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/* Copyright (c) 2009, 2016, Oracle and/or its affiliates. All rights reserved.
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,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */
#include "my_global.h"
#include "log.h"
#include "binlog.h"
#include "log_event.h"
#include "rpl_filter.h"
#include "rpl_rli.h"
#include "sql_plugin.h"
#include "rpl_handler.h"
#include "rpl_info_factory.h"
#include "rpl_utility.h"
#include "debug_sync.h"
#include "global_threads.h"
#include "sql_show.h"
#include "sql_parse.h"
#include "rpl_mi.h"
#include "semisync_master.h"
#include <list>
#include <string>
#include <my_stacktrace.h>
using std::max;
using std::min;
using std::string;
using std::list;
#define FLAGSTR(V,F) ((V)&(F)?#F" ":"")
/**
@defgroup Binary_Log Binary Log
@{
*/
#define MY_OFF_T_UNDEF (~(my_off_t)0UL)
/*
Constants required for the limit unsafe warnings suppression
*/
//seconds after which the limit unsafe warnings suppression will be activated
#define LIMIT_UNSAFE_WARNING_ACTIVATION_TIMEOUT 50
//number of limit unsafe warnings after which the suppression will be activated
#define LIMIT_UNSAFE_WARNING_ACTIVATION_THRESHOLD_COUNT 50
#define MAX_SESSION_ATTACH_TRIES 10
static ulonglong limit_unsafe_suppression_start_time= 0;
static bool unsafe_warning_suppression_is_activated= false;
static int limit_unsafe_warning_count= 0;
static handlerton *binlog_hton;
bool opt_binlog_order_commits= true;
bool opt_gtid_precommit= false;
const char *log_bin_index= 0;
const char *log_bin_basename= 0;
MYSQL_BIN_LOG mysql_bin_log(&sync_binlog_period);
static int binlog_init(void *p);
static int binlog_start_trans_and_stmt(THD *thd, Log_event *start_event);
static int binlog_close_connection(handlerton *hton, THD *thd);
static int binlog_savepoint_set(handlerton *hton, THD *thd, void *sv);
static int binlog_savepoint_rollback(handlerton *hton, THD *thd, void *sv);
static bool binlog_savepoint_rollback_can_release_mdl(handlerton *hton,
THD *thd);
static int binlog_commit(handlerton *hton, THD *thd, bool all);
static int binlog_rollback(handlerton *hton, THD *thd, bool all);
static int binlog_prepare(handlerton *hton, THD *thd, bool all);
/**
Helper class to hold a mutex for the duration of the
block.
Eliminates the need for explicit unlocking of mutexes on, e.g.,
error returns. On passing a null pointer, the sentry will not do
anything.
*/
class Mutex_sentry
{
public:
Mutex_sentry(mysql_mutex_t *mutex)
: m_mutex(mutex)
{
if (m_mutex)
mysql_mutex_lock(mutex);
}
~Mutex_sentry()
{
if (m_mutex)
mysql_mutex_unlock(m_mutex);
#ifndef DBUG_OFF
m_mutex= 0;
#endif
}
private:
mysql_mutex_t *m_mutex;
// It's not allowed to copy this object in any way
Mutex_sentry(Mutex_sentry const&);
void operator=(Mutex_sentry const&);
};
/**
Print system time.
*/
static void print_system_time()
{
#ifdef __WIN__
SYSTEMTIME utc_time;
GetSystemTime(&utc_time);
const long hrs= utc_time.wHour;
const long mins= utc_time.wMinute;
const long secs= utc_time.wSecond;
#else
/* Using time() instead of my_time() to avoid looping */
const time_t curr_time= time(NULL);
/* Calculate time of day */
const long tmins = curr_time / 60;
const long thrs = tmins / 60;
const long hrs = thrs % 24;
const long mins = tmins % 60;
const long secs = curr_time % 60;
#endif
char hrs_buf[3]= "00";
char mins_buf[3]= "00";
char secs_buf[3]= "00";
int base= 10;
my_safe_itoa(base, hrs, &hrs_buf[2]);
my_safe_itoa(base, mins, &mins_buf[2]);
my_safe_itoa(base, secs, &secs_buf[2]);
my_safe_printf_stderr("---------- %s:%s:%s UTC - ",
hrs_buf, mins_buf, secs_buf);
}
/**
Helper class to perform a thread excursion.
