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MXS-2384 Update servers concurrently in MariaDB-Monitor

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All servers are now updated in their own threads simultaneously. This
should reduce the possibility of having significantly different gtid:s
shown for different servers.
This commit is contained in:
Esa Korhonen
2019-03-13 19:10:11 +02:00
parent 3ac1b40b63
commit 09ae5d741c
4 changed files with 97 additions and 77 deletions
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71
server/modules/monitor/mariadbmon/mariadbserver.cc
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@ -2177,4 +2177,73 @@ bool MariaDBServer::update_enabled_events()
m_enabled_events = std::move(full_names);
return true;
}
}
/**
* Connect to and query/update a server.
*
* @param server The server to update
*/
void MariaDBServer::update_server(bool time_to_update_disk_space,
const MonitorServer::ConnectionSettings& conn_settings)
{
auto server = this;
MonitorServer* mon_srv = server->m_server_base;
mxs_connect_result_t conn_status = mon_srv->ping_or_connect(conn_settings);
MYSQL* conn = mon_srv->con; // mon_ping_or_connect_to_db() may have reallocated the MYSQL struct.
if (mxs::Monitor::connection_is_ok(conn_status))
{
server->set_status(SERVER_RUNNING);
if (conn_status == MONITOR_CONN_NEWCONN_OK)
{
// Is a new connection or a reconnection. Check server version.
server->update_server_version();
}
if (server->m_capabilities.basic_support
|| server->m_srv_type == MariaDBServer::server_type::BINLOG_ROUTER)
{
// Check permissions if permissions failed last time or if this is a new connection.
if (server->had_status(SERVER_AUTH_ERROR) || conn_status == MONITOR_CONN_NEWCONN_OK)
{
server->check_permissions();
}
// If permissions are ok, continue.
if (!server->has_status(SERVER_AUTH_ERROR))
{
if (time_to_update_disk_space && mon_srv->can_update_disk_space_status())
{
mon_srv->update_disk_space_status();
}
// Query MariaDBServer specific data
server->monitor_server();
}
}
}
else
{
/* The current server is not running. Clear all but the stale master bit as it is used to detect
* masters that went down but came up. */
server->clear_status(~SERVER_WAS_MASTER);
auto conn_errno = mysql_errno(conn);
if (conn_errno == ER_ACCESS_DENIED_ERROR || conn_errno == ER_ACCESS_DENIED_NO_PASSWORD_ERROR)
{
server->set_status(SERVER_AUTH_ERROR);
}
/* Log connect failure only once, that is, if server was RUNNING or MAINTENANCE during last
* iteration. */
if (server->had_status(SERVER_RUNNING) || server->had_status(SERVER_MAINT))
{
mon_srv->log_connect_error(conn_status);
}
}
/** Increase or reset the error count of the server. */
bool is_running = server->is_running();
bool in_maintenance = server->is_in_maintenance();
mon_srv->mon_err_count = (is_running || in_maintenance) ? 0 : mon_srv->mon_err_count + 1;
}