174db469f3
Renamed the two gtid-classes to better match MariaDB documentation. One domain-server-sequence-combination is now a "Gtid", as these identify a transaction. A "GtidList" contains a list of Gtid:s for handling multi-domain server variables composed of multiple comma separated Gtid:s. Removed unused methods and renamed some existing ones. Moved the Gtid-code to its own file.
349 lines
12 KiB
C++
349 lines
12 KiB
C++
/*
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* Copyright (c) 2018 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
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*
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* Change Date: 2020-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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#include "mariadbserver.hh"
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#include <inttypes.h>
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#include <sstream>
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#include <maxscale/mysql_utils.h>
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#include "utilities.hh"
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SlaveStatusInfo::SlaveStatusInfo()
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: master_server_id(SERVER_ID_UNKNOWN)
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, master_port(0)
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, slave_io_running(false)
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, slave_sql_running(false)
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, read_master_log_pos(0)
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{}
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MariaDBServer::MariaDBServer(MXS_MONITORED_SERVER* monitored_server)
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: server_base(monitored_server)
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, version(MYSQL_SERVER_VERSION_51)
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, server_id(SERVER_ID_UNKNOWN)
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, group(0)
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, read_only(false)
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, slave_configured(false)
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, binlog_relay(false)
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, n_slaves_configured(0)
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, n_slaves_running(0)
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, slave_heartbeats(0)
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, heartbeat_period(0)
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, latest_event(0)
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, gtid_domain_id(-1)
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{}
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int64_t MariaDBServer::relay_log_events()
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{
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/* The events_ahead-call below ignores domains where current_pos is ahead of io_pos. This situation is
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* rare but is possible (I guess?) if the server is replicating a domain from multiple masters
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* and decides to process events from one relay log before getting new events to the other. In
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* any case, such events are obsolete and the server can be considered to have processed such logs. */
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return GtidList::events_ahead(slave_status.gtid_io_pos, gtid_current_pos,
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GtidList::MISSING_DOMAIN_LHS_ADD);
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}
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std::auto_ptr<QueryResult> MariaDBServer::execute_query(const string& query)
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{
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auto conn = server_base->con;
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std::auto_ptr<QueryResult> rval;
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MYSQL_RES *result = NULL;
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if (mxs_mysql_query(conn, query.c_str()) == 0 && (result = mysql_store_result(conn)) != NULL)
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{
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rval = std::auto_ptr<QueryResult>(new QueryResult(result));
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}
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else
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{
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mon_report_query_error(server_base);
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}
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return rval;
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}
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bool MariaDBServer::do_show_slave_status()
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{
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/** Column positions for SHOW SLAVE STATUS */
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const size_t MYSQL55_STATUS_MASTER_LOG_POS = 5;
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const size_t MYSQL55_STATUS_MASTER_LOG_FILE = 6;
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const size_t MYSQL55_STATUS_IO_RUNNING = 10;
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const size_t MYSQL55_STATUS_SQL_RUNNING = 11;
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const size_t MYSQL55_STATUS_MASTER_ID = 39;
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unsigned int columns;
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int i_slave_io_running, i_slave_sql_running, i_read_master_log_pos, i_master_server_id, i_master_log_file;
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int i_last_io_errno, i_last_io_error, i_last_sql_error, i_slave_rec_hbs, i_slave_hb_period;
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int i_master_host, i_master_port, i_using_gtid, i_gtid_io_pos;
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const char *query;
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mysql_server_version server_version = version;
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if (server_version == MYSQL_SERVER_VERSION_100)
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{
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columns = 42;
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query = "SHOW ALL SLAVES STATUS";
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}
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else
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{
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columns = server_version == MYSQL_SERVER_VERSION_55 ? 40 : 38;
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query = "SHOW SLAVE STATUS";
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i_slave_io_running = MYSQL55_STATUS_IO_RUNNING;
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i_slave_sql_running = MYSQL55_STATUS_SQL_RUNNING;
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i_master_log_file = MYSQL55_STATUS_MASTER_LOG_FILE;
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i_read_master_log_pos = MYSQL55_STATUS_MASTER_LOG_POS;
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i_master_server_id = MYSQL55_STATUS_MASTER_ID;
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}
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int64_t master_server_id = SERVER_ID_UNKNOWN;
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int nconfigured = 0;
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int nrunning = 0;
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auto result = execute_query(query);
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if (result.get() == NULL)
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{
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return false;
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}
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else if(result->get_column_count() < columns)
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{
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MXS_ERROR("\"%s\" returned less than the expected amount of columns. "
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"Expected %u columns.", query, columns);
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return false;
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}
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if (server_version == MYSQL_SERVER_VERSION_100)
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{
