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/* Copyright (C) 2005 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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class Format_description_log_event;
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Transaction Coordinator log - a base abstract class
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for two different implementations
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int using_heuristic_recover();
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virtual int open(const char *opt_name)=0;
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virtual void close()=0;
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virtual int log_xid(THD *thd, my_xid xid)=0;
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virtual void unlog(ulong cookie, my_xid xid)=0;
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class TC_LOG_DUMMY: public TC_LOG // use it to disable the logging
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int open(const char *opt_name) { return 0; }
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int log_xid(THD *thd, my_xid xid) { return 1; }
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void unlog(ulong cookie, my_xid xid) { }
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class TC_LOG_MMAP: public TC_LOG
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public: // only to keep Sun Forte on sol9x86 happy
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POOL, // page is in pool
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ERROR, // last sync failed
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DIRTY // new xids added since last sync
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typedef struct st_page {
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struct st_page *next; // page a linked in a fifo queue
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my_xid *start, *end; // usable area of a page
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my_xid *ptr; // next xid will be written here
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int size, free; // max and current number of free xid slots on the page
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int waiters; // number of waiters on condition
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PAGE_STATE state; // see above
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pthread_mutex_t lock; // to access page data or control structure
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pthread_cond_t cond; // to wait for a sync
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char logname[FN_REFLEN];
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struct st_page *pages, *syncing, *active, *pool, *pool_last;
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note that, e.g. LOCK_active is only used to protect
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'active' pointer, to protect the content of the active page
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one has to use active->lock.
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Same for LOCK_pool and LOCK_sync
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pthread_mutex_t LOCK_active, LOCK_pool, LOCK_sync;
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pthread_cond_t COND_pool, COND_active;
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TC_LOG_MMAP(): inited(0) {}
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int open(const char *opt_name);
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int log_xid(THD *thd, my_xid xid);
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void unlog(ulong cookie, my_xid xid);
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void get_active_from_pool();
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#define TC_LOG_MMAP TC_LOG_DUMMY
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extern TC_LOG *tc_log;
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extern TC_LOG_MMAP tc_log_mmap;
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extern TC_LOG_DUMMY tc_log_dummy;
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/* log info errors */
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#define LOG_INFO_EOF -1
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#define LOG_INFO_IO -2
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#define LOG_INFO_INVALID -3
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#define LOG_INFO_SEEK -4
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#define LOG_INFO_MEM -6
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#define LOG_INFO_FATAL -7
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#define LOG_INFO_IN_USE -8
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#define LOG_INFO_EMFILE -9
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/* bitmap to SQL_LOG::close() */
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#define LOG_CLOSE_INDEX 1
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#define LOG_CLOSE_TO_BE_OPENED 2
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#define LOG_CLOSE_STOP_EVENT 4
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class Relay_log_info;
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typedef struct st_log_info
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char log_file_name[FN_REFLEN];
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my_off_t index_file_offset, index_file_start_offset;
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bool fatal; // if the purge happens to give us a negative offset
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pthread_mutex_t lock;
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: index_file_offset(0), index_file_start_offset(0),
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log_file_name[0] = '\0';
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pthread_mutex_init(&lock, MY_MUTEX_INIT_FAST);
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~st_log_info() { pthread_mutex_destroy(&lock);}
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Currently we have only 3 kinds of logging functions: old-fashioned
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logs, stdout and csv logging routines.