This class is used to temporarily switch to another session (THD
structure). It will set up thread specific "globals" correctly
so that the POSIX thread looks exactly like the session attached to.
However, PSI_thread info is not touched as it is required to show
the actual physial view in PFS instrumentation i.e., it should
depict as the real thread doing the work instead of thread it switched
to.
On destruction, the original session (which is supplied to the
constructor) will be re-attached automatically. For example, with
this code, the value of @c current_thd will be the same before and
after execution of the code.
@code
{
Thread_excursion excursion(current_thd);
for (int i = 0 ; i < count ; ++i)
excursion.attach_to(other_thd[i]);
}
@endcode
@warning The class is not designed to be inherited from.
*/
class Thread_excursion
{
public:
Thread_excursion(THD *thd)
: m_original_thd(thd)
{
}
~Thread_excursion() {
#ifndef EMBEDDED_LIBRARY
if (unlikely(setup_thread_globals(m_original_thd)))
DBUG_ASSERT(0); // Out of memory?!
#endif
}
/**
Try to attach the POSIX thread to a session.
- This function attaches the POSIX thread to a session
in MAX_SESSION_ATTACH_TRIES tries when encountering
'out of memory' error, and terminates the server after
failed in MAX_SESSION_ATTACH_TRIES tries.
@param[in] thd The thd of a session
*/
void try_to_attach_to(THD *thd)
{
int i= 0;
/*
Attach the POSIX thread to a session in MAX_SESSION_ATTACH_TRIES
tries when encountering 'out of memory' error.
*/
while (i < MAX_SESSION_ATTACH_TRIES)
{
/*
Currently attach_to(...) returns ER_OUTOFMEMORY or 0. So
we continue to attach the POSIX thread when encountering
the ER_OUTOFMEMORY error. Please take care other error
returned from attach_to(...) in future.
*/
if (!attach_to(thd))
{
if (i > 0)
sql_print_warning("Server overcomes the temporary 'out of memory' "
"in '%d' tries while attaching to session thread "
"during the group commit phase.\n", i + 1);
break;
}
i++;
}
/*
Terminate the server after failed to attach the POSIX thread
to a session in MAX_SESSION_ATTACH_TRIES tries.
*/
if (MAX_SESSION_ATTACH_TRIES == i)
{
print_system_time();
my_safe_printf_stderr("%s", "[Fatal] Out of memory while attaching to "
"session thread during the group commit phase. "
"Data consistency between master and slave can "
"be guaranteed after server restarts.\n");
_exit(EXIT_FAILURE);
}
}
private:
/**
Attach the POSIX thread to a session.
*/
int attach_to(THD *thd)
{
#ifndef EMBEDDED_LIBRARY
if (DBUG_EVALUATE_IF("simulate_session_attach_error", 1, 0)
|| unlikely(setup_thread_globals(thd)))
{
/*
Indirectly uses pthread_setspecific, which can only return
ENOMEM or EINVAL. Since store_globals are using correct keys,
the only alternative is out of memory.
*/
return ER_OUTOFMEMORY;
}
#endif /* EMBEDDED_LIBRARY */
return 0;
}
int setup_thread_globals(THD *thd) const {
int error= 0;
THD *original_thd= my_pthread_getspecific(THD*, THR_THD);
MEM_ROOT* original_mem_root= my_pthread_getspecific(MEM_ROOT*, THR_MALLOC);
if ((error= my_pthread_setspecific_ptr(THR_THD, thd)))
goto exit0;
if ((error= my_pthread_setspecific_ptr(THR_MALLOC, &thd->mem_root)))
goto exit1;
if ((error= set_mysys_var(thd->mysys_var)))
goto exit2;
goto exit0;
exit2:
error= my_pthread_setspecific_ptr(THR_MALLOC, original_mem_root);
exit1:
error= my_pthread_setspecific_ptr(THR_THD, original_thd);
exit0:
return error;
}
THD *m_original_thd;
};
/**
Caches for non-transactional and transactional data before writing
it to the binary log.
@todo All the access functions for the flags suggest that the
encapsuling is not done correctly, so try to move any logic that
requires access to the flags into the cache.
