1141 lines
40 KiB
C++
1141 lines
40 KiB
C++
/*
|
|
* Copyright (c) 2016 MariaDB Corporation Ab
|
|
*
|
|
* Use of this software is governed by the Business Source License included
|
|
* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
|
|
*
|
|
* Change Date: 2020-01-01
|
|
*
|
|
* On the date above, in accordance with the Business Source License, use
|
|
* of this software will be governed by version 2 or later of the General
|
|
* Public License.
|
|
*/
|
|
|
|
/**
|
|
* @file A MariaDB replication cluster monitor
|
|
*/
|
|
#include "mariadbmon.hh"
|
|
#include <inttypes.h>
|
|
#include <sstream>
|
|
#include <maxscale/alloc.h>
|
|
#include <maxscale/dcb.h>
|
|
#include <maxscale/debug.h>
|
|
#include <maxscale/modulecmd.h>
|
|
|
|
#include <maxscale/mysql_utils.h>
|
|
#include <maxscale/secrets.h>
|
|
#include <maxscale/utils.h>
|
|
// TODO: For monitor_add_parameters
|
|
#include "../../../core/internal/monitor.h"
|
|
|
|
using std::string;
|
|
|
|
static void monitorMain(void *);
|
|
|
|
// Config parameter names
|
|
const char * const CN_AUTO_FAILOVER = "auto_failover";
|
|
const char * const CN_PROMOTION_SQL_FILE = "promotion_sql_file";
|
|
const char * const CN_DEMOTION_SQL_FILE = "demotion_sql_file";
|
|
|
|
static const char CN_AUTO_REJOIN[] = "auto_rejoin";
|
|
static const char CN_FAILCOUNT[] = "failcount";
|
|
static const char CN_NO_PROMOTE_SERVERS[] = "servers_no_promotion";
|
|
static const char CN_FAILOVER_TIMEOUT[] = "failover_timeout";
|
|
static const char CN_SWITCHOVER_TIMEOUT[] = "switchover_timeout";
|
|
|
|
// Parameters for master failure verification and timeout
|
|
static const char CN_VERIFY_MASTER_FAILURE[] = "verify_master_failure";
|
|
static const char CN_MASTER_FAILURE_TIMEOUT[] = "master_failure_timeout";
|
|
// Replication credentials parameters for failover/switchover/join
|
|
static const char CN_REPLICATION_USER[] = "replication_user";
|
|
static const char CN_REPLICATION_PASSWORD[] = "replication_password";
|
|
|
|
MariaDBMonitor::MariaDBMonitor(MXS_MONITOR* monitor_base)
|
|
: m_monitor_base(monitor_base)
|
|
, m_id(config_get_global_options()->id)
|
|
, m_master_gtid_domain(GTID_DOMAIN_UNKNOWN)
|
|
, m_external_master_port(PORT_UNKNOWN)
|
|
, m_warn_set_standalone_master(true)
|
|
{}
|
|
|
|
MariaDBMonitor::~MariaDBMonitor()
|
|
{
|
|
clear_server_info();
|
|
}
|
|
|
|
/**
|
|
* Reset and initialize server arrays and related data.
|
|
*/
|
|
void MariaDBMonitor::reset_server_info()
|
|
{
|
|
// If this monitor is being restarted, the server data needs to be freed.
|
|
clear_server_info();
|
|
|
|
// Next, initialize the data.
|
|
for (auto mon_server = m_monitor_base->monitored_servers; mon_server; mon_server = mon_server->next)
|
|
{
|
|
m_servers.push_back(new MariaDBServer(mon_server));
|
|
}
|
|
for (auto iter = m_servers.begin(); iter != m_servers.end(); iter++)
|
|
{
|
|
auto mon_server = (*iter)->m_server_base;
|
|
ss_dassert(m_server_info.count(mon_server) == 0);
|
|
ServerInfoMap::value_type new_val(mon_server, *iter);
|
|
m_server_info.insert(new_val);
|
|
}
|
|
}
|
|
|
|
void MariaDBMonitor::clear_server_info()
|
|
{
|
|
for (auto iter = m_servers.begin(); iter != m_servers.end(); iter++)
|
|
{
|
|
delete *iter;
|
|
}
|
|
// All MariaDBServer*:s are now invalid, as well as any dependant data.
|
|
m_servers.clear();
|
|
m_server_info.clear();
|
|
m_excluded_servers.clear();
|
|
m_master = NULL;
|
|
m_master_gtid_domain = GTID_DOMAIN_UNKNOWN;
|
|
m_external_master_host.clear();
|
|
m_external_master_port = PORT_UNKNOWN;
|
|
}
|
|
|
|
/**
|
|
* Get monitor-specific server info for the monitored server.
|
|
*
|
|
* @param handle
|
|
* @param db Server to get info for. Must be a valid server or function crashes.
|
|
* @return The server info.
