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rpl_replica.cc
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/* Copyright (c) 2000, 2024, 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, version 2.0,
as published by the Free Software Foundation.
This program is designed to work with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have either included with
the program or referenced in the documentation.
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, version 2.0, 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 02110-1301 USA */
/**
@addtogroup Replication
@{
@file sql/rpl_replica.cc
@brief Code to run the io thread and the sql thread on the
replication slave.
*/
#include "sql/rpl_replica.h"
#include "my_config.h"
#include <errno.h>
#include <fcntl.h>
#include <math.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "include/compression.h"
#include "include/mutex_lock.h"
#include "m_string.h"
#include "mysql/components/services/bits/psi_bits.h"
#include "mysql/components/services/bits/psi_memory_bits.h"
#include "mysql/components/services/bits/psi_stage_bits.h"
#include "mysql/components/services/log_builtins.h"
#include "mysql/plugin.h"
#include "mysql/psi/mysql_cond.h"
#include "mysql/psi/mysql_mutex.h"
#include "mysql/status_var.h"
#include "mysql/strings/int2str.h"
#include "sql/changestreams/apply/replication_thread_status.h"
#include "sql/rpl_channel_service_interface.h"
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#include <time.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <algorithm>
#include <atomic>
#include <deque>
#include <map>
#include <regex>
#include <string>
#include <utility>
#include <vector>
#include "errmsg.h" // CR_*
#include "lex_string.h"
#include "mutex_lock.h" // MUTEX_LOCK
#include "my_bitmap.h" // MY_BITMAP
#include "my_byteorder.h"
#include "my_command.h"
#include "my_compiler.h"
#include "my_dbug.h"
#include "my_dir.h"
#include "my_io.h"
#include "my_macros.h"
#include "my_sys.h"
#include "my_systime.h"
#include "my_thread_local.h" // thread_local_key_t
#include "mysql.h" // MYSQL
#include "mysql/binlog/event/binlog_event.h"
#include "mysql/binlog/event/control_events.h"
#include "mysql/binlog/event/debug_vars.h"
#include "mysql/my_loglevel.h"
#include "mysql/psi/mysql_file.h"
#include "mysql/psi/mysql_memory.h"
#include "mysql/psi/mysql_thread.h"
#include "mysql/service_mysql_alloc.h"
#include "mysql/strings/m_ctype.h"
#include "mysql/thread_type.h"
#include "mysql_com.h"
#include "mysqld_error.h"
#include "pfs_thread_provider.h"
#include "prealloced_array.h"
#include "sql-common/net_ns.h"
#include "sql/auth/auth_acls.h"
#include "sql/auth/sql_security_ctx.h"
#include "sql/auto_thd.h"
#include "sql/binlog.h"
#include "sql/binlog_reader.h"
#include "sql/clone_handler.h" // is_provisioning
#include "sql/current_thd.h"
#include "sql/debug_sync.h" // DEBUG_SYNC
#include "sql/derror.h" // ER_THD
#include "sql/dynamic_ids.h" // Server_ids
#include "sql/handler.h"
#include "sql/item.h"
#include "sql/log.h"
#include "sql/log_event.h" // Rotate_log_event
#include "sql/mdl.h"
#include "sql/mysqld.h" // ER
#include "sql/mysqld_thd_manager.h" // Global_THD_manager
#include "sql/protocol.h"
#include "sql/protocol_classic.h"
#include "sql/psi_memory_key.h"
#include "sql/query_options.h"
#include "sql/rpl_applier_reader.h"
#include "sql/rpl_async_conn_failover.h"
#include "sql/rpl_async_conn_failover_configuration_propagation.h"
#include "sql/rpl_filter.h"
#include "sql/rpl_group_replication.h"
#include "sql/rpl_gtid.h"
#include "sql/rpl_handler.h" // RUN_HOOK
#include "sql/rpl_info.h"
#include "sql/rpl_info_factory.h" // Rpl_info_factory
#include "sql/rpl_info_handler.h"
#include "sql/rpl_io_monitor.h"
#include "sql/rpl_mi.h"
#include "sql/rpl_msr.h" // Multisource_info