*/
class binlog_cache_data
{
public:
binlog_cache_data(bool trx_cache_arg,
my_off_t max_binlog_cache_size_arg,
ulong *ptr_binlog_cache_use_arg,
ulong *ptr_binlog_cache_disk_use_arg)
: m_pending(0), saved_max_binlog_cache_size(max_binlog_cache_size_arg),
ptr_binlog_cache_use(ptr_binlog_cache_use_arg),
ptr_binlog_cache_disk_use(ptr_binlog_cache_disk_use_arg)
{
reset();
flags.transactional= trx_cache_arg;
cache_log.end_of_file= saved_max_binlog_cache_size;
}
int finalize(THD *thd, Log_event *end_event);
int flush(THD *thd, my_off_t *bytes, bool *wrote_xid);
int write_event(THD *thd, Log_event *event);
virtual ~binlog_cache_data()
{
DBUG_ASSERT(is_binlog_empty());
close_cached_file(&cache_log);
}
bool is_binlog_empty() const
{
my_off_t pos= my_b_tell(&cache_log);
DBUG_PRINT("debug", ("%s_cache - pending: 0x%llx, bytes: %llu",
(flags.transactional ? "trx" : "stmt"),
(ulonglong) pending(), (ulonglong) pos));
return pending() == NULL && pos == 0;
}
bool is_group_cache_empty() const
{
return group_cache.is_empty();
}
bool is_finalized() const {
return flags.finalized;
}
Rows_log_event *pending() const
{
return m_pending;
}
void set_pending(Rows_log_event *const pending)
{
m_pending= pending;
}
void set_incident(void)
{
flags.incident= true;
}
bool has_incident(void) const
{
return flags.incident;
}
bool has_xid() const {
// There should only be an XID event if we are transactional
DBUG_ASSERT((flags.transactional && flags.with_xid) || !flags.with_xid);
return flags.with_xid;
}
bool is_trx_cache() const
{
return flags.transactional;
}
my_off_t get_byte_position() const
{
return my_b_tell(&cache_log);
}
virtual void reset()
{
compute_statistics();
truncate(0);
/*
If IOCACHE has a file associated, change its size to 0.
It is safer to do it here, since we are certain that one
asked the cache to go to position 0 with truncate.
*/
if(cache_log.file != -1)
{
int error= 0;
if((error= my_chsize(cache_log.file, 0, 0, MYF(MY_WME))))
sql_print_warning("Unable to resize binlog IOCACHE auxilary file");
DBUG_EXECUTE_IF("show_io_cache_size",
{
ulong file_size= my_seek(cache_log.file,
0L,MY_SEEK_END,MYF(MY_WME+MY_FAE));
sql_print_error("New size:%ld", file_size);
});
}
flags.incident= false;
flags.with_xid= false;
flags.immediate= false;
flags.finalized= false;
/*
The truncate function calls reinit_io_cache that calls my_b_flush_io_cache
which may increase disk_writes. This breaks the disk_writes use by the
binary log which aims to compute the ratio between in-memory cache usage
and disk cache usage. To avoid this undesirable behavior, we reset the
variable after truncating the cache.
*/
cache_log.disk_writes= 0;
group_cache.clear();
DBUG_ASSERT(is_binlog_empty());
}
/*
Sets the write position to point at the position given. If the
cache has swapped to a file, it reinitializes it, so that the
proper data is added to the IO_CACHE buffer. Otherwise, it just
does a my_b_seek.
my_b_seek will not work if the cache has swapped, that's why
we do this workaround.
@param[IN] pos the new write position.
@param[IN] use_reinit if the position should be reset resorting
to reset_io_cache (which may issue a flush_io_cache
inside)
@return The previous write position.
*/
my_off_t reset_write_pos(my_off_t pos, bool use_reinit)
{
DBUG_ENTER("reset_write_pos");
DBUG_ASSERT(cache_log.type == WRITE_CACHE);
my_off_t oldpos= get_byte_position();
if (use_reinit)
reinit_io_cache(&cache_log, WRITE_CACHE, pos, 0, 0);
else
my_b_seek(&cache_log, pos);
DBUG_RETURN(oldpos);
}
/*
Cache to store data before copying it to the binary log.
