Fix the problem of dropping data in mha 0.58 gtid mode

Problem description:

In gtid mode, mha fails over. If the Linux host is still alive, it will not compare master logs and obtain differential logs, which may lead to data loss.

Problem fix:

Find the MasterFailover.pm file, which will follow! Remove

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);}

The removed code

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);}

Find the location defined by the apply_binlog_to_master function

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");}

Modified code 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");}