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rpl_binlog_sender.cc
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rpl_binlog_sender.cc
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/* Copyright (c) 2013, 2017, 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 */
#ifdef HAVE_REPLICATION
#include "rpl_binlog_sender.h"
#include "debug_sync.h" // debug_sync_set_action
#include "log.h" // sql_print_information
#include "log_event.h" // MAX_MAX_ALLOWED_PACKET
#include "rpl_constants.h" // BINLOG_DUMP_NON_BLOCK
#include "rpl_handler.h" // RUN_HOOK
#include "rpl_master.h" // opt_sporadic_binlog_dump_fail
#include "rpl_reporting.h" // MAX_SLAVE_ERRMSG
#include "sql_class.h" // THD
#include "pfs_file_provider.h"
#include "mysql/psi/mysql_file.h"
#ifndef DBUG_OFF
static uint binlog_dump_count= 0;
#endif
using binary_log::checksum_crc32;
const uint32 Binlog_sender::PACKET_MIN_SIZE= 4096;
const uint32 Binlog_sender::PACKET_MAX_SIZE= UINT_MAX32;
const ushort Binlog_sender::PACKET_SHRINK_COUNTER_THRESHOLD= 100;
const float Binlog_sender::PACKET_GROW_FACTOR= 2.0;
const float Binlog_sender::PACKET_SHRINK_FACTOR= 0.5;
Binlog_sender::Binlog_sender(THD *thd, const char *start_file,
my_off_t start_pos,
Gtid_set *exclude_gtids, uint32 flag)
: m_thd(thd),
m_packet(*thd->get_protocol_classic()->get_packet()),
m_start_file(start_file),
m_start_pos(start_pos), m_exclude_gtid(exclude_gtids),
m_using_gtid_protocol(exclude_gtids != NULL),
m_check_previous_gtid_event(exclude_gtids != NULL),
m_gtid_clear_fd_created_flag(exclude_gtids == NULL),
m_diag_area(false),
m_errmsg(NULL), m_errno(0), m_last_file(NULL), m_last_pos(0),
m_half_buffer_size_req_counter(0), m_new_shrink_size(PACKET_MIN_SIZE),
m_flag(flag), m_observe_transmission(false), m_transmit_started(false)
{}
void Binlog_sender::init()
{
DBUG_ENTER("Binlog_sender::init");
THD *thd= m_thd;
thd->push_diagnostics_area(&m_diag_area);
init_heartbeat_period();
m_last_event_sent_ts= time(0);
mysql_mutex_lock(&thd->LOCK_thd_data);
thd->current_linfo= &m_linfo;
mysql_mutex_unlock(&thd->LOCK_thd_data);
/* Initialize the buffer only once. */
m_packet.mem_realloc(PACKET_MIN_SIZE); // size of the buffer
m_new_shrink_size= PACKET_MIN_SIZE;
DBUG_PRINT("info", ("Initial packet->alloced_length: %zu",
m_packet.alloced_length()));
if (!mysql_bin_log.is_open())
{
set_fatal_error("Binary log is not open");
DBUG_VOID_RETURN;
}
if (DBUG_EVALUATE_IF("simulate_no_server_id", true, server_id == 0))
{
set_fatal_error("Misconfigured master - master server_id is 0");
DBUG_VOID_RETURN;
}
if (m_using_gtid_protocol)
{
enum_gtid_mode gtid_mode= get_gtid_mode(GTID_MODE_LOCK_NONE);
if (gtid_mode != GTID_MODE_ON)
{
char buf[MYSQL_ERRMSG_SIZE];
sprintf(buf, "The replication sender thread cannot start in "
"AUTO_POSITION mode: this server has GTID_MODE = %.192s "
"instead of ON.", get_gtid_mode_string(gtid_mode));
set_fatal_error(buf);
DBUG_VOID_RETURN;
}
}
if (check_start_file())
DBUG_VOID_RETURN;
sql_print_information("Start binlog_dump to master_thread_id(%u) "
"slave_server(%u), pos(%s, %llu)",
thd->thread_id(), thd->server_id,
m_start_file, m_start_pos);
if (RUN_HOOK(binlog_transmit, transmit_start,
(thd, m_flag, m_start_file, m_start_pos,
&m_observe_transmission)))
{
set_unknow_error("Failed to run hook 'transmit_start'");
DBUG_VOID_RETURN;
}
m_transmit_started=true;
init_checksum_alg();
/*
There are two ways to tell the server to not block:
- Set the BINLOG_DUMP_NON_BLOCK flag.