*/
IO_CACHE cache_log;
/**
The group cache for this cache.
*/
Group_cache group_cache;
protected:
/*
It truncates the cache to a certain position. This includes deleting the
pending event.
*/
void truncate(my_off_t pos)
{
DBUG_PRINT("info", ("truncating to position %lu", (ulong) pos));
remove_pending_event();
reinit_io_cache(&cache_log, WRITE_CACHE, pos, 0, 0);
cache_log.end_of_file= saved_max_binlog_cache_size;
}
/**
Flush pending event to the cache buffer.
*/
int flush_pending_event(THD *thd) {
if (m_pending)
{
m_pending->set_flags(Rows_log_event::STMT_END_F);
if (int error= write_event(thd, m_pending))
return error;
thd->clear_binlog_table_maps();
}
return 0;
}
/**
Remove the pending event.
*/
int remove_pending_event() {
delete m_pending;
m_pending= NULL;
return 0;
}
struct Flags {
/*
Defines if this is either a trx-cache or stmt-cache, respectively, a
transactional or non-transactional cache.
*/
bool transactional:1;
/*
This indicates that some events did not get into the cache and most likely
it is corrupted.
*/
bool incident:1;
/*
This indicates that the cache should be written without BEGIN/END.
*/
bool immediate:1;
/*
This flag indicates that the buffer was finalized and has to be
flushed to disk.
*/
bool finalized:1;
/*
This indicates that the cache contain an XID event.
*/
bool with_xid:1;
} flags;
private:
/*
Pending binrows event. This event is the event where the rows are currently
written.
*/
Rows_log_event *m_pending;
/**
This function computes binlog cache and disk usage.
*/
void compute_statistics()
{
if (!is_binlog_empty())
{
statistic_increment(*ptr_binlog_cache_use, &LOCK_status);
if (cache_log.disk_writes != 0)
statistic_increment(*ptr_binlog_cache_disk_use, &LOCK_status);
}
}
/*
Stores the values of maximum size of the cache allowed when this cache
is configured. This corresponds to either
. max_binlog_cache_size or max_binlog_stmt_cache_size.
*/
my_off_t saved_max_binlog_cache_size;
/*
Stores a pointer to the status variable that keeps track of the in-memory
cache usage. This corresponds to either
. binlog_cache_use or binlog_stmt_cache_use.
*/
ulong *ptr_binlog_cache_use;
/*
Stores a pointer to the status variable that keeps track of the disk
cache usage. This corresponds to either
. binlog_cache_disk_use or binlog_stmt_cache_disk_use.
*/
ulong *ptr_binlog_cache_disk_use;
binlog_cache_data& operator=(const binlog_cache_data& info);
binlog_cache_data(const binlog_cache_data& info);
};
class binlog_stmt_cache_data
: public binlog_cache_data
{
public:
binlog_stmt_cache_data(bool trx_cache_arg,
my_off_t max_binlog_cache_size_arg,
ulong *ptr_binlog_cache_use_arg,
ulong *ptr_binlog_cache_disk_use_arg)
: binlog_cache_data(trx_cache_arg,
max_binlog_cache_size_arg,
ptr_binlog_cache_use_arg,
ptr_binlog_cache_disk_use_arg)
{
}
using binlog_cache_data::finalize;
int finalize(THD *thd);
};
int
binlog_stmt_cache_data::finalize(THD *thd)
{
if (flags.immediate)
{
if (int error= finalize(thd, NULL))
return error;
}
else
{
Query_log_event
end_evt(thd, STRING_WITH_LEN("COMMIT"), false, false, true, 0, true);
if (int error= finalize(thd, &end_evt))
return error;
}
return 0;
}
class binlog_trx_cache_data : public binlog_cache_data
{
public:
binlog_trx_cache_data(bool trx_cache_arg,
my_off_t max_binlog_cache_size_arg,
ulong *ptr_binlog_cache_use_arg,
ulong *ptr_binlog_cache_disk_use_arg)
: binlog_cache_data(trx_cache_arg,
