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- WL#3072 Maria Recovery:

Browse source 
Recovery of state.records (the count of records which is stored into
the header of the index file). For that, state.is_of_lsn is introduced;
logic is explained in ma_recovery.c (look for "Recovery of the state").
The net gain is that in case of crash, we now recover state.records,
and it is idempotent (ma_test_recovery tests it).
state.checksum is not recovered yet, mail sent for discussion.
- WL#3071 Maria Checkpoint: preparation for it, by protecting
all modifications of the state in memory or on disk with intern_lock
(with the exception of the really-often-modified state.records,
which is now protected with the log's lock, see ma_recovery.c
(look for "Recovery of the state"). Also, if maria_close() sees that
Checkpoint is looking at this table it will not my_free() the share.
- don't compute row's checksum twice in case of UPDATE (correction
to a bugfix I made yesterday).


storage/maria/ha_maria.cc:
  protect state write with intern_lock (against Checkpoint)
storage/maria/ma_blockrec.c:
  * don't reset trn->rec_lsn in _ma_unpin_all_pages(), because it
  should wait until we have corrected the allocation in the bitmap
  (as the REDO can serve to correct the allocation during Recovery);
  introducing _ma_finalize_row() for that.
  * In a changeset yesterday I moved computation of the checksum
  into write_block_record(), to fix a bug in UPDATE. Now I notice
  that maria_update() already computes the checksum, it's just that
  it puts it into info->cur_row while _ma_update_block_record()
  uses info->new_row; so, removing the checksum computation from
  write_block_record(), putting it back into allocate_and_write_block_record()
  (which is called only by INSERT and UNDO_DELETE), and copying
  cur_row->checksum into new_row->checksum in _ma_update_block_record().
storage/maria/ma_check.c:
  new prototypes, they will take intern_lock when writing the state;
  also take intern_lock when changing share->kfile. In both cases
  this is to protect against Checkpoint reading/writing the state or reading
  kfile at the same time.
  Not updating create_rename_lsn directly at end of write_log_record_for_repair()
  as it wouldn't have intern_lock.
storage/maria/ma_close.c:
  Checkpoint builds a list of shares (under THR_LOCK_maria), then it
  handles each such share (under intern_lock) (doing flushing etc);
  if maria_close() freed this share between the two, Checkpoint
  would see a bad pointer. To avoid this, when building the list Checkpoint
  marks each share, so that maria_close() knows it should not free it
  and Checkpoint will free it itself.
  Extending the zone covered by intern_lock to protect against
  Checkpoint reading kfile, writing state.
storage/maria/ma_create.c:
  When we update create_rename_lsn, we also update is_of_lsn to
  the same value: it is logical, and allows us to test in maria_open()
  that the former is not bigger than the latter (the contrary is a sign
  of index header corruption, or severe logging bug which hinders
  Recovery, table needs a repair).
  _ma_update_create_rename_lsn_on_disk() also writes is_of_lsn;
  it now operates under intern_lock (protect against Checkpoint),
  a shortcut function is available for cases where acquiring
  intern_lock is not needed (table's creation or first open).
storage/maria/ma_delete.c:
  if table is transactional, "records" is already decremented
  when logging UNDO_ROW_DELETE.
storage/maria/ma_delete_all.c:
  comments
storage/maria/ma_extra.c:
  Protect modifications of the state, in memory and/or on disk,
  with intern_lock, against a concurrent Checkpoint.
  When state goes to disk, update it's is_of_lsn (by calling
  the new _ma_state_info_write()).
  In HA_EXTRA_FORCE_REOPEN, don't set share->changed to 0 (undoing
  a change I made a few days ago) and ASK_MONTY
storage/maria/ma_locking.c:
  no real code change here.
storage/maria/ma_loghandler.c:
  Log-write-hooks for updating "state.records" under log's mutex
  when writing/updating/deleting a row or deleting all rows.
storage/maria/ma_loghandler_lsn.h:
  merge (make LSN_ERROR and LSN_REPAIRED_BY_MARIA_CHK different)
storage/maria/ma_open.c:
  When opening a table verify that is_of_lsn >= create_rename_lsn; if
  false the header must be corrupted.
  _ma_state_info_write() is split in two: _ma_state_info_write_sub()
  which is the old _ma_state_info_write(), and _ma_state_info_write()
  which additionally takes intern_lock if requested (to protect
  against Checkpoint) and updates is_of_lsn.
  _ma_open_keyfile() should change kfile.file under intern_lock
  to protect Checkpoint from reading a wrong kfile.file.
storage/maria/ma_recovery.c:
  Recovery of state.records: when the REDO phase sees UNDO_ROW_INSERT
  which has a LSN > state.is_of_lsn it increments state.records.
  Same for UNDO_ROW_DELETE and UNDO_ROW_PURGE.
  When closing a table during Recovery, we know its state is at least
  as new as the current log record we are looking at, so increase
  is_of_lsn to the LSN of the current log record.
storage/maria/ma_rename.c:
  update for new behaviour of _ma_update_create_rename_lsn_on_disk().
storage/maria/ma_test1.c:
  update to new prototype
storage/maria/ma_test2.c:
  update to new prototype (actually prototype was changed days ago,
  but compiler does not complain about the extra argument??)
storage/maria/ma_test_recovery.expected:
  new result file of ma_test_recovery. Improvements: record
  count read from index's header is now always correct.
storage/maria/ma_test_recovery:
  "rm" fails if file does not exist. Redirect stderr of script.
storage/maria/ma_write.c:
  if table is transactional, "records" is already incremented when
  logging UNDO_ROW_INSERT. Comments.
storage/maria/maria_chk.c:
  update is_of_lsn too
storage/maria/maria_def.h:
  - MARIA_STATE_INFO::is_of_lsn which is used by Recovery. It is stored
  into the index file's header.
  - Checkpoint can now mark a table as "don't free this", and maria_close()
  can reply "ok then you will free it".
  - new functions
storage/maria/maria_pack.c:
  update for new name
This commit is contained in:
unknown 2007-09-07 15:02:30 +02:00
commit 2291f932b2
22 changed files with 516 additions and 215 deletions
Download patch file Download diff file Expand all files Collapse all files