|
|
*/
|
|
MariaDBServer* MariaDBMonitor::get_server_info(MXS_MONITORED_SERVER* db)
|
|
{
|
|
ss_dassert(m_server_info.count(db) == 1); // Should always exist in the map
|
|
return m_server_info[db];
|
|
}
|
|
|
|
bool MariaDBMonitor::set_replication_credentials(const MXS_CONFIG_PARAMETER* params)
|
|
{
|
|
bool rval = false;
|
|
string repl_user = config_get_string(params, CN_REPLICATION_USER);
|
|
string repl_pw = config_get_string(params, CN_REPLICATION_PASSWORD);
|
|
|
|
if (repl_user.empty() && repl_pw.empty())
|
|
{
|
|
// No replication credentials defined, use monitor credentials
|
|
repl_user = m_monitor_base->user;
|
|
repl_pw = m_monitor_base->password;
|
|
}
|
|
|
|
if (!repl_user.empty() && !repl_pw.empty())
|
|
{
|
|
m_replication_user = repl_user;
|
|
char* decrypted = decrypt_password(repl_pw.c_str());
|
|
m_replication_password = decrypted;
|
|
MXS_FREE(decrypted);
|
|
rval = true;
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
MariaDBMonitor* MariaDBMonitor::create(MXS_MONITOR *monitor)
|
|
{
|
|
return new MariaDBMonitor(monitor);
|
|
}
|
|
|
|
bool MariaDBMonitor::start(const MXS_CONFIG_PARAMETER* params)
|
|
{
|
|
bool error = false;
|
|
m_keep_running = true;
|
|
/* Reset all monitored state info. The server dependent values must be reset as servers could have been
|
|
* added, removed and modified. */
|
|
reset_server_info();
|
|
|
|
if (!load_config_params(params))
|
|
{
|
|
error = true;
|
|
}
|
|
|
|
if (!error && (thread_start(&m_thread, monitorMain, this, 0) == NULL))
|
|
{
|
|
MXS_ERROR("Failed to start monitor thread for monitor '%s'.", m_monitor_base->name);
|
|
error = true;
|
|
}
|
|
|
|
if (error)
|
|
{
|
|
MXS_ERROR("Failed to start monitor. See earlier errors for more information.");
|
|
}
|
|
|
|
return !error;
|
|
}
|
|
|
|
void MariaDBMonitor::destroy(MariaDBMonitor* monitor)
|
|
{
|
|
delete monitor;
|
|
}
|
|
|
|
/**
|
|
* Load config parameters
|
|
*
|
|
* @param params Config parameters
|
|
* @return True if settings are ok
|
|
*/
|
|
bool MariaDBMonitor::load_config_params(const MXS_CONFIG_PARAMETER* params)
|
|
{
|
|
m_detect_stale_master = config_get_bool(params, "detect_stale_master");
|
|
m_detect_stale_slave = config_get_bool(params, "detect_stale_slave");
|
|
m_detect_replication_lag = config_get_bool(params, "detect_replication_lag");
|
|
m_detect_multimaster = config_get_bool(params, "multimaster");
|
|
m_ignore_external_masters = config_get_bool(params, "ignore_external_masters");
|
|
m_detect_standalone_master = config_get_bool(params, "detect_standalone_master");
|
|
m_failcount = config_get_integer(params, CN_FAILCOUNT);
|
|
m_allow_cluster_recovery = config_get_bool(params, "allow_cluster_recovery");
|
|
m_script = config_get_string(params, "script");
|
|
m_events = config_get_enum(params, "events", mxs_monitor_event_enum_values);
|
|
m_failover_timeout = config_get_integer(params, CN_FAILOVER_TIMEOUT);
|
|
m_switchover_timeout = config_get_integer(params, CN_SWITCHOVER_TIMEOUT);
|
|
m_auto_failover = config_get_bool(params, CN_AUTO_FAILOVER);
|
|
m_auto_rejoin = config_get_bool(params, CN_AUTO_REJOIN);
|
|
m_verify_master_failure = config_get_bool(params, CN_VERIFY_MASTER_FAILURE);
|
|
m_master_failure_timeout = config_get_integer(params, CN_MASTER_FAILURE_TIMEOUT);
|
|
m_promote_sql_file = config_get_string(params, CN_PROMOTION_SQL_FILE);
|
|
m_demote_sql_file = config_get_string(params, CN_DEMOTION_SQL_FILE);
|
|
|
|
m_excluded_servers.clear();
|
|
MXS_MONITORED_SERVER** excluded_array = NULL;
|
|
int n_excluded = mon_config_get_servers(params, CN_NO_PROMOTE_SERVERS, m_monitor_base, &excluded_array);
|
|
for (int i = 0; i < n_excluded; i++)
|
|
{
|
|
m_excluded_servers.push_back(get_server_info(excluded_array[i]));
|
|
}
|
|
MXS_FREE(excluded_array);
|
|
|
|
bool settings_ok = true;
|
|
if (!check_sql_files())
|
|
{
|
|
settings_ok = false;
|
|
}
|
|
if (!set_replication_credentials(params))
|
|
{
|
|
MXS_ERROR("Both '%s' and '%s' must be defined", CN_REPLICATION_USER, CN_REPLICATION_PASSWORD);
|
|
settings_ok = false;
|
|
}
|
|
return settings_ok;
|
|
}
|
|
|
|
/**
|
|
* Stop the monitor.
|
|
*
|
|
* @return True, if the monitor had to be stopped. False, if the monitor already was stopped.
|
|
*/
|
|
bool MariaDBMonitor::stop()
|
|
{
|
|
// There should be no race here as long as admin operations are performed
|
|
// with the single admin lock locked.
|
|
bool actually_stopped = false;
|
|
if (m_status == MXS_MONITOR_RUNNING)
|
|
{
|
|
m_keep_running = false;
|
|
thread_wait(m_thread);
|
|
actually_stopped = true;
|
|
}
|
|
return actually_stopped;
|
|
}
|
|
|
|
void MariaDBMonitor::diagnostics(DCB *dcb) const
|
|
{
|
|
dcb_printf(dcb, "Automatic failover: %s\n", m_auto_failover ? "Enabled" : "Disabled");
|
|
dcb_printf(dcb, "Failcount: %d\n", m_failcount);
|
|
dcb_printf(dcb, "Failover timeout: %u\n", m_failover_timeout);
|
|
dcb_printf(dcb, "Switchover timeout: %u\n", m_switchover_timeout);
|
|
dcb_printf(dcb, "Automatic rejoin: %s\n", m_auto_rejoin ? "Enabled" : "Disabled");
|
|
dcb_printf(dcb, "MaxScale monitor ID: %lu\n", m_id);
|
|
dcb_printf(dcb, "Detect replication lag: %s\n", (m_detect_replication_lag) ? "Enabled" : "Disabled");
|
|
dcb_printf(dcb, "Detect stale master: %s\n", (m_detect_stale_master == 1) ?
