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ServerManager.pm
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ServerManager.pm
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#!/usr/bin/env perl
# Copyright (C) 2011 DeNA Co.,Ltd.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
package MHA::ServerManager;
use strict;
use warnings FATAL => 'all';
use Carp qw(croak);
use English qw(-no_match_vars);
use MHA::SlaveUtil;
use MHA::DBHelper;
use MHA::Server;
use MHA::ManagerConst;
use Parallel::ForkManager;
sub new {
my $class = shift;
my $self = {
servers => [],
dead_servers => [],
alive_servers => [],
alive_slaves => [],
failed_slaves => [],
latest_slaves => [],
oldest_slaves => [],
unmanaged_slaves => [],
orig_master => undef,
new_master => undef,
logger => undef,
@_,
};
return bless $self, $class;
}
sub set_servers($$) {
my $self = shift;
my $servers_ref = shift;
$self->{servers} = $servers_ref;
}
sub set_latest_slaves($$) {
my $self = shift;
my $servers_ref = shift;
$self->{latest_slaves} = $servers_ref;
}
sub set_oldest_slaves($$) {
my $self = shift;
my $servers_ref = shift;
$self->{oldest_slaves} = $servers_ref;
}
sub set_unmanaged_slaves($$) {
my $self = shift;
my $servers_ref = shift;
$self->{unmanaged_slaves} = $servers_ref;
}
sub get_servers($) {
my $self = shift;
return @{ $self->{servers} };
}
sub get_dead_servers($) {
my $self = shift;
return @{ $self->{dead_servers} };
}
sub get_alive_servers($) {
my $self = shift;
return @{ $self->{alive_servers} };
}
sub get_alive_slaves($) {
my $self = shift;
return @{ $self->{alive_slaves} };
}
sub get_failed_slaves($) {
my $self = shift;
return @{ $self->{failed_slaves} };
}
sub get_latest_slaves($) {
my $self = shift;
return @{ $self->{latest_slaves} };
}
sub get_oldest_slaves($) {
my $self = shift;
return @{ $self->{oldest_slaves} };
}
sub get_unmanaged_slaves($) {
my $self = shift;
return @{ $self->{unmanaged_slaves} };
}
sub add_dead_server($$) {
my $self = shift;
my $server = shift;
push @{ $self->{dead_servers} }, $server;
}
sub add_alive_server($$) {
my $self = shift;
my $server = shift;
push @{ $self->{alive_servers} }, $server;
}
sub add_alive_slave($$) {
my $self = shift;
my $server = shift;
push @{ $self->{alive_slaves} }, $server;
}
sub add_failed_slave($$) {
my $self = shift;
my $server = shift;
push @{ $self->{failed_slaves} }, $server;
}
sub add_unmanaged_slave($$) {
my $self = shift;
my $server = shift;
push @{ $self->{unmanaged_slaves} }, $server;
}
sub set_orig_master($$) {
my $self = shift;
my $server = shift;
$self->{orig_master} = $server;
$server->{orig_master} = 1;
}
sub get_orig_master($) {
my $self = shift;
return $self->{orig_master};
}
sub init_servers($) {
my $self = shift;
my $log = $self->{logger};
my @servers = $self->get_servers();
$self->{dead_servers} = [];
$self->{alive_servers} = [];
$self->{alive_slaves} = [];
$self->{failed_slaves} = [];
$self->{unmanaged_slaves} = [];
foreach my $server (@servers) {
if ( $server->{dead} ) {
$self->add_dead_server($server);
}
elsif ( $server->{unmanaged} ) {
$self->add_unmanaged_slave($server);
}
else {
$self->add_alive_server($server);
if ( $server->{not_slave} eq '0' && !$server->{orig_master} ) {
if ( !$server->is_sql_thread_error() && !$server->{lack_relay_log} ) {
$self->add_alive_slave($server);
}
else {
$self->add_failed_slave($server);
}
}
}
}
my @alive_servers = $self->get_alive_servers();
if ( $#alive_servers <= -1 ) {
$log->error("There is no alive server. We can't do failover");
croak;
}
my @alive_slaves = $self->get_alive_slaves();
if ( $#alive_slaves <= -1 ) {
$log->error("There is no alive slave. We can't do failover");
croak;
}
}
sub init_binlog_server {
my $binlog_server_ref = shift;
my $log = shift;
my @binlog_servers = @$binlog_server_ref;
my $num_alive_binlog_servers = 0;
foreach my $server (@binlog_servers) {
unless ( $server->{logger} ) {
$server->{logger} = $log;
}
if (
MHA::HealthCheck::ssh_check_simple(
$server->{ssh_user}, $server->{ssh_host},
$server->{ssh_ip}, $server->{ssh_port},
$server->{logger}, $server->{ssh_connection_timeout}
)
)
{
$log->warning("Failed to SSH to binlog server $server->{hostname}");
$server->{ssh_reachable} = 0;
