MySQL 5.6 主从报错一例

mysql_binlog_send
  ->sender.run()
    ->Binlog_sender::init
       ->Binlog_sender::check_start_file
  if ((file= open_binlog_file(&cache, m_linfo.log_file_name, &errmsg)) < 0) 
  {
    set_fatal_error(errmsg);
    return 1;
  }
  size= my_b_filelength(&cache);
  end_io_cache(&cache);
  mysql_file_close(file, MYF(MY_WME)); 
  if (m_start_pos > size)
  {
    set_fatal_error("Client requested master to start replication from "
                    "position > file size");
    return 1;
  }

mysql_binlog_send
  ->sender.run()
     ->Binlog_sender::init
     ->while (!has_error() && !m_thd->killed)
     #如果正常这里开始循环读取binlog event，如果前面出错则直接继续后面逻辑
     #如果有读取错误则报错
       my_snprintf(error_text, sizeof(error_text),
                  "%s; the first event '%s' at %lld, "
                  "the last event read from '%s' at %lld, "
                  "the last byte read from '%s' at %lld.",
                  m_errmsg,
                  m_start_file, m_start_pos, m_last_file, m_last_pos,
                  log_file, my_b_tell(&log_cache));