max_binlog_cache_size_arg,
ptr_binlog_cache_use_arg,
ptr_binlog_cache_disk_use_arg),
m_cannot_rollback(FALSE), before_stmt_pos(MY_OFF_T_UNDEF)
{ }
void reset()
{
DBUG_ENTER("reset");
DBUG_PRINT("enter", ("before_stmt_pos: %llu", (ulonglong) before_stmt_pos));
m_cannot_rollback= FALSE;
before_stmt_pos= MY_OFF_T_UNDEF;
binlog_cache_data::reset();
DBUG_PRINT("return", ("before_stmt_pos: %llu", (ulonglong) before_stmt_pos));
DBUG_VOID_RETURN;
}
bool cannot_rollback() const
{
return m_cannot_rollback;
}
void set_cannot_rollback()
{
m_cannot_rollback= TRUE;
}
my_off_t get_prev_position() const
{
return before_stmt_pos;
}
void set_prev_position(my_off_t pos)
{
DBUG_ENTER("set_prev_position");
DBUG_PRINT("enter", ("before_stmt_pos: %llu", (ulonglong) before_stmt_pos));
before_stmt_pos= pos;
DBUG_PRINT("return", ("before_stmt_pos: %llu", (ulonglong) before_stmt_pos));
DBUG_VOID_RETURN;
}
void restore_prev_position()
{
DBUG_ENTER("restore_prev_position");
DBUG_PRINT("enter", ("before_stmt_pos: %llu", (ulonglong) before_stmt_pos));
binlog_cache_data::truncate(before_stmt_pos);
before_stmt_pos= MY_OFF_T_UNDEF;
DBUG_PRINT("return", ("before_stmt_pos: %llu", (ulonglong) before_stmt_pos));
DBUG_VOID_RETURN;
}
void restore_savepoint(my_off_t pos)
{
DBUG_ENTER("restore_savepoint");
DBUG_PRINT("enter", ("before_stmt_pos: %llu", (ulonglong) before_stmt_pos));
binlog_cache_data::truncate(pos);
if (pos <= before_stmt_pos)
before_stmt_pos= MY_OFF_T_UNDEF;
DBUG_PRINT("return", ("before_stmt_pos: %llu", (ulonglong) before_stmt_pos));
DBUG_VOID_RETURN;
}
using binlog_cache_data::truncate;
int truncate(THD *thd, bool all);
private:
/*
It will be set TRUE if any statement which cannot be rolled back safely
is put in trx_cache.
*/
bool m_cannot_rollback;
/*
Binlog position before the start of the current statement.
*/
my_off_t before_stmt_pos;
binlog_trx_cache_data& operator=(const binlog_trx_cache_data& info);
binlog_trx_cache_data(const binlog_trx_cache_data& info);
};
class binlog_cache_mngr {
public:
binlog_cache_mngr(my_off_t max_binlog_stmt_cache_size_arg,
ulong *ptr_binlog_stmt_cache_use_arg,
ulong *ptr_binlog_stmt_cache_disk_use_arg,
my_off_t max_binlog_cache_size_arg,
ulong *ptr_binlog_cache_use_arg,
ulong *ptr_binlog_cache_disk_use_arg)
: stmt_cache(FALSE, max_binlog_stmt_cache_size_arg,
ptr_binlog_stmt_cache_use_arg,
ptr_binlog_stmt_cache_disk_use_arg),
trx_cache(TRUE, max_binlog_cache_size_arg,
ptr_binlog_cache_use_arg,
ptr_binlog_cache_disk_use_arg)
{ }
binlog_cache_data* get_binlog_cache_data(bool is_transactional)
{
if (is_transactional)
return &trx_cache;
else
return &stmt_cache;
}
IO_CACHE* get_binlog_cache_log(bool is_transactional)
{
return (is_transactional ? &trx_cache.cache_log : &stmt_cache.cache_log);
}
/**
Convenience method to check if both caches are empty.
*/
bool is_binlog_empty() const {
return stmt_cache.is_binlog_empty() && trx_cache.is_binlog_empty();
}
/*
clear stmt_cache and trx_cache if they are not empty
*/
void reset()
{
if (!stmt_cache.is_binlog_empty())
stmt_cache.reset();
if (!trx_cache.is_binlog_empty())
trx_cache.reset();
}
#ifndef DBUG_OFF
bool dbug_any_finalized() const {
return stmt_cache.is_finalized() || trx_cache.is_finalized();
}
#endif
bool all_finalized() const {
return (stmt_cache.is_finalized() && trx_cache.is_finalized());
}
/*
Convenience method to flush both caches to the binary log.