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i_slave_io_running = result->get_col_index("Slave_IO_Running");
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i_slave_sql_running = result->get_col_index("Slave_SQL_Running");
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i_master_log_file = result->get_col_index("Master_Log_File");
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i_read_master_log_pos = result->get_col_index("Read_Master_Log_Pos");
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i_master_server_id = result->get_col_index("Master_Server_Id");
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i_slave_rec_hbs = result->get_col_index("Slave_received_heartbeats");
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i_slave_hb_period = result->get_col_index("Slave_heartbeat_period");
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i_master_host = result->get_col_index("Master_Host");
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i_master_port = result->get_col_index("Master_Port");
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i_using_gtid = result->get_col_index("Using_Gtid");
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i_gtid_io_pos = result->get_col_index("Gtid_IO_Pos");
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i_last_io_errno = result->get_col_index("Last_IO_Errno");
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i_last_io_error = result->get_col_index("Last_IO_Error");
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i_last_sql_error = result->get_col_index("Last_SQL_Error");
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}
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// TODO: Add other versions here once it's certain the column names are the same. Better yet, save the
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// indexes to object data so they don't need to be updated every query.
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while (result->next_row())
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{
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nconfigured++;
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/* get Slave_IO_Running and Slave_SQL_Running values*/
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slave_status.slave_io_running = (result->get_string(i_slave_io_running) == "Yes");
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slave_status.slave_sql_running = (result->get_string(i_slave_sql_running) == "Yes");
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if (slave_status.slave_io_running && slave_status.slave_sql_running)
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{
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if (nrunning == 0)
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{
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/** Only check binlog name for the first running slave */
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string master_log_file = result->get_string(i_master_log_file);
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uint64_t read_master_log_pos = result->get_uint(i_read_master_log_pos);
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if (slave_status.master_log_file != master_log_file ||
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slave_status.read_master_log_pos != read_master_log_pos)
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{
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// IO thread is reading events from the master
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latest_event = time(NULL);
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}
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slave_status.master_log_file = master_log_file;
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slave_status.read_master_log_pos = read_master_log_pos;
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}
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nrunning++;
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}
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/* If Slave_IO_Running = Yes, assign the master_id to current server: this allows building
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* the replication tree, slaves ids will be added to master(s) and we will have at least the
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* root master server.
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* Please note, there could be no slaves at all if Slave_SQL_Running == 'No'
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*/
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int64_t last_io_errno = result->get_uint(i_last_io_errno);
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int io_errno = last_io_errno;
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const int connection_errno = 2003;
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if ((io_errno == 0 || io_errno == connection_errno) &&
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server_version != MYSQL_SERVER_VERSION_51)
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{
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/* Get Master_Server_Id */
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master_server_id = scan_server_id(result->get_string(i_master_server_id).c_str());
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}
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if (server_version == MYSQL_SERVER_VERSION_100)
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{
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slave_status.master_host = result->get_string(i_master_host);
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slave_status.master_port = result->get_uint(i_master_port);
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string last_io_error = result->get_string(i_last_io_error);
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string last_sql_error = result->get_string(i_last_sql_error);
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slave_status.last_error = !last_io_error.empty() ? last_io_error : last_sql_error;
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int heartbeats = result->get_uint(i_slave_rec_hbs);
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if (slave_heartbeats < heartbeats)
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{
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latest_event = time(NULL);
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slave_heartbeats = heartbeats;
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heartbeat_period = result->get_uint(i_slave_hb_period);
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}
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string using_gtid = result->get_string(i_using_gtid);
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string gtid_io_pos = result->get_string(i_gtid_io_pos);
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if (!gtid_io_pos.empty() &&
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(using_gtid == "Current_Pos" || using_gtid == "Slave_Pos"))
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{
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slave_status.gtid_io_pos = GtidList::from_string(gtid_io_pos);
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}
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else
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{
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slave_status.gtid_io_pos = GtidList();
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}
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}
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}
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if (nconfigured > 0)
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{
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slave_configured = true;
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}
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else
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{
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/** Query returned no rows, replication is not configured */
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slave_configured = false;
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slave_heartbeats = 0;
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slave_status = SlaveStatusInfo();
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}
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slave_status.master_server_id = master_server_id;
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n_slaves_configured = nconfigured;
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n_slaves_running = nrunning;
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return true;
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}
