2320 lines
84 KiB
C++
2320 lines
84 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: 2023-11-05
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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 <fstream>
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#include <inttypes.h>
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#include <iomanip>
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#include <thread>
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#include <set>
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#include <maxbase/format.hh>
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#include <maxsql/mariadb.hh>
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#include <maxscale/mysql_utils.hh>
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using std::string;
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using maxbase::string_printf;
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using maxbase::Duration;
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using maxbase::StopWatch;
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using maxsql::QueryResult;
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using Guard = std::lock_guard<std::mutex>;
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using maxscale::MonitorServer;
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using ConnectResult = maxscale::MonitorServer::ConnectResult;
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MariaDBServer::MariaDBServer(MonitorServer* monitored_server, int config_index,
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const SharedSettings& settings)
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: m_server_base(monitored_server)
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, m_config_index(config_index)
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, m_settings(settings)
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{
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mxb_assert(monitored_server);
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}
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NodeData::NodeData()
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: index(INDEX_NOT_VISITED)
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, lowest_index(INDEX_NOT_VISITED)
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, in_stack(false)
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, cycle(CYCLE_NONE)
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, reach(REACH_UNKNOWN)
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{
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}
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void NodeData::reset_results()
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{
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cycle = CYCLE_NONE;
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parents.clear();
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children.clear();
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external_masters.clear();
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}
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void NodeData::reset_indexes()
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{
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index = INDEX_NOT_VISITED;
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lowest_index = INDEX_NOT_VISITED;
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in_stack = false;
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}
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uint64_t MariaDBServer::relay_log_events(const SlaveStatus& slave_conn)
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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 slave_conn.gtid_io_pos.events_ahead(m_gtid_current_pos, GtidList::MISSING_DOMAIN_IGNORE);
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}
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std::unique_ptr<QueryResult> MariaDBServer::execute_query(const string& query, string* errmsg_out,
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unsigned int* errno_out)
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{
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return maxscale::execute_query(m_server_base->con, query, errmsg_out, errno_out);
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}
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/**
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* Execute a query which does not return data. If the query returns data, an error is returned.
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*
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* @param cmd The query
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* @param mode Retry a failed query using the global query retry settings or not
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* @param errmsg_out Error output.
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* @return True on success, false on error or if query returned data
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*/
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bool MariaDBServer::execute_cmd_ex(const string& cmd, QueryRetryMode mode,
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std::string* errmsg_out, unsigned int* errno_out)
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{
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auto conn = m_server_base->con;
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bool query_success = false;
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if (mode == QueryRetryMode::ENABLED)
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{
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query_success = (mxs_mysql_query(conn, cmd.c_str()) == 0);
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}
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else
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{
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query_success = (maxsql::mysql_query_ex(conn, cmd, 0, 0) == 0);
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}
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bool rval = false;
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if (query_success)
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{
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MYSQL_RES* result = mysql_store_result(conn);
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if (result == NULL)
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{
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rval = true;
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}
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else if (errmsg_out)
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{
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int cols = mysql_num_fields(result);
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int rows = mysql_num_rows(result);
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*errmsg_out = string_printf("Query '%s' on '%s' returned %d columns and %d rows of data when "
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"none was expected.", cmd.c_str(), name(), cols, rows);
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}
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}
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else
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{
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if (errmsg_out)
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{
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*errmsg_out = string_printf("Query '%s' failed on '%s': '%s' (%i).",
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cmd.c_str(), name(), mysql_error(conn), mysql_errno(conn));
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}
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if (errno_out)
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{
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*errno_out = mysql_errno(conn);
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}
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}
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return rval;
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}
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bool MariaDBServer::execute_cmd(const std::string& cmd, std::string* errmsg_out)
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{
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return execute_cmd_ex(cmd, QueryRetryMode::ENABLED, errmsg_out);
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}
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bool MariaDBServer::execute_cmd_no_retry(const std::string& cmd,
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std::string* errmsg_out, unsigned int* errno_out)
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{
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return execute_cmd_ex(cmd, QueryRetryMode::DISABLED, errmsg_out, errno_out);
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}
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/**
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* Execute a query which does not return data. If the query fails because of a network error
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* (e.g. Connector-C timeout), automatically retry the query until time is up. Uses max_statement_time
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* when available to ensure no lingering timed out commands are left on the server.
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*
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* @param cmd The query to execute. Should be a query with a predictable effect even when retried or
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* ran several times.
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* @param time_limit How long to retry. This does not overwrite the connector-c timeouts which are always
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* respected.
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* @param errmsg_out Error output
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* @return True, if successful.
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*/
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bool MariaDBServer::execute_cmd_time_limit(const std::string& cmd, maxbase::Duration time_limit,
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std::string* errmsg_out)
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{
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StopWatch timer;
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string max_stmt_time;
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int connector_timeout = -1;
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if (m_capabilities.max_statement_time)
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{
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MXB_AT_DEBUG(int rv = ) mysql_get_optionv(m_server_base->con, MYSQL_OPT_READ_TIMEOUT,
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&connector_timeout);
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mxb_assert(rv == 0);
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if (connector_timeout > 0)
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{
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max_stmt_time = string_printf("SET STATEMENT max_statement_time=%i FOR ", connector_timeout);
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}
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}
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const string command = max_stmt_time + cmd;
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// If a query lasts less than 1s, sleep so that at most 1 query/s is sent.
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// This prevents busy-looping when faced with some network errors.
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const Duration min_query_time(1.0);
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// Even if time is up, try at least once.
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bool cmd_success = false;
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bool keep_trying = true;
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while (!cmd_success && keep_trying)
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{
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StopWatch query_timer;
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string error_msg;
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unsigned int errornum = 0;
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cmd_success = execute_cmd_no_retry(command, &error_msg, &errornum);
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auto query_time = query_timer.lap();
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// Check if there is time to retry.
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Duration time_remaining = time_limit - timer.split();
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bool non_fatal_connector_err = maxsql::mysql_is_net_error(errornum);
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keep_trying = (time_remaining.secs() > 0)
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// Either a connector-c timeout or query was interrupted by max_statement_time.
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&& (non_fatal_connector_err || (!max_stmt_time.empty() && errornum == ER_STATEMENT_TIMEOUT));
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if (!cmd_success)
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{
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if (keep_trying)
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{
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string retrying = string_printf("Retrying with %.1f seconds left.", time_remaining.secs());
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if (non_fatal_connector_err)
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{
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MXS_WARNING("%s %s", error_msg.c_str(), retrying.c_str());
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}
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else
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{
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// Timed out because of max_statement_time.
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MXS_WARNING("Query '%s' timed out on '%s'. %s",
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command.c_str(), name(), retrying.c_str());
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}
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if (query_time < min_query_time)
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{
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Duration query_sleep = min_query_time - query_time;
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Duration this_sleep = MXS_MIN(time_remaining, query_sleep);
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std::this_thread::sleep_for(this_sleep);
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}
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}
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else if (errmsg_out)
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{
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*errmsg_out = error_msg; // The error string already has all required info.
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}
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}
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}
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return cmd_success;
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}
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bool MariaDBServer::do_show_slave_status(string* errmsg_out)
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{
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unsigned int columns = 0;
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string query;
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bool all_slaves_status = false;
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if (m_srv_type == server_type::CLUSTRIX)
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{
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return false;
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}
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else if (m_capabilities.gtid || m_srv_type == server_type::BINLOG_ROUTER)
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{
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// Versions with gtid also support the extended slave status query.
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columns = 42;
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all_slaves_status = true;
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query = "SHOW ALL SLAVES STATUS;";
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}
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else if (m_capabilities.basic_support)
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{
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columns = 40;
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query = "SHOW SLAVE STATUS;";
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}
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else
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{
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mxb_assert(!true); // This method should not be called for versions < 5.5
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return false;
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}
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auto result = execute_query(query, errmsg_out);
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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_col_count() < columns)
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{
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MXS_ERROR("'%s' returned less than the expected amount of columns. Expected %u columns, "
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"got %" PRId64 ".",
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query.c_str(),
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columns,
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result->get_col_count());
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return false;
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}
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// Fields common to all server versions
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auto i_master_host = result->get_col_index("Master_Host");
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auto i_master_port = result->get_col_index("Master_Port");
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auto i_slave_io_running = result->get_col_index("Slave_IO_Running");
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auto i_slave_sql_running = result->get_col_index("Slave_SQL_Running");
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auto i_master_server_id = result->get_col_index("Master_Server_Id");
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auto i_last_io_errno = result->get_col_index("Last_IO_Errno");
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auto i_last_io_error = result->get_col_index("Last_IO_Error");
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auto i_last_sql_error = result->get_col_index("Last_SQL_Error");
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auto i_seconds_behind_master = result->get_col_index("Seconds_Behind_Master");
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const char INVALID_DATA[] = "'%s' returned invalid data.";
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if (i_master_host < 0 || i_master_port < 0 || i_slave_io_running < 0 || i_slave_sql_running < 0
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|| i_master_server_id < 0 || i_last_io_errno < 0 || i_last_io_error < 0 || i_last_sql_error < 0
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|| i_seconds_behind_master < 0)
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{
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MXS_ERROR(INVALID_DATA, query.c_str());
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return false;
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}
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int64_t i_connection_name = -1, i_slave_rec_hbs = -1, i_slave_hb_period = -1;
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int64_t i_using_gtid = -1, i_gtid_io_pos = -1;
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if (all_slaves_status)
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{
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i_connection_name = result->get_col_index("Connection_name");
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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_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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if (i_connection_name < 0 || i_slave_rec_hbs < 0 || i_slave_hb_period < 0
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|| i_using_gtid < 0 || i_gtid_io_pos < 0)
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{
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MXS_ERROR(INVALID_DATA, query.c_str());
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return false;
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}
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}
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SlaveStatusArray slave_status_new;
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bool parse_error = false;
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while (result->next_row())
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{
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SlaveStatus new_row(name());
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new_row.settings.master_endpoint = EndPoint(result->get_string(i_master_host),
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result->get_int(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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new_row.last_error = !last_io_error.empty() ? last_io_error : last_sql_error;
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new_row.slave_io_running =
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SlaveStatus::slave_io_from_string(result->get_string(i_slave_io_running));
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new_row.slave_sql_running = (result->get_string(i_slave_sql_running) == "Yes");
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new_row.master_server_id = result->get_int(i_master_server_id);
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// If slave connection is stopped, the value given by the backend is null.
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if (result->field_is_null(i_seconds_behind_master))
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{
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new_row.seconds_behind_master = SERVER::RLAG_UNDEFINED;
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}
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else
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{
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// Seconds_Behind_Master is actually uint64, but it will take a long time until it goes over
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// int64 limit.