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#define MAX_LOG_HANDLERS_NUM 3
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/* log event handler flags */
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class Rows_log_event;
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enum enum_log_type { LOG_UNKNOWN, LOG_NORMAL, LOG_BIN };
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enum enum_log_state { LOG_OPENED, LOG_CLOSED, LOG_TO_BE_OPENED };
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TODO use mmap instead of IO_CACHE for binlog
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(mmap+fsync is two times faster than write+fsync)
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void init_pthread_objects();
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bool open(const char *log_name,
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enum_log_type log_type,
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const char *new_name,
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enum cache_type io_cache_type_arg);
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void init(enum_log_type log_type_arg,
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enum cache_type io_cache_type_arg);
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void close(uint exiting);
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inline bool is_open() { return log_state != LOG_CLOSED; }
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const char *generate_name(const char *log_name, const char *suffix,
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bool strip_ext, char *buff);
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int generate_new_name(char *new_name, const char *log_name);
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/* LOCK_log is inited by init_pthread_objects() */
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pthread_mutex_t LOCK_log;
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char log_file_name[FN_REFLEN];
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char time_buff[20], db[NAME_LEN + 1];
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bool write_error, inited;
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enum_log_type log_type;
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volatile enum_log_state log_state;
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enum cache_type io_cache_type;
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friend class Log_event;
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class MYSQL_QUERY_LOG: public MYSQL_LOG
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MYSQL_QUERY_LOG() : last_time(0) {}
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bool write(time_t event_time, const char *user_host,
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uint user_host_len, int thread_id,
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const char *command_type, uint command_type_len,
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const char *sql_text, uint sql_text_len);
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bool write(THD *thd, time_t current_time, time_t query_start_arg,
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const char *user_host, uint user_host_len,
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ulonglong query_utime, ulonglong lock_utime, bool is_command,
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const char *sql_text, uint sql_text_len);
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bool open_slow_log(const char *log_name)
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return open(generate_name(log_name, "-slow.log", 0, buf), LOG_NORMAL, 0,
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bool open_query_log(const char *log_name)
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return open(generate_name(log_name, ".log", 0, buf), LOG_NORMAL, 0,
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class MYSQL_BIN_LOG: public TC_LOG, private MYSQL_LOG
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/* LOCK_log and LOCK_index are inited by init_pthread_objects() */
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pthread_mutex_t LOCK_index;
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pthread_mutex_t LOCK_prep_xids;
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pthread_cond_t COND_prep_xids;
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pthread_cond_t update_cond;
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ulonglong bytes_written;
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char index_file_name[FN_REFLEN];
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The max size before rotation (usable only if log_type == LOG_BIN: binary
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logs and relay logs).
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For a binlog, max_size should be max_binlog_size.
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For a relay log, it should be max_relay_log_size if this is non-zero,
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max_binlog_size otherwise.
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max_size is set in init(), and dynamically changed (when one does SET
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GLOBAL MAX_BINLOG_SIZE|MAX_RELAY_LOG_SIZE) by fix_max_binlog_size and
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fix_max_relay_log_size).
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long prepared_xids; /* for tc log - number of xids to remember */
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// current file sequence number for load data infile binary logging
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uint open_count; // For replication
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bool need_start_event;
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no_auto_events means we don't want any of these automatic events :
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Start/Rotate/Stop. That is, in 4.x when we rotate a relay log, we don't
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want a Rotate_log event to be written to the relay log. When we start a
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relay log etc. So in 4.x this is 1 for relay logs, 0 for binlogs.
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In 5.0 it's 0 for relay logs too!
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ulonglong m_table_map_version;
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int write_to_file(IO_CACHE *cache);
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This is used to start writing to a new log file. The difference from
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new_file() is locking. new_file_without_locking() does not acquire
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void new_file_without_locking();
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void new_file_impl(bool need_lock);
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MYSQL_LOG::generate_name;
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These describe the log's format. This is used only for relay logs.
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_for_exec is used by the SQL thread, _for_queue by the I/O thread. It's
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necessary to have 2 distinct objects, because the I/O thread may be reading
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events in a different format from what the SQL thread is reading (consider
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the case of a master which has been upgraded from 5.0 to 5.1 without doing
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RESET MASTER, or from 4.x to 5.0).
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Format_description_log_event *description_event_for_exec,
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*description_event_for_queue;
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note that there's no destructor ~MYSQL_BIN_LOG() !