This is official, documented, not used by any mysql
client, but used by some external users.
- Set server_id=0.
This is unofficial, undocumented, and used by
mysqlbinlog -R since the beginning of time.
When mysqlbinlog --stop-never is used, it sets a 'fake'
server_id that defaults to 1 but can be set to anything
else using stop-never-slave-server-id. This has the
drawback that if the server_id conflicts with any other
running slave, or with any other instance of mysqlbinlog
--stop-never, then that other instance will be killed. It
is also an unnecessary burden on the user to have to
specify a server_id different from all other server_ids
just to avoid conflicts.
As of MySQL 5.6.20 and 5.7.5, mysqlbinlog redundantly sets
the BINLOG_DUMP_NONBLOCK flag when one or both of the
following holds:
- the --stop-never option is *not* specified
In a far future, this means we can remove the unofficial
functionality that server_id=0 implies nonblocking
behavior. That will allow mysqlbinlog to use server_id=0
always. That has the advantage that mysqlbinlog
--stop-never cannot cause any running dump threads to be
killed.
*/
m_wait_new_events= !((thd->server_id == 0) ||
((m_flag & BINLOG_DUMP_NON_BLOCK) != 0));
/* Binary event can be vary large. So set it to max allowed packet. */
thd->variables.max_allowed_packet= MAX_MAX_ALLOWED_PACKET;
#ifndef DBUG_OFF
if (opt_sporadic_binlog_dump_fail && (binlog_dump_count++ % 2))
set_unknow_error("Master fails in COM_BINLOG_DUMP because of "
"--sporadic-binlog-dump-fail");
m_event_count= 0;
#endif
DBUG_VOID_RETURN;
}
void Binlog_sender::cleanup()
{
DBUG_ENTER("Binlog_sender::cleanup");
THD *thd= m_thd;
if (m_transmit_started)
(void) RUN_HOOK(binlog_transmit, transmit_stop, (thd, m_flag));
mysql_mutex_lock(&thd->LOCK_thd_data);
thd->current_linfo= NULL;
mysql_mutex_unlock(&thd->LOCK_thd_data);
thd->variables.max_allowed_packet= global_system_variables.max_allowed_packet;
thd->pop_diagnostics_area();
if (has_error())
my_message(m_errno, m_errmsg, MYF(0));
else
my_eof(thd);
DBUG_VOID_RETURN;
}
void Binlog_sender::run()
{
DBUG_ENTER("Binlog_sender::run");
File file= -1;
IO_CACHE log_cache;
my_off_t start_pos= m_start_pos;
const char *log_file= m_linfo.log_file_name;
bool is_index_file_reopened_on_binlog_disable= false;
init();
while (!has_error() && !m_thd->killed)
{
/*
Faked rotate event is only required in a few cases(see comment of the
function). But even so, a faked rotate event is always sent before sending
event log file, even if a rotate log event exists in last binlog and
was already sent. The slave then gets an extra rotation and records
two Rotate_log_events.
The main issue here are some dependencies on mysqlbinlog, that should be
solved in the future.
