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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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* Copyright (C) 2008 Sun Microsystems
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#ifndef DRIZZLED_RPL_MI_H
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#define DRIZZLED_RPL_MI_H
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#include "rpl_reporting.h"
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/*****************************************************************************
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- information about how to connect to a master
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- current master log name
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- current master log offset
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- misc control variables
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Master_info is initialized once from the master.info file if such
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exists. Otherwise, data members corresponding to master.info fields
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are initialized with defaults specified by master-* options. The
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initialization is done through init_master_info() call.
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The format of master.info file:
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To write out the contents of master.info file to disk ( needed every
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time we read and queue data from the master ), a call to
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flush_master_info() is required.
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To clean up, call end_master_info()
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*****************************************************************************/
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class Master_info : public Slave_reporting_capability
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/* the variables below are needed because we can change masters on the fly */
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char master_log_name[FN_REFLEN];
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char host[HOSTNAME_LENGTH+1];
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char user[USERNAME_LENGTH+1];
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char password[MAX_PASSWORD_LENGTH+1];
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my_off_t master_log_pos;
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File fd; // we keep the file open, so we need to remember the file pointer
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pthread_mutex_t data_lock,run_lock;
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pthread_cond_t data_cond,start_cond,stop_cond;
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uint32_t file_id; /* for 3.23 load data infile */
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uint32_t connect_retry;
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float heartbeat_period; // interface with CHANGE MASTER or master.info
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uint64_t received_heartbeats; // counter of received heartbeat events
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int events_till_disconnect;
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volatile bool abort_slave;
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volatile uint32_t slave_running;
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volatile uint32_t slave_run_id;
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The difference in seconds between the clock of the master and the clock of
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the slave (second - first). It must be signed as it may be <0 or >0.
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clock_diff_with_master is computed when the I/O thread starts; for this the
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I/O thread does a SELECT UNIX_TIMESTAMP() on the master.
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"how late the slave is compared to the master" is computed like this:
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clock_of_slave - last_timestamp_executed_by_SQL_thread - clock_diff_with_master
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long clock_diff_with_master;
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void init_master_log_pos(Master_info* mi);
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int init_master_info(Master_info* mi, const char* master_info_fname,
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const char* slave_info_fname,
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bool abort_if_no_master_info_file,
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void end_master_info(Master_info* mi);
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int flush_master_info(Master_info* mi, bool flush_relay_log_cache);
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#endif /* DRIZZLED_RPL_MI_H */