buf_flush_remove(): Disable the output for now, because we
certainly do not want this after every page flush on shutdown.
It must be rate-limited somehow. There already is a timeout
extension for waiting the page cleaner to exit in
logs_empty_and_mark_files_at_shutdown().
log_write_up_to(): Use correct format.
srv_purge_should_exit(): Move the timeout extension to the
appropriate place, from one of the callers.
Use systemd EXTEND_TIMEOUT_USEC to advise systemd of progress
Move towards progress measures rather than pure time based measures.
Progress reporting at numberious shutdown/startup locations incuding:
* For innodb_fast_shutdown=0 trx_roll_must_shutdown() for rolling back incomplete transactions.
* For merging the change buffer (in srv_shutdown(bool ibuf_merge))
* For purging history, srv_do_purge
Thanks Marko for feedback and suggestions.
InnoDB always keeps all tablespaces in the fil_system cache.
The fil_system.LRU is only for closing file handles; the
fil_space_t and fil_node_t for all data files will remain
in main memory. Between startup to shutdown, they can only be
created and removed by DDL statements. Therefore, we can
let dict_table_t::space point directly to the fil_space_t.
dict_table_t::space_id: A numeric tablespace ID for the corner cases
where we do not have a tablespace. The most prominent examples are
ALTER TABLE...DISCARD TABLESPACE or a missing or corrupted file.
There are a few functional differences; most notably:
(1) DROP TABLE will delete matching .ibd and .cfg files,
even if they were not attached to the data dictionary.
(2) Some error messages will report file names instead of numeric IDs.
There still are many functions that use numeric tablespace IDs instead
of fil_space_t*, and many functions could be converted to fil_space_t
member functions. Also, Tablespace and Datafile should be merged with
fil_space_t and fil_node_t. page_id_t and buf_page_get_gen() could use
fil_space_t& instead of a numeric ID, and after moving to a single
buffer pool (MDEV-15058), buf_pool_t::page_hash could be moved to
fil_space_t::page_hash.
FilSpace: Remove. Only few calls to fil_space_acquire() will remain,
and gradually they should be removed.
mtr_t::set_named_space_id(ulint): Renamed from set_named_space(),
to prevent accidental calls to this slower function. Very few
callers remain.
fseg_create(), fsp_reserve_free_extents(): Take fil_space_t*
as a parameter instead of a space_id.
fil_space_t::rename(): Wrapper for fil_rename_tablespace_check(),
fil_name_write_rename(), fil_rename_tablespace(). Mariabackup
passes the parameter log=false; InnoDB passes log=true.
dict_mem_table_create(): Take fil_space_t* instead of space_id
as parameter.
dict_process_sys_tables_rec_and_mtr_commit(): Replace the parameter
'status' with 'bool cached'.
dict_get_and_save_data_dir_path(): Avoid copying the fil_node_t::name.
fil_ibd_open(): Return the tablespace.
fil_space_t::set_imported(): Replaces fil_space_set_imported().
truncate_t: Change many member function parameters to fil_space_t*,
and remove page_size parameters.
row_truncate_prepare(): Merge to its only caller.
row_drop_table_from_cache(): Assert that the table is persistent.
dict_create_sys_indexes_tuple(): Write SYS_INDEXES.SPACE=FIL_NULL
if the tablespace has been discarded.
row_import_update_discarded_flag(): Remove a constant parameter.
The purpose of the InnoDB buffer pool dump is to allow InnoDB to be
restarted with the same persistent data pages in the buffer pool.
The InnoDB temporary tablespace that was introduced in MariaDB 10.2.2
is always reinitialized on restart. Therefore, it does not make sense
to attempt to dump or restore any pages of the temporary tablespace.
As this is the only moderately critical fopened for writing file,
create an alternate path to use open and fdopen for non-glibc platforms
that support O_CLOEXEC (BSDs).
Tested on Linux (by modifing the GLIBC defination) to take this
alternate path:
$ cd /proc/23874
$ more fdinfo/71
pos: 0
flags: 02100001
mnt_id: 24
$ ls -la fd/71
l-wx------. 1 dan dan 64 Mar 14 13:30 fd/71 -> /dev/shm/var_auto_i7rl/mysqld.1/data/ib_buffer_pool.incomplete
As this is the only moderately critical fopened for writing file,
create an alternate path to use open and fdopen for non-glibc platforms
that support O_CLOEXEC (BSDs).