43
storage/maria/ma_close.c
View file

@ -25,6 +25,7 @@
int maria_close(register MARIA_HA *info)
{
int error=0,flag;
my_bool share_can_be_freed= FALSE;
MARIA_SHARE *share=info->s;
DBUG_ENTER("maria_close");
DBUG_PRINT("enter",("base: 0x%lx reopen: %u locks: %u",
@ -58,7 +59,6 @@ int maria_close(register MARIA_HA *info)
}
flag= !--share->reopen;
maria_open_list=list_delete(maria_open_list,&info->open_list);
pthread_mutex_unlock(&share->intern_lock);
my_free(info->rec_buff, MYF(MY_ALLOW_ZERO_PTR));
(*share->end)(info);
@ -90,20 +90,23 @@ int maria_close(register MARIA_HA *info)
(share->mode != O_RDONLY && maria_is_crashed(info)))
{
/*
File must be synced as it is going out of the maria_open_list and so
becoming unknown to Checkpoint. State must be written to file as
it was not done at table's unlocking.
State must be written to file as it was not done at table's
unlocking.
*/
if (_ma_state_info_write(share->kfile.file, &share->state, 1) ||
my_sync(share->kfile.file, MYF(MY_WME)))
if (_ma_state_info_write(share, 1))
error= my_errno;
}
/*
File must be synced as it is going out of the maria_open_list and so
becoming unknown to future Checkpoints.
*/
if (my_sync(share->kfile.file, MYF(MY_WME)))
error= my_errno;
if (my_close(share->kfile.file, MYF(0)))
error= my_errno;
}
#ifdef THREAD
thr_lock_delete(&share->lock);
VOID(pthread_mutex_destroy(&share->intern_lock));
{
int i,keys;
keys = share->state.header.keys;
@ -114,16 +117,36 @@ int maria_close(register MARIA_HA *info)
}
#endif
DBUG_ASSERT(share->now_transactional == share->base.born_transactional);
my_free((uchar*) share, MYF(0));
if (share->in_checkpoint == MARIA_CHECKPOINT_LOOKS_AT_ME)
{
share->kfile.file= -1; /* because Checkpoint does not need to flush */
/* we cannot my_free() the share, Checkpoint would see a bad pointer */
share->in_checkpoint|= MARIA_CHECKPOINT_SHOULD_FREE_ME;
}
else
share_can_be_freed= TRUE;
}
pthread_mutex_unlock(&THR_LOCK_maria);
pthread_mutex_unlock(&share->intern_lock);
if (share_can_be_freed)
{
VOID(pthread_mutex_destroy(&share->intern_lock));
my_free((uchar *)share, MYF(0));
}
if (info->ftparser_param)
{
my_free((uchar*)info->ftparser_param, MYF(0));
info->ftparser_param= 0;
}
if (info->dfile.file >= 0 && my_close(info->dfile.file, MYF(0)))
error = my_errno;
if (info->dfile.file >= 0)
{
/*
This is outside of mutex so would confuse a concurrent
Checkpoint. Fortunately in BLOCK_RECORD we close earlier under mutex.
*/
if (my_close(info->dfile.file, MYF(0)))
error = my_errno;
}
my_free((uchar*) info,MYF(0));