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new_row.seconds_behind_master = result->get_int(i_seconds_behind_master);
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}
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if (all_slaves_status)
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{
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new_row.settings.name = result->get_string(i_connection_name);
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new_row.received_heartbeats = result->get_int(i_slave_rec_hbs);
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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() && (using_gtid == "Current_Pos" || using_gtid == "Slave_Pos"))
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{
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new_row.gtid_io_pos = GtidList::from_string(gtid_io_pos);
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}
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}
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// If parsing fails, discard all query results.
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if (result->error())
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{
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parse_error = true;
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MXB_ERROR("Query '%s' returned invalid data: %s", query.c_str(), result->error_string().c_str());
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break;
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}
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// Before adding this row to the SlaveStatus array, compare the row to the one from the previous
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// monitor tick and fill in the last pieces of data.
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auto old_row = sstatus_find_previous_row(new_row, slave_status_new.size());
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if (old_row)
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{
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// When the new row was created, 'last_data_time' was set to the current time. If it seems
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// like the slave is not receiving data from the master, set the time to the one
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// in the previous monitor tick.
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if (new_row.received_heartbeats == old_row->received_heartbeats
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&& new_row.gtid_io_pos == old_row->gtid_io_pos)
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{
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new_row.last_data_time = old_row->last_data_time;
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}
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// Copy master server pointer from old row. If this line is not reached because old row does
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// not exist, then the topology rebuild will set the master pointer.
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new_row.master_server = old_row->master_server;
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}
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// Finally, set the connection status.
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if (new_row.slave_io_running == SlaveStatus::SLAVE_IO_YES)
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{
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mxb_assert(new_row.master_server_id > 0);
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new_row.seen_connected = true;
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}
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else if (new_row.slave_io_running == SlaveStatus::SLAVE_IO_CONNECTING && old_row)
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{
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// Old connection data found. Even in this case the server id:s could be wrong if the
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// slave connection was cleared and remade between monitor loops.
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if (new_row.master_server_id == old_row->master_server_id && old_row->seen_connected)
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{
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new_row.seen_connected = true;
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}
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}
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// Row complete, add it to the array.
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slave_status_new.push_back(new_row);
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}
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if (!parse_error)
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{
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// Compare the previous array to the new one.
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if (!sstatus_array_topology_equal(slave_status_new))
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{
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m_topology_changed = true;
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}
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// Always write to m_slave_status. Even if the new status is equal by topology,
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// gtid:s etc may have changed.
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Guard guard(m_arraylock);
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m_slave_status = std::move(slave_status_new);
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}
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return !parse_error;
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}
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bool MariaDBServer::update_gtids(string* errmsg_out)
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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, errmsg_out);
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if (result.get() != NULL)
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{
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Guard guard(m_arraylock);
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rval = true;
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if (result->next_row())
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{
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// Query returned at least some data.
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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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if (current_str.empty())
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{
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m_gtid_current_pos = GtidList();
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}
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else
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{
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m_gtid_current_pos = GtidList::from_string(current_str);
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}
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if (binlog_str.empty())
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{
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m_gtid_binlog_pos = GtidList();
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}
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else
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{
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m_gtid_binlog_pos = GtidList::from_string(binlog_str);
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}
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}
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else
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{
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// Query succeeded but returned 0 rows. This means that the server has no gtid:s.
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m_gtid_current_pos = GtidList();
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m_gtid_binlog_pos = GtidList();
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}
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} // If query failed, do not update gtid:s.
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return rval;
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}
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bool MariaDBServer::update_replication_settings(std::string* errmsg_out)
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{
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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, errmsg_out);
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if (result.get() != NULL && result->next_row())
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{
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rval = true;
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m_rpl_settings.gtid_strict_mode = result->get_bool(0);
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m_rpl_settings.log_bin = result->get_bool(1);
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m_rpl_settings.log_slave_updates = result->get_bool(2);
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}
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return rval;
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}
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|
|
bool MariaDBServer::read_server_variables(string* errmsg_out)
|
|
{
|
|
const string query_no_gtid = "SELECT @@global.server_id, @@read_only;";
|
|
const string query_with_gtid = "SELECT @@global.server_id, @@read_only, @@global.gtid_domain_id;";
|
|
const bool use_gtid = m_capabilities.gtid;
|
|
const string& query = use_gtid ? query_with_gtid : query_no_gtid;
|
|
|
|
int i_id = 0;
|
|
int i_ro = 1;
|
|
int i_domain = 2;
|
|
bool rval = false;
|
|
auto result = execute_query(query, errmsg_out);
|
|
if (result != nullptr)
|
|
{
|
|
if (!result->next_row())
|
|
{
|
|
// This should not really happen, means that server is buggy.
|
|
*errmsg_out = string_printf("Query '%s' did not return any rows.", query.c_str());
|
|
}
|
|
else
|
|
{
|
|
int64_t server_id_parsed = result->get_int(i_id);
|
|
bool read_only_parsed = result->get_bool(i_ro);
|
|
int64_t domain_id_parsed = GTID_DOMAIN_UNKNOWN;
|
|
if (use_gtid)
|
|
{
|
|
domain_id_parsed = result->get_int(i_domain);
|
|
}
|
|
|
|
if (result->error())
|
|
{
|
|
// This is unlikely as well.
|
|
*errmsg_out = string_printf("Query '%s' returned invalid data: %s",
|
|
query.c_str(), result->error_string().c_str());
|
|
}
|
|
else
|
|
{
|
|
// All values parsed and within expected limits.
|
|
rval = true;
|
|
if (server_id_parsed != m_server_id)
|
|
{
|
|
m_server_id = server_id_parsed;
|
|
m_topology_changed = true;
|
|
}
|
|
m_server_base->server->node_id = server_id_parsed;
|
|
|
|
if (read_only_parsed != m_read_only)
|
|
{
|
|
m_read_only = read_only_parsed;
|
|
m_topology_changed = true;
|
|
}
|
|
|
|
m_gtid_domain_id = domain_id_parsed;
|
|
}
|
|
}
|
|
}
|
|
return rval;
|
|
}
|
|
|
|
void MariaDBServer::warn_replication_settings() const
|
|
{
|
|
const char* servername = name();
|
|
if (m_rpl_settings.gtid_strict_mode == false)
|
|
{
|
|
const char NO_STRICT[] =
|
|
"Slave '%s' has gtid_strict_mode disabled. Enabling this setting is recommended. "
|
|
"For more information, see https://mariadb.com/kb/en/library/gtid/#gtid_strict_mode";
|
|
MXS_WARNING(NO_STRICT, servername);
|
|
}
|
|
if (m_rpl_settings.log_slave_updates == false)
|
|
{
|
|
const char NO_SLAVE_UPDATES[] =
|
|
"Slave '%s' has log_slave_updates disabled. It is a valid candidate but replication "
|
|
"will break for lagging slaves if '%s' is promoted.";
|
|
MXS_WARNING(NO_SLAVE_UPDATES, servername, servername);
|
|
}
|
|
}
|
|
|
|
bool MariaDBServer::catchup_to_master(GeneralOpData& op, const GtidList& target)
|
|
{
|
|
/* Prefer to use gtid_binlog_pos, as that is more reliable. But if log_slave_updates is not on,
|
|
* use gtid_current_pos. */
|
|
const bool use_binlog_pos = m_rpl_settings.log_bin && m_rpl_settings.log_slave_updates;
|
|
bool time_is_up = false; // Check at least once.
|
|
bool gtid_reached = false;
|
|
bool error = false;
|
|
json_t** error_out = op.error_out;
|
|
|
|
Duration sleep_time(0.2); // How long to sleep before next iteration. Incremented slowly.
|
|
StopWatch timer;
|
|
|
|
while (!time_is_up && !gtid_reached && !error)
|
|
{
|
|
string error_msg;
|
|
if (update_gtids(&error_msg))
|
|
{
|
|
const GtidList& compare_to = use_binlog_pos ? m_gtid_binlog_pos : m_gtid_current_pos;
|
|
if (target.events_ahead(compare_to, GtidList::MISSING_DOMAIN_IGNORE) == 0)
|
|
{
|
|
gtid_reached = true;
|
|
}
|
|
else
|
|
{
|
|
// Query was successful but target gtid not yet reached. Check how much time left.
|
|
op.time_remaining -= timer.lap();
|
|
if (op.time_remaining.secs() > 0)
|
|
{
|
|
// Sleep for a moment, then try again.
|
|
Duration this_sleep = MXS_MIN(sleep_time, op.time_remaining);
|
|
std::this_thread::sleep_for(this_sleep);
|
|
sleep_time += Duration(0.1); // Sleep a bit more next iteration.
|
|
}
|
|
else
|
|
{
|
|
time_is_up = true;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
error = true;
|
|
PRINT_MXS_JSON_ERROR(error_out, "Failed to update gtid on '%s' while waiting for catchup: %s",
|
|
name(), error_msg.c_str());
|
|
}
|
|
}
|
|
|
|
if (!error && !gtid_reached)
|
|
{
|
|
PRINT_MXS_JSON_ERROR(error_out, "Slave catchup timed out on slave '%s'.", name());
|
|
}
|
|
return gtid_reached;
|
|
}
|
|
|
|
bool MariaDBServer::binlog_on() const
|
|
{
|
|
return m_rpl_settings.log_bin;
|
|
}
|
|
|
|
bool MariaDBServer::is_master() const
|
|
{
|
|
return status_is_master(m_server_base->pending_status);
|
|
}
|
|
|
|
bool MariaDBServer::is_slave() const
|
|
{
|
|
return status_is_slave(m_server_base->pending_status);
|
|
}
|
|
|
|
bool MariaDBServer::is_slave_of_ext_master() const
|
|
{
|
|
return status_is_slave_of_ext_master(m_server_base->pending_status);
|
|
}
|
|
|
|
bool MariaDBServer::is_usable() const
|
|
{
|
|
return status_is_usable(m_server_base->pending_status);
|
|
}
|
|
|
|
bool MariaDBServer::is_running() const
|
|
{
|
|
return status_is_running(m_server_base->pending_status);
|
|
}
|
|
|
|
bool MariaDBServer::is_down() const
|
|
{
|
|
return status_is_down(m_server_base->pending_status);
|
|
}
|
|
|
|
bool MariaDBServer::is_in_maintenance() const
|
|
{
|
|
return status_is_in_maint(m_server_base->pending_status);
|
|
}
|
|
|
|
bool MariaDBServer::is_relay_master() const
|
|
{
|
|
return status_is_relay(m_server_base->pending_status);
|
|
}
|
|
|
|
bool MariaDBServer::is_low_on_disk_space() const
|
|
{
|
|
return status_is_disk_space_exhausted(m_server_base->pending_status);
|
|
}
|
|
|
|
bool MariaDBServer::has_status(uint64_t bits) const
|
|
{
|
|
return (m_server_base->pending_status & bits) == bits;
|
|
}
|
|
|
|
bool MariaDBServer::had_status(uint64_t bits) const
|
|
{
|
|
return (m_server_base->mon_prev_status & bits) == bits;
|
|
}
|
|
|
|
bool MariaDBServer::is_read_only() const
|
|
{
|
|
return m_read_only;
|
|
}
|
|
|
|
const char* MariaDBServer::name() const
|
|
{
|
|
return m_server_base->server->name();
|
|
}
|
|
|
|
string MariaDBServer::diagnostics() const
|
|
{
|
|
// Format strings.