|
|
"Enabled" : "Disabled");
|
|
if (m_excluded_servers.size() > 0)
|
|
{
|
|
dcb_printf(dcb, "Non-promotable servers (failover): ");
|
|
dcb_printf(dcb, "%s\n", monitored_servers_to_string(m_excluded_servers).c_str());
|
|
}
|
|
|
|
dcb_printf(dcb, "\nServer information:\n-------------------\n\n");
|
|
for (auto iter = m_servers.begin(); iter != m_servers.end(); iter++)
|
|
{
|
|
string server_info = (*iter)->diagnostics(m_detect_multimaster) + "\n";
|
|
dcb_printf(dcb, "%s", server_info.c_str());
|
|
}
|
|
}
|
|
|
|
json_t* MariaDBMonitor::diagnostics_json() const
|
|
{
|
|
json_t* rval = json_object();
|
|
json_object_set_new(rval, "monitor_id", json_integer(m_id));
|
|
json_object_set_new(rval, "detect_stale_master", json_boolean(m_detect_stale_master));
|
|
json_object_set_new(rval, "detect_stale_slave", json_boolean(m_detect_stale_slave));
|
|
json_object_set_new(rval, "detect_replication_lag", json_boolean(m_detect_replication_lag));
|
|
json_object_set_new(rval, "multimaster", json_boolean(m_detect_multimaster));
|
|
json_object_set_new(rval, "detect_standalone_master", json_boolean(m_detect_standalone_master));
|
|
json_object_set_new(rval, CN_FAILCOUNT, json_integer(m_failcount));
|
|
json_object_set_new(rval, "allow_cluster_recovery", json_boolean(m_allow_cluster_recovery));
|
|
json_object_set_new(rval, CN_AUTO_FAILOVER, json_boolean(m_auto_failover));
|
|
json_object_set_new(rval, CN_FAILOVER_TIMEOUT, json_integer(m_failover_timeout));
|
|
json_object_set_new(rval, CN_SWITCHOVER_TIMEOUT, json_integer(m_switchover_timeout));
|
|
json_object_set_new(rval, CN_AUTO_REJOIN, json_boolean(m_auto_rejoin));
|
|
|
|
if (!m_script.empty())
|
|
{
|
|
json_object_set_new(rval, "script", json_string(m_script.c_str()));
|
|
}
|
|
if (m_excluded_servers.size() > 0)
|
|
{
|
|
string list = monitored_servers_to_string(m_excluded_servers);
|
|
json_object_set_new(rval, CN_NO_PROMOTE_SERVERS, json_string(list.c_str()));
|
|
}
|
|
|
|
if (!m_servers.empty())
|
|
{
|
|
json_t* arr = json_array();
|
|
for (auto iter = m_servers.begin(); iter != m_servers.end(); iter++)
|
|
{
|
|
json_array_append_new(arr, (*iter)->diagnostics_json(m_detect_multimaster));
|
|
}
|
|
json_object_set_new(rval, "server_info", arr);
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
void MariaDBMonitor::main_loop()
|
|
{
|
|
m_status = MXS_MONITOR_RUNNING;
|
|
MariaDBServer* root_master = NULL;
|
|
int log_no_master = 1;
|
|
|
|
if (mysql_thread_init())
|
|
{
|
|
MXS_ERROR("mysql_thread_init failed in monitor module. Exiting.");
|
|
m_status = MXS_MONITOR_STOPPED;
|
|
return;
|
|
}
|
|
|
|
load_journal();
|
|
|
|
if (m_detect_replication_lag)
|
|
{
|
|
check_maxscale_schema_replication();
|
|
}
|
|
|
|
/* Check monitor permissions. Failure won't cause the monitor to stop. Afterwards, close connections so
|
|
* that update_server() reconnects and checks server version. TODO: check permissions when checking
|
|
* server version. */
|
|
check_monitor_permissions(m_monitor_base, "SHOW SLAVE STATUS");
|
|
for (auto iter = m_servers.begin(); iter != m_servers.end(); iter++)
|
|
{
|
|
mysql_close((*iter)->m_server_base->con);
|
|
(*iter)->m_server_base->con = NULL;
|
|
}
|
|
|
|
while (m_keep_running)
|
|
{
|
|
timespec loop_start;
|
|
/* Coarse time has resolution ~1ms (as opposed to 1ns) but this is enough. */
|
|
clock_gettime(CLOCK_MONOTONIC_COARSE, &loop_start);
|
|
|
|
lock_monitor_servers(m_monitor_base);
|
|
servers_status_pending_to_current(m_monitor_base);
|
|
|
|
// Query all servers for their status.
|
|
for (auto iter = m_servers.begin(); iter != m_servers.end(); iter++)
|
|
{
|
|
MariaDBServer* server = *iter;
|
|
server->update_server(m_monitor_base);
|
|
}
|
|
|
|
// Use the information to find the so far best master server.
|
|
root_master = find_root_master();
|
|
|
|
if (m_master != NULL && m_master->is_master())
|
|
{
|
|
// Update cluster-wide values dependant on the current master.
|
|
update_gtid_domain();
|
|
update_external_master();
|
|
}
|
|
|
|
// Assign relay masters, clear SERVER_SLAVE from binlog relays
|
|
for (auto iter = m_servers.begin(); iter != m_servers.end(); iter++)
|
|
{
|
|
assign_relay_master(**iter);
|
|
|
|
/* Remove SLAVE status if this server is a Binlog Server relay */
|
|
if ((*iter)->m_version == MariaDBServer::version::BINLOG_ROUTER)
|
|
{
|
|
monitor_clear_pending_status((*iter)->m_server_base, SERVER_SLAVE);
|
|
}
|
|
}
|
|
|
|
/* Update server status from monitor pending status on that server*/
|
|
for (auto iter = m_servers.begin(); iter != m_servers.end(); iter++)
|
|
{
|
|
update_server_states(**iter, root_master);
|
|
}
|
|
|
|
/** Now that all servers have their status correctly set, we can check
|
|
if we need to use standalone master. */
|
|
if (m_detect_standalone_master)
|
|
{
|
|
if (standalone_master_required())
|
|
{
|
|
// Other servers have died, set last remaining server as master
|
|
if (set_standalone_master())
|
|
{
|
|
// Update the root_master to point to the standalone master
|
|
root_master = m_master;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
m_warn_set_standalone_master = true;
|
|
}
|
|
}
|
|
|
|
if (root_master && root_master->is_master())
|
|
{
|
|
SERVER* root_master_server = root_master->m_server_base->server;
|
|
// Clear slave and stale slave status bits from current master
|
|
server_clear_status_nolock(root_master_server, SERVER_SLAVE | SERVER_STALE_SLAVE);
|
|
monitor_clear_pending_status(root_master->m_server_base, SERVER_SLAVE | SERVER_STALE_SLAVE);
|
|
|
|
/**
|
|
* Clear external slave status from master if configured to do so.
|
|
* This allows parts of a multi-tiered replication setup to be used
|
|
* in MaxScale.
