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MDEV-20578 Got error 126 when executing undo undo_key_delete
upon Aria crash recovery
The crash happens in this scenario:
- Table with unique keys and non unique keys
- Batch insert (LOAD DATA or INSERT ... SELECT) with REPLACE
- Some insert succeeds followed by duplicate key error
In the above scenario the table gets corrupted.
The bug was that we don't generate any undo entry for the
failed insert as the whole insert can be ignored by undo.
The code did however not take into account that when bulk
insert is used, we would write cached keys to the file on
failure and undo would wrongly ignore these.
Fixed by moving the writing of the cache keys after we write
the aborted-insert event to the log.
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- Remove extra ',' and quotes
- Remove extra newline and remove double newlines
- Added options --lsn-redo-end and --lsn-undo-end to aria_read_log
- Allow one to give the aria_read_log lsn aruments as number,0xhexnumber,
the same way as lsn's are written by aria_read_log
- Don't write full pages to redo log with EXTRA_DEBUG as this takes up
a lot of disk and there has not been a need for this extra loggging for
a long time. Instead one should use EXTRA_ARIA_DEBUG instead.
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When my_vsnprintf() is patched, the code protected disabled with
'WAITING_FOR_BUGFIX_TO_VSPRINTF' should be enabled again. Also all %b
formats in this patch should be revert to %s again
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This can happen if one uses a backup where not all aria_log.* files
are copied or if the last one is too short. In this case the data
files will contain data that is not in the logs and recovery will fail.
Other things:
- Fixed tprint() to not print extra new line to debug trace
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- When recovery failed, errors would not be printed on
new lines.
- Print more information if file lengths are changed
- Added logging of table name for entries INCOMPLETE_LOG and
REDO_REPAIR_TABLE
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This helps when merging code between releases
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This commit is based on the work of Michal Schorm, rebased on the
earliest MariaDB version.
Th command line used to generate this diff was:
find ./ -type f \
-exec sed -i -e 's/Foundation, Inc., 59 Temple Place, Suite 330, Boston, /Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, /g' {} \; \
-exec sed -i -e 's/Foundation, Inc. 59 Temple Place.* Suite 330, Boston, /Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, /g' {} \; \
-exec sed -i -e 's/MA.*.....-1307.*USA/MA 02110-1335 USA/g' {} \; \
-exec sed -i -e 's/Foundation, Inc., 59 Temple/Foundation, Inc., 51 Franklin/g' {} \; \
-exec sed -i -e 's/Place, Suite 330, Boston, MA.*02111-1307.*USA/Street, Fifth Floor, Boston, MA 02110-1335 USA/g' {} \; \
-exec sed -i -e 's/MA.*.....-1307/MA 02110-1335/g' {} \;
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A read-only storage engine that stores it's data in (aws) S3
To store data in S3 one could use ALTER TABLE:
ALTER TABLE table_name ENGINE=S3
libmarias3 integration done by Sergei Golubchik
libmarias3 created by Andrew Hutchings
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The MDEV-17262 commit 26432e49d37a37d09b862bb49a021e44bdf4789c
was skipped. In Galera 4, the implementation would seem to require
changes to the streaming replication.
In the tests archive.rnd_pos main.profiling, disable_ps_protocol
for SHOW STATUS and SHOW PROFILE commands until MDEV-18974
has been fixed.
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The symptom of the bug was that one got the following in
the aria recovery log:
"Table 'xxx', id 57, has create_rename_lsn (1,0x12dee) more recent than LOGREC_FILE_ID's LSN (1,0x12dc4), ignoring open request"
After this all future redo entries was marked with
"For table of short id 57, table skipped, so skipping record"
Analyze:
When ending batch insert, create_rename_lsn for the table
is updated to signal that earlier redo entries for the
table can't be applied. The problem was that future redo
entries was also ignored as redo code assumed they where
for the old table.
Fixed by calling translog_dessign_id, which causes
future redo entries to be seen as belonging to the
updated table.
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The warning was removed as this is a common case that happens if the table
was dropped and later created during the same checkpoint or if there was
a bulk insert done on an empty table.
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This caused ma_test_recovery.pl to fail
Other things:
- Fixed bug where "ma_test_recovert.pl --abort-on-error" didn't abort
on error
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Problem was that a parallel open of a table, overwrote info->state that
was in used by repair.
Fixed by changing _ma_tmp_disable_logging_for_table() to use
a new state buffer state.no_logging to store the temporary state.
Other things:
- Use original number of rows when retrying repair to get rid of a
potential warning "Number of rows changed from X to Y"
- Changed maria_commit() to make it easier to merge with 10.4
- If table is not locked (like with show commands), use the global
number of rows as the local number may not be up to date.
(Minor not critical fix)
- Added some missing DBUG_RETURN
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- Made output to be aligned in aria_chk -d
- Aria engine error texts are now written instead of "Undefined error"
- When running with --check --force, tables with wrong TRN's but otherwise
correct are now zerofilled
- Fixed several bugs in check and recovery related to fulltext
- When doing recovery, store highest found TRID in aria_control_file
Before this, the
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Make all system tables in mysql directory of type
engine=Aria
Privilege tables are using transactional=1
Statistical tables are using transactional=0, to allow them
to be quickly updated with low overhead.
Help tables are also using transactional=0 as these are only
updated at init time.
Other changes:
- Aria store engine is now a required engine
- Update comment for Aria tables to reflect their new usage
- Fixed that _ma_reset_trn_for_table() removes unlocked table
from transaction table list. This was needed to allow one
to lock and unlock system tables separately from other
tables, for example when reading a procedure from mysql.proc
- Don't give a warning when using transactional=1 for engines
that is using transactions. This is both logical and also
to avoid warnings/errors when doing an alter of a privilege
table to InnoDB.
- Don't abort on warnings from ALTER TABLE for changes that
would be accepted by CREATE TABLE.
- New created Aria transactional tables are marked as not movable
(as they include create_rename_lsn).
- bootstrap.test was changed to kill orignal server, as one
can't anymore have two servers started at same time on same
data directory and data files.
- Disable maria.small_blocksize as one can't anymore change
aria block size after system tables are created.
- Speed up creation of help tables by using lock tables.
- wsrep_sst_resync now also copies Aria redo logs.
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on concurrent workload with Aria tables
Problem was that we the bitmap needs to be flushed before disabling
logging of redo entires, as writing the bitmap to disk by
background checkpoint may cause redo entries.
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Problem was that if copy_data_between_tables() didn't do proper
clean up in case of failures:
- copy object was not properly freed
- end_bulk_insert() was not called
- mysql_trans_prepare_alter_copy_data() set THD->transaction.on to
false which was not properly restored
The last part caused a crash in Aria as Aria depends on that THD
is correct.
Other things:
- Reset info->switched_transactional after usage (safety)
- Reset bulk_insert_single_undo (safety)
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on concurrent workload with Aria tables
I was able to repeat the problem with old version of randgen
Reason for crash:
- It's not safe to change share->now_transactional if there are changed
bitmaps in the pagecache as flushing these can cause redo-entries and
the bitmap flush code checks that share->now_transactional is set.
Fixed by flushing bitmaps in _ma_tmp_disable_logging_for_table() before
we set share->now_transactional to 0
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'size_t' to 'type', possible loss of data)
Handle string length as size_t, consistently (almost always:))
Change function prototypes to accept size_t, where in the past
ulong or uint were used. change local/member variables to size_t
when appropriate.
This fix excludes rocksdb, spider,spider, sphinx and connect for now.
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mostly caused by -Wimplicit-fallthrough
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