|
|
const char fmt_string[] = "%-23s %s\n";
|
|
const char fmt_int[] = "%-23s %i\n";
|
|
const char fmt_int64[] = "%-23s %" PRIi64 "\n";
|
|
|
|
string rval;
|
|
rval.reserve(300); // Enough for most common ouput.
|
|
|
|
rval += string_printf(fmt_string, "Server:", name());
|
|
rval += string_printf(fmt_int64, "Server ID:", m_server_id);
|
|
rval += string_printf(fmt_string, "Read only:", (m_read_only ? "Yes" : "No"));
|
|
Guard guard(m_arraylock);
|
|
if (!m_gtid_current_pos.empty())
|
|
{
|
|
rval += string_printf(fmt_string, "Gtid current position:", m_gtid_current_pos.to_string().c_str());
|
|
}
|
|
if (!m_gtid_binlog_pos.empty())
|
|
{
|
|
rval += string_printf(fmt_string, "Gtid binlog position:", m_gtid_binlog_pos.to_string().c_str());
|
|
}
|
|
if (m_node.cycle != NodeData::CYCLE_NONE)
|
|
{
|
|
rval += string_printf(fmt_int, "Master group:", m_node.cycle);
|
|
}
|
|
|
|
rval += (m_slave_status.empty() ? "No slave connections\n" : "Slave connections:\n");
|
|
for (const SlaveStatus& sstatus : m_slave_status)
|
|
{
|
|
rval += sstatus.to_string() + "\n";
|
|
}
|
|
return rval;
|
|
}
|
|
|
|
json_t* MariaDBServer::to_json() const
|
|
{
|
|
json_t* result = json_object();
|
|
json_object_set_new(result, "name", json_string(name()));
|
|
json_object_set_new(result, "server_id", json_integer(m_server_id));
|
|
json_object_set_new(result, "read_only", json_boolean(m_read_only));
|
|
|
|
Guard guard(m_arraylock);
|
|
json_object_set_new(result,
|
|
"gtid_current_pos",
|
|
m_gtid_current_pos.empty() ? json_null() :
|
|
json_string(m_gtid_current_pos.to_string().c_str()));
|
|
|
|
json_object_set_new(result,
|
|
"gtid_binlog_pos",
|
|
m_gtid_binlog_pos.empty() ? json_null() :
|
|
json_string(m_gtid_binlog_pos.to_string().c_str()));
|
|
|
|
json_object_set_new(result,
|
|
"master_group",
|
|
(m_node.cycle == NodeData::CYCLE_NONE) ? json_null() : json_integer(m_node.cycle));
|
|
|
|
json_t* slave_connections = json_array();
|
|
for (const auto& sstatus : m_slave_status)
|
|
{
|
|
json_array_append_new(slave_connections, sstatus.to_json());
|
|
}
|
|
json_object_set_new(result, "slave_connections", slave_connections);
|
|
return result;
|
|
}
|
|
|
|
bool MariaDBServer::can_replicate_from(MariaDBServer* master, string* reason_out)
|
|
{
|
|
mxb_assert(reason_out);
|
|
mxb_assert(is_usable()); // The server must be running.
|
|
|
|
bool can_replicate = false;
|
|
if (m_gtid_current_pos.empty())
|
|
{
|
|
*reason_out = string_printf("'%s' does not have a valid gtid_current_pos.", name());
|
|
}
|
|
else if (master->m_gtid_binlog_pos.empty())
|
|
{
|
|
*reason_out = string_printf("'%s' does not have a valid gtid_binlog_pos.", master->name());
|
|
}
|
|
else
|
|
{
|
|
can_replicate = m_gtid_current_pos.can_replicate_from(master->m_gtid_binlog_pos);
|
|
if (!can_replicate)
|
|
{
|
|
*reason_out = string_printf("gtid_current_pos of '%s' (%s) is incompatible with "
|
|
"gtid_binlog_pos of '%s' (%s).",
|
|
name(), m_gtid_current_pos.to_string().c_str(),
|
|
master->name(), master->m_gtid_binlog_pos.to_string().c_str());
|
|
}
|
|
}
|
|
return can_replicate;
|
|
}
|
|
|
|
bool MariaDBServer::run_sql_from_file(const string& path, json_t** error_out)
|
|
{
|
|
MYSQL* conn = m_server_base->con;
|
|
bool error = false;
|
|
std::ifstream sql_file(path);
|
|
if (sql_file.is_open())
|
|
{
|
|
MXS_NOTICE("Executing sql queries from file '%s' on server '%s'.", path.c_str(), name());
|
|
int lines_executed = 0;
|
|
|
|
while (!sql_file.eof() && !error)
|
|
{
|
|
string line;
|
|
std::getline(sql_file, line);
|
|
if (sql_file.bad())
|
|
{
|
|
PRINT_MXS_JSON_ERROR(error_out,
|
|
"Error when reading sql text file '%s': '%s'.",
|
|
path.c_str(),
|
|
mxs_strerror(errno));
|
|
error = true;
|
|
}
|
|
// Skip empty lines and comment lines
|
|
else if (!line.empty() && line[0] != '#')
|
|
{
|
|
if (mxs_mysql_query(conn, line.c_str()) == 0)
|
|
{
|
|
lines_executed++;
|
|
// Discard results if any.
|
|
MYSQL_RES* res = mysql_store_result(conn);
|
|
if (res != NULL)
|
|
{
|
|
mysql_free_result(res);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
PRINT_MXS_JSON_ERROR(error_out,
|
|
"Failed to execute sql from text file '%s'. Query: '%s'. "
|
|
"Error: '%s'.",
|
|
path.c_str(),
|
|
line.c_str(),
|
|
mysql_error(conn));
|
|
error = true;
|
|
}
|
|
}
|
|
}
|
|
MXS_NOTICE("%d queries executed successfully.", lines_executed);
|
|
}
|
|
else
|
|
{
|
|
PRINT_MXS_JSON_ERROR(error_out, "Could not open sql text file '%s'.", path.c_str());
|
|
error = true;
|
|
}
|
|
return !error;
|
|
}
|
|
|
|
void MariaDBServer::monitor_server()
|
|
{
|
|
string errmsg;
|
|
bool query_ok = false;
|
|
/* Query different things depending on server version/type. */
|
|
if (m_srv_type == server_type::BINLOG_ROUTER)
|
|
{
|
|
// TODO: Add special version of server variable query.
|
|
query_ok = update_slave_status(&errmsg);
|
|
}
|
|
else if (m_capabilities.basic_support)
|
|
{
|
|
query_ok = read_server_variables(&errmsg) && update_slave_status(&errmsg);
|
|
if (query_ok && m_capabilities.gtid)
|
|
{
|
|
query_ok = update_gtids(&errmsg);
|
|
}
|
|
if (query_ok && m_settings.handle_event_scheduler)
|
|
{
|
|
query_ok = update_enabled_events();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// Not a binlog server and no normal support, don't update.
|
|
query_ok = true;
|
|
}
|
|
|
|
if (query_ok)
|
|
{
|
|
m_print_update_errormsg = true;
|
|
}
|
|
/* If one of the queries ran to an error, print the error message, assuming it hasn't already been
|
|
* printed. Some really unlikely errors won't produce an error message, but these are visible in other
|
|
* ways. */
|
|
else if (!errmsg.empty() && m_print_update_errormsg)
|
|
{
|
|
MXS_WARNING("Error during monitor update of server '%s': %s", name(), errmsg.c_str());
|
|
m_print_update_errormsg = false;
|
|
}
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* Update slave status of the server.
|
|
*
|
|
* @param errmsg_out Where to store an error message if query fails. Can be null.
|
|
* @return True on success
|
|
*/
|
|
bool MariaDBServer::update_slave_status(string* errmsg_out)
|
|
{
|
|
bool rval = do_show_slave_status(errmsg_out);
|
|
if (rval)
|
|
{
|
|
/** Store master_id of current node. */
|
|
m_server_base->server->master_id = !m_slave_status.empty() ?
|
|
m_slave_status[0].master_server_id : SERVER_ID_UNKNOWN;
|
|
}
|
|
return rval;
|
|
}
|
|
|
|
void MariaDBServer::update_server_version()
|
|
{
|
|
auto conn = m_server_base->con;
|
|
auto srv = m_server_base->server;
|
|
mxs_mysql_update_server_version(srv, conn);
|
|
|
|
m_srv_type = server_type::UNKNOWN; // TODO: Use type information in SERVER directly
|
|
auto base_server_type = srv->type();
|
|
MYSQL_RES* result;
|
|
if (base_server_type == SERVER::Type::CLUSTRIX)
|
|
{
|
|
m_srv_type = server_type::CLUSTRIX;
|
|
}
|
|
// Check whether this server is a MaxScale Binlog Server.
|
|
else if (mxs_mysql_query(conn, "SELECT @@maxscale_version") == 0
|
|
&& (result = mysql_store_result(conn)) != NULL)
|
|
{
|
|
m_srv_type = server_type::BINLOG_ROUTER;
|
|
mysql_free_result(result);
|
|
}
|
|
else
|
|
{
|
|
/* Not a binlog server, check version number and supported features. */
|
|
m_srv_type = server_type::NORMAL;
|
|
m_capabilities = Capabilities();
|
|
SERVER::Version info = srv->version();
|
|
auto major = info.major;
|
|
auto minor = info.minor;
|
|
auto patch = info.patch;
|
|
// MariaDB/MySQL 5.5 is the oldest supported version. MySQL 6 and later are treated as 5.5.