|
|
*/
|
|
if (m_ignore_external_masters)
|
|
{
|
|
monitor_clear_pending_status(root_master->m_server_base, SERVER_SLAVE_OF_EXTERNAL_MASTER);
|
|
server_clear_status_nolock(root_master_server, SERVER_SLAVE_OF_EXTERNAL_MASTER);
|
|
}
|
|
}
|
|
|
|
ss_dassert(root_master == NULL || root_master == m_master);
|
|
ss_dassert(root_master == NULL ||
|
|
((root_master->m_server_base->server->status & (SERVER_SLAVE | SERVER_MASTER)) !=
|
|
(SERVER_SLAVE | SERVER_MASTER)));
|
|
|
|
/**
|
|
* After updating the status of all servers, check if monitor events
|
|
* need to be launched.
|
|
*/
|
|
mon_process_state_changes(m_monitor_base, m_script.c_str(), m_events);
|
|
bool failover_performed = false; // Has an automatic failover been performed (or attempted) this loop?
|
|
|
|
if (m_auto_failover)
|
|
{
|
|
failover_performed = handle_auto_failover();
|
|
}
|
|
|
|
/* log master detection failure of first master becomes available after failure */
|
|
log_master_changes(root_master, &log_no_master);
|
|
|
|
/* Generate the replication heartbeat event by performing an update */
|
|
if (m_detect_replication_lag && root_master &&
|
|
(root_master->is_master() || SERVER_IS_RELAY_SERVER(root_master->m_server_base->server)))
|
|
{
|
|
measure_replication_lag(root_master);
|
|
}
|
|
|
|
// Do not auto-join servers on this monitor loop if a failover (or any other cluster modification)
|
|
// has been performed, as server states have not been updated yet. It will happen next iteration.
|
|
if (!config_get_global_options()->passive && m_auto_rejoin &&
|
|
!failover_performed && cluster_can_be_joined())
|
|
{
|
|
// Check if any servers should be autojoined to the cluster and try to join them.
|
|
handle_auto_rejoin();
|
|
}
|
|
|
|
mon_hangup_failed_servers(m_monitor_base);
|
|
servers_status_current_to_pending(m_monitor_base);
|
|
store_server_journal(m_monitor_base, m_master ? m_master->m_server_base : NULL);
|
|
release_monitor_servers(m_monitor_base);
|
|
|
|
// Check how much the monitor should sleep to get one full monitor interval.
|
|
timespec loop_end;
|
|
clock_gettime(CLOCK_MONOTONIC_COARSE, &loop_end);
|
|
int64_t time_elapsed_ms = (loop_end.tv_sec - loop_start.tv_sec) * 1000 +
|
|
(loop_end.tv_nsec - loop_start.tv_nsec) / 1000000;
|
|
int64_t sleep_time_remaining = m_monitor_base->interval - time_elapsed_ms;
|
|
// Sleep at least one full interval.
|
|
sleep_time_remaining = MXS_MAX(MXS_MON_BASE_INTERVAL_MS, sleep_time_remaining);
|
|
/* Sleep in small increments to react faster to some events. This should ideally use some type of
|
|
* notification mechanism. */
|
|
while (sleep_time_remaining > 0 && m_keep_running && !m_monitor_base->server_pending_changes)
|
|
{
|
|
int small_sleep_ms = (sleep_time_remaining >= MXS_MON_BASE_INTERVAL_MS) ?
|
|
MXS_MON_BASE_INTERVAL_MS : sleep_time_remaining;
|
|
thread_millisleep(small_sleep_ms);
|
|
sleep_time_remaining -= small_sleep_ms;
|
|
}
|
|
}
|
|
|
|
m_status = MXS_MONITOR_STOPPING;
|
|
mysql_thread_end();
|
|
m_status = MXS_MONITOR_STOPPED;
|
|
}
|
|
|
|
void MariaDBMonitor::update_gtid_domain()
|
|
{
|
|
int64_t domain = m_master->m_gtid_domain_id;
|
|
if (m_master_gtid_domain != GTID_DOMAIN_UNKNOWN && domain != m_master_gtid_domain)
|
|
{
|
|
MXS_NOTICE("Gtid domain id of master has changed: %" PRId64 " -> %" PRId64 ".",
|
|
m_master_gtid_domain, domain);
|
|
}
|
|
m_master_gtid_domain = domain;
|
|
}
|
|
|
|
void MariaDBMonitor::update_external_master()
|
|
{
|
|
if (SERVER_IS_SLAVE_OF_EXTERNAL_MASTER(m_master->m_server_base->server))
|
|
{
|
|
ss_dassert(!m_master->m_slave_status.empty());
|
|
if (m_master->m_slave_status[0].master_host != m_external_master_host ||
|
|
m_master->m_slave_status[0].master_port != m_external_master_port)
|
|
{
|
|
const string new_ext_host = m_master->m_slave_status[0].master_host;
|
|
const int new_ext_port = m_master->m_slave_status[0].master_port;
|
|
if (m_external_master_port == PORT_UNKNOWN)
|
|
{
|
|
MXS_NOTICE("Cluster master server is replicating from an external master: %s:%d",
|
|
new_ext_host.c_str(), new_ext_port);
|
|
}
|
|
else
|
|
{
|
|
MXS_NOTICE("The external master of the cluster has changed: %s:%d -> %s:%d.",
|
|
m_external_master_host.c_str(), m_external_master_port,
|
|
new_ext_host.c_str(), new_ext_port);
|
|
}
|
|
m_external_master_host = new_ext_host;
|
|
m_external_master_port = new_ext_port;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (m_external_master_port != PORT_UNKNOWN)
|
|
{
|
|
MXS_NOTICE("Cluster lost the external master.");
|
|
}
|
|
m_external_master_host.clear();
|
|
m_external_master_port = PORT_UNKNOWN;
|
|
}
|
|
}
|
|
|
|
void MariaDBMonitor::measure_replication_lag(MariaDBServer* root_master)
|
|
{
|
|
ss_dassert(root_master);
|
|
MXS_MONITORED_SERVER* mon_root_master = root_master->m_server_base;
|
|
set_master_heartbeat(root_master);
|
|
for (auto iter = m_servers.begin(); iter != m_servers.end(); iter++)
|
|
{
|
|
MariaDBServer* server = *iter;
|
|
MXS_MONITORED_SERVER* ptr = server->m_server_base;
|
|
if ((!SERVER_IN_MAINT(ptr->server)) && server->is_running())
|
|
{
|
|
if (ptr->server->node_id != mon_root_master->server->node_id &&