#include "sql/rpl_mta_submode.h"
#include "sql/rpl_opt_tracker.h"
#include "sql/rpl_replica_commit_order_manager.h" // Commit_order_manager
#include "sql/rpl_replica_until_options.h"
#include "sql/rpl_reporting.h"
#include "sql/rpl_rli.h" // Relay_log_info
#include "sql/rpl_rli_pdb.h" // Slave_worker
#include "sql/rpl_trx_boundary_parser.h"
#include "sql/rpl_utility.h"
#include "sql/sql_backup_lock.h" // is_instance_backup_locked
#include "sql/sql_class.h" // THD
#include "sql/sql_const.h"
#include "sql/sql_error.h"
#include "sql/sql_lex.h"
#include "sql/sql_list.h"
#include "sql/sql_parse.h" // execute_init_command
#include "sql/sql_plugin.h" // opt_plugin_dir_ptr
#include "sql/system_variables.h"
#include "sql/table.h"
#include "sql/transaction.h" // trans_begin
#include "sql/transaction_info.h"
#include "sql_common.h" // end_server
#include "sql_string.h"
#include "str2int.h"
#include "string_with_len.h"
#include "strmake.h"
#include "typelib.h"
#ifndef NDEBUG
#include "rpl_debug_points.h"
#endif
#include "scope_guard.h"
struct mysql_cond_t;
struct mysql_mutex_t;
using mysql::binlog::event::Binary_log_event;
using mysql::binlog::event::checksum_crc32;
using mysql::binlog::event::enum_binlog_checksum_alg;
using mysql::binlog::event::Log_event_footer;
using mysql::binlog::event::Log_event_type;
using mysql::binlog::event::Log_event_type_helper;
using std::max;
using std::min;
#define FLAGSTR(V, F) ((V) & (F) ? #F " " : "")
/*
a parameter of sql_slave_killed() to defer the killed status
*/
#define SLAVE_WAIT_GROUP_DONE 60
bool use_slave_mask = false;
MY_BITMAP slave_error_mask;
char slave_skip_error_names[SHOW_VAR_FUNC_BUFF_SIZE];
char *replica_load_tmpdir = nullptr;
bool replicate_same_server_id;
ulonglong relay_log_space_limit = 0;
const char *relay_log_index = nullptr;
const char *relay_log_basename = nullptr;
/*
MTS load-ballancing parameter.
Max length of one MTS Worker queue. The value also determines the size
of Relay_log_info::gaq (see @c slave_start_workers()).
It can be set to any value in [1, ULONG_MAX - 1] range.
*/
const ulong mts_slave_worker_queue_len_max = 16384;
/*
MTS load-ballancing parameter.
Time unit in microsecs to sleep by MTS Coordinator to avoid extra thread
signalling in the case of Worker queues are close to be filled up.
*/
const ulong mts_coordinator_basic_nap = 5;
/*
MTS load-ballancing parameter.
Percent of Worker queue size at which Worker is considered to become
hungry.
C enqueues --+ . underrun level
V "
+----------+-+------------------+--------------+
| empty |.|::::::::::::::::::|xxxxxxxxxxxxxx| ---> Worker dequeues
+----------+-+------------------+--------------+
Like in the above diagram enqueuing to the x-d area would indicate
actual underrruning by Worker.
*/
const ulong mts_worker_underrun_level = 10;
/*
When slave thread exits, we need to remember the temporary tables so we
can re-use them on slave start.
*/
static thread_local Master_info *RPL_MASTER_INFO = nullptr;
/**
Encapsulates the messages and thread stages used for a specific call
to try_to_reconnect. Different Reconnect_messages objects may be
used by the caller of try_to_reconnect in order to make the errors
and stages include text that describes the reason for the reconnect.
*/
struct Reconnect_messages {
/// Stage used while waiting to reconnect
PSI_stage_info &stage_waiting_to_reconnect;
/// Error reported in case the thread is killed while waiting
std::string error_killed_while_waiting;
/// Stage used while reconnecting
PSI_stage_info &stage_reconnecting;
/// Description of the condition that caused the thread to reconnect
std::string triggering_error;
/**
The string representation of the enum_server_command that had been
sent to the source before condition that caused the thread to
reconnect happened.