|
|
if ((major == 5 && minor >= 5) || major > 5)
|
|
{
|
|
m_capabilities.basic_support = true;
|
|
// For more specific features, at least MariaDB 10.X is needed.
|
|
if (base_server_type == SERVER::Type::MARIADB && major >= 10)
|
|
{
|
|
// 10.0.2 or 10.1.X or greater than 10
|
|
if (((minor == 0 && patch >= 2) || minor >= 1) || major > 10)
|
|
{
|
|
m_capabilities.gtid = true;
|
|
}
|
|
// 10.1.2 (10.1.1 has limited support, not enough) or 10.2.X or greater than 10
|
|
if (((minor == 1 && patch >= 2) || minor >= 2) || major > 10)
|
|
{
|
|
m_capabilities.max_statement_time = true;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("MariaDB/MySQL version of '%s' (%s) is less than 5.5, which is not supported. "
|
|
"The server is ignored by the monitor.", name(), srv->version_string().c_str());
|
|
}
|
|
}
|
|
}
|
|
|
|
void MariaDBServer::check_permissions()
|
|
{
|
|
// Test with a typical query to make sure the monitor has sufficient permissions.
|
|
const string query = "SHOW SLAVE STATUS;";
|
|
string err_msg;
|
|
auto result = execute_query(query, &err_msg);
|
|
|
|
if (result.get() == NULL)
|
|
{
|
|
/* In theory, this could be due to other errors as well, but that is quite unlikely since the
|
|
* connection was just checked. The end result is in any case that the server is not updated,
|
|
* and that this test is retried next round. */
|
|
set_status(SERVER_AUTH_ERROR);
|
|
// Only print error if last round was ok.
|
|
if (!had_status(SERVER_AUTH_ERROR))
|
|
{
|
|
MXS_WARNING("Error during monitor permissions test for server '%s': %s", name(), err_msg.c_str());
|
|
}
|
|
}
|
|
else
|
|
{
|
|
clear_status(SERVER_AUTH_ERROR);
|
|
}
|
|
}
|
|
|
|
void MariaDBServer::clear_status(uint64_t bits)
|
|
{
|
|
m_server_base->clear_pending_status(bits);
|
|
}
|
|
|
|
void MariaDBServer::set_status(uint64_t bits)
|
|
{
|
|
m_server_base->set_pending_status(bits);
|
|
}
|
|
|
|
/**
|
|
* Compare if the given slave status array is equal to the one stored in the MariaDBServer.
|
|
* Only compares the parts relevant for building replication topology: slave IO/SQL state,
|
|
* host:port and master server id:s. When unsure, return false. This must match
|
|
* 'build_replication_graph()' in the monitor class.
|
|
*
|
|
* @param new_slave_status Right hand side
|
|
* @return True if equal
|
|
*/
|
|
bool MariaDBServer::sstatus_array_topology_equal(const SlaveStatusArray& new_slave_status)
|
|
{
|
|
bool rval = true;
|
|
const SlaveStatusArray& old_slave_status = m_slave_status;
|
|
if (old_slave_status.size() != new_slave_status.size())
|
|
{
|
|
rval = false;
|
|
}
|
|
else
|
|
{
|
|
for (size_t i = 0; i < old_slave_status.size(); i++)
|
|
{
|
|
const auto new_row = new_slave_status[i];
|
|
const auto old_row = old_slave_status[i];
|
|
// Strictly speaking, the following should depend on the 'assume_unique_hostnames',
|
|
// but the situations it would make a difference are so rare they can be ignored.
|
|
if (new_row.slave_io_running != old_row.slave_io_running
|
|
|| new_row.slave_sql_running != old_row.slave_sql_running
|
|
|| new_row.settings.master_endpoint != old_row.settings.master_endpoint
|
|
|| new_row.settings.name != old_row.settings.name
|
|
|| new_row.master_server_id != old_row.master_server_id)
|
|
{
|
|
rval = false;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return rval;
|
|
}
|
|
|
|
/**
|
|
* Check the slave status array stored in the MariaDBServer and find the row matching the connection in
|
|
* 'search_row'.
|
|
*
|
|
* @param search_row What connection to search for
|
|
* @param guess_ind Index where the search row could be located at. If incorrect, the array is searched.
|
|
* @return The found row or NULL if not found
|
|
*/
|
|
const SlaveStatus* MariaDBServer::sstatus_find_previous_row(const SlaveStatus& search_row, size_t guess_ind)
|
|
{
|
|
// Helper function. Checks if the connection in the new row is to the same server than in the old row.
|
|
auto compare_rows = [](const SlaveStatus& lhs, const SlaveStatus& rhs) -> bool {
|
|
return lhs.settings.name == rhs.settings.name
|
|
&& lhs.settings.master_endpoint == rhs.settings.master_endpoint;
|
|
};
|
|
|
|
// Usually the same slave connection can be found from the same index than in the previous slave
|
|
// status array, but this is not 100% (e.g. dba has just added a new connection).
|
|
const SlaveStatus* rval = NULL;
|
|
if (guess_ind < m_slave_status.size() && compare_rows(m_slave_status[guess_ind], search_row))
|
|
{
|
|
rval = &m_slave_status[guess_ind];
|
|
}
|
|
else
|
|
{
|
|
// The correct connection was not found where it should have been. Try looping.
|
|
for (const SlaveStatus& old_row : m_slave_status)
|
|
{
|
|
if (compare_rows(old_row, search_row))
|
|
{
|
|
rval = &old_row;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return rval;
|
|
}
|
|
|
|
bool MariaDBServer::can_be_demoted_switchover(string* reason_out)
|
|
{
|
|
bool demotable = false;
|
|
string reason;
|
|
string query_error;
|
|
|
|
if (!is_usable())
|
|
{
|
|
reason = "it is not running or it is in maintenance.";
|
|
}
|
|
else if (!update_replication_settings(&query_error))
|
|
{
|
|
reason = string_printf("it could not be queried: %s", query_error.c_str());
|
|
}
|
|
else if (!binlog_on())
|
|
{
|
|
reason = "its binary log is disabled.";
|
|
}
|
|
else if (!is_master() && !m_rpl_settings.log_slave_updates)
|
|
{
|
|
// This means that gtid_binlog_pos cannot be trusted.
|
|
// TODO: reduce dependency on gtid_binlog_pos to get rid of this requirement
|
|
reason = "it is not the master and log_slave_updates is disabled.";
|
|
}
|
|
else if (m_gtid_binlog_pos.empty())
|
|
{
|
|
reason = "it does not have a 'gtid_binlog_pos'.";
|
|
}
|
|
else
|
|
{
|
|
demotable = true;
|
|
}
|
|
|
|
if (!demotable && reason_out)
|
|
{
|
|
*reason_out = reason;
|
|
}
|
|
return demotable;
|
|
}
|
|
|
|
bool MariaDBServer::can_be_demoted_failover(FailoverType failover_mode, string* reason_out)
|
|
{
|
|
bool demotable = false;
|
|
string reason;
|
|
|
|
if (is_master())
|
|
{
|
|
reason = "it is a running master.";
|
|
}
|
|
else if (is_running())
|
|
{
|
|
reason = "it is running.";
|
|
}
|
|
else if (failover_mode == FailoverType::SAFE && m_gtid_binlog_pos.empty())
|
|
{
|
|
reason = "it does not have a 'gtid_binlog_pos' and unsafe failover is disabled.";
|
|
}
|
|
else
|
|
{
|
|
demotable = true;
|
|
}
|
|
|
|
if (!demotable && reason_out)
|
|
{
|
|
*reason_out = reason;
|
|
}
|
|
return demotable;
|
|
}
|
|
|
|
bool MariaDBServer::can_be_promoted(OperationType op, const MariaDBServer* demotion_target,
|
|
string* reason_out)
|
|
{
|
|
bool promotable = false;
|
|
string reason;
|
|
string query_error;
|
|
|
|
auto sstatus = slave_connection_status(demotion_target);
|
|
if (is_master())
|
|
{
|
|
reason = "it is already the master.";
|
|
}
|
|
else if (!is_usable())
|
|
{
|
|
reason = "it is down or in maintenance.";
|
|
}
|
|
else if (op == OperationType::SWITCHOVER && is_low_on_disk_space())
|
|
{
|
|
// Failover promotion with low disk space is allowed since it's better than nothing.
|
|
reason = "it is low on disk space.";
|
|
}
|
|
else if (sstatus == NULL)
|
|
{
|
|
reason = string_printf("it is not replicating from '%s'.", demotion_target->name());
|
|
}
|
|
else if (sstatus->gtid_io_pos.empty())
|
|
{
|
|
reason = string_printf("its slave connection to '%s' is not using gtid.", demotion_target->name());
|
|
}
|
|
else if (op == OperationType::SWITCHOVER && sstatus->slave_io_running != SlaveStatus::SLAVE_IO_YES)
|
|
{
|
|
reason = string_printf("its slave connection to '%s' is broken.", demotion_target->name());
|
|
}
|
|
else if (!update_replication_settings(&query_error))
|
|
{
|
|
reason = string_printf("it could not be queried: %s", query_error.c_str());
|
|
}
|
|
else if (!binlog_on())
|
|
{
|
|
reason = "its binary log is disabled.";
|
|
}
|
|
else
|
|
{
|
|
promotable = true;
|
|
}
|
|
|
|
if (!promotable && reason_out)
|
|
{
|
|
*reason_out = reason;
|
|
}
|
|
return promotable;
|
|
}
|
|
|
|
const SlaveStatus* MariaDBServer::slave_connection_status(const MariaDBServer* target) const
|
|
{
|
|
mxb_assert(target);
|
|
// The slave node may have several slave connections, need to find the one that is
|
|
// connected to the parent. Most of this has already been done in 'build_replication_graph'.