*/
if (unlikely(fake_rotate_event(log_file, start_pos)))
break;
file= open_binlog_file(&log_cache, log_file, &m_errmsg);
if (unlikely(file < 0))
{
set_fatal_error(m_errmsg);
break;
}
THD_STAGE_INFO(m_thd, stage_sending_binlog_event_to_slave);
if (send_binlog(&log_cache, start_pos))
break;
/* Will go to next file, need to copy log file name */
set_last_file(log_file);
THD_STAGE_INFO(m_thd,
stage_finished_reading_one_binlog_switching_to_next_binlog);
DBUG_EXECUTE_IF("waiting_for_disable_binlog",
{
const char act[]= "now "
"signal dump_thread_reached_wait_point "
"wait_for continue_dump_thread no_clear_event";
DBUG_ASSERT(!debug_sync_set_action(current_thd,
STRING_WITH_LEN(act)));
};);
mysql_bin_log.lock_index();
if (!mysql_bin_log.is_open())
{
if (mysql_bin_log.open_index_file(mysql_bin_log.get_index_fname(),
log_file, FALSE))
{
set_fatal_error("Binary log is not open and failed to open index file "
"to retrieve next file.");
mysql_bin_log.unlock_index();
break;
}
is_index_file_reopened_on_binlog_disable= true;
}
int error= mysql_bin_log.find_next_log(&m_linfo, 0);
mysql_bin_log.unlock_index();
if (unlikely(error))
{
DBUG_EXECUTE_IF("waiting_for_disable_binlog",
{
const char act[]= "now signal consumed_binlog";
DBUG_ASSERT(!debug_sync_set_action(current_thd,
STRING_WITH_LEN(act)));
};);
if (is_index_file_reopened_on_binlog_disable)
mysql_bin_log.close(LOG_CLOSE_INDEX, true/*need_lock_log=true*/,
true/*need_lock_index=true*/);
set_fatal_error("could not find next log");
break;
}
start_pos= BIN_LOG_HEADER_SIZE;
end_io_cache(&log_cache);
mysql_file_close(file, MYF(MY_WME));
file= -1;
}
THD_STAGE_INFO(m_thd, stage_waiting_to_finalize_termination);
char error_text[MAX_SLAVE_ERRMSG];
/*
If the dump thread was killed because of a duplicate slave UUID we
will fail throwing an error to the slave so it will not try to
reconnect anymore.
*/
mysql_mutex_lock(&m_thd->LOCK_thd_data);
bool was_killed_by_duplicate_slave_id= m_thd->duplicate_slave_id;
mysql_mutex_unlock(&m_thd->LOCK_thd_data);
if (was_killed_by_duplicate_slave_id)
set_fatal_error("A slave with the same server_uuid/server_id as this slave "
"has connected to the master");
if (file > 0)
{
if (is_fatal_error())
{
/* output events range to error message */
my_snprintf(error_text, sizeof(error_text),
"%s; the first event '%s' at %lld, "
"the last event read from '%s' at %lld, "
"the last byte read from '%s' at %lld.",
m_errmsg,
m_start_file, m_start_pos, m_last_file, m_last_pos,
log_file, my_b_tell(&log_cache));
set_fatal_error(error_text);
}
end_io_cache(&log_cache);
mysql_file_close(file, MYF(MY_WME));
}
cleanup();
DBUG_VOID_RETURN;
}
my_off_t Binlog_sender::send_binlog(IO_CACHE *log_cache, my_off_t start_pos)
{
if (unlikely(send_format_description_event(log_cache, start_pos)))
return 1;
if (start_pos == BIN_LOG_HEADER_SIZE)
start_pos= my_b_tell(log_cache);
if (m_check_previous_gtid_event)
{
bool has_prev_gtid_ev;
if (has_previous_gtid_log_event(log_cache, &has_prev_gtid_ev))
return 1;
if (!has_prev_gtid_ev)
return 0;
}
/*
Slave is requesting a position which is in the middle of a file,
so seek to the correct position.
*/
if (my_b_tell(log_cache) != start_pos)
my_b_seek(log_cache, start_pos);
while (!m_thd->killed)
{
my_off_t end_pos;
end_pos= get_binlog_end_pos(log_cache);
if (end_pos <= 1)
return end_pos;
if (send_events(log_cache, end_pos))
return 1;
m_thd->killed= DBUG_EVALUATE_IF("simulate_kill_dump", THD::KILL_CONNECTION,
m_thd->killed);
DBUG_EXECUTE_IF("wait_after_binlog_EOF",
{
const char act[]= "now wait_for signal.rotate_finished no_clear_event";
DBUG_ASSERT(!debug_sync_set_action(current_thd,
STRING_WITH_LEN(act)));
};);
}
return 1;
}
inline my_off_t Binlog_sender::get_binlog_end_pos(IO_CACHE *log_cache)
{
DBUG_ENTER("Binlog_sender::get_binlog_end_pos()");
my_off_t log_pos= my_b_tell(log_cache);
my_off_t end_pos= 0;
do
{
mysql_bin_log.lock_binlog_end_pos();
end_pos= mysql_bin_log.get_binlog_end_pos();
