mha 0.58 gtid模式下 丟數據問題修復

問題描述：?

在gtid模式下? ，mha發生故障切換 ，如果Linux主機還存活? ，不會去比對master的日志，獲取差異日志 ，有導致數據丟失的風險 。

問題修復：

找到?MasterFailover.pm 文件? ?，將下文！ 去掉

????if?(?!$_server_manager->is_gtid_auto_pos_enabled()?)?{
??????$log->info();
??????$log->info("*?Phase?3.2:?Saving?Dead?Master's?Binlog?Phase..\n");
??????$log->info();
??????save_master_binlog($dead_master);
????}

去掉后的代碼

????if?(?$_server_manager->is_gtid_auto_pos_enabled()?)?{
??????$log->info();
??????$log->info("*?Phase?3.2:?Saving?Dead?Master's?Binlog?Phase..\n");
??????$log->info();
??????save_master_binlog($dead_master);
????}

找到?apply_binlog_to_master 函數定義的位置

sub?apply_binlog_to_master($)?{
??my?$target???=?shift;
??my?$err_file?=?"$g_workdir/mysql_from_binlog.err";
??my?$command?=
"cat?$_diff_binary_log??|?mysql?--binary-mode?--user=$target->{mysql_escaped_user}?--password=$target->{mysql_escaped_password}?--host=$target->{ip}?--port=$target->{port}?-vvv?--unbuffered?>?$err_file?2>&1";

??$log->info("Checking?if?super_read_only?is?defined?and?turned?on..");
??my?($super_read_only_enabled,?$dbh)?=
??????????MHA::SlaveUtil::check_if_super_read_only($target->{hostname},?$target->{ip},?$target->{port},?$target->{user},?$target->{password});
??if?($super_read_only_enabled)?{
????MHA::SlaveUtil::disable_super_read_only($dbh);
??}?else?{
????$log->info("?not?present?or?turned?off,?ignoring.\n");
??}

修改后的代碼??cat $_diff_binary_log?

sub?apply_binlog_to_master($)?{
??my?$target???=?shift;
??my?$err_file?=?"$g_workdir/mysql_from_binlog.err";
??my?$command?=
"mysqlbinlog?$_diff_binary_log?--skip-gtids=true?|?mysql?--binary-mode?--user=$target->{mysql_escaped_user}?--password=$target->{mysql_escaped_password}?--host=$target->{ip}?--port=$target->{port}?-vvv?--unbuffered?>?$err_file?2>&1";

??$log->info("Checking?if?super_read_only?is?defined?and?turned?on..");
??my?($super_read_only_enabled,?$dbh)?=
??????????MHA::SlaveUtil::check_if_super_read_only($target->{hostname},?$target->{ip},?$target->{port},?$target->{user},?$target->{password});
??if?($super_read_only_enabled)?{
????MHA::SlaveUtil::disable_super_read_only($dbh);
??}?else?{
????$log->info("?not?present?or?turned?off,?ignoring.\n");
??}