|
|
const SlaveStatus* rval = NULL;
|
|
for (const SlaveStatus& ss : m_slave_status)
|
|
{
|
|
if (ss.master_server == target)
|
|
{
|
|
rval = &ss;
|
|
break;
|
|
}
|
|
}
|
|
return rval;
|
|
}
|
|
|
|
const SlaveStatus* MariaDBServer::slave_connection_status_host_port(const MariaDBServer* target) const
|
|
{
|
|
EndPoint target_endpoint(target->m_server_base->server);
|
|
for (const SlaveStatus& ss : m_slave_status)
|
|
{
|
|
if (ss.settings.master_endpoint == target_endpoint)
|
|
{
|
|
return &ss;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
bool MariaDBServer::enable_events(BinlogMode binlog_mode, const EventNameSet& event_names, json_t** error_out)
|
|
{
|
|
EventStatusMapper mapper = [&event_names](const EventInfo& event) {
|
|
string rval;
|
|
if (event_names.count(event.name) > 0
|
|
&& (event.status == "SLAVESIDE_DISABLED" || event.status == "DISABLED"))
|
|
{
|
|
rval = "ENABLE";
|
|
}
|
|
return rval;
|
|
};
|
|
return alter_events(binlog_mode, mapper, error_out);
|
|
|
|
}
|
|
|
|
bool MariaDBServer::disable_events(BinlogMode binlog_mode, json_t** error_out)
|
|
{
|
|
EventStatusMapper mapper = [](const EventInfo& event) {
|
|
string rval;
|
|
if (event.status == "ENABLED")
|
|
{
|
|
rval = "DISABLE ON SLAVE";
|
|
}
|
|
return rval;
|
|
};
|
|
return alter_events(binlog_mode, mapper, error_out);
|
|
}
|
|
|
|
/**
|
|
* Alter scheduled server events.
|
|
*
|
|
* @param binlog_mode Should binary logging be disabled while performing this task.
|
|
* @param mapper A function which takes an event and returns the requested event state. If empty is returned,
|
|
* event is not altered.
|
|
* @param error_out Error output
|
|
* @return True if all requested alterations succeeded.
|
|
*/
|
|
bool
|
|
MariaDBServer::alter_events(BinlogMode binlog_mode, const EventStatusMapper& mapper, json_t** error_out)
|
|
{
|
|
// If the server is rejoining the cluster, no events may be added to binlog. The ALTER EVENT query
|
|
// itself adds events. To prevent this, disable the binlog for this method.
|
|
string error_msg;
|
|
const bool disable_binlog = (binlog_mode == BinlogMode::BINLOG_OFF);
|
|
if (disable_binlog)
|
|
{
|
|
if (!execute_cmd("SET @@session.sql_log_bin=0;", &error_msg))
|
|
{
|
|
const char FMT[] = "Could not disable session binlog on '%s': %s Server events not disabled.";
|
|
PRINT_MXS_JSON_ERROR(error_out, FMT, name(), error_msg.c_str());
|
|
return false;
|
|
}
|
|
}
|
|
|
|
int target_events = 0;
|
|
int events_altered = 0;
|
|
// Helper function which alters an event depending on the mapper-function.
|
|
EventManipulator alterer = [this, &target_events, &events_altered, &mapper](const EventInfo& event,
|
|
json_t** error_out) {
|
|
string target_state = mapper(event);
|
|
if (!target_state.empty())
|
|
{
|
|
target_events++;
|
|
if (alter_event(event, target_state, error_out))
|
|
{
|
|
events_altered++;
|
|
}
|
|
}
|
|
};
|
|
|
|
bool rval = false;
|
|
// TODO: For better error handling, this function should try to re-enable any disabled events if a later
|
|
// disable fails.
|
|
if (events_foreach(alterer, error_out))
|
|
{
|
|
if (target_events > 0)
|
|
{
|
|
warn_event_scheduler();
|
|
}
|
|
if (target_events == events_altered)
|
|
{
|
|
rval = true;
|
|
}
|
|
}
|
|
|
|
if (disable_binlog)
|
|
{
|
|
// Failure in re-enabling the session binlog doesn't really matter because we don't want the monitor
|
|
// generating binlog events anyway.
|
|
execute_cmd("SET @@session.sql_log_bin=1;");
|
|
}
|
|
return rval;
|
|
}
|
|
|
|
/**
|
|
* Print a warning if the event scheduler is off.
|
|
*/
|
|
void MariaDBServer::warn_event_scheduler()
|
|
{
|
|
string error_msg;
|
|
const string scheduler_query = "SELECT * FROM information_schema.PROCESSLIST "
|
|
"WHERE User = 'event_scheduler' AND Command = 'Daemon';";
|
|
auto proc_list = execute_query(scheduler_query, &error_msg);
|
|
if (proc_list.get() == NULL)
|
|
{
|
|
MXS_ERROR("Could not query the event scheduler status of '%s': %s", name(), error_msg.c_str());
|
|
}
|
|
else
|
|
{
|
|
if (proc_list->get_row_count() < 1)
|
|
{
|
|
// This is ok, though unexpected since events were found.
|
|
MXS_WARNING("Event scheduler is inactive on '%s' although events were found.", name());
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Run the manipulator function on every server event.
|
|
*
|
|
* @param func The manipulator function
|
|
* @param error_out Error output
|
|
* @return True if event information could be read from information_schema.EVENTS. The return value does not
|
|
* depend on the manipulator function.
|
|
*/
|
|
bool MariaDBServer::events_foreach(EventManipulator& func, json_t** error_out)
|
|
{
|
|
string error_msg;
|
|
// Get info about all scheduled events on the server.
|
|
auto event_info = execute_query("SELECT * FROM information_schema.EVENTS;", &error_msg);
|
|
if (event_info.get() == NULL)
|
|
{
|
|
MXS_ERROR("Could not query event status of '%s': %s Event handling can be disabled by "
|
|
"setting '%s' to false.",
|
|
name(), error_msg.c_str(), CN_HANDLE_EVENTS);
|
|
return false;
|
|
}
|
|
|
|
auto db_name_ind = event_info->get_col_index("EVENT_SCHEMA");
|
|
auto event_name_ind = event_info->get_col_index("EVENT_NAME");
|
|
auto event_definer_ind = event_info->get_col_index("DEFINER");
|
|
auto event_status_ind = event_info->get_col_index("STATUS");
|
|
mxb_assert(db_name_ind > 0 && event_name_ind > 0 && event_definer_ind > 0 && event_status_ind > 0);
|
|
|
|
while (event_info->next_row())
|
|
{
|
|
EventInfo event;
|
|
event.name = event_info->get_string(db_name_ind) + "." + event_info->get_string(event_name_ind);
|
|
event.definer = event_info->get_string(event_definer_ind);
|
|
event.status = event_info->get_string(event_status_ind);
|
|
func(event, error_out);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Alter a scheduled server event, setting its status.
|
|
*
|
|
* @param event Event to alter
|
|
* @param target_status Status to set
|
|
* @param error_out Error output
|
|
* @return True if status was set
|
|
*/
|
|
bool MariaDBServer::alter_event(const EventInfo& event, const string& target_status, json_t** error_out)
|
|
{
|
|
bool rval = false;
|
|
string error_msg;
|
|
// An ALTER EVENT by default changes the definer (owner) of the event to the monitor user.
|
|
// This causes problems if the monitor user does not have privileges to run
|
|
// the event contents. Prevent this by setting definer explicitly.
|
|
// The definer may be of the form user@host. If host includes %, then it must be quoted.
|
|
// For simplicity, quote the host always.
|
|
string quoted_definer;
|
|
auto loc_at = event.definer.find('@');
|
|
if (loc_at != string::npos)
|
|
{
|
|
auto host_begin = loc_at + 1;
|
|
quoted_definer = event.definer.substr(0, loc_at + 1)
|
|
+ // host_begin may be the null-char if @ was the last char
|
|
"'" + event.definer.substr(host_begin, string::npos) + "'";
|
|
}
|
|
else
|
|
{
|
|
// Just the username
|
|
quoted_definer = event.definer;
|
|
}
|
|
|
|
string alter_event_query = string_printf("ALTER DEFINER = %s EVENT %s %s;",
|
|
quoted_definer.c_str(),
|
|
event.name.c_str(),
|
|
target_status.c_str());
|
|
if (execute_cmd(alter_event_query, &error_msg))
|
|
{
|
|
rval = true;
|
|
const char FMT[] = "Event '%s' on server '%s' set to '%s'.";
|
|
MXS_NOTICE(FMT, event.name.c_str(), name(), target_status.c_str());
|
|
}
|
|
else
|
|
{
|
|
const char FMT[] = "Could not alter event '%s' on server '%s': %s";
|
|
PRINT_MXS_JSON_ERROR(error_out, FMT, event.name.c_str(), name(), error_msg.c_str());
|
|
}
|
|
return rval;
|
|
}
|
|
|
|
bool MariaDBServer::reset_all_slave_conns(json_t** error_out)
|
|
{
|
|
string error_msg;
|
|
bool error = false;
|
|
for (const auto& slave_conn : m_slave_status)
|
|
{
|
|
auto conn_name = slave_conn.settings.name;
|
|
auto stop = string_printf("STOP SLAVE '%s';", conn_name.c_str());
|
|
auto reset = string_printf("RESET SLAVE '%s' ALL;", conn_name.c_str());
|
|
if (!execute_cmd(stop, &error_msg) || !execute_cmd(reset, &error_msg))
|
|
{
|
|
error = true;
|
|
string log_message = conn_name.empty() ?
|
|
string_printf("Error when reseting the default slave connection of '%s': %s",
|
|
name(), error_msg.c_str()) :
|
|
string_printf("Error when reseting the slave connection '%s' of '%s': %s",
|
|
conn_name.c_str(), name(), error_msg.c_str());
|
|
PRINT_MXS_JSON_ERROR(error_out, "%s", log_message.c_str());
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!error && !m_slave_status.empty())
|
|
{
|
|
MXS_NOTICE("Removed %lu slave connection(s) from '%s'.", m_slave_status.size(), name());
|
|
}
|
|
return !error;
|
|
}
|
|
|
|
bool MariaDBServer::promote(GeneralOpData& general, ServerOperation& promotion, OperationType type,
|
|
const MariaDBServer* demotion_target)
|
|
{
|
|
mxb_assert(type == OperationType::SWITCHOVER || type == OperationType::FAILOVER
|
|
|| type == OperationType::UNDO_DEMOTION);
|
|
json_t** const error_out = general.error_out;
|
|
|
|
StopWatch timer;
|
|
bool stopped = false;
|
|
if (type == OperationType::SWITCHOVER || type == OperationType::FAILOVER)
|
|
{
|
|
// In normal circumstances, this should only be called for a master-slave pair.
|
|
auto master_conn = slave_connection_status(demotion_target);
|
|
mxb_assert(master_conn);
|
|
if (master_conn == NULL)
|
|
{
|
|
PRINT_MXS_JSON_ERROR(error_out,
|
|
"'%s' is not a slave of '%s' and cannot be promoted to its place.",
|
|
name(), demotion_target->name());
|
|
return false;
|
|
}
|
|
|
|
// Step 1: Stop & reset slave connections. If doing a failover, only remove the connection to demotion
|
|
// target. In case of switchover, remove other slave connections as well since the demotion target
|
|
// will take them over.