mysql_bin_log.unlock_binlog_end_pos();
if (unlikely(!mysql_bin_log.is_active(m_linfo.log_file_name)))
{
end_pos= my_b_filelength(log_cache);
if (log_pos == end_pos)
DBUG_RETURN(0); // Arrived the end of inactive file
else
DBUG_RETURN(end_pos);
}
DBUG_PRINT("info", ("Reading file %s, seek pos %llu, end_pos is %llu",
m_linfo.log_file_name, log_pos, end_pos));
DBUG_PRINT("info", ("Active file is %s", mysql_bin_log.get_log_fname()));
if (log_pos < end_pos)
DBUG_RETURN(end_pos);
/* Some data may be in net buffer, it should be flushed before waiting */
if (!m_wait_new_events || flush_net())
DBUG_RETURN(1);
if (unlikely(wait_new_events(log_pos)))
DBUG_RETURN(1);
} while (unlikely(!m_thd->killed));
DBUG_RETURN(1);
}
int Binlog_sender::send_events(IO_CACHE *log_cache, my_off_t end_pos)
{
DBUG_ENTER("Binlog_sender::send_events");
THD *thd= m_thd;
const char *log_file= m_linfo.log_file_name;
my_off_t log_pos= my_b_tell(log_cache);
my_off_t exclude_group_end_pos= 0;
bool in_exclude_group= false;
while (likely(log_pos < end_pos))
{
uchar* event_ptr;
uint32 event_len;
if (unlikely(thd->killed))
DBUG_RETURN(1);
if (unlikely(read_event(log_cache, m_event_checksum_alg,
&event_ptr, &event_len)))
DBUG_RETURN(1);
Log_event_type event_type= (Log_event_type)event_ptr[EVENT_TYPE_OFFSET];
if (unlikely(check_event_type(event_type, log_file, log_pos)))
DBUG_RETURN(1);
DBUG_EXECUTE_IF("dump_thread_wait_before_send_xid",
{
if (event_type == binary_log::XID_EVENT)
{
thd->get_protocol_classic()->flush_net();
const char act[]=
"now "
"wait_for signal.continue";
DBUG_ASSERT(opt_debug_sync_timeout > 0);
DBUG_ASSERT(!debug_sync_set_action(thd, STRING_WITH_LEN(act)));
}
});
log_pos= my_b_tell(log_cache);
if (before_send_hook(log_file, log_pos))
DBUG_RETURN(1);
/*
TODO: Set m_exclude_gtid to NULL if all gtids in m_exclude_gtid has
be skipped. and maybe removing the gtid from m_exclude_gtid will make
skip_event has better performance.
*/
if (m_exclude_gtid && (in_exclude_group= skip_event(event_ptr, event_len,
in_exclude_group)))
{
/*
If we have not send any event from past 'heartbeat_period' time
period, then it is time to send a packet before skipping this group.
*/
DBUG_EXECUTE_IF("inject_2sec_sleep_when_skipping_an_event",
{
my_sleep(2000000);
});
time_t now= time(0);
DBUG_ASSERT(now >= m_last_event_sent_ts);
bool time_for_hb_event= ((ulonglong)(now - m_last_event_sent_ts)
>= (ulonglong)(m_heartbeat_period/1000000000UL));
if (time_for_hb_event)
{
if (unlikely(send_heartbeat_event(log_pos)))
DBUG_RETURN(1);
exclude_group_end_pos= 0;
}
else
{
exclude_group_end_pos= log_pos;
}
DBUG_PRINT("info", ("Event of type %s is skipped",
Log_event::get_type_str(event_type)));
}
else
{
/*
A heartbeat is required before sending a event, If some events are
skipped. It notifies the slave to increase master_log_pos for
excluded events.
*/
if (exclude_group_end_pos)
{
/* Save a copy of the buffer content. */
String tmp;
tmp.copy(m_packet);
tmp.length(m_packet.length());
if (unlikely(send_heartbeat_event(exclude_group_end_pos)))
DBUG_RETURN(1);
exclude_group_end_pos= 0;
/* Restore the copy back. */
m_packet.copy(tmp);
m_packet.length(tmp.length());
}
if (unlikely(send_packet()))
DBUG_RETURN(1);
}
if (unlikely(after_send_hook(log_file, in_exclude_group ? log_pos : 0)))
DBUG_RETURN(1);
}
/*
A heartbeat is needed before waiting for more events, if some
events are skipped. This is needed so that the slave can increase
master_log_pos correctly.
*/
if (unlikely(in_exclude_group))
{
if (send_heartbeat_event(log_pos))
DBUG_RETURN(1);
}
DBUG_RETURN(0);
}
bool Binlog_sender::check_event_type(Log_event_type type,
const char *log_file, my_off_t log_pos)
{
if (type == binary_log::ANONYMOUS_GTID_LOG_EVENT)
{
/*
Normally, there will not be any anonymous events when
auto_position is enabled, since both the master and the slave
refuse to connect if the master is not using GTID_MODE=ON.