*/
std::string triggering_command;
};
static Reconnect_messages reconnect_messages_after_failed_registration{
stage_replica_waiting_to_reconnect_after_failed_registration_on_source,
"Replica I/O thread killed while waiting to reconnect after a failed "
"registration on source",
stage_replica_reconnecting_after_failed_registration_on_source,
"failed registering on source, reconnecting to try again, "
"log '%s' at position %s",
"COM_REGISTER_REPLICA"};
static Reconnect_messages reconnect_messages_after_failed_dump{
stage_replica_waiting_to_reconnect_after_failed_binlog_dump_request,
"Replica I/O thread killed while retrying source dump",
stage_replica_reconnecting_after_failed_binlog_dump_request,
"failed dump request, reconnecting to try again, log '%s' at position "
"%s",
"COM_BINLOG_DUMP"};
static Reconnect_messages reconnect_messages_after_failed_event_read{
stage_replica_waiting_to_reconnect_after_failed_event_read,
"Replica I/O thread killed while waiting to reconnect after a failed read",
stage_replica_reconnecting_after_failed_event_read,
"Replica I/O thread: Failed reading log event, reconnecting to retry, "
"log '%s' at position %s",
""};
enum enum_slave_apply_event_and_update_pos_retval {
SLAVE_APPLY_EVENT_AND_UPDATE_POS_OK = 0,
SLAVE_APPLY_EVENT_AND_UPDATE_POS_APPLY_ERROR = 1,
SLAVE_APPLY_EVENT_AND_UPDATE_POS_UPDATE_POS_ERROR = 2,
SLAVE_APPLY_EVENT_AND_UPDATE_POS_APPEND_JOB_ERROR = 3,
SLAVE_APPLY_EVENT_RETRY = 4,
SLAVE_APPLY_EVENT_UNTIL_REACHED = 5,
SLAVE_APPLY_EVENT_AND_UPDATE_POS_MAX
};
static int process_io_rotate(Master_info *mi, Rotate_log_event *rev);
/// @brief Checks whether relay log space will be exceeded after queueing
/// additional 'queued_size' bytes. If yes, function will
/// request relay log purge, rotate the relay log and wait for notification
/// from coordinator
/// @retval true Event may be queued by the receiver
/// @retval false Failed to reclaim required relay log space
static inline bool wait_for_relay_log_space(Relay_log_info *rli,
std::size_t queued_size);
/// @brief Checks whether relay log space limit will be exceeded after queueing
/// additional 'queued_size' bytes
/// @param rli Pointer to connection metadata object for the considered channel
/// @param queued_size Number of bytes we want to queue
/// @retval true Limit exceeded
/// @retval false Current size + 'queued_size' is within limits
static inline bool exceeds_relay_log_limit(Relay_log_info *rli,
std::size_t queued_size);
static inline bool io_slave_killed(THD *thd, Master_info *mi);
static inline bool monitor_io_replica_killed(THD *thd, Master_info *mi);
static inline bool is_autocommit_off(THD *thd);
static void print_replica_skip_errors(void);
static int safe_connect(THD *thd, MYSQL *mysql, Master_info *mi,
const std::string &host = std::string(),
const uint port = 0);
static int safe_reconnect(THD *thd, MYSQL *mysql, Master_info *mi,
bool suppress_warnings,
const std::string &host = std::string(),
const uint port = 0);
static int get_master_version_and_clock(MYSQL *mysql, Master_info *mi);
static int get_master_uuid(MYSQL *mysql, Master_info *mi);
int io_thread_init_commands(MYSQL *mysql, Master_info *mi);
static int terminate_slave_thread(THD *thd, mysql_mutex_t *term_lock,
mysql_cond_t *term_cond,
std::atomic<uint> *slave_running,
ulong *stop_wait_timeout, bool need_lock_term,
bool force = false);
static bool check_io_slave_killed(THD *thd, Master_info *mi, const char *info);
static int mts_event_coord_cmp(LOG_POS_COORD *id1, LOG_POS_COORD *id2);
static int check_slave_sql_config_conflict(const Relay_log_info *rli);
static void group_replication_cleanup_after_clone();
static void check_replica_configuration_restrictions();
static bool check_replica_configuration_errors(Master_info *mi,
int thread_mask);
/*
Applier thread InnoDB priority.
When two transactions conflict inside InnoDB, the one with
greater priority wins.
@param thd Thread handler for slave
@param priority Thread priority
*/
static void set_thd_tx_priority(THD *thd, int priority) {
DBUG_TRACE;
assert(thd->system_thread == SYSTEM_THREAD_SLAVE_SQL ||
thd->system_thread == SYSTEM_THREAD_SLAVE_WORKER);
thd->thd_tx_priority = priority;
DBUG_EXECUTE_IF("dbug_set_high_prio_sql_thread",
{ thd->thd_tx_priority = 1; });
}
/**
Set for the thread options about the memory and size limits when
transactions collect write sets.