|
|
if (type == OperationType::SWITCHOVER)
|
|
{
|
|
stopped = remove_slave_conns(general, m_slave_status);
|
|
}
|
|
else if (type == OperationType::FAILOVER)
|
|
{
|
|
stopped = remove_slave_conns(general, {*master_conn});
|
|
}
|
|
}
|
|
|
|
bool success = false;
|
|
if (stopped || type == OperationType::UNDO_DEMOTION)
|
|
{
|
|
// Step 2: If demotion target is master, meaning this server will become the master,
|
|
// enable writing and scheduled events. Also, run promotion_sql_file.
|
|
bool promotion_error = false;
|
|
if (promotion.to_from_master)
|
|
{
|
|
// Disabling read-only should be quick.
|
|
bool ro_disabled = set_read_only(ReadOnlySetting::DISABLE, general.time_remaining, error_out);
|
|
general.time_remaining -= timer.restart();
|
|
if (!ro_disabled)
|
|
{
|
|
promotion_error = true;
|
|
}
|
|
else
|
|
{
|
|
if (m_settings.handle_event_scheduler)
|
|
{
|
|
// TODO: Add query replying to enable_events
|
|
bool events_enabled = enable_events(BinlogMode::BINLOG_OFF, promotion.events_to_enable,
|
|
error_out);
|
|
general.time_remaining -= timer.restart();
|
|
if (!events_enabled)
|
|
{
|
|
promotion_error = true;
|
|
PRINT_MXS_JSON_ERROR(error_out, "Failed to enable events on '%s'.", name());
|
|
}
|
|
}
|
|
|
|
// Run promotion_sql_file if no errors so far.
|
|
const string& sql_file = m_settings.promotion_sql_file;
|
|
if (!promotion_error && !sql_file.empty())
|
|
{
|
|
bool file_ran_ok = run_sql_from_file(sql_file, error_out);
|
|
general.time_remaining -= timer.restart();
|
|
if (!file_ran_ok)
|
|
{
|
|
promotion_error = true;
|
|
PRINT_MXS_JSON_ERROR(error_out,
|
|
"Execution of file '%s' failed during promotion of server '%s'.",
|
|
sql_file.c_str(), name());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Step 3: Copy or merge slave connections from demotion target. The logic used depends on the
|
|
// operation.
|
|
if (!promotion_error)
|
|
{
|
|
if (type == OperationType::SWITCHOVER)
|
|
{
|
|
if (copy_slave_conns(general, promotion.conns_to_copy, demotion_target))
|
|
{
|
|
success = true;
|
|
}
|
|
else
|
|
{
|
|
PRINT_MXS_JSON_ERROR(error_out, "Could not copy slave connections from '%s' to '%s'.",
|
|
demotion_target->name(), name());
|
|
}
|
|
}
|
|
else if (type == OperationType::FAILOVER)
|
|
{
|
|
if (merge_slave_conns(general, promotion.conns_to_copy))
|
|
{
|
|
success = true;
|
|
}
|
|
else
|
|
{
|
|
PRINT_MXS_JSON_ERROR(error_out, "Could not merge slave connections from '%s' to '%s'.",
|
|
demotion_target->name(), name());
|
|
}
|
|
}
|
|
else if (type == OperationType::UNDO_DEMOTION)
|
|
{
|
|
if (copy_slave_conns(general, promotion.conns_to_copy, nullptr))
|
|
{
|
|
success = true;
|
|
}
|
|
else
|
|
{
|
|
PRINT_MXS_JSON_ERROR(error_out, "Could not restore slave connections of '%s' when "
|
|
"reversing demotion.", name());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return success;
|
|
}
|
|
|
|
bool MariaDBServer::demote(GeneralOpData& general, ServerOperation& demotion, OperationType type)
|
|
{
|
|
mxb_assert(demotion.target == this);
|
|
mxb_assert(type == OperationType::SWITCHOVER || type == OperationType::REJOIN);
|
|
json_t** const error_out = general.error_out;
|
|
bool success = false;
|
|
|
|
// Step 1: Stop & reset slave connections. The promotion target will copy them. The connection
|
|
// information has been backed up in the operation object.
|
|
if (remove_slave_conns(general, m_slave_status))
|
|
{
|
|
// Step 2: If this server is master, disable writes and scheduled events, flush logs,
|
|
// update gtid:s, run demotion_sql_file.
|
|
|
|
// In theory, this part should be ran in the opposite order so it would "reverse"
|
|
// the promotion code. However, it's probably better to run the most
|
|
// likely part to fail, setting read_only=1, first to make undoing easier. Setting
|
|
// read_only may fail if another session has table locks or is doing long writes.
|
|
bool demotion_error = false;
|
|
if (demotion.to_from_master)
|
|
{
|
|
// The server should either be the master or be a standalone being rejoined.
|
|
mxb_assert(is_master() || m_slave_status.empty());
|
|
|
|
// Step 2a: Remove [Master] from this server. This prevents compatible routers (RWS)
|
|
// from routing writes to this server. Writes in flight will go through, at least until
|
|
// read_only is set.
|
|
clear_status(SERVER_MASTER);
|
|
// Step 2b: If other users with SUPER privileges are on, kick them out now since
|
|
// read_only doesn't stop them from doing writes. This does not stop them from immediately
|
|
// logging back in but it's better than nothing. This also stops super-user writes going
|
|
// through MaxScale.
|
|
if (type == OperationType::SWITCHOVER && !kick_out_super_users(general))
|
|
{
|
|
demotion_error = true;
|
|
}
|
|
|
|
// Step 2c: Enabling read-only can take time if writes are on or table locks taken.
|
|
StopWatch timer;
|
|
if (!demotion_error)
|
|
{
|
|
bool ro_enabled = set_read_only(ReadOnlySetting::ENABLE, general.time_remaining, error_out);
|
|
general.time_remaining -= timer.lap();
|
|
if (!ro_enabled)
|
|
{
|
|
demotion_error = true;
|
|
}
|
|
}
|
|
|
|
if (!demotion_error && m_settings.handle_event_scheduler)
|
|
{
|
|
// TODO: Add query replying to enable_events
|
|
// Step 2b: Using BINLOG_OFF to avoid adding any gtid events,
|
|
// which could break external replication.
|
|
bool events_disabled = disable_events(BinlogMode::BINLOG_OFF, error_out);
|
|
general.time_remaining -= timer.lap();
|
|
if (!events_disabled)
|
|
{
|
|
demotion_error = true;
|
|
PRINT_MXS_JSON_ERROR(error_out, "Failed to disable events on '%s'.", name());
|
|
}
|
|
}
|
|
|
|
// Step 2e: Run demotion_sql_file if no errors so far.
|
|
const string& sql_file = m_settings.demotion_sql_file;
|
|
if (!demotion_error && !sql_file.empty())
|
|
{
|
|
bool file_ran_ok = run_sql_from_file(sql_file, error_out);
|
|
general.time_remaining -= timer.lap();
|
|
if (!file_ran_ok)
|
|
{
|
|
demotion_error = true;
|
|
PRINT_MXS_JSON_ERROR(error_out,
|
|
"Execution of file '%s' failed during demotion of server '%s'.",
|
|
sql_file.c_str(), name());
|
|
}
|
|
}
|
|
|
|
if (!demotion_error)
|
|
{
|
|
// Step 2f: FLUSH LOGS to ensure that all events have been written to binlog.
|
|
string error_msg;
|
|
bool logs_flushed = execute_cmd_time_limit("FLUSH LOGS;", general.time_remaining,
|
|
&error_msg);
|
|
general.time_remaining -= timer.lap();
|
|
if (!logs_flushed)
|
|
{
|
|
demotion_error = true;
|
|
PRINT_MXS_JSON_ERROR(error_out,
|
|
"Failed to flush binary logs of '%s' during demotion: %s.",
|
|
name(), error_msg.c_str());
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!demotion_error)
|
|
{
|
|
// Finally, update gtid:s.
|
|
string error_msg;
|
|
if (update_gtids(&error_msg))
|
|
{
|
|
success = true;
|
|
}
|
|
else
|
|
{
|
|
demotion_error = true;
|
|
PRINT_MXS_JSON_ERROR(error_out, "Failed to update gtid:s of '%s' during demotion: %s.",
|
|
name(), error_msg.c_str());
|
|
}
|
|
}
|
|
|
|
if (demotion_error && demotion.to_from_master)
|
|
{
|
|
// Read_only was enabled (or tried to be enabled) but a later step failed.
|
|
// Disable read_only. Connection is likely broken so use a short time limit.
|
|
// Even this is insufficient, because the server may still be executing the old
|
|
// 'SET GLOBAL read_only=1' query.
|
|
// TODO: add smarter undo, KILL QUERY etc.
|
|
set_read_only(ReadOnlySetting::DISABLE, Duration((double)0), NULL);
|
|
}
|
|
}
|
|
return success;
|
|
}
|
|
|
|
/**
|
|
* Stop and optionally reset/reset-all a slave connection.
|
|
*
|
|
* @param conn_name Slave connection name. Use empty string for the nameless connection.
|
|
* @param mode STOP, RESET or RESET ALL
|
|
* @param time_limit Operation time limit
|
|
* @param error_out Error output
|
|
* @return True on success
|
|
*/
|
|
bool MariaDBServer::stop_slave_conn(const std::string& conn_name, StopMode mode, Duration time_limit,
|
|
json_t** error_out)
|
|
{
|
|
/* STOP SLAVE is a bit problematic, since sometimes it seems to take several seconds to complete.
|
|
* If this time is greater than the connection read timeout, connector-c will cut the connection/
|
|
* query. The query is likely completed afterwards by the server. To prevent false errors,
|
|
* try the query repeatedly until time is up. Fortunately, the server doesn't consider stopping
|
|
* an already stopped slave connection an error. */
|
|
Duration time_left = time_limit;
|
|
StopWatch timer;
|
|
string stop = string_printf("STOP SLAVE '%s';", conn_name.c_str());
|
|
string error_msg;
|
|
bool stop_success = execute_cmd_time_limit(stop, time_left, &error_msg);
|
|
time_left -= timer.restart();
|
|
|
|
bool rval = false;
|
|
if (stop_success)
|
|
{
|
|
// The RESET SLAVE-query can also take a while if there is lots of relay log to delete.
|
|
// Very rare, though.