However, if the master changes GTID_MODE after the connection
was initialized, or if the slave requests to replicate
transactions that appear before the last anonymous event, then
this can happen. Then we generate this error to prevent sending
anonymous transactions to the slave.
*/
if (m_using_gtid_protocol)
{
DBUG_EXECUTE_IF("skip_sender_anon_autoposition_error",
{
return false;
};);
char buf[MYSQL_ERRMSG_SIZE];
sprintf(buf, ER(ER_CANT_REPLICATE_ANONYMOUS_WITH_AUTO_POSITION),
log_file, log_pos);
set_fatal_error(buf);
return true;
}
/*
Normally, there will not be any anonymous events when master has
GTID_MODE=ON, since anonymous events are not generated when
GTID_MODE=ON. However, this can happen if the master changes
GTID_MODE to ON when the slave has not yet replicated all
anonymous transactions.
*/
else if (get_gtid_mode(GTID_MODE_LOCK_NONE) == GTID_MODE_ON)
{
char buf[MYSQL_ERRMSG_SIZE];
sprintf(buf, ER(ER_CANT_REPLICATE_ANONYMOUS_WITH_GTID_MODE_ON),
log_file, log_pos);
set_fatal_error(buf);
return true;
}
}
else if (type == binary_log::GTID_LOG_EVENT)
{
/*
Normally, there will not be any GTID events when master has
GTID_MODE=OFF, since GTID events are not generated when
GTID_MODE=OFF. However, this can happen if the master changes
GTID_MODE to OFF when the slave has not yet replicated all GTID
transactions.
*/
if (get_gtid_mode(GTID_MODE_LOCK_NONE) == GTID_MODE_OFF)
{
char buf[MYSQL_ERRMSG_SIZE];
sprintf(buf, ER(ER_CANT_REPLICATE_GTID_WITH_GTID_MODE_OFF),
log_file, log_pos);
set_fatal_error(buf);
return true;
}
}
return false;
}
inline bool Binlog_sender::skip_event(const uchar *event_ptr, uint32 event_len,
bool in_exclude_group)
{
DBUG_ENTER("Binlog_sender::skip_event");
uint8 event_type= (Log_event_type) event_ptr[LOG_EVENT_OFFSET];
switch (event_type)
{
case binary_log::GTID_LOG_EVENT:
{
Format_description_log_event fd_ev(BINLOG_VERSION);
fd_ev.common_footer->checksum_alg= m_event_checksum_alg;
Gtid_log_event gtid_ev((const char *)event_ptr, event_checksum_on() ?
event_len - BINLOG_CHECKSUM_LEN : event_len,
&fd_ev);
Gtid gtid;
gtid.sidno= gtid_ev.get_sidno(m_exclude_gtid->get_sid_map());
gtid.gno= gtid_ev.get_gno();
DBUG_RETURN(m_exclude_gtid->contains_gtid(gtid));
}
case binary_log::ROTATE_EVENT:
DBUG_RETURN(false);
}
DBUG_RETURN(in_exclude_group);
}
int Binlog_sender::wait_new_events(my_off_t log_pos)
{
int ret= 0;
PSI_stage_info old_stage;
mysql_bin_log.lock_binlog_end_pos();
m_thd->ENTER_COND(mysql_bin_log.get_log_cond(),
mysql_bin_log.get_binlog_end_pos_lock(),
&stage_master_has_sent_all_binlog_to_slave,
&old_stage);
if (mysql_bin_log.get_binlog_end_pos() <= log_pos &&
mysql_bin_log.is_active(m_linfo.log_file_name))
{
if (m_heartbeat_period)
ret= wait_with_heartbeat(log_pos);
else
ret= wait_without_heartbeat();
}
mysql_bin_log.unlock_binlog_end_pos();
m_thd->EXIT_COND(&old_stage);
return ret;
}
inline int Binlog_sender::wait_with_heartbeat(my_off_t log_pos)
{
#ifndef DBUG_OFF
ulong hb_info_counter= 0;
#endif
struct timespec ts;
int ret;
do
{
set_timespec_nsec(&ts, m_heartbeat_period);
ret= mysql_bin_log.wait_for_update_bin_log(m_thd, &ts);
if (ret != ETIMEDOUT && ret != ETIME)
break;
#ifndef DBUG_OFF
if (hb_info_counter < 3)
{
sql_print_information("master sends heartbeat message");
hb_info_counter++;
if (hb_info_counter == 3)
sql_print_information("the rest of heartbeat info skipped ...");
}
#endif
if (send_heartbeat_event(log_pos))
return 1;
} while (!m_thd->killed);
return ret ? 1 : 0;
}
inline int Binlog_sender::wait_without_heartbeat()
