shutdown.)
With FIX#2, the SELECT would fail to find the table. This would
introduce a regression, because before WL#7142, a copy of the table
was accessible after recovery.
FIX#3: Maintain a list of MLOG_FILE_RENAME2 records that have been
written to the redo log, but not performed yet in the file system.
When performing a checkpoint, re-emit these records to the redo
log. In this way, a mismatch between (b) and (c) should be impossible.
fil_name_process(): Refactored from fil_name_parse(). Adds an item to
the id-to-filename mapping.
fil_name_parse(): Parses and applies a MLOG_FILE_NAME,
MLOG_FILE_DELETE or MLOG_FILE_RENAME2 record. This implements FIX#1.
fil_name_write_rename(): A wrapper function for writing
MLOG_FILE_RENAME2 records.
fil_op_replay_rename(): Apply MLOG_FILE_RENAME2 records. Replaces
fil_op_log_parse_or_replay(), whose logic was moved to fil_name_parse().
fil_tablespace_exists_in_mem(): Return fil_space_t* instead of bool.
dict_check_tablespaces_and_store_max_id(): Add the parameter
"validate" to implement FIX#2.
log_sys->append_on_checkpoint: Extra log records to append in case of
a checkpoint. Needed for FIX#3.
log_append_on_checkpoint(): New function, to update
log_sys->append_on_checkpoint.
mtr_write_log(): New function, to append mtr_buf_t to the redo log.
fil_names_clear(): Append the data from log_sys->append_on_checkpoint
if needed.
ha_innobase::commit_inplace_alter_table(): Add any MLOG_FILE_RENAME2
records to log_sys->append_on_checkpoint(), and remove them once the
files have been renamed in the file system.
mtr_buf_copy_t: A helper functor for copying a mini-transaction log.
rb#6282 approved by Jimmy Yang
Problem:
when incorrect value is assigned to innodb_data_file_path or
innodb_temp_data_file_path parameter, Innodb returns error and logs error
message in mysqlds.err file but there is no information in error message about
the parameter which causes Innodb initialization is failed.
Fix:
Added error message with parameter name and value, which causes Innodb
initialization is failed.
Reviewed by: Jimmy <Jimmy.Yang@oracle.com>
RB: 18206
Problem:
During ALTER, when filling stored column info, wrong column number is used.
This is because we ignored virtual column when iterating over columns in
table and lead to debug assertion.
Fix:
In InnoDB table cache object, vcols are on stored on one list, stored and
normal columns are stored in another list.
When looking for stored column, ignore the virtual columns to get the right
column number of stored column.
Reviewed by: Thiru <thirunarayanan.balathandayuth@oracle.com>,
Satya <satya.bodapati@oracle.com>
RB: 17939
This is the MariaDB equivalent of fixing the MySQL 5.7 regression
Bug #26935001 ALTER TABLE AUTO_INCREMENT TRIES TO READ
INDEX FROM DISCARDED TABLESPACE
Oracle did not publish a test case, but it is easy to guess
based on the commit message. The MariaDB code is different
due to MDEV-6076 implementing persistent AUTO_INCREMENT.
commit_set_autoinc(): Report ER_TABLESPACE_DISCARDED if the
tablespace is missing.
prepare_inplace_alter_table_dict(): Avoid accessing a discarded
tablespace. (This avoids generating warnings in fil_space_acquire().)
Problem:
When FTS index is added into a table which doesn't have 'FTS_DOC_ID'
column, Innodb rebuilds table to add column 'FTS_DOC_ID'. when this FTS
index is dropped from this table. Innodb doesn't not rebuild table to
remove 'FTS_DOC_ID' column and deletes FTS index auxiliary tables.
But it doesn't delete FTS common auxiliary tables.
Later when the database having this table is renamed, FTS auxiliary
tables are not renamed because table's flags2 (dict_table_t.flags2)
has been resetted for DICT_TF2_FTS flag during FTS index drop operation.
Now when we drop old database, it leads to an assert.
Fix:
During renaming of FTS auxiliary tables, ORed a condition to check if
table has DICT_TF2_FTS_HAS_DOC_ID flag set.
RB: 18769
Reviewed by : Jimmy.Yang@oracle.com
If creating a secondary index fails (typically, ADD UNIQUE INDEX fails
due to duplicate key), it is possible that concurrently running UPDATE
or DELETE will access the index stub and hit the debug assertion.
It does not make any sense to keep updating an uncommitted index whose
creation has failed.
dict_index_t::is_corrupted(): Replaces dict_index_is_corrupted().
Also take online_status into account.
Replace some calls to dict_index_is_clust() with calls to
dict_index_t::is_primary().
Introduced new alter algorithm type called NOCOPY & INSTANT for
inplace alter operation.
NOCOPY - Algorithm refuses any alter operation that would
rebuild the clustered index. It is a subset of INPLACE algorithm.
INSTANT - Algorithm allow any alter operation that would
modify only meta data. It is a subset of NOCOPY algorithm.
Introduce new variable called alter_algorithm. The values are
DEFAULT(0), COPY(1), INPLACE(2), NOCOPY(3), INSTANT(4)
Message to deprecate old_alter_table variable and make it alias
for alter_algorithm variable.
alter_algorithm variable for slave is always set to default.
ha_innobase::commit_inplace_alter_table(): Defer the freeing of ctx->trx
until after the operation has been successfully committed. In this way,
rollback on a partitioned table will be possible.
rollback_inplace_alter_table(): Handle ctx->new_table == NULL when
ctx->trx != NULL.
The number of records in INFORMATION_SCHEMA.COLUMNS depends on the
build options, and could easily change when features are added.
We are not interested in the number of rows returned. The test was
originally added because of problem 15 reported in MDEV-13900
(testing for MDEV-11369 instant ADD COLUMN). The issue was an
assertion failure ut_ad(!rec_is_default_row(rec, index))
in lock_clust_rec_cons_read_sees(), because the 'default row' record
was not being properly ignored by the b-tree cursor.
During an online table rebuild, a table could be emptied and converted
from 'instant ADD' format to plain (pre-10.3) format. All online_log
records for rebuilding the table must be written and parsed in the
format of the table that existed at the start of the operation.
row_log_t::n_core_fields: A new field for recording index->n_core_fields
when online ALTER is initiated in row_log_allocate().
row_log_t::is_instant(): Determine if the log is in the instant format.
Only invoked by the row_log_table_ family of functions.
dict_index_t::get_n_nullable(): Remove is_instant() debug assertions.
Because a table can be converted to non-instant format during a
table-rebuilding ALTER TABLE, these assertions would be bogus when
executing row_log_table_apply().
rec_init_offsets_temp(): Add the parameter n_core for passing the
original index->n_core_fields.
rec_init_offsets_temp(): Add a 3-parameter variant.
rec_init_offsets_comp_ordinary(): Add the parameter n_core for
passing the index->n_core_fields.