@param bytes_written Pointer to variable that will be set to the
number of bytes written for the flush.
@param wrote_xid Pointer to variable that will be set to @c
true if any XID event was written to the
binary log. Otherwise, the variable will not
be touched.
@return Error code on error, zero if no error.
*/
int flush(THD *thd, my_off_t *bytes_written, bool *wrote_xid)
{
my_off_t stmt_bytes= 0;
my_off_t trx_bytes= 0;
bool clear_gtid= false;
DBUG_ASSERT(stmt_cache.has_xid() == 0);
if (gtid_mode && all_finalized())
{
DBUG_ASSERT(thd->gtid_precommit);
DBUG_ASSERT(thd->enable_unsafe_stmt);
/**
stmt_cache and trx_cache are both not empty. They will generate
Gtid seperately. So we need to clear the owned gtid after flushing
stmt_cache to avoid some ASSERT later.
*/
clear_gtid= true;
}
if (int error= stmt_cache.flush(thd, &stmt_bytes, wrote_xid))
return error;
if (clear_gtid)
{
thd->clear_owned_gtids();
thd->variables.gtid_next.set_undefined();
}
if (int error= trx_cache.flush(thd, &trx_bytes, wrote_xid))
return error;
*bytes_written= stmt_bytes + trx_bytes;
return 0;
}
binlog_stmt_cache_data stmt_cache;
binlog_trx_cache_data trx_cache;
private:
binlog_cache_mngr& operator=(const binlog_cache_mngr& info);
binlog_cache_mngr(const binlog_cache_mngr& info);
};
static binlog_cache_mngr *thd_get_cache_mngr(const THD *thd)
{
/*
If opt_bin_log is not set, binlog_hton->slot == -1 and hence
thd_get_ha_data(thd, hton) segfaults.
*/
DBUG_ASSERT(opt_bin_log);
return (binlog_cache_mngr *)thd_get_ha_data(thd, binlog_hton);
}
/**
Checks if the BINLOG_CACHE_SIZE's value is greater than MAX_BINLOG_CACHE_SIZE.
If this happens, the BINLOG_CACHE_SIZE is set to MAX_BINLOG_CACHE_SIZE.
*/
void check_binlog_cache_size(THD *thd)
{
if (binlog_cache_size > max_binlog_cache_size)
{
if (thd)
{
push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN,
ER_BINLOG_CACHE_SIZE_GREATER_THAN_MAX,
ER(ER_BINLOG_CACHE_SIZE_GREATER_THAN_MAX),
(ulong) binlog_cache_size,
(ulong) max_binlog_cache_size);
}
else
{
sql_print_warning(ER_DEFAULT(ER_BINLOG_CACHE_SIZE_GREATER_THAN_MAX),
(ulong) binlog_cache_size,
(ulong) max_binlog_cache_size);
}
binlog_cache_size= max_binlog_cache_size;
}
}
/**
Checks if the BINLOG_STMT_CACHE_SIZE's value is greater than MAX_BINLOG_STMT_CACHE_SIZE.
If this happens, the BINLOG_STMT_CACHE_SIZE is set to MAX_BINLOG_STMT_CACHE_SIZE.
*/
void check_binlog_stmt_cache_size(THD *thd)
{
if (binlog_stmt_cache_size > max_binlog_stmt_cache_size)
{
if (thd)
{
push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN,
ER_BINLOG_STMT_CACHE_SIZE_GREATER_THAN_MAX,
ER(ER_BINLOG_STMT_CACHE_SIZE_GREATER_THAN_MAX),
(ulong) binlog_stmt_cache_size,
(ulong) max_binlog_stmt_cache_size);
}
else
{
sql_print_warning(ER_DEFAULT(ER_BINLOG_STMT_CACHE_SIZE_GREATER_THAN_MAX),
(ulong) binlog_stmt_cache_size,
(ulong) max_binlog_stmt_cache_size);
}
binlog_stmt_cache_size= max_binlog_stmt_cache_size;
}
}
/**
Check whether binlog_hton has valid slot and enabled
*/
bool binlog_enabled()
{
return(binlog_hton && binlog_hton->slot != HA_SLOT_UNDEF);
}
/*
Save position of binary log transaction cache.