{
return mysql_bin_log.wait_for_update_bin_log(m_thd, NULL);
}
void Binlog_sender::init_heartbeat_period()
{
my_bool null_value;
LEX_STRING name= { C_STRING_WITH_LEN("master_heartbeat_period")};
/* Protects m_thd->user_vars. */
mysql_mutex_lock(&m_thd->LOCK_thd_data);
user_var_entry *entry=
(user_var_entry*) my_hash_search(&m_thd->user_vars, (uchar*) name.str,
name.length);
m_heartbeat_period= entry ? entry->val_int(&null_value) : 0;
mysql_mutex_unlock(&m_thd->LOCK_thd_data);
}
int Binlog_sender::check_start_file()
{
char index_entry_name[FN_REFLEN];
char *name_ptr= NULL;
File file;
IO_CACHE cache;
const char *errmsg;
my_off_t size;
if (m_start_file[0] != '\0')
{
mysql_bin_log.make_log_name(index_entry_name, m_start_file);
name_ptr= index_entry_name;
}
else if (m_using_gtid_protocol)
{
/*
In normal scenarios, it is not possible that Slave will
contain more gtids than Master with resepctive to Master's
UUID. But it could be possible case if Master's binary log
is truncated(due to raid failure) or Master's binary log is
deleted but GTID_PURGED was not set properly. That scenario
needs to be validated, i.e., it should *always* be the case that
Slave's gtid executed set (+retrieved set) is a subset of
Master's gtid executed set with respective to Master's UUID.
If it happens, dump thread will be stopped during the handshake
with Slave (thus the Slave's I/O thread will be stopped with the
error. Otherwise, it can lead to data inconsistency between Master
and Slave.
*/
Sid_map* slave_sid_map= m_exclude_gtid->get_sid_map();
DBUG_ASSERT(slave_sid_map);
global_sid_lock->wrlock();
const rpl_sid &server_sid= gtid_state->get_server_sid();
rpl_sidno subset_sidno= slave_sid_map->sid_to_sidno(server_sid);
Gtid_set
gtid_executed_and_owned(gtid_state->get_executed_gtids()->get_sid_map());
// gtids = executed_gtids & owned_gtids
if (gtid_executed_and_owned.add_gtid_set(gtid_state->get_executed_gtids())
!= RETURN_STATUS_OK)
{
DBUG_ASSERT(0);
}
gtid_state->get_owned_gtids()->get_gtids(gtid_executed_and_owned);
if (!m_exclude_gtid->is_subset_for_sid(>id_executed_and_owned,
gtid_state->get_server_sidno(),
subset_sidno))
{
errmsg= ER(ER_SLAVE_HAS_MORE_GTIDS_THAN_MASTER);
global_sid_lock->unlock();
set_fatal_error(errmsg);
return 1;
}
/*
Setting GTID_PURGED (when GTID_EXECUTED set is empty i.e., when
previous_gtids are also empty) will make binlog rotate. That
leaves first binary log with empty previous_gtids and second
binary log's previous_gtids with the value of gtid_purged.
In find_first_log_not_in_gtid_set() while we search for a binary
log whose previous_gtid_set is subset of slave_gtid_executed,
in this particular case, server will always find the first binary
log with empty previous_gtids which is subset of any given
slave_gtid_executed. Thus Master thinks that it found the first
binary log which is actually not correct and unable to catch
this error situation. Hence adding below extra if condition
to check the situation. Slave should know about Master's purged GTIDs.
If Slave's GTID executed + retrieved set does not contain Master's
complete purged GTID list, that means Slave is requesting(expecting)
GTIDs which were purged by Master. We should let Slave know about the
situation. i.e., throw error if slave's GTID executed set is not
a superset of Master's purged GTID set.
The other case, where user deleted binary logs manually
(without using 'PURGE BINARY LOGS' command) but gtid_purged
is not set by the user, the following if condition cannot catch it.