}
else {
if (
MHA::ManagerUtil::get_node_version(
$server->{logger}, $server->{ssh_user}, $server->{ssh_host},
$server->{ssh_ip}, $server->{ssh_port}
)
)
{
$log->info("Binlog server $server->{hostname} is reachable.");
$server->{ssh_reachable} = 1;
$num_alive_binlog_servers++;
}
else {
$log->warning(
"Failed to get MHA Node version from binlog server $server->{hostname}"
);
$server->{ssh_reachable} = 0;
}
}
}
if ( $#binlog_servers >= 0 && $num_alive_binlog_servers <= 0 ) {
$log->error("Binlog Server is defined but there is no alive server.");
croak;
}
}
sub set_logger($$) {
my $self = shift;
my $logger = shift;
$self->{logger} = $logger;
}
sub connect_all_and_read_server_status($$$$) {
my $self = shift;
my $dead_master_host = shift;
my $dead_master_ip = shift;
my $dead_master_port = shift;
my $log = $self->{logger};
my @servers = $self->get_servers();
$log->debug("Connecting to servers..");
my $should_die = 0;
my $connection_checker = new Parallel::ForkManager( $#servers + 1 );
$connection_checker->run_on_start(
sub {
my ( $pid, $target ) = @_;
}
);
$connection_checker->run_on_finish(
sub {
my ( $pid, $exit_code, $target ) = @_;
if ( $exit_code == $MHA::ManagerConst::MYSQL_DEAD_RC ) {
$target->{dead} = 1;
}
elsif ($exit_code) {
$should_die = 1;
}
}
);
foreach my $target (@servers) {
unless ( $target->{logger} ) {
$target->{logger} = $log;
}
$connection_checker->start($target) and next;
eval {
$SIG{INT} = $SIG{HUP} = $SIG{QUIT} = $SIG{TERM} = "DEFAULT";
if ( $dead_master_host
&& $dead_master_ip
&& $dead_master_port )
{
if (
$target->server_equals(
$dead_master_host, $dead_master_ip, $dead_master_port
)
)
{
$connection_checker->finish($MHA::ManagerConst::MYSQL_DEAD_RC);
}
}
my $rc = $target->connect_check( 2, $log, 1 );
$connection_checker->finish($rc);
};
if ($@) {
$log->error($@);
undef $@;
$connection_checker->finish(1);
}
$connection_checker->finish(0);
}
$connection_checker->wait_all_children;
if ($should_die) {
$log->error("Got fatal error, stopping operations");
croak;
}
foreach my $target (@servers) {
next if ( $target->{dead} );
$target->connect_and_get_status();
}
$self->init_servers();
$self->compare_slave_version();
$log->debug("Connecting to servers done.");
$self->validate_current_master();
$self->{gtid_failover_mode} = $self->get_gtid_status();
$log->info(
sprintf( "GTID failover mode = %d", $self->{gtid_failover_mode} ) );
}
sub get_oldest_version($) {
my $self = shift;
my @servers = $self->get_alive_servers();
my $oldest_version;
foreach my $server (@servers) {
if ( $server->{oldest_major_version} ) {
$oldest_version = $server->{mysql_version};
last;
}
}
return $oldest_version;
}
sub compare_slave_version($) {
my $self = shift;
my @servers = $self->get_alive_servers();
my $log = $self->{logger};
$log->debug(" Comparing MySQL versions..");
my $min_major_version;
foreach (@servers) {
my $dbhelper = $_->{dbhelper};
next if ( $_->{dead} || $_->{not_slave} );
my $parsed_major_version =
MHA::NodeUtil::parse_mysql_major_version( $_->{mysql_version} );
if (!$min_major_version
|| $parsed_major_version < $min_major_version )
{
$min_major_version = $parsed_major_version;
}
}
foreach (@servers) {
my $dbhelper = $_->{dbhelper};
next if ( $_->{dead} || $_->{not_slave} );
my $parsed_major_version =
MHA::NodeUtil::parse_mysql_major_version( $_->{mysql_version} );
if ( $min_major_version == $parsed_major_version ) {
$_->{oldest_major_version} = 1;
}
else {
$_->{oldest_major_version} = 0;
}
}
$log->debug(" Comparing MySQL versions done.");
}
sub print_filter_rules($$) {
my $self = shift;
my $master = shift;
my $log = $self->{logger};
my $msg = "Bad Binlog/Replication filtering rules:\n";
$msg .= $master->print_filter(1) if ( $master && !$master->{dead} );
my @slaves = $self->get_alive_slaves();
foreach my $slave (@slaves) {
$msg .= $slave->print_filter();
}
$log->warning($msg);
}
sub validate_repl_filter($$) {
my $self = shift;
my $master = shift;
my $log = $self->{logger};
$log->info("Checking replication filtering settings..");
my $binlog_do_db;
my $binlog_ignore_db;
# If master is alive
if ( $master && !$master->{dead} ) {
$binlog_do_db = $master->{Binlog_Do_DB};
$binlog_ignore_db = $master->{Binlog_Ignore_DB};