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bool MariaDBServer::update_gtids()
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{
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static const string query = "SELECT @@gtid_current_pos, @@gtid_binlog_pos;";
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const int i_current_pos = 0;
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const int i_binlog_pos = 1;
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bool rval = false;
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auto result = execute_query(query);
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if (result.get() != NULL && result->next_row())
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{
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auto current_str = result->get_string(i_current_pos);
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auto binlog_str = result->get_string(i_binlog_pos);
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bool current_ok = false;
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bool binlog_ok = false;
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if (current_str.empty())
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{
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gtid_current_pos = GtidList();
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}
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else
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{
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gtid_current_pos = GtidList::from_string(current_str);
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current_ok = !gtid_current_pos.empty();
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}
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if (binlog_str.empty())
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{
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gtid_binlog_pos = GtidList();
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}
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else
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{
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gtid_binlog_pos = GtidList::from_string(binlog_str);
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binlog_ok = !gtid_binlog_pos.empty();
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}
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rval = (current_ok && binlog_ok);
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}
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return rval;
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}
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bool MariaDBServer::update_replication_settings()
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{
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static const string query = "SELECT @@gtid_strict_mode, @@log_bin, @@log_slave_updates;";
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bool rval = false;
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auto result = execute_query(query);
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if (result.get() != NULL && result->next_row())
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{
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rpl_settings.gtid_strict_mode = result->get_bool(0);
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rpl_settings.log_bin = result->get_bool(1);
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rpl_settings.log_slave_updates = result->get_bool(2);
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rval = true;
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}
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return rval;
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}
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void MariaDBServer::read_server_variables()
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{
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MXS_MONITORED_SERVER* database = server_base;
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string query = "SELECT @@global.server_id, @@read_only;";
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int columns = 2;
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if (version == MYSQL_SERVER_VERSION_100)
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{
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query.erase(query.end() - 1);
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query += ", @@global.gtid_domain_id;";
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columns = 3;
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}
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int i_id = 0;
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int i_ro = 1;
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int i_domain = 2;
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auto result = execute_query(query);
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if (result.get() != NULL && result->next_row())
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{
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int64_t server_id_parsed = result->get_uint(i_id);
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if (server_id_parsed < 0)
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{
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server_id_parsed = SERVER_ID_UNKNOWN;
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}
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database->server->node_id = server_id_parsed;
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server_id = server_id_parsed;
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read_only = result->get_bool(i_ro);
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if (columns == 3)
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{
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gtid_domain_id = result->get_uint(i_domain);
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}
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}
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}
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bool MariaDBServer::check_replication_settings(print_repl_warnings_t print_warnings)
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{
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bool rval = true;
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const char* servername = server_base->server->unique_name;
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if (rpl_settings.log_bin == false)
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{
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if (print_warnings == WARNINGS_ON)
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{
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const char NO_BINLOG[] =
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"Slave '%s' has binary log disabled and is not a valid promotion candidate.";
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MXS_WARNING(NO_BINLOG, servername);
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}
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rval = false;
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}
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else if (print_warnings == WARNINGS_ON)
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{
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if (rpl_settings.gtid_strict_mode == false)
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{
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const char NO_STRICT[] =
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"Slave '%s' has gtid_strict_mode disabled. Enabling this setting is recommended. "
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"For more information, see https://mariadb.com/kb/en/library/gtid/#gtid_strict_mode";
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MXS_WARNING(NO_STRICT, servername);
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}
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if (rpl_settings.log_slave_updates == false)
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{
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const char NO_SLAVE_UPDATES[] =
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"Slave '%s' has log_slave_updates disabled. It is a valid candidate but replication "
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"will break for lagging slaves if '%s' is promoted.";
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MXS_WARNING(NO_SLAVE_UPDATES, servername, servername);
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}
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}
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return rval;
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} |