But that is not a problem because in find_first_log_not_in_gtid_set()
while checking for subset previous_gtids binary log, the logic
will not find one and an error ER_MASTER_HAS_PURGED_REQUIRED_GTIDS
is thrown from there.
*/
if (!gtid_state->get_lost_gtids()->is_subset(m_exclude_gtid))
{
errmsg= ER(ER_MASTER_HAS_PURGED_REQUIRED_GTIDS);
global_sid_lock->unlock();
set_fatal_error(errmsg);
return 1;
}
global_sid_lock->unlock();
Gtid first_gtid= {0, 0};
if (mysql_bin_log.find_first_log_not_in_gtid_set(index_entry_name,
m_exclude_gtid,
&first_gtid,
&errmsg))
{
set_fatal_error(errmsg);
return 1;
}
name_ptr= index_entry_name;
/*
find_first_log_not_in_gtid_set() guarantees the file it found has
Previous_gtids_log_event as all following binlogs. So the variable is
set to false which tells not to check the event again when starting to
dump binglogs.
*/
m_check_previous_gtid_event= false;
/*
If we are skipping at least the first transaction of the binlog,
we must clear the "created" field of the FD event (set it to 0)
to avoid cleaning up temp tables on slave.
*/
m_gtid_clear_fd_created_flag= (first_gtid.sidno >= 1 &&
first_gtid.gno >= 1 &&
m_exclude_gtid->contains_gtid(first_gtid));
}
/*
Index entry name is saved into m_linfo. If name_ptr is NULL,
then starts from the first file in index file.
*/
if (mysql_bin_log.find_log_pos(&m_linfo, name_ptr, true))
{
set_fatal_error("Could not find first log file name in binary log "
"index file");
return 1;
}
if (m_start_pos < BIN_LOG_HEADER_SIZE)
{
set_fatal_error("Client requested master to start replication "
"from position < 4");
return 1;
}
if ((file= open_binlog_file(&cache, m_linfo.log_file_name, &errmsg)) < 0)
{
set_fatal_error(errmsg);
return 1;
}
size= my_b_filelength(&cache);
end_io_cache(&cache);
mysql_file_close(file, MYF(MY_WME));
if (m_start_pos > size)
{
set_fatal_error("Client requested master to start replication from "
"position > file size");
return 1;
}
return 0;
}
extern TYPELIB binlog_checksum_typelib;
void Binlog_sender::init_checksum_alg()
{
DBUG_ENTER("init_binlog_checksum");
LEX_STRING name= {C_STRING_WITH_LEN("master_binlog_checksum")};
user_var_entry *entry;
m_slave_checksum_alg= binary_log::BINLOG_CHECKSUM_ALG_UNDEF;
/* Protects m_thd->user_vars. */
mysql_mutex_lock(&m_thd->LOCK_thd_data);
entry= (user_var_entry*) my_hash_search(&m_thd->user_vars,
(uchar*) name.str, name.length);
if (entry)
{
m_slave_checksum_alg=
static_cast<enum_binlog_checksum_alg>(find_type((char*) entry->ptr(), &binlog_checksum_typelib, 1) - 1);
DBUG_ASSERT(m_slave_checksum_alg < binary_log::BINLOG_CHECKSUM_ALG_ENUM_END);
}
mysql_mutex_unlock(&m_thd->LOCK_thd_data);
/*
m_event_checksum_alg should be set to the checksum algorithm in
Format_description_log_event. But it is used by fake_rotate_event() which
will be called before reading any Format_description_log_event. In that case,
m_slave_checksum_alg is set as the value of m_event_checksum_alg.