SYNPOSIS
binlog_trans_log_savepos()
thd The thread to take the binlog data from
pos Pointer to variable where the position will be stored
DESCRIPTION
Save the current position in the binary log transaction cache into
the variable pointed to by 'pos'
*/
static void
binlog_trans_log_savepos(THD *thd, my_off_t *pos)
{
DBUG_ENTER("binlog_trans_log_savepos");
DBUG_ASSERT(pos != NULL);
binlog_cache_mngr *const cache_mngr= thd_get_cache_mngr(thd);
DBUG_ASSERT(mysql_bin_log.is_open());
*pos= cache_mngr->trx_cache.get_byte_position();
DBUG_PRINT("return", ("position: %lu", (ulong) *pos));
DBUG_VOID_RETURN;
}
/*
this function is mostly a placeholder.
conceptually, binlog initialization (now mostly done in MYSQL_BIN_LOG::open)
should be moved here.
*/
static int binlog_init(void *p)
{
binlog_hton= (handlerton *)p;
binlog_hton->state=opt_bin_log ? SHOW_OPTION_YES : SHOW_OPTION_NO;
binlog_hton->db_type=DB_TYPE_BINLOG;
binlog_hton->savepoint_offset= sizeof(my_off_t);
binlog_hton->close_connection= binlog_close_connection;
binlog_hton->savepoint_set= binlog_savepoint_set;
binlog_hton->savepoint_rollback= binlog_savepoint_rollback;
binlog_hton->savepoint_rollback_can_release_mdl=
binlog_savepoint_rollback_can_release_mdl;
binlog_hton->commit= binlog_commit;
binlog_hton->rollback= binlog_rollback;
binlog_hton->prepare= binlog_prepare;
binlog_hton->flags= HTON_NOT_USER_SELECTABLE | HTON_HIDDEN;
return 0;
}
static int binlog_close_connection(handlerton *hton, THD *thd)
{
DBUG_ENTER("binlog_close_connection");
binlog_cache_mngr *const cache_mngr= thd_get_cache_mngr(thd);
DBUG_ASSERT(cache_mngr->is_binlog_empty());
DBUG_ASSERT(cache_mngr->trx_cache.is_group_cache_empty() &&
cache_mngr->stmt_cache.is_group_cache_empty());
DBUG_PRINT("debug", ("Set ha_data slot %d to 0x%llx", binlog_hton->slot, (ulonglong) NULL));
thd_set_ha_data(thd, binlog_hton, NULL);
cache_mngr->~binlog_cache_mngr();
my_free(cache_mngr);
DBUG_RETURN(0);
}
int binlog_cache_data::write_event(THD *thd, Log_event *ev)
{
DBUG_ENTER("binlog_cache_data::write_event");
if (gtid_mode > 0)
{
Group_cache::enum_add_group_status status=
group_cache.add_logged_group(thd, get_byte_position());
if (status == Group_cache::ERROR)
DBUG_RETURN(1);
else if (status == Group_cache::APPEND_NEW_GROUP)
{
Gtid_log_event gtid_ev(thd, is_trx_cache());
if (gtid_ev.write(&cache_log) != 0)
DBUG_RETURN(1);
}
}
if (ev != NULL)
{
DBUG_EXECUTE_IF("simulate_disk_full_at_flush_pending",
{DBUG_SET("+d,simulate_file_write_error");});
if (ev->write(&cache_log) != 0)
{
DBUG_EXECUTE_IF("simulate_disk_full_at_flush_pending",
{
DBUG_SET("-d,simulate_file_write_error");
DBUG_SET("-d,simulate_disk_full_at_flush_pending");
/*
after +d,simulate_file_write_error the local cache
is in unsane state. Since -d,simulate_file_write_error
revokes the first simulation do_write_cache()
can't be run without facing an assert.
So it's blocked with the following 2nd simulation:
*/
DBUG_SET("+d,simulate_do_write_cache_failure");
});
DBUG_RETURN(1);
}
if (ev->get_type_code() == XID_EVENT)
flags.with_xid= true;
if (ev->is_using_immediate_logging())
flags.immediate= true;
}
DBUG_RETURN(0);
}
/**
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