@param thd Thread handler
@param ignore_limit if the memory limits should be ignored
@param allow_drop_write_set if this thread does not require WS to always be
logged
*/
static void set_thd_write_set_options(THD *thd, bool ignore_limit,
bool allow_drop_write_set) {
DBUG_TRACE;
thd->get_transaction()
->get_transaction_write_set_ctx()
->set_local_ignore_write_set_memory_limit(ignore_limit);
thd->get_transaction()
->get_transaction_write_set_ctx()
->set_local_allow_drop_write_set(allow_drop_write_set);
}
/*
Function to set the slave's max_allowed_packet based on the value
of replica_max_allowed_packet.
@in_param thd Thread handler for slave
@in_param mysql MySQL connection handle
*/
static void set_replica_max_allowed_packet(THD *thd, MYSQL *mysql) {
DBUG_TRACE;
// thd and mysql must be valid
assert(thd && mysql);
thd->variables.max_allowed_packet = replica_max_allowed_packet;
/*
Adding MAX_LOG_EVENT_HEADER_LEN to the max_packet_size on the I/O
thread and the mysql->option max_allowed_packet, since a
replication event can become this much larger than
the corresponding packet (query) sent from client to master.
*/
thd->get_protocol_classic()->set_max_packet_size(replica_max_allowed_packet +
MAX_LOG_EVENT_HEADER);
/*
Skipping the setting of mysql->net.max_packet size to slave
max_allowed_packet since this is done during mysql_real_connect.
*/
mysql->options.max_allowed_packet =
replica_max_allowed_packet + MAX_LOG_EVENT_HEADER;
}
#ifdef HAVE_PSI_INTERFACE
static PSI_memory_key key_memory_rli_mta_coor;
static PSI_thread_key key_thread_replica_io, key_thread_replica_sql,
key_thread_replica_worker, key_thread_replica_monitor_io;
static PSI_thread_info all_slave_threads[] = {
{&key_thread_replica_io, "replica_io", "rpl_rca_io", PSI_FLAG_THREAD_SYSTEM,
0, PSI_DOCUMENT_ME},
{&key_thread_replica_sql, "replica_sql", "rpl_rca_sql",
PSI_FLAG_THREAD_SYSTEM, 0, PSI_DOCUMENT_ME},
{&key_thread_replica_worker, "replica_worker", "rpl_rca_wkr",
PSI_FLAG_THREAD_SYSTEM, 0, PSI_DOCUMENT_ME},
{&key_thread_replica_monitor_io, "replica_monitor", "rpl_rca_mon",
PSI_FLAG_SINGLETON | PSI_FLAG_THREAD_SYSTEM, 0, PSI_DOCUMENT_ME}};
static PSI_memory_info all_slave_memory[] = {{&key_memory_rli_mta_coor,
"Relay_log_info::mta_coor", 0, 0,
PSI_DOCUMENT_ME}};
#endif /* HAVE_PSI_INTERFACE */
/* Initialize slave structures */
int ReplicaInitializer::get_initialization_code() const { return m_init_code; }
ReplicaInitializer::ReplicaInitializer(bool opt_initialize,
bool opt_skip_replica_start,
Rpl_channel_filters &filters,
char **replica_skip_erors)
: m_opt_initialize_replica(!opt_initialize),
m_opt_skip_replica_start(opt_initialize),
m_thread_mask(REPLICA_SQL | REPLICA_IO) {
if (m_opt_initialize_replica) {
// Make @@replica_skip_errors show the nice human-readable value.
set_replica_skip_errors(replica_skip_erors);
/*
Group replication filters should be discarded before init_replica(),
otherwise the pre-configured filters will be referenced by group
replication channels.
*/
filters.discard_group_replication_filters();
/*
init_replica() must be called after the thread keys are created.
*/
if (server_id != 0) {
m_init_code = init_replica();
}
start_replication_threads(opt_skip_replica_start);
/*
If the user specifies a per-channel replication filter through a
command-line option (or in a configuration file) for a slave
replication channel which does not exist as of now (i.e not
present in slave info tables yet), then the per-channel
replication filter is discarded with a warning.