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The reason is that we don't want it to be automatically called
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on exit() - but only during the correct shutdown process
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int open(const char *opt_name);
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int log_xid(THD *thd, my_xid xid);
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void unlog(ulong cookie, my_xid xid);
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int recover(IO_CACHE *log, Format_description_log_event *fdle);
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#if !defined(MYSQL_CLIENT)
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bool is_table_mapped(TABLE *table) const
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return table->s->table_map_version == table_map_version();
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ulonglong table_map_version() const { return m_table_map_version; }
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void update_table_map_version() { ++m_table_map_version; }
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int flush_and_set_pending_rows_event(THD *thd, Rows_log_event* event);
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#endif /* !defined(MYSQL_CLIENT) */
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void reset_bytes_written()
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void harvest_bytes_written(ulonglong* counter)
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char buf1[22],buf2[22];
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DBUG_ENTER("harvest_bytes_written");
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(*counter)+=bytes_written;
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DBUG_PRINT("info",("counter: %s bytes_written: %s", llstr(*counter,buf1),
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llstr(bytes_written,buf2)));
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void set_max_size(ulong max_size_arg);
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void signal_update();
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void wait_for_update_relay_log(THD* thd);
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int wait_for_update_bin_log(THD* thd, const struct timespec * timeout);
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void set_need_start_event() { need_start_event = 1; }
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void init(bool no_auto_events_arg, ulong max_size);
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void init_pthread_objects();
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bool open(const char *log_name,
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enum_log_type log_type,
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const char *new_name,
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enum cache_type io_cache_type_arg,
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bool no_auto_events_arg, ulong max_size,
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bool open_index_file(const char *index_file_name_arg,
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const char *log_name);
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/* Use this to start writing a new log file */
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bool write(Log_event* event_info); // binary log write
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bool write(THD *thd, IO_CACHE *cache, Log_event *commit_event);
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int write_cache(IO_CACHE *cache, bool lock_log, bool flush_and_sync);
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void start_union_events(THD *thd, query_id_t query_id_param);
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void stop_union_events(THD *thd);
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bool is_query_in_union(THD *thd, query_id_t query_id_param);
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invoked as appendv(buf1,len1,buf2,len2,...,bufn,lenn,0)
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bool appendv(const char* buf,uint len,...);
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bool append(Log_event* ev);
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void make_log_name(char* buf, const char* log_ident);
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bool is_active(const char* log_file_name);
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int update_log_index(LOG_INFO* linfo, bool need_update_threads);
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void rotate_and_purge(uint flags);
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bool flush_and_sync();
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int purge_logs(const char *to_log, bool included,
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bool need_mutex, bool need_update_threads,
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ulonglong *decrease_log_space);
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int purge_logs_before_date(time_t purge_time);
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int purge_first_log(Relay_log_info* rli, bool included);
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bool reset_logs(THD* thd);
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void close(uint exiting);
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// iterating through the log index file
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int find_log_pos(LOG_INFO* linfo, const char* log_name,
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int find_next_log(LOG_INFO* linfo, bool need_mutex);
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int get_current_log(LOG_INFO* linfo);
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int raw_get_current_log(LOG_INFO* linfo);
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inline char* get_index_fname() { return index_file_name;}
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inline char* get_log_fname() { return log_file_name; }
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inline char* get_name() { return name; }
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inline pthread_mutex_t* get_log_lock() { return &LOCK_log; }
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inline IO_CACHE* get_log_file() { return &log_file; }
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inline void lock_index() { pthread_mutex_lock(&LOCK_index);}
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inline void unlock_index() { pthread_mutex_unlock(&LOCK_index);}
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inline IO_CACHE *get_index_file() { return &index_file;}
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inline uint32 get_open_count() { return open_count; }
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class Log_event_handler
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Log_event_handler() {}
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virtual bool init()= 0;
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virtual void cleanup()= 0;
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virtual bool log_slow(THD *thd, time_t current_time,
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time_t query_start_arg, const char *user_host,
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uint user_host_len, ulonglong query_utime,
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ulonglong lock_utime, bool is_command,
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const char *sql_text, uint sql_text_len)= 0;
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virtual bool log_error(enum loglevel level, const char *format,
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virtual bool log_general(THD *thd, time_t event_time, const char *user_host,
