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Files
mariadb/sql/debug_sync.h
Monty 47010ccffa MDEV-23842 Atomic RENAME TABLE
- Major rewrite of ddl_log.cc and ddl_log.h
  - ddl_log.cc described in the beginning how the recovery works.
  - ddl_log.log has unique signature and is dynamic. It's easy to
    add more information to the header and other ddl blocks while still
    being able to execute old ddl entries.
  - IO_SIZE for ddl blocks is now dynamic. Can be changed without affecting
    recovery of old logs.
  - Code is more modular and is now usable outside of partition handling.
  - Renamed log file to dll_recovery.log and added option --log-ddl-recovery
    to allow one to specify the path & filename.
- Added ddl_log_entry_phase[], number of phases for each DDL action,
  which allowed me to greatly simply set_global_from_ddl_log_entry()
- Changed how strings are stored in log entries, which allows us to
  store much more information in a log entry.
- ddl log is now always created at start and deleted on normal shutdown.
  This simplices things notable.
- Added probes debug_crash_here() and debug_simulate_error() to simply
  crash testing and allow crash after a given number of times a probe
  is executed. See comments in debug_sync.cc and rename_table.test for
  how this can be used.
- Reverting failed table and view renames is done trough the ddl log.
  This ensures that the ddl log is tested also outside of recovery.
- Added helper function 'handler::needs_lower_case_filenames()'
- Extend binary log with Q_XID events. ddl log handling is using this
  to check if a ddl log entry was logged to the binary log (if yes,
  it will be deleted from the log during ddl_log_close_binlogged_events()
- If a DDL entry fails 3 time, disable it. This is to ensure that if
  we have a crash in ddl recovery code the server will not get stuck
  in a forever crash-restart-crash loop.

mysqltest.cc changes:
- --die will now replace $variables with their values
- $error will contain the error of the last failed statement

storage engine changes:
- maria_rename() was changed to be more robust against crashes during
  rename.
2021-05-19 22:54:12 +02:00

65 lines
2.2 KiB
C++

#ifndef DEBUG_SYNC_INCLUDED
#define DEBUG_SYNC_INCLUDED
/* Copyright (c) 2009, 2010, Oracle and/or its affiliates.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
/**
@file
Declarations for the Debug Sync Facility. See debug_sync.cc for details.
*/
#ifdef USE_PRAGMA_INTERFACE
#pragma interface /* gcc class implementation */
#endif
class THD;
#if defined(ENABLED_DEBUG_SYNC)
/* Command line option --debug-sync-timeout. See mysqld.cc. */
extern MYSQL_PLUGIN_IMPORT uint opt_debug_sync_timeout;
/* Default WAIT_FOR timeout if command line option is given without argument. */
#define DEBUG_SYNC_DEFAULT_WAIT_TIMEOUT 300
/* Debug Sync prototypes. See debug_sync.cc. */
extern int debug_sync_init(void);
extern void debug_sync_end(void);
extern void debug_sync_init_thread(THD *thd);
extern void debug_sync_end_thread(THD *thd);
void debug_sync_reset_thread(THD *thd);
extern bool debug_sync_set_action(THD *thd, const char *action_str, size_t len);
extern bool debug_sync_update(THD *thd, char *val_str, size_t len);
extern uchar *debug_sync_value_ptr(THD *thd);
#else
static inline void debug_sync_init_thread(THD *thd) {}
static inline void debug_sync_end_thread(THD *thd) {}
static inline void debug_sync_reset_thread(THD *thd) {}
static inline bool debug_sync_set_action(THD *, const char *, size_t)
{ return false; }
#endif /* defined(ENABLED_DEBUG_SYNC) */
#ifndef DBUG_OFF
void debug_crash_here(const char *keyword);
bool debug_simulate_error(const char *keyword, uint error);
#else
#define debug_crash_here(A) do { } while(0)
#define debug_simulate_error(A, B) 0
#endif
#endif /* DEBUG_SYNC_INCLUDED */