If the user specifies a per-channel replication filter through
a command-line option (or in a configuration file) for group
replication channels 'group_replication_recovery' and
'group_replication_applier' which is disallowed, then the
per-channel replication filter is discarded with a warning.
*/
filters.discard_all_unattached_filters();
}
}
void ReplicaInitializer::print_channel_info() const {
#ifndef NDEBUG
/* @todo: Print it for all the channels */
{
Master_info *default_mi;
default_mi = channel_map.get_default_channel_mi();
if (default_mi && default_mi->rli) {
DBUG_PRINT(
"info",
("init group source %s %lu group replica %s %lu event %s %lu\n",
default_mi->rli->get_group_master_log_name(),
(ulong)default_mi->rli->get_group_master_log_pos(),
default_mi->rli->get_group_relay_log_name(),
(ulong)default_mi->rli->get_group_relay_log_pos(),
default_mi->rli->get_event_relay_log_name(),
(ulong)default_mi->rli->get_event_relay_log_pos()));
}
}
#endif
}
void ReplicaInitializer::start_replication_threads(bool skip_replica_start) {
if (!m_opt_skip_replica_start && !skip_replica_start) {
start_threads();
}
}
void ReplicaInitializer::start_threads() {
/*
Loop through the channel_map and start replica threads for each channel.
*/
for (mi_map::iterator it = channel_map.begin(); it != channel_map.end();
it++) {
Master_info *mi = it->second;
/* If server id is not set, start_slave_thread() will say it */
if (Master_info::is_configured(mi) && mi->rli->inited) {
/* same as in start_slave() cache the global var values into rli's
* members */
mi->rli->opt_replica_parallel_workers = opt_mts_replica_parallel_workers;
mi->rli->checkpoint_group = opt_mta_checkpoint_group;
if (mts_parallel_option == MTS_PARALLEL_TYPE_DB_NAME)
mi->rli->channel_mts_submode = MTS_PARALLEL_TYPE_DB_NAME;
else
mi->rli->channel_mts_submode = MTS_PARALLEL_TYPE_LOGICAL_CLOCK;
if (mi->is_source_connection_auto_failover())
m_thread_mask |= SLAVE_MONITOR;
mi->set_applier_metric_collection_status(
opt_collect_replica_applier_metrics);
if (start_slave_threads(true /*need_lock_slave=true*/,
false /*wait_for_start=false*/, mi,
m_thread_mask)) {
LogErr(ERROR_LEVEL, ER_FAILED_TO_START_REPLICA_THREAD,
mi->get_channel());
}
} else {
LogErr(INFORMATION_LEVEL, ER_FAILED_TO_START_REPLICA_THREAD,
mi->get_channel());
}
}
}
void ReplicaInitializer::init_replica_psi_keys() {
#ifdef HAVE_PSI_INTERFACE
const char *category = "sql";
int count;
count = static_cast<int>(array_elements(all_slave_threads));
mysql_thread_register(category, all_slave_threads, count);
count = static_cast<int>(array_elements(all_slave_memory));
mysql_memory_register(category, all_slave_memory, count);
#endif // HAVE_PSI_INTERFACE
}
int ReplicaInitializer::init_replica() {
DBUG_TRACE;
int error = 0;
#ifdef HAVE_PSI_INTERFACE
init_replica_psi_keys();
#endif
/*
This is called when mysqld starts. Before client connections are
accepted. However bootstrap may conflict with us if it does START REPLICA.
So it's safer to take the lock.
*/
channel_map.wrlock();
Scope_guard channel_map_guard([&error]() {
channel_map.unlock();
if (error)
LogErr(INFORMATION_LEVEL, ER_REPLICA_NOT_STARTED_ON_SOME_CHANNELS);
});
RPL_MASTER_INFO = nullptr;
/*
Create slave info objects by reading repositories of individual
channels and add them into channel_map
*/
if ((error = Rpl_info_factory::create_slave_info_objects(
INFO_REPOSITORY_TABLE, INFO_REPOSITORY_TABLE, m_thread_mask,
&channel_map)))
LogErr(ERROR_LEVEL,
ER_RPL_REPLICA_FAILED_TO_CREATE_OR_RECOVER_INFO_REPOSITORIES);
group_replication_cleanup_after_clone();
print_channel_info();
check_replica_configuration_restrictions();
if (check_slave_sql_config_conflict(nullptr)) {
error = 1;
return error;
}
return error;
}
/**
Function to start a slave for all channels.