|
|
(server->is_slave() || SERVER_IS_RELAY_SERVER(ptr->server)) &&
|
|
(server->m_version == MariaDBServer::version::MARIADB_MYSQL_55 ||
|
|
server->m_version == MariaDBServer::version::MARIADB_100)) // No select lag for Binlog Server
|
|
{
|
|
set_slave_heartbeat(server);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void MariaDBMonitor::log_master_changes(MariaDBServer* root_master_server, int* log_no_master)
|
|
{
|
|
MXS_MONITORED_SERVER* root_master = root_master_server ? root_master_server->m_server_base : NULL;
|
|
if (root_master &&
|
|
mon_status_changed(root_master) &&
|
|
!(root_master->server->status & SERVER_STALE_STATUS))
|
|
{
|
|
if (root_master->pending_status & (SERVER_MASTER) && SERVER_IS_RUNNING(root_master->server))
|
|
{
|
|
if (!(root_master->mon_prev_status & SERVER_STALE_STATUS) &&
|
|
!(root_master->server->status & SERVER_MAINT))
|
|
{
|
|
MXS_NOTICE("A Master Server is now available: %s:%i",
|
|
root_master->server->address,
|
|
root_master->server->port);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("No Master can be determined. Last known was %s:%i",
|
|
root_master->server->address,
|
|
root_master->server->port);
|
|
}
|
|
*log_no_master = 1;
|
|
}
|
|
else
|
|
{
|
|
if (!root_master && *log_no_master)
|
|
{
|
|
MXS_ERROR("No Master can be determined");
|
|
*log_no_master = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
void MariaDBMonitor::handle_auto_rejoin()
|
|
{
|
|
ServerArray joinable_servers;
|
|
if (get_joinable_servers(&joinable_servers))
|
|
{
|
|
uint32_t joins = do_rejoin(joinable_servers, NULL);
|
|
if (joins > 0)
|
|
{
|
|
MXS_NOTICE("%d server(s) redirected or rejoined the cluster.", joins);
|
|
}
|
|
if (joins < joinable_servers.size())
|
|
{
|
|
MXS_ERROR("A cluster join operation failed, disabling automatic rejoining. "
|
|
"To re-enable, manually set '%s' to 'true' for monitor '%s' via MaxAdmin or "
|
|
"the REST API.", CN_AUTO_REJOIN, m_monitor_base->name);
|
|
m_auto_rejoin = false;
|
|
disable_setting(CN_AUTO_REJOIN);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Query error to master '%s' prevented a possible rejoin operation.", m_master->name());
|
|
}
|
|
}
|
|
|
|
/**
|
|
* The entry point for the monitoring module thread
|
|
*
|
|
* @param arg The handle of the monitor. Must be the object returned by startMonitor.
|
|
*/
|
|
static void monitorMain(void *arg)
|
|
{
|
|
MariaDBMonitor* handle = static_cast<MariaDBMonitor*>(arg);
|
|
handle->main_loop();
|
|
}
|
|
|
|
/**
|
|
* Simple wrapper for mxs_mysql_query and mysql_num_rows
|
|
*
|
|
* @param database Database connection
|
|
* @param query Query to execute
|
|
*
|
|
* @return Number of rows or -1 on error
|
|
*/
|
|
static int get_row_count(MXS_MONITORED_SERVER *database, const char* query)
|
|
{
|
|
int returned_rows = -1;
|
|
|
|
if (mxs_mysql_query(database->con, query) == 0)
|
|
{
|
|
MYSQL_RES* result = mysql_store_result(database->con);
|
|
|
|
if (result)
|
|
{
|
|
returned_rows = mysql_num_rows(result);
|
|
mysql_free_result(result);
|
|
}
|
|
}
|
|
|
|
return returned_rows;
|
|
}
|
|
|
|
/**
|
|
* Write the replication heartbeat into the maxscale_schema.replication_heartbeat table in the current master.
|
|
* The inserted value will be seen from all slaves replicating from this master.
|
|
*
|
|
* @param server The server to write the heartbeat to
|
|
*/
|
|
void MariaDBMonitor::set_master_heartbeat(MariaDBServer* server)
|
|
{
|
|
time_t heartbeat;
|
|
time_t purge_time;
|
|
char heartbeat_insert_query[512] = "";
|
|
char heartbeat_purge_query[512] = "";
|
|
|
|
if (m_master == NULL)
|
|
{
|
|
MXS_ERROR("set_master_heartbeat called without an available Master server");
|
|
return;
|
|
}
|
|
|
|
MXS_MONITORED_SERVER* database = server->m_server_base;
|
|
int n_db = get_row_count(database, "SELECT schema_name FROM information_schema.schemata "
|
|
"WHERE schema_name = 'maxscale_schema'");
|
|
int n_tbl = get_row_count(database, "SELECT table_name FROM information_schema.tables "
|
|
"WHERE table_schema = 'maxscale_schema' "
|
|
"AND table_name = 'replication_heartbeat'");
|
|
|
|
if (n_db == -1 || n_tbl == -1 ||
|
|
(n_db == 0 && mxs_mysql_query(database->con, "CREATE DATABASE maxscale_schema")) ||
|
|
(n_tbl == 0 && mxs_mysql_query(database->con, "CREATE TABLE IF NOT EXISTS "
|
|
"maxscale_schema.replication_heartbeat "
|
|
"(maxscale_id INT NOT NULL, "
|
|
"master_server_id INT NOT NULL, "
|
|
"master_timestamp INT UNSIGNED NOT NULL, "
|
|
"PRIMARY KEY ( master_server_id, maxscale_id ) )")))
|
|
{
|
|
MXS_ERROR("Error creating maxscale_schema.replication_heartbeat "
|
|
"table in Master server: %s", mysql_error(database->con));
|
|
database->server->rlag = MAX_RLAG_NOT_AVAILABLE;
|
|
return;
|
|
}
|
|
|
|
/* auto purge old values after 48 hours*/
|
|
purge_time = time(0) - (3600 * 48);
|
|
|
|
sprintf(heartbeat_purge_query,
|
|
"DELETE FROM maxscale_schema.replication_heartbeat WHERE master_timestamp < %lu", purge_time);
|
|
|
|
if (mxs_mysql_query(database->con, heartbeat_purge_query))
|
|
{
|
|
MXS_ERROR("Error deleting from maxscale_schema.replication_heartbeat "
|
|
"table: [%s], %s",