|
|
if (mode == StopMode::RESET || mode == StopMode::RESET_ALL)
|
|
{
|
|
string reset = string_printf("RESET SLAVE '%s'%s;",
|
|
conn_name.c_str(), (mode == StopMode::RESET_ALL) ? " ALL" : "");
|
|
if (execute_cmd_time_limit(reset, time_left, &error_msg))
|
|
{
|
|
rval = true;
|
|
}
|
|
else
|
|
{
|
|
PRINT_MXS_JSON_ERROR(error_out, "Failed to reset slave connection on '%s': %s",
|
|
name(), error_msg.c_str());
|
|
}
|
|
}
|
|
else
|
|
{
|
|
rval = true;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
PRINT_MXS_JSON_ERROR(error_out, "Failed to stop slave connection on '%s': %s",
|
|
name(), error_msg.c_str());
|
|
}
|
|
return rval;
|
|
}
|
|
|
|
/**
|
|
* Removes the given slave connections from the server and then updates slave connection status.
|
|
* The slave connections of the server object will change during this method, so any pointers and
|
|
* references to such may be invalidated and should be re-acquired.
|
|
*
|
|
* @param op Operation descriptor
|
|
* @param conns_to_remove Which connections should be removed
|
|
* @return True if successful
|
|
*/
|
|
bool MariaDBServer::remove_slave_conns(GeneralOpData& op, const SlaveStatusArray& conns_to_remove)
|
|
{
|
|
json_t** error_out = op.error_out;
|
|
maxbase::Duration& time_remaining = op.time_remaining;
|
|
StopWatch timer;
|
|
// Take a backup of the soon to be removed connections so they can be compared properly after an update.
|
|
SlaveStatusArray conns_to_remove_copy = conns_to_remove;
|
|
|
|
bool stop_slave_error = false;
|
|
for (size_t i = 0; !stop_slave_error && i < conns_to_remove.size(); i++)
|
|
{
|
|
if (!stop_slave_conn(conns_to_remove[i].settings.name, StopMode::RESET_ALL, time_remaining,
|
|
error_out))
|
|
{
|
|
stop_slave_error = true;
|
|
}
|
|
time_remaining -= timer.lap();
|
|
}
|
|
|
|
bool success = false;
|
|
if (stop_slave_error)
|
|
{
|
|
PRINT_MXS_JSON_ERROR(error_out, "Failed to remove slave connection(s) from '%s'.", name());
|
|
}
|
|
else
|
|
{
|
|
// Check that the slave connections are really gone by comparing connection names. It's probably
|
|
// enough to just update the slave status. Checking that the connections are really gone is
|
|
// likely overkill, but doesn't hurt.
|
|
string error_msg;
|
|
if (do_show_slave_status(&error_msg))
|
|
{
|
|
// Insert all existing connection names to a set, then check that none of the removed ones are
|
|
// there.
|
|
std::set<string> connection_names;
|
|
for (auto& slave_conn : m_slave_status)
|
|
{
|
|
connection_names.insert(slave_conn.settings.name);
|
|
}
|
|
int found = 0;
|
|
for (auto& removed_conn : conns_to_remove_copy)
|
|
{
|
|
if (connection_names.count(removed_conn.settings.name) > 0)
|
|
{
|
|
found++;
|
|
}
|
|
}
|
|
|
|
if (found == 0)
|
|
{
|
|
success = true;
|
|
}
|
|
else
|
|
{
|
|
// This means server is really bugging.
|
|
PRINT_MXS_JSON_ERROR(error_out,
|
|
"'%s' still has %i removed slave connections, "
|
|
"RESET SLAVE must have failed.", name(), found);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
PRINT_MXS_JSON_ERROR(error_out, "Failed to update slave connections of '%s': %s",
|
|
name(), error_msg.c_str());
|
|
}
|
|
}
|
|
time_remaining -= timer.lap();
|
|
return success;
|
|
}
|
|
|
|
bool MariaDBServer::set_read_only(ReadOnlySetting setting, maxbase::Duration time_limit, json_t** error_out)
|
|
{
|
|
int new_val = (setting == ReadOnlySetting::ENABLE) ? 1 : 0;
|
|
string cmd = string_printf("SET GLOBAL read_only=%i;", new_val);
|
|
string error_msg;
|
|
bool success = execute_cmd_time_limit(cmd, time_limit, &error_msg);
|
|
if (!success)
|
|
{
|
|
string target_str = (setting == ReadOnlySetting::ENABLE) ? "enable" : "disable";
|
|
PRINT_MXS_JSON_ERROR(error_out,
|
|
"Failed to %s read_only on '%s': %s",
|
|
target_str.c_str(), name(), error_msg.c_str());
|
|
}
|
|
return success;
|
|
}
|
|
|
|
/**
|
|
* Merge slave connections to this server (promotion target). This should only
|
|
* be used during failover promotion.
|
|
*
|
|
* @param op Operation descriptor
|
|
* @param conns_to_merge Connections which should be merged
|
|
* @return True on success
|
|
*/
|
|
bool MariaDBServer::merge_slave_conns(GeneralOpData& op, const SlaveStatusArray& conns_to_merge)
|
|
{
|
|
/* When promoting a server during failover, the situation is more complicated than in switchover.
|
|
* Connections cannot be moved to the demotion target (= failed server) as it is off. This means
|
|
* that the promoting server must combine the roles of both itself and the failed server. Only the
|
|
* slave connection replicating from the failed server has been removed. This means that
|
|
* the promotion and demotion targets may have identical connections (connections going to
|
|
* the same server id or the same host:port). These connections should not be copied or modified.
|
|
* It's possible that the master had different settings for a duplicate slave connection,
|
|
* in this case the settings on the master are lost.
|
|
* TODO: think if the master's settings should take priority.
|
|
* Also, connection names may collide between the two servers, in this case try to generate
|
|
* a simple name for the new connection. */
|
|
|
|
// Helper function for checking if a slave connection should be ignored.
|
|
auto conn_can_be_merged = [this](const SlaveStatus& slave_conn, string* ignore_reason_out) -> bool {
|
|
bool accepted = true;
|
|
auto master_id = slave_conn.master_server_id;
|
|
EndPoint my_host_port(m_server_base->server);
|
|
// The connection is only merged if it satisfies the copy-conditions. Merging has also
|
|
// additional requirements.
|
|
string ignore_reason;
|
|
if (!slave_conn.should_be_copied(&ignore_reason))
|
|
{
|
|
accepted = false;
|
|
}
|
|
else if (master_id == m_server_id)
|
|
{
|
|
// This is not an error but indicates a complicated topology. In any case, ignore this.
|
|
accepted = false;
|
|
ignore_reason = string_printf("it points to '%s' (according to server id:s).", name());
|
|
}
|
|
else if (slave_conn.settings.master_endpoint == my_host_port)
|
|
{
|
|
accepted = false;
|
|
ignore_reason = string_printf("it points to '%s' (according to master host:port).", name());
|
|
}
|
|
else
|
|
{
|
|
// Compare to connections already existing on this server.
|
|
for (const SlaveStatus& my_slave_conn : m_slave_status)
|
|
{
|
|
if (my_slave_conn.seen_connected && my_slave_conn.master_server_id == master_id)
|
|
{
|
|
accepted = false;
|
|
const char format[] = "its Master_Server_Id (%" PRIi64
|
|
") matches an existing slave connection on '%s'.";
|
|
ignore_reason = string_printf(format, master_id, name());
|
|
}
|
|
else if (my_slave_conn.settings.master_endpoint == slave_conn.settings.master_endpoint)
|
|
{
|
|
accepted = false;
|
|
const auto& endpoint = slave_conn.settings.master_endpoint;
|
|
ignore_reason = string_printf(
|
|
"its Master_Host (%s) and Master_Port (%i) match an existing "
|
|
"slave connection on %s.",
|
|
endpoint.host().c_str(), endpoint.port(), name());
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!accepted)
|
|
{
|
|
*ignore_reason_out = ignore_reason;
|
|
}
|
|
return accepted;
|
|
};
|
|
|
|
// Need to keep track of connection names (both existing and new) to avoid using an existing name.
|
|
std::set<string> connection_names;
|
|
for (const auto& conn : m_slave_status)
|
|
{
|
|
connection_names.insert(conn.settings.name);
|
|
}
|
|
|
|
// Helper function which checks that a connection name is unique and modifies it if not.
|
|
auto check_modify_conn_name = [this, &connection_names](SlaveStatus::Settings* conn_settings) -> bool {
|
|
bool name_is_unique = false;
|
|
string conn_name = conn_settings->name;
|
|
if (connection_names.count(conn_name) > 0)
|
|
{
|
|
// If the name is used, generate a name using the host:port of the master,
|
|
// it should be unique.
|
|
string second_try = "To " + conn_settings->master_endpoint.to_string();
|
|
if (connection_names.count(second_try) > 0)
|
|
{
|
|
// Even this one exists, something is really wrong. Give up.
|
|
MXS_ERROR("Could not generate a unique connection name for '%s': both '%s' and '%s' are "
|
|
"already taken.", name(), conn_name.c_str(), second_try.c_str());
|
|
}
|
|
else
|
|
{
|
|
MXS_WARNING("A slave connection with name '%s' already exists on '%s', using generated "
|
|
"name '%s' instead.", conn_name.c_str(), name(), second_try.c_str());
|
|
conn_settings->name = second_try;
|
|
name_is_unique = true;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
name_is_unique = true;
|
|
}
|
|
return name_is_unique;
|
|
};
|
|
|
|
bool error = false;
|
|
for (size_t i = 0; !error && (i < conns_to_merge.size()); i++)
|
|
{
|
|
// Need a copy of the array element here since it may be modified.
|
|
SlaveStatus slave_conn = conns_to_merge[i];
|
|
string ignore_reason;
|
|
if (conn_can_be_merged(slave_conn, &ignore_reason))
|
|
{
|
|
auto& conn_settings = slave_conn.settings;
|
|
if (check_modify_conn_name(&conn_settings))
|
|
{
|
|
if (create_start_slave(op, conn_settings))
|
|
{
|
|
connection_names.insert(conn_settings.name);
|
|
}
|
|
else
|
|
{
|
|
error = true;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
error = true;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
mxb_assert(!ignore_reason.empty());
|
|
MXS_WARNING("%s was ignored when promoting '%s' because %s",
|
|
slave_conn.settings.to_string().c_str(), name(), ignore_reason.c_str());
|
|
}
|
|
}
|
|
|
|
return !error;
|
|
}
|
|
|
|
bool MariaDBServer::copy_slave_conns(GeneralOpData& op, const SlaveStatusArray& conns_to_copy,
|
|
const MariaDBServer* replacement)
|
|
{
|
|
mxb_assert(m_slave_status.empty());
|
|
bool start_slave_error = false;
|
|
for (size_t i = 0; i < conns_to_copy.size() && !start_slave_error; i++)
|
|
{
|
|
SlaveStatus slave_conn = conns_to_copy[i]; // slave_conn may be modified
|
|
string reason_not_copied;
|
|
if (slave_conn.should_be_copied(&reason_not_copied))
|
|
{
|
|
// Any slave connection that was going to this server itself is instead directed
|
|
// to the replacement server.