Used in Multisource replication.
@param[in] thd THD object of the client.
@retval false success
@retval true error
@todo It is good to continue to start other channels
when a slave start failed for other channels.
@todo The problem with the below code is if the slave is already
stared, we would have multiple warnings
"Replica was already running" for each channel.
A nice warning message would be to add
"Replica for channel '%s' was already running"
but error messages are in different languages and cannot be tampered
with so, we have to handle it case by case basis, whether
only default channel exists or not and properly continue with
starting other channels if one channel fails clearly giving
an error message by displaying failed channels.
*/
bool start_slave(THD *thd) {
DBUG_TRACE;
Master_info *mi;
bool channel_configured, error = false;
if (channel_map.get_num_instances() == 1) {
mi = channel_map.get_default_channel_mi();
assert(mi);
if (start_slave(thd, &thd->lex->replica_connection, &thd->lex->mi,
thd->lex->replica_thd_opt, mi, true))
return true;
} else {
/*
Users cannot start more than one channel's applier thread
if sql_replica_skip_counter > 0. It throws an error to the session.
*/
mysql_mutex_lock(&LOCK_sql_replica_skip_counter);
/* sql_replica_skip_counter > 0 && !(START REPLICA IO_THREAD) */
if (sql_replica_skip_counter > 0 &&
!(thd->lex->replica_thd_opt & REPLICA_IO)) {
my_error(ER_REPLICA_CHANNEL_SQL_SKIP_COUNTER, MYF(0));
mysql_mutex_unlock(&LOCK_sql_replica_skip_counter);
return true;
}
mysql_mutex_unlock(&LOCK_sql_replica_skip_counter);
for (mi_map::iterator it = channel_map.begin(); it != channel_map.end();
it++) {
mi = it->second;
channel_configured =
mi && // Master_info exists
(mi->inited || mi->reset) // It is inited or was reset
&& mi->host[0]; // host is set
if (channel_configured) {
if (start_slave(thd, &thd->lex->replica_connection, &thd->lex->mi,
thd->lex->replica_thd_opt, mi, true)) {
LogErr(ERROR_LEVEL, ER_RPL_REPLICA_CANT_START_REPLICA_FOR_CHANNEL,
mi->get_channel());
error = true;
}
}
}
}
if (!error) {
/* no error */
my_ok(thd);
}
return error;
}
/**
Function to stop a slave for all channels.
Used in Multisource replication.
@param[in] thd THD object of the client.
@retval 0 success
@retval 1 error
@todo It is good to continue to stop other channels
when a slave start failed for other channels.
*/
int stop_slave(THD *thd) {
DBUG_TRACE;
bool push_temp_table_warning = true;
Master_info *mi = nullptr;
int error = 0;
if (channel_map.get_num_instances() == 1) {
mi = channel_map.get_default_channel_mi();
assert(!strcmp(mi->get_channel(), channel_map.get_default_channel()));
error = stop_slave(thd, mi, true, false /*for_one_channel*/,
&push_temp_table_warning);
} else {
for (mi_map::iterator it = channel_map.begin(); it != channel_map.end();
it++) {
mi = it->second;
if (Master_info::is_configured(mi)) {
if (stop_slave(thd, mi, true, false /*for_one_channel*/,
&push_temp_table_warning)) {
LogErr(ERROR_LEVEL, ER_RPL_REPLICA_CANT_STOP_REPLICA_FOR_CHANNEL,
mi->get_channel());
error = 1;
}
}
}
}
if (!error) {
/* no error */
my_ok(thd);
}
return error;
}
/**
Entry point to the START REPLICA command. The function
decides to start replication threads on several channels
or a single given channel.
@param[in] thd the client thread carrying the command.
@retval false ok
@retval true not ok.
*/
bool start_slave_cmd(THD *thd) {
DBUG_TRACE;
Master_info *mi;
LEX *lex = thd->lex;
bool res = true; /* default, an error */
DEBUG_SYNC(thd, "begin_start_replica");
channel_map.wrlock();
DEBUG_SYNC(thd, "after_locking_channel_map_in_start_replica");
if (!is_slave_configured()) {
my_error(ER_REPLICA_CONFIGURATION, MYF(0));
goto err;
}
if (!lex->mi.for_channel) {
/*
If replica_until options are provided when multiple channels exist
without explicitly providing FOR CHANNEL clause, error out.