|
|
heartbeat_purge_query,
|
|
mysql_error(database->con));
|
|
}
|
|
|
|
heartbeat = time(0);
|
|
|
|
/* set node_ts for master as time(0) */
|
|
database->server->node_ts = heartbeat;
|
|
|
|
sprintf(heartbeat_insert_query,
|
|
"UPDATE maxscale_schema.replication_heartbeat "
|
|
"SET master_timestamp = %lu WHERE master_server_id = %li AND maxscale_id = %lu",
|
|
heartbeat, m_master->m_server_base->server->node_id, m_id);
|
|
|
|
/* Try to insert MaxScale timestamp into master */
|
|
if (mxs_mysql_query(database->con, heartbeat_insert_query))
|
|
{
|
|
|
|
database->server->rlag = MAX_RLAG_NOT_AVAILABLE;
|
|
|
|
MXS_ERROR("Error updating maxscale_schema.replication_heartbeat table: [%s], %s",
|
|
heartbeat_insert_query,
|
|
mysql_error(database->con));
|
|
}
|
|
else
|
|
{
|
|
if (mysql_affected_rows(database->con) == 0)
|
|
{
|
|
heartbeat = time(0);
|
|
sprintf(heartbeat_insert_query,
|
|
"REPLACE INTO maxscale_schema.replication_heartbeat "
|
|
"(master_server_id, maxscale_id, master_timestamp ) VALUES ( %li, %lu, %lu)",
|
|
m_master->m_server_base->server->node_id, m_id, heartbeat);
|
|
|
|
if (mxs_mysql_query(database->con, heartbeat_insert_query))
|
|
{
|
|
|
|
database->server->rlag = MAX_RLAG_NOT_AVAILABLE;
|
|
|
|
MXS_ERROR("Error inserting into "
|
|
"maxscale_schema.replication_heartbeat table: [%s], %s",
|
|
heartbeat_insert_query,
|
|
mysql_error(database->con));
|
|
}
|
|
else
|
|
{
|
|
/* Set replication lag to 0 for the master */
|
|
database->server->rlag = 0;
|
|
|
|
MXS_DEBUG("heartbeat table inserted data for %s:%i",
|
|
database->server->address, database->server->port);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Set replication lag as 0 for the master */
|
|
database->server->rlag = 0;
|
|
|
|
MXS_DEBUG("heartbeat table updated for Master %s:%i",
|
|
database->server->address, database->server->port);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This function gets the replication heartbeat from the maxscale_schema.replication_heartbeat table in
|
|
* the current slave and stores the timestamp and replication lag in the slave server struct.
|
|
*
|
|
* @param server The slave to measure lag at
|
|
*/
|
|
void MariaDBMonitor::set_slave_heartbeat(MariaDBServer* server)
|
|
{
|
|
time_t heartbeat;
|
|
char select_heartbeat_query[256] = "";
|
|
MYSQL_ROW row;
|
|
MYSQL_RES *result;
|
|
|
|
if (m_master == NULL)
|
|
{
|
|
MXS_ERROR("set_slave_heartbeat called without an available Master server");
|
|
return;
|
|
}
|
|
|
|
/* Get the master_timestamp value from maxscale_schema.replication_heartbeat table */
|
|
|
|
sprintf(select_heartbeat_query, "SELECT master_timestamp "
|
|
"FROM maxscale_schema.replication_heartbeat "
|
|
"WHERE maxscale_id = %lu AND master_server_id = %li",
|
|
m_id, m_master->m_server_base->server->node_id);
|
|
|
|
MXS_MONITORED_SERVER* database = server->m_server_base;
|
|
/* if there is a master then send the query to the slave with master_id */
|
|
if (m_master != NULL && (mxs_mysql_query(database->con, select_heartbeat_query) == 0
|
|
&& (result = mysql_store_result(database->con)) != NULL))
|
|
{
|
|
int rows_found = 0;
|
|
|
|
while ((row = mysql_fetch_row(result)))
|
|
{
|
|
int rlag = MAX_RLAG_NOT_AVAILABLE;
|
|
time_t slave_read;
|
|
|
|
rows_found = 1;
|
|
|
|
heartbeat = time(0);
|
|
slave_read = strtoul(row[0], NULL, 10);
|
|
|
|
if ((errno == ERANGE && (slave_read == LONG_MAX || slave_read == LONG_MIN)) ||
|
|
(errno != 0 && slave_read == 0))
|
|
{
|
|
slave_read = 0;
|
|
}
|
|
|
|
if (slave_read)
|
|
{
|
|
/* set the replication lag */
|
|
rlag = heartbeat - slave_read;
|
|
}
|
|
|
|
/* set this node_ts as master_timestamp read from replication_heartbeat table */
|
|
database->server->node_ts = slave_read;
|
|
|
|
if (rlag >= 0)
|
|
{
|
|
/* store rlag only if greater than monitor sampling interval */
|
|
database->server->rlag = ((unsigned int)rlag > (m_monitor_base->interval / 1000)) ? rlag : 0;
|
|
}
|
|
else
|
|
{
|
|
database->server->rlag = MAX_RLAG_NOT_AVAILABLE;
|
|
}
|
|
|
|
MXS_DEBUG("Slave %s:%i has %i seconds lag",
|
|
database->server->address,
|
|
database->server->port,
|
|
database->server->rlag);
|
|
}
|
|
if (!rows_found)
|
|
{
|
|
database->server->rlag = MAX_RLAG_NOT_AVAILABLE;
|
|
database->server->node_ts = 0;
|
|
}
|
|
|
|
mysql_free_result(result);
|
|
}
|
|
else
|
|
{
|
|
database->server->rlag = MAX_RLAG_NOT_AVAILABLE;
|
|
database->server->node_ts = 0;
|
|
|
|
if (m_master->m_server_base->server->node_id < 0)
|
|
{
|
|
MXS_ERROR("error: replication heartbeat: "
|
|
"master_server_id NOT available for %s:%i",
|
|
database->server->address,
|
|
database->server->port);
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("error: replication heartbeat: "
|
|
"failed selecting from hearthbeat table of %s:%i : [%s], %s",
|
|
database->server->address,
|
|
database->server->port,
|
|
select_heartbeat_query,
|
|
mysql_error(database->con));
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Set a monitor config parameter to "false". The effect persists over stopMonitor/startMonitor but not
|
|
* MaxScale restart. Only use on boolean config settings.