|
|
bool ok_to_copy = true;
|
|
if (slave_conn.master_server_id == m_server_id)
|
|
{
|
|
if (replacement)
|
|
{
|
|
slave_conn.settings.master_endpoint = EndPoint(replacement->m_server_base->server);
|
|
}
|
|
else
|
|
{
|
|
// This is only possible if replication is configured wrong and we are
|
|
// undoing a switchover demotion.
|
|
ok_to_copy = false;
|
|
MXB_WARNING("Server id:s of '%s' and %s are identical, not copying the connection "
|
|
"to '%s'.",
|
|
name(), slave_conn.settings.master_endpoint.to_string().c_str(), name());
|
|
}
|
|
}
|
|
|
|
if (ok_to_copy && !create_start_slave(op, slave_conn.settings))
|
|
{
|
|
start_slave_error = true;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MXS_WARNING("%s was not copied to '%s' because %s",
|
|
slave_conn.settings.to_string().c_str(), name(), reason_not_copied.c_str());
|
|
}
|
|
}
|
|
return !start_slave_error;
|
|
}
|
|
|
|
bool MariaDBServer::create_start_slave(GeneralOpData& op, const SlaveStatus::Settings& conn_settings)
|
|
{
|
|
maxbase::Duration& time_remaining = op.time_remaining;
|
|
StopWatch timer;
|
|
string error_msg;
|
|
bool success = false;
|
|
|
|
SlaveStatus::Settings new_settings(conn_settings.name, conn_settings.master_endpoint, name());
|
|
string change_master = generate_change_master_cmd(new_settings);
|
|
bool conn_created = execute_cmd_time_limit(change_master, time_remaining, &error_msg);
|
|
time_remaining -= timer.restart();
|
|
if (conn_created)
|
|
{
|
|
string start_slave = string_printf("START SLAVE '%s';", new_settings.name.c_str());
|
|
bool slave_started = execute_cmd_time_limit(start_slave, time_remaining, &error_msg);
|
|
time_remaining -= timer.restart();
|
|
if (slave_started)
|
|
{
|
|
success = true;
|
|
MXS_NOTICE("%s created and started.", new_settings.to_string().c_str());
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("%s could not be started: %s",
|
|
new_settings.to_string().c_str(), error_msg.c_str());
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// TODO: This may currently print out passwords.
|
|
MXS_ERROR("%s could not be created: %s",
|
|
new_settings.to_string().c_str(), error_msg.c_str());
|
|
}
|
|
return success;
|
|
}
|
|
|
|
/**
|
|
* Generate a CHANGE MASTER TO-query.
|
|
*
|
|
* @param conn_settings Existing slave connection settings to emulate
|
|
* @return Generated query
|
|
*/
|
|
string MariaDBServer::generate_change_master_cmd(const SlaveStatus::Settings& conn_settings)
|
|
{
|
|
string change_cmd;
|
|
change_cmd += string_printf("CHANGE MASTER '%s' TO MASTER_HOST = '%s', MASTER_PORT = %i, ",
|
|
conn_settings.name.c_str(),
|
|
conn_settings.master_endpoint.host().c_str(),
|
|
conn_settings.master_endpoint.port());
|
|
change_cmd += "MASTER_USE_GTID = current_pos, ";
|
|
if (m_settings.replication_ssl)
|
|
{
|
|
change_cmd += "MASTER_SSL = 1, ";
|
|
}
|
|
change_cmd += string_printf("MASTER_USER = '%s', ", m_settings.replication_user.c_str());
|
|
const char MASTER_PW[] = "MASTER_PASSWORD = '%s';";
|
|
#if defined (SS_DEBUG)
|
|
string change_cmd_nopw = change_cmd;
|
|
change_cmd_nopw += string_printf(MASTER_PW, "******");
|
|
MXS_DEBUG("Change master command is '%s'.", change_cmd_nopw.c_str());
|
|
#endif
|
|
change_cmd += string_printf(MASTER_PW, m_settings.replication_password.c_str());
|
|
return change_cmd;
|
|
}
|
|
|
|
bool
|
|
MariaDBServer::redirect_existing_slave_conn(GeneralOpData& op, const SlaveStatus::Settings& conn_settings,
|
|
const MariaDBServer* new_master)
|
|
{
|
|
auto error_out = op.error_out;
|
|
maxbase::Duration& time_remaining = op.time_remaining;
|
|
StopWatch timer;
|
|
bool success = false;
|
|
|
|
// First, just stop the slave connection.
|
|
string conn_name = conn_settings.name;
|
|
bool stopped = stop_slave_conn(conn_name, StopMode::STOP_ONLY, time_remaining, error_out);
|
|
time_remaining -= timer.restart();
|
|
if (stopped)
|
|
{
|
|
SlaveStatus::Settings modified_settings = conn_settings;
|
|
modified_settings.master_endpoint = EndPoint(new_master->m_server_base->server);
|
|
string change_master = generate_change_master_cmd(modified_settings);
|
|
|
|
string error_msg;
|
|
bool changed = execute_cmd_time_limit(change_master, time_remaining, &error_msg);
|
|
time_remaining -= timer.restart();
|
|
if (changed)
|
|
{
|
|
string start = string_printf("START SLAVE '%s';", conn_name.c_str());
|
|
bool started = execute_cmd_time_limit(start, time_remaining, &error_msg);
|
|
time_remaining -= timer.restart();
|
|
if (started)
|
|
{
|
|
success = true;
|
|
}
|
|
else
|
|
{
|
|
PRINT_MXS_JSON_ERROR(error_out,
|
|
"%s could not be started: %s",
|
|
modified_settings.to_string().c_str(), error_msg.c_str());
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// TODO: This may currently print out passwords.
|
|
PRINT_MXS_JSON_ERROR(error_out,
|
|
"%s could not be redirected to %s: %s",
|
|
conn_settings.to_string().c_str(),
|
|
modified_settings.master_endpoint.to_string().c_str(),
|
|
error_msg.c_str());
|
|
}
|
|
} // 'stop_slave_conn' prints its own errors
|
|
return success;
|
|
}
|
|
|
|
bool MariaDBServer::update_enabled_events()
|
|
{
|
|
string error_msg;
|
|
// Get names of all enabled scheduled events on the server.
|
|
auto event_info = execute_query("SELECT Event_schema, Event_name FROM information_schema.EVENTS WHERE "
|
|
"Status = 'ENABLED';", &error_msg);
|
|
if (event_info.get() == NULL)
|
|
{
|
|
MXS_ERROR("Could not query events of '%s': %s Event handling can be disabled by "
|
|
"setting '%s' to false.",
|
|
name(), error_msg.c_str(), CN_HANDLE_EVENTS);
|
|
return false;
|
|
}
|
|
|
|
auto db_name_ind = 0;
|
|
auto event_name_ind = 1;
|
|
|
|
EventNameSet full_names;
|
|
full_names.reserve(event_info->get_row_count());
|
|
|
|
while (event_info->next_row())
|
|
{
|
|
string full_name = event_info->get_string(db_name_ind) + "." + event_info->get_string(event_name_ind);
|
|
full_names.insert(full_name); // Ignore duplicates, they shouldn't exists.
|
|
}
|
|
|
|
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;
|
|
ConnectResult 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 == ConnectResult::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 == ConnectResult::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 some of the bits. User-set bits and some long-term bits
|
|
* can stay. */
|
|
server->clear_status(MonitorServer::SERVER_DOWN_CLEAR_BITS);
|
|
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;
|
|
}
|
|
|
|
|
|
bool MariaDBServer::kick_out_super_users(GeneralOpData& op)
|
|
{
|
|
bool error = false;
|
|
Duration time_remaining = op.time_remaining;
|
|
auto error_out = op.error_out;
|
|
// Only select unique rows...
|
|
string get_ids_query = "SELECT DISTINCT * FROM ("
|
|
// select conn id and username from live connections ...
|
|
"SELECT P.id,P.user FROM information_schema.PROCESSLIST as P "
|
|
// match with user information ...
|
|
"INNER JOIN mysql.user as U ON (U.user = P.user) WHERE "
|
|
// where the user has super-privileges, is not replicating ...
|
|
"(U.Super_priv = 'Y' AND P.COMMAND != 'Binlog Dump' "
|
|
// and is not the current user.
|
|
"AND P.id != (SELECT CONNECTION_ID()))) as I;";
|
|
|
|
string error_msg;
|
|
unsigned int error_num = 0;
|
|
auto res = execute_query(get_ids_query, &error_msg, &error_num);
|
|
if (res)
|
|
{
|
|
int id_col = 0;
|
|
int user_col = 1;
|
|
while (res->next_row())
|
|
{
|
|
auto conn_id = res->get_int(id_col);
|
|
auto user = res->get_string(user_col);
|
|
string kill_query = mxb::string_printf("KILL SOFT CONNECTION %li;", conn_id);
|
|
StopWatch timer;
|
|
if (execute_cmd_time_limit(kill_query, time_remaining, &error_msg))
|
|
{
|
|
MXB_WARNING("Killed connection id %lu to '%s' from super-user '%s' to prevent writes.",
|
|
conn_id, name(), user.c_str());
|
|
}
|
|
else
|
|
{
|
|
error = true;
|
|
PRINT_MXS_JSON_ERROR(error_out, "Could not kill connection %lu from super-user '%s': %s",
|
|
conn_id, user.c_str(), error_msg.c_str());
|
|
}
|
|
time_remaining -= timer.split();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// If query failed because of insufficient rights, don't consider this an error, just print a warning.
|
|
// Perhaps the user doesn't want the monitor doing this.
|
|
if (error_num == ER_DBACCESS_DENIED_ERROR || error_num == ER_TABLEACCESS_DENIED_ERROR
|
|
|| error_num == ER_COLUMNACCESS_DENIED_ERROR)
|
|
{
|
|
MXB_WARNING("Insufficient rights to query logged in super-users for server '%s': %s Super-users "
|
|
"may perform writes during the cluster manipulation operation.",
|
|
name(), error_msg.c_str());
|
|
}
|
|
else
|
|
{
|
|
error = true;
|
|
PRINT_MXS_JSON_ERROR(error_out, "Could not query connected super-users: %s", error_msg.c_str());
|
|
}
|
|
}
|
|
return !error;
|
|
}
|