*/
if (lex->mi.replica_until && channel_map.get_num_instances() > 1) {
my_error(ER_REPLICA_MULTIPLE_CHANNELS_CMD, MYF(0));
goto err;
}
res = start_slave(thd);
} else {
mi = channel_map.get_mi(lex->mi.channel);
/*
If the channel being used is a group replication channel we need to
disable this command here as, in some cases, group replication does not
support them.
For channel group_replication_applier we disable START REPLICA [IO_THREAD]
command.
For channel group_replication_recovery we disable START REPLICA command
and its two thread variants.
*/
if (mi &&
channel_map.is_group_replication_channel_name(mi->get_channel()) &&
((!thd->lex->replica_thd_opt ||
(thd->lex->replica_thd_opt & REPLICA_IO)) ||
(!(channel_map.is_group_replication_applier_channel_name(
mi->get_channel())) &&
(thd->lex->replica_thd_opt & REPLICA_SQL)))) {
const char *command = "START REPLICA FOR CHANNEL";
if (thd->lex->replica_thd_opt & REPLICA_IO)
command = "START REPLICA IO_THREAD FOR CHANNEL";
else if (thd->lex->replica_thd_opt & REPLICA_SQL)
command = "START REPLICA SQL_THREAD FOR CHANNEL";
my_error(ER_REPLICA_CHANNEL_OPERATION_NOT_ALLOWED, MYF(0), command,
mi->get_channel());
goto err;
}
/*
START REPLICA for channel group_replication_applier is disallowed while
Group Replication is running.
*/
if (mi &&
channel_map.is_group_replication_applier_channel_name(
mi->get_channel()) &&
is_group_replication_running()) {
const char *command =
"START REPLICA FOR CHANNEL while Group Replication is running";
my_error(ER_REPLICA_CHANNEL_OPERATION_NOT_ALLOWED, MYF(0), command,
mi->get_channel());
goto err;
}
if (mi)
res = start_slave(thd, &thd->lex->replica_connection, &thd->lex->mi,
thd->lex->replica_thd_opt, mi, true);
else if (strcmp(channel_map.get_default_channel(), lex->mi.channel))
my_error(ER_REPLICA_CHANNEL_DOES_NOT_EXIST, MYF(0), lex->mi.channel);
if (!res) my_ok(thd);
}
err:
channel_map.unlock();
return res;
}
/**
Entry point for the STOP REPLICA command. This function stops replication
threads for all channels or a single channel based on the command
options supplied.
@param[in] thd the client thread.
@retval false ok
@retval true not ok.
*/
bool stop_slave_cmd(THD *thd) {
DBUG_TRACE;
Master_info *mi;
bool push_temp_table_warning = true;
LEX *lex = thd->lex;
bool res = true; /*default, an error */
channel_map.rdlock();
if (!is_slave_configured()) {
my_error(ER_REPLICA_CONFIGURATION, MYF(0));
channel_map.unlock();
return true;
}
MDL_lock_guard backup_sentry{thd};
/* During provisioning we stop replica after acquiring backup lock. */
if (!Clone_handler::is_provisioning() &&
(!thd->lex->replica_thd_opt ||
(thd->lex->replica_thd_opt & REPLICA_SQL))) {
if (backup_sentry.lock(MDL_key::BACKUP_LOCK, MDL_INTENTION_EXCLUSIVE)) {
my_error(ER_RPL_CANT_STOP_REPLICA_WHILE_LOCKED_BACKUP, MYF(0));
channel_map.unlock();
return true;
}
}
if (!lex->mi.for_channel)
res = stop_slave(thd);
else {
mi = channel_map.get_mi(lex->mi.channel);
/*
If the channel being used is a group replication channel we need to
disable this command here as, in some cases, group replication does not
support them.
For channel group_replication_applier we disable STOP REPLICA [IO_THREAD]
command.
For channel group_replication_recovery we disable STOP REPLICA command
and its two thread variants.