|
|
*
|
|
* @param setting_name Setting to disable
|
|
*/
|
|
void MariaDBMonitor::disable_setting(const char* setting)
|
|
{
|
|
MXS_CONFIG_PARAMETER p = {};
|
|
p.name = const_cast<char*>(setting);
|
|
p.value = const_cast<char*>("false");
|
|
monitor_add_parameters(m_monitor_base, &p);
|
|
}
|
|
|
|
/**
|
|
* Loads saved server states. Should only be called once at the beginning of the main loop after server
|
|
* creation.
|
|
*/
|
|
void MariaDBMonitor::load_journal()
|
|
{
|
|
MXS_MONITORED_SERVER* master_output = NULL;
|
|
load_server_journal(m_monitor_base, &master_output);
|
|
m_master = master_output ? get_server_info(master_output) : NULL;
|
|
}
|
|
|
|
/**
|
|
* Check sql text file parameters. A parameter should either be empty or a valid file which can be opened.
|
|
*
|
|
* @return True if no errors occurred when opening the files
|
|
*/
|
|
bool MariaDBMonitor::check_sql_files()
|
|
{
|
|
const char ERRMSG[] = "%s ('%s') does not exist or cannot be accessed for reading: '%s'.";
|
|
|
|
bool rval = true;
|
|
if (!m_promote_sql_file.empty() && access(m_promote_sql_file.c_str(), R_OK) != 0)
|
|
{
|
|
rval = false;
|
|
MXS_ERROR(ERRMSG, CN_PROMOTION_SQL_FILE, m_promote_sql_file.c_str(), mxs_strerror(errno));
|
|
}
|
|
|
|
if (!m_demote_sql_file.empty() && access(m_demote_sql_file.c_str(), R_OK) != 0)
|
|
{
|
|
rval = false;
|
|
MXS_ERROR(ERRMSG, CN_DEMOTION_SQL_FILE, m_demote_sql_file.c_str(), mxs_strerror(errno));
|
|
}
|
|
return rval;
|
|
}
|
|
|
|
/**
|
|
* Command handler for 'switchover'
|
|
*
|
|
* @param args The provided arguments.
|
|
* @param output Pointer where to place output object.
|
|
*
|
|
* @return True, if the command was executed, false otherwise.
|
|
*/
|
|
bool handle_manual_switchover(const MODULECMD_ARG* args, json_t** error_out)
|
|
{
|
|
ss_dassert((args->argc >= 1) && (args->argc <= 3));
|
|
ss_dassert(MODULECMD_GET_TYPE(&args->argv[0].type) == MODULECMD_ARG_MONITOR);
|
|
ss_dassert((args->argc < 2) || (MODULECMD_GET_TYPE(&args->argv[1].type) == MODULECMD_ARG_SERVER));
|
|
ss_dassert((args->argc < 3) || (MODULECMD_GET_TYPE(&args->argv[2].type) == MODULECMD_ARG_SERVER));
|
|
|
|
bool rval = false;
|
|
if (config_get_global_options()->passive)
|
|
{
|
|
const char* const MSG = "Switchover requested but not performed, as MaxScale is in passive mode.";
|
|
PRINT_MXS_JSON_ERROR(error_out, MSG);
|
|
}
|
|
else
|
|
{
|
|
MXS_MONITOR* mon = args->argv[0].value.monitor;
|
|
auto handle = static_cast<MariaDBMonitor*>(mon->instance);
|
|
SERVER* new_master = (args->argc >= 2) ? args->argv[1].value.server : NULL;
|
|
SERVER* current_master = (args->argc == 3) ? args->argv[2].value.server : NULL;
|
|
rval = handle->manual_switchover(new_master, current_master, error_out);
|
|
}
|
|
return rval;
|
|
}
|
|
|
|
/**
|
|
* Command handler for 'failover'
|
|
*
|
|
* @param args Arguments given by user
|
|
* @param output Json error output
|
|
* @return True on success
|
|
*/
|
|
bool handle_manual_failover(const MODULECMD_ARG* args, json_t** output)
|
|
{
|
|
ss_dassert(args->argc == 1);
|
|
ss_dassert(MODULECMD_GET_TYPE(&args->argv[0].type) == MODULECMD_ARG_MONITOR);
|
|
bool rv = false;
|
|
|
|
if (config_get_global_options()->passive)
|
|
{
|
|
PRINT_MXS_JSON_ERROR(output, "Failover requested but not performed, as MaxScale is in passive mode.");
|
|
}
|
|
else
|
|
{
|
|
MXS_MONITOR* mon = args->argv[0].value.monitor;
|
|
auto handle = static_cast<MariaDBMonitor*>(mon->instance);
|
|
rv = handle->manual_failover(output);
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* Command handler for 'rejoin'
|
|
*
|
|
* @param args Arguments given by user
|
|
* @param output Json error output
|
|
* @return True on success
|
|
*/
|
|
bool handle_manual_rejoin(const MODULECMD_ARG* args, json_t** output)
|
|
{
|
|
ss_dassert(args->argc == 2);
|
|
ss_dassert(MODULECMD_GET_TYPE(&args->argv[0].type) == MODULECMD_ARG_MONITOR);
|
|
ss_dassert(MODULECMD_GET_TYPE(&args->argv[1].type) == MODULECMD_ARG_SERVER);
|
|
|
|
bool rv = false;
|
|
if (config_get_global_options()->passive)
|
|
{
|
|
PRINT_MXS_JSON_ERROR(output, "Rejoin requested but not performed, as MaxScale is in passive mode.");
|
|
}
|
|
else
|
|
{
|
|
MXS_MONITOR* mon = args->argv[0].value.monitor;
|
|
SERVER* server = args->argv[1].value.server;
|
|
auto handle = static_cast<MariaDBMonitor*>(mon->instance);
|
|
rv = handle->manual_rejoin(server, output);
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
string monitored_servers_to_string(const ServerArray& servers)
|
|
{
|
|
string rval;
|
|
size_t array_size = servers.size();
|
|
if (array_size > 0)
|
|
{
|
|
const char* separator = "";
|
|
for (size_t i = 0; i < array_size; i++)
|
|
{
|
|
rval += separator;
|
|
rval += servers[i]->name();
|
|
separator = ",";
|
|
}
|
|
}
|
|
return rval;
|
|
}
|
|
|
|
string get_connection_errors(const ServerArray& servers)
|
|
{
|
|
// Get errors from all connections, form a string.