*/
m_event_checksum_alg= m_slave_checksum_alg;
DBUG_VOID_RETURN;
}
int Binlog_sender::fake_rotate_event(const char *next_log_file,
my_off_t log_pos)
{
DBUG_ENTER("fake_rotate_event");
const char* p = next_log_file + dirname_length(next_log_file);
size_t ident_len = strlen(p);
size_t event_len = ident_len + LOG_EVENT_HEADER_LEN + Binary_log_event::ROTATE_HEADER_LEN +
(event_checksum_on() ? BINLOG_CHECKSUM_LEN : 0);
/* reset transmit packet for the fake rotate event below */
if (reset_transmit_packet(0, event_len))
DBUG_RETURN(1);
size_t event_offset= m_packet.length();
m_packet.length(event_len + event_offset);
uchar *header= (uchar *)m_packet.ptr() + event_offset;
uchar *rotate_header= header + LOG_EVENT_HEADER_LEN;
/*
'when' (the timestamp) is set to 0 so that slave could distinguish between
real and fake Rotate events (if necessary)
*/
int4store(header, 0);
header[EVENT_TYPE_OFFSET] = binary_log::ROTATE_EVENT;
int4store(header + SERVER_ID_OFFSET, server_id);
int4store(header + EVENT_LEN_OFFSET, static_cast<uint32>(event_len));
int4store(header + LOG_POS_OFFSET, 0);
int2store(header + FLAGS_OFFSET, LOG_EVENT_ARTIFICIAL_F);
int8store(rotate_header, log_pos);
memcpy(rotate_header + Binary_log_event::ROTATE_HEADER_LEN, p, ident_len);
if (event_checksum_on())
calc_event_checksum(header, event_len);
DBUG_RETURN(send_packet());
}
inline void Binlog_sender::calc_event_checksum(uchar *event_ptr, size_t event_len)
{
ha_checksum crc= checksum_crc32(0L, NULL, 0);
crc= checksum_crc32(crc, event_ptr, event_len - BINLOG_CHECKSUM_LEN);
int4store(event_ptr + event_len - BINLOG_CHECKSUM_LEN, crc);
}
inline int Binlog_sender::reset_transmit_packet(ushort flags, size_t event_len)
{
DBUG_ENTER("Binlog_sender::reset_transmit_packet");
DBUG_PRINT("info", ("event_len: %zu, m_packet->alloced_length: %zu",
event_len, m_packet.alloced_length()));
DBUG_ASSERT(m_packet.alloced_length() >= PACKET_MIN_SIZE);
m_packet.length(0); // size of the content
m_packet.qs_append('\0'); // Set this as an OK packet
/* reserve and set default header */
if (m_observe_transmission &&
RUN_HOOK(binlog_transmit, reserve_header, (m_thd, flags, &m_packet)))
{
set_unknow_error("Failed to run hook 'reserve_header'");
DBUG_RETURN(1);
}
/* Resizes the buffer if needed. */
if (grow_packet(event_len))
DBUG_RETURN(1);
DBUG_PRINT("info", ("m_packet.alloced_length: %zu (after potential "
"reallocation)", m_packet.alloced_length()));
DBUG_RETURN(0);
}
int Binlog_sender::send_format_description_event(IO_CACHE *log_cache,
my_off_t start_pos)
{
DBUG_ENTER("Binlog_sender::send_format_description_event");
uchar* event_ptr;
uint32 event_len;
if (read_event(log_cache, binary_log::BINLOG_CHECKSUM_ALG_OFF, &event_ptr,
&event_len))
DBUG_RETURN(1);
DBUG_PRINT("info",
("Looked for a Format_description_log_event, found event type %s",
Log_event::get_type_str((Log_event_type) event_ptr[EVENT_TYPE_OFFSET])));
if (event_ptr[EVENT_TYPE_OFFSET] != binary_log::FORMAT_DESCRIPTION_EVENT)
{
set_fatal_error("Could not find format_description_event in binlog file");
DBUG_RETURN(1);
}
DBUG_ASSERT(event_ptr[LOG_POS_OFFSET] > 0);
m_event_checksum_alg=
Log_event_footer::get_checksum_alg((const char *)event_ptr, event_len);
DBUG_ASSERT(m_event_checksum_alg < binary_log::BINLOG_CHECKSUM_ALG_ENUM_END ||
m_event_checksum_alg == binary_log::BINLOG_CHECKSUM_ALG_UNDEF);
/* Slave does not support checksum, but binary events include checksum */
if (m_slave_checksum_alg == binary_log::BINLOG_CHECKSUM_ALG_UNDEF &&
event_checksum_on())
{
set_fatal_error("Slave can not handle replication events with the "
"checksum that master is configured to log");
sql_print_warning("Master is configured to log replication events "
"with checksum, but will not send such events to "
"slaves that cannot process them");
DBUG_RETURN(1);
}
event_ptr[FLAGS_OFFSET] &= ~LOG_EVENT_BINLOG_IN_USE_F;
bool event_updated= false;
if (m_using_gtid_protocol)
{
if (m_gtid_clear_fd_created_flag)
{