Tested on Linux (by modifing the GLIBC defination) to take this
alternate path:
$ cd /proc/23874
$ more fdinfo/71
pos: 0
flags: 02100001
mnt_id: 24
$ ls -la fd/71
l-wx------. 1 dan dan 64 Mar 14 13:30 fd/71 -> /dev/shm/var_auto_i7rl/mysqld.1/data/ib_buffer_pool.incomplete
buf_flush_page_cleaner_coordinator(): Signal the worker threads
to exit while waiting for them to exit. Apparently, signals are
sometimes lost, causing shutdown to occasionally hang when
multiple page cleaners (and buffer pool instances) are used,
that is, when innodb_buffer_pool_size is at least 1 GiB.
buf_flush_page_cleaner_close(): Merge with the only caller.
fil_space_t::atomic_write_supported: Always set this flag for
TEMPORARY TABLESPACE and during IMPORT TABLESPACE. The page
writes during these operations are by definition not crash-safe
because they are not written to the redo log.
fil_space_t::use_doublewrite(): Determine if doublewrite should
be used.
buf_dblwr_update(): Add assertions, and let the caller check whether
doublewrite buffering is desired.
buf_flush_write_block_low(): Disable the doublewrite buffer for
the temporary tablespace and for IMPORT TABLESPACE.
fil_space_set_imported(), fil_node_open_file(), fil_space_create():
Initialize or revise the space->atomic_write_supported flag.
buf_page_io_complete(), buf_flush_write_complete(): Add the parameter
dblwr, to indicate whether doublewrite was used for writes.
buf_dblwr_sync_datafiles(): Remove an unnecessary flush of
persistent tablespaces when flushing temporary tablespaces.
(Move the call to buf_dblwr_flush_buffered_writes().)
There is only one lock_sys. Allocate it statically in order to avoid
dereferencing a pointer whenever accessing it. Also, align some
members to their own cache line in order to avoid false sharing.
lock_sys_t::create(): The deferred constructor.
lock_sys_t::close(): The early destructor.
Add innodb debug system variable, innodb_buffer_pool_load_pages_abort, to test
the behaviour of innodb_buffer_pool_load_incomplete.
(innodb_buufer_pool_dump_abort_loads.test)
This status variable indicates that an innodb buffer pool load never
completed and dumping at shutdown would result in an incomplete dump file.
This status variable is set to 1 once a buffer pool loads. Upon a successful
load this status variable returns to 0.
With this status variable set, the system variable
innodb_buffer_pool_dump_at_shutdown==1 will have no effect as dumping after
an incomplete load will generate a less complete dump file than the current
one.
If a user aborts a buffer pool load by changing the system variable
innodb_buffer_pool_load_abort=1 will cause the the status variable
innodb_buffer_pool_load_incomplete to remain set to 1.
A shutdown that occurs while innodb is loading the buffer pool will
not save the buffer pool on shutdown.
A user may indirectly set innodb_buffer_pool_load_incomplete
to 0 by:
* Forcing a load, by setting innodb_buffer_pool_load_now=ON, or
* Forcing a dump, by setting innodb_buffer_pool_dump_now=ON
This will enable the next dump on shutdown to complete.
Signed-off-by: Daniel Black <daniel.black@au.ibm.com>
Note: Linux only
Core dumps of large buffer pool pages take time and space
and pose potential data expose in scenarios where data-at-rest
encryption is deployed.
Here we use madvise(MADV_DONT_DUMP) on large memory allocations
used by the innodb buffer pool, log_sys and recv_sys. The effect
of this system call is that these memory areas will not appear in
a core dump. Data from these buffers is rarely useful in fault
diagnosis.
log_sys and recv_sys structures now use large memory allocations
for their large buffer.
Debug builds don't include the madvise syscall and as such will
include full core dumps.
A function, buf_madvise_do_dump, is added but never called. It
is there to be called from a debugger to re-enable the core
dumping of all of these pages if for some reason the entire
contents of these buffers are needed.
Idea thanks to Hartmut Holzgraefe
Before that line there is call to buf_page_get_gen that could
return block = NULL when decrypting a page fails. However,
we should set error to be != DB_SUCCESS also. In error log
there was error about decompression but in that code there
is one case where error is not set correctly.
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.
Import and adjust the innodb.innodb_buffer_pool_resize tests,
except innodb.innodb_buffer_pool_resize_debug, which would time out.
buf_pool_clear_hash_index(): Adjust assertions.
While the bug was reported as a regression of
MDEV-11025 Make number of page cleaner threads variable dynamic
in MariaDB Server 10.3, the code that MariaDB Server 10.2
inherited from MySQL 5.7.4 (WL#6642) looks prone to similar errors.
pc_flush_slot(): If there is no work to do, reset the is_requested
signal, to avoid potential busy-waiting in
buf_flush_page_cleaner_worker(). If the coordinator thread has shut
down, avoid resetting the is_requested event, to avoid a potential
hang at shutdown if there are multiple worker threads.
mem_heap_free_heap_top(): Remove UNIV_MEM_ASSERT_W() and unpoison
the memory region first, because part of it may have been poisoned
by an earlier mem_heap_free_top() call.
Poison the address range at the end.
mem_heap_block_free(): Poison the address range at the end.
UNIV_MEM_ASSERT_AND_ALLOC(): Replace with UNIV_MEM_ALLOC().
We want to keep the address ranges poisoned (unaccessible) as
long as possible.
UNIV_MEM_ASSERT_AND_FREE(): Replace with UNIV_MEM_FREE().
There is only one transaction system object in InnoDB.
Allocate the storage for it at link time, not at runtime.
lock_rec_fetch_page(): Use the correct fetch mode BUF_GET.
Pages may never be deallocated from a tablespace while
record locks are pointing to them.