|
|
string rval;
|
|
string separator;
|
|
for (auto iter = servers.begin(); iter != servers.end(); iter++)
|
|
{
|
|
const char* error = mysql_error((*iter)->m_server_base->con);
|
|
ss_dassert(*error); // Every connection should have an error.
|
|
rval += separator + (*iter)->name() + ": '" + error + "'";
|
|
separator = ", ";
|
|
}
|
|
return rval;
|
|
}
|
|
|
|
/**
|
|
* The module entry point routine. This routine populates the module object structure.
|
|
*
|
|
* @return The module object
|
|
*/
|
|
extern "C" MXS_MODULE* MXS_CREATE_MODULE()
|
|
{
|
|
MXS_NOTICE("Initialise the MariaDB Monitor module.");
|
|
static const char ARG_MONITOR_DESC[] = "Monitor name (from configuration file)";
|
|
static modulecmd_arg_type_t switchover_argv[] =
|
|
{
|
|
{
|
|
MODULECMD_ARG_MONITOR | MODULECMD_ARG_NAME_MATCHES_DOMAIN,
|
|
ARG_MONITOR_DESC
|
|
},
|
|
{ MODULECMD_ARG_SERVER | MODULECMD_ARG_OPTIONAL, "New master (optional)" },
|
|
{ MODULECMD_ARG_SERVER | MODULECMD_ARG_OPTIONAL, "Current master (optional)" }
|
|
};
|
|
|
|
modulecmd_register_command(MXS_MODULE_NAME, "switchover", MODULECMD_TYPE_ACTIVE,
|
|
handle_manual_switchover, MXS_ARRAY_NELEMS(switchover_argv),
|
|
switchover_argv, "Perform master switchover");
|
|
|
|
static modulecmd_arg_type_t failover_argv[] =
|
|
{
|
|
{
|
|
MODULECMD_ARG_MONITOR | MODULECMD_ARG_NAME_MATCHES_DOMAIN,
|
|
ARG_MONITOR_DESC
|
|
},
|
|
};
|
|
|
|
modulecmd_register_command(MXS_MODULE_NAME, "failover", MODULECMD_TYPE_ACTIVE,
|
|
handle_manual_failover, MXS_ARRAY_NELEMS(failover_argv),
|
|
failover_argv, "Perform master failover");
|
|
|
|
static modulecmd_arg_type_t rejoin_argv[] =
|
|
{
|
|
{
|
|
MODULECMD_ARG_MONITOR | MODULECMD_ARG_NAME_MATCHES_DOMAIN,
|
|
ARG_MONITOR_DESC
|
|
},
|
|
{ MODULECMD_ARG_SERVER, "Joining server" }
|
|
};
|
|
|
|
modulecmd_register_command(MXS_MODULE_NAME, "rejoin", MODULECMD_TYPE_ACTIVE,
|
|
handle_manual_rejoin, MXS_ARRAY_NELEMS(rejoin_argv),
|
|
rejoin_argv, "Rejoin server to a cluster");
|
|
|
|
static MXS_MODULE info =
|
|
{
|
|
MXS_MODULE_API_MONITOR,
|
|
MXS_MODULE_GA,
|
|
MXS_MONITOR_VERSION,
|
|
"A MariaDB Master/Slave replication monitor",
|
|
"V1.5.0",
|
|
MXS_NO_MODULE_CAPABILITIES,
|
|
&maxscale::MonitorApi<MariaDBMonitor>::s_api,
|
|
NULL, /* Process init. */
|
|
NULL, /* Process finish. */
|
|
NULL, /* Thread init. */
|
|
NULL, /* Thread finish. */
|
|
{
|
|
{"detect_replication_lag", MXS_MODULE_PARAM_BOOL, "false"},
|
|
{"detect_stale_master", MXS_MODULE_PARAM_BOOL, "true"},
|
|
{"detect_stale_slave", MXS_MODULE_PARAM_BOOL, "true"},
|
|
{"mysql51_replication", MXS_MODULE_PARAM_BOOL, "false", MXS_MODULE_OPT_DEPRECATED},
|
|
{"multimaster", MXS_MODULE_PARAM_BOOL, "false"},
|
|
{"detect_standalone_master", MXS_MODULE_PARAM_BOOL, "true"},
|
|
{CN_FAILCOUNT, MXS_MODULE_PARAM_COUNT, "5"},
|
|
{"allow_cluster_recovery", MXS_MODULE_PARAM_BOOL, "true"},
|
|
{"ignore_external_masters", MXS_MODULE_PARAM_BOOL, "false"},
|
|
{
|
|
"script",
|
|
MXS_MODULE_PARAM_PATH,
|
|
NULL,
|
|
MXS_MODULE_OPT_PATH_X_OK
|
|
},
|
|
{
|
|
"events",
|
|
MXS_MODULE_PARAM_ENUM,
|
|
MXS_MONITOR_EVENT_DEFAULT_VALUE,
|
|
MXS_MODULE_OPT_NONE,
|
|
mxs_monitor_event_enum_values
|
|
},
|
|
{CN_AUTO_FAILOVER, MXS_MODULE_PARAM_BOOL, "false"},
|
|
{CN_FAILOVER_TIMEOUT, MXS_MODULE_PARAM_COUNT, "90"},
|
|
{CN_SWITCHOVER_TIMEOUT, MXS_MODULE_PARAM_COUNT, "90"},
|
|
{CN_REPLICATION_USER, MXS_MODULE_PARAM_STRING},
|
|
{CN_REPLICATION_PASSWORD, MXS_MODULE_PARAM_STRING},
|
|
{CN_VERIFY_MASTER_FAILURE, MXS_MODULE_PARAM_BOOL, "true"},
|
|
{CN_MASTER_FAILURE_TIMEOUT, MXS_MODULE_PARAM_COUNT, "10"},
|
|
{CN_AUTO_REJOIN, MXS_MODULE_PARAM_BOOL, "false"},
|
|
{CN_NO_PROMOTE_SERVERS, MXS_MODULE_PARAM_SERVERLIST},
|
|
{CN_PROMOTION_SQL_FILE, MXS_MODULE_PARAM_PATH},
|
|
{CN_DEMOTION_SQL_FILE, MXS_MODULE_PARAM_PATH},
|
|
{MXS_END_MODULE_PARAMS}
|
|
}
|
|
};
|
|
return &info;
|
|
}
|