*/
if (mi &&
channel_map.is_group_replication_channel_name(mi->get_channel()) &&
((!thd->lex->replica_thd_opt ||
(thd->lex->replica_thd_opt & REPLICA_IO)) ||
(!(channel_map.is_group_replication_applier_channel_name(
mi->get_channel())) &&
(thd->lex->replica_thd_opt & REPLICA_SQL)))) {
const char *command = "STOP REPLICA FOR CHANNEL";
if (thd->lex->replica_thd_opt & REPLICA_IO)
command = "STOP REPLICA IO_THREAD FOR CHANNEL";
else if (thd->lex->replica_thd_opt & REPLICA_SQL)
command = "STOP REPLICA SQL_THREAD FOR CHANNEL";
my_error(ER_REPLICA_CHANNEL_OPERATION_NOT_ALLOWED, MYF(0), command,
mi->get_channel());
channel_map.unlock();
return true;
}
/*
STOP REPLICA for channel group_replication_applier is disallowed while
Group Replication is running.
*/
if (mi &&
channel_map.is_group_replication_applier_channel_name(
mi->get_channel()) &&
is_group_replication_running()) {
const char *command =
"STOP REPLICA FOR CHANNEL while Group Replication is running";
my_error(ER_REPLICA_CHANNEL_OPERATION_NOT_ALLOWED, MYF(0), command,
mi->get_channel());
channel_map.unlock();
return true;
}
if (mi)
res = stop_slave(thd, mi, true /*net report */, true /*for_one_channel*/,
&push_temp_table_warning);
else if (strcmp(channel_map.get_default_channel(), lex->mi.channel))
my_error(ER_REPLICA_CHANNEL_DOES_NOT_EXIST, MYF(0), lex->mi.channel);
}
channel_map.unlock();
DBUG_EXECUTE_IF("stop_replica_dont_release_backup_lock", {
rpl_replica_debug_point(DBUG_RPL_S_STOP_SLAVE_BACKUP_LOCK, thd);
});
return res;
}
enum enum_read_rotate_from_relay_log_status {
FOUND_ROTATE,
NOT_FOUND_ROTATE,
ERROR
};
/**
Parse the given relay log and identify the rotate event from the master.
Ignore the Format description event, Previous_gtid log event, ignorable
event and Stop event within the relay log as they are generated by slave.
When a rotate event is found check if it is a rotate that is originated from
the master based on the server_id. Ignore the event if the rotate is from
slave or if it is a fake rotate event. If any other events are encountered
apart from the above events generate an error. From the rotate event
extract the master's binary log name and position.
@param filename
Relay log name which needs to be parsed.
@param[out] source_log_file
Set the source_log_file to the log file name that is extracted from
rotate event. The source_log_file should contain string of len
FN_REFLEN.
@param[out] master_log_pos
Set the master_log_pos to the log position extracted from rotate
event.
@retval FOUND_ROTATE: When rotate event is found in the relay log
@retval NOT_FOUND_ROTATE: When rotate event is not found in the relay log
@retval ERROR: On error
*/
static enum_read_rotate_from_relay_log_status read_rotate_from_relay_log(
char *filename, char *source_log_file, my_off_t *master_log_pos) {
DBUG_TRACE;
Relaylog_file_reader relaylog_file_reader(opt_replica_sql_verify_checksum);
if (relaylog_file_reader.open(filename)) {
LogErr(ERROR_LEVEL, ER_RPL_RECOVERY_ERROR,
relaylog_file_reader.get_error_str());
return ERROR;
}
Log_event *ev = nullptr;
bool done = false;
enum_read_rotate_from_relay_log_status ret = NOT_FOUND_ROTATE;
while (!done && (ev = relaylog_file_reader.read_event_object()) != nullptr) {
DBUG_PRINT("info", ("Read event of type %s", ev->get_type_str()));
switch (ev->get_type_code()) {
case mysql::binlog::event::FORMAT_DESCRIPTION_EVENT:
break;
case mysql::binlog::event::ROTATE_EVENT:
/*
Check for rotate event from the master. Ignore the ROTATE event if it
is a fake rotate event with server_id=0.
*/
if (ev->server_id && ev->server_id != ::server_id) {
Rotate_log_event *rotate_ev = (Rotate_log_event *)ev;
assert(FN_REFLEN >= rotate_ev->ident_len + 1);
memcpy(source_log_file, rotate_ev->new_log_ident,
rotate_ev->ident_len + 1);
*master_log_pos = rotate_ev->pos;
ret = FOUND_ROTATE;
done = true;
}
break;
case mysql::binlog::event::PREVIOUS_GTIDS_LOG_EVENT:
case mysql::binlog::event::IGNORABLE_LOG_EVENT:
case mysql::binlog::event::STOP_EVENT:
break;