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uint user_host_len, int thread_id,
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const char *command_type, uint command_type_len,
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const char *sql_text, uint sql_text_len,
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CHARSET_INFO *client_cs)= 0;
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virtual ~Log_event_handler() {}
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/* type of the log table */
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#define QUERY_LOG_SLOW 1
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#define QUERY_LOG_GENERAL 2
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class Log_to_file_event_handler: public Log_event_handler
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MYSQL_QUERY_LOG mysql_log;
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MYSQL_QUERY_LOG mysql_slow_log;
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Log_to_file_event_handler(): is_initialized(FALSE)
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virtual void cleanup();
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virtual bool log_slow(THD *thd, time_t current_time,
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time_t query_start_arg, const char *user_host,
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uint user_host_len, ulonglong query_utime,
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ulonglong lock_utime, bool is_command,
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const char *sql_text, uint sql_text_len);
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virtual bool log_error(enum loglevel level, const char *format,
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virtual bool log_general(THD *thd, time_t event_time, const char *user_host,
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uint user_host_len, int thread_id,
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const char *command_type, uint command_type_len,
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const char *sql_text, uint sql_text_len,
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CHARSET_INFO *client_cs);
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void init_pthread_objects();
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MYSQL_QUERY_LOG *get_mysql_slow_log() { return &mysql_slow_log; }
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MYSQL_QUERY_LOG *get_mysql_log() { return &mysql_log; }
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/* Class which manages slow, general and error log event handlers */
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rw_lock_t LOCK_logger;
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/* flag to check whether logger mutex is initialized */
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/* available log handlers */
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Log_to_file_event_handler *file_log_handler;
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/* NULL-terminated arrays of log handlers */
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Log_event_handler *error_log_handler_list[MAX_LOG_HANDLERS_NUM + 1];
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Log_event_handler *slow_log_handler_list[MAX_LOG_HANDLERS_NUM + 1];
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Log_event_handler *general_log_handler_list[MAX_LOG_HANDLERS_NUM + 1];
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LOGGER() : inited(0), file_log_handler(NULL)
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void lock_shared() { rw_rdlock(&LOCK_logger); }
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void lock_exclusive() { rw_wrlock(&LOCK_logger); }
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void unlock() { rw_unlock(&LOCK_logger); }
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bool is_log_table_enabled(uint log_table_type);
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bool log_command(THD *thd, enum enum_server_command command);
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We want to initialize all log mutexes as soon as possible,
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but we cannot do it in constructor, as safe_mutex relies on
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initialization, performed by MY_INIT(). This why this is done in
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bool flush_logs(THD *thd);
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/* Perform basic logger cleanup. this will leave e.g. error log open. */
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/* Free memory. Nothing could be logged after this function is called */
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bool error_log_print(enum loglevel level, const char *format,
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bool slow_log_print(THD *thd, const char *query, uint query_length,
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ulonglong current_utime);
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bool general_log_print(THD *thd,enum enum_server_command command,
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const char *format, va_list args);
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bool general_log_write(THD *thd, enum enum_server_command command,
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const char *query, uint query_length);
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/* we use this function to setup all enabled log event handlers */
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int set_handlers(uint error_log_printer,
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uint slow_log_printer,
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uint general_log_printer);
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void init_error_log(uint error_log_printer);
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void init_slow_log(uint slow_log_printer);
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void init_general_log(uint general_log_printer);
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void deactivate_log_handler(THD* thd, uint log_type);
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bool activate_log_handler(THD* thd, uint log_type);
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MYSQL_QUERY_LOG *get_slow_log_file_handler()
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if (file_log_handler)
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return file_log_handler->get_mysql_slow_log();
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MYSQL_QUERY_LOG *get_log_file_handler()
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if (file_log_handler)
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return file_log_handler->get_mysql_log();
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enum enum_binlog_format {
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statement-based except for cases where only row-based can work (UUID()
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BINLOG_FORMAT_MIXED= 0,
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BINLOG_FORMAT_STMT= 1, // statement-based
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BINLOG_FORMAT_ROW= 2, // row_based
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This value is last, after the end of binlog_format_typelib: it has no
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corresponding cell in this typelib. We use this value to be able to know if
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the user has explicitely specified a binlog format at startup or not.
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BINLOG_FORMAT_UNSPEC= 3
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extern TYPELIB binlog_format_typelib;