$log->info(
" binlog_do_db= $binlog_do_db, binlog_ignore_db= $binlog_ignore_db");
}
my @slaves = $self->get_alive_slaves();
my $replicate_do_db;
my $replicate_ignore_db;
my $replicate_do_table;
my $replicate_ignore_table;
my $replicate_wild_do_table;
my $replicate_wild_ignore_table;
foreach (@slaves) {
$replicate_do_db = $_->{Replicate_Do_DB} unless ($replicate_do_db);
$replicate_ignore_db = $_->{Replicate_Ignore_DB}
unless ($replicate_ignore_db);
$replicate_do_table = $_->{Replicate_Do_Table} unless ($replicate_do_table);
$replicate_ignore_table = $_->{Replicate_Ignore_Table}
unless ($replicate_ignore_table);
$replicate_wild_do_table = $_->{Replicate_Wild_Do_Table}
unless ($replicate_wild_do_table);
$replicate_wild_ignore_table = $_->{Replicate_Wild_Ignore_Table}
unless ($replicate_wild_ignore_table);
if ( $_->{log_bin} ) {
$binlog_do_db = $_->{Binlog_Do_DB} unless ($binlog_do_db);
$binlog_ignore_db = $_->{Binlog_Ignore_DB} unless ($binlog_ignore_db);
}
if ( $replicate_do_db ne $_->{Replicate_Do_DB}
|| $replicate_ignore_db ne $_->{Replicate_Ignore_DB}
|| $replicate_do_table ne $_->{Replicate_Do_Table}
|| $replicate_ignore_table ne $_->{Replicate_Ignore_Table}
|| $replicate_wild_do_table ne $_->{Replicate_Wild_Do_Table}
|| $replicate_wild_ignore_table ne $_->{Replicate_Wild_Ignore_Table} )
{
$log->error(
sprintf(
"Replication filtering check failed on %s! All slaves must have same replication filtering rules. Check SHOW SLAVE STATUS output and set my.cnf correctly.",
$_->get_hostinfo() )
);
$self->print_filter_rules($master);
return 1;
}
if ( $_->{log_bin} ) {
if ( $binlog_do_db ne $_->{Binlog_Do_DB}
|| $binlog_ignore_db ne $_->{Binlog_Ignore_DB} )
{
$log->error(
sprintf(
"Binlog filtering check failed on %s! All log-bin enabled servers must have same binlog filtering rules (same binlog-do-db and binlog-ignore-db). Check SHOW MASTER STATUS output and set my.cnf correctly.",
$_->get_hostinfo() )
);
$self->print_filter_rules($master);
return 1;
}
}
}
if ( $binlog_do_db && $replicate_do_db ) {
if ( $binlog_do_db ne $replicate_do_db ) {
$log->error(
sprintf(
"binlog_do_db on master(%s) must be the same as replicate_do_db on slaves(%s).",
$binlog_do_db, $replicate_do_db
)
);
$self->print_filter_rules($master);
return 1;
}
}
if ( $binlog_ignore_db && $replicate_ignore_db ) {
if ( $binlog_ignore_db ne $replicate_ignore_db ) {
$log->error(
sprintf(
"binlog_ignore_db on master(%s) must be the same as replicate_ignore_db on slaves(%s).",
$binlog_ignore_db, $replicate_ignore_db
)
);
$self->print_filter_rules($master);
return 1;
}
}
$log->info(" Replication filtering check ok.");
return 0;
}
sub validate_num_alive_servers($$$) {
my $self = shift;
my $current_master = shift;
my $ignore_fail_check = shift;
my $log = $self->{logger};
my @dead_servers = $self->get_dead_servers();
my @failed_slaves = $self->get_failed_slaves();
foreach (@dead_servers) {
next if ( $_->{id} eq $current_master->{id} );
next if ( $ignore_fail_check && $_->{ignore_fail} );
$log->error(
sprintf( " Server %s is dead, but must be alive! Check server settings.",
$_->get_hostinfo() )
);
croak;
}
foreach (@failed_slaves) {
next if ( $ignore_fail_check && $_->{ignore_fail} );
$log->error(
sprintf( " Replication on %s fails! Check server settings.",
$_->get_hostinfo() )
);
croak;
}
return 0;
}
# Check the following
# 1. All slaves are read_only (INFO)
# 2. All slaves see the same master ip/port (ERROR)
# 3. All slaves set relay_log_purge=0 (WARN)
# 4. All slaves have same replication filter rules with a master (ERROR)
# return 0: ok, others: NG
sub validate_slaves($$$) {
my $self = shift;
my $check_repl_filter = shift;
my $master = shift;
my $log = $self->{logger};
my @slaves = $self->get_alive_slaves();
my ( $mip, $mport ) = ();
my $error = 0;
$log->info("Checking slave configurations..");
foreach (@slaves) {
if ( $_->{read_only} ne '1' ) {
$log->info(
sprintf( " read_only=1 is not set on slave %s.\n", $_->get_hostinfo() )
);
}
if ( $_->{relay_purge} ne '0' && !$_->{has_gtid} ) {
$log->warning(
sprintf( " relay_log_purge=0 is not set on slave %s.\n",
$_->get_hostinfo() )
);
}
if ( $_->{log_bin} eq '0' ) {
$log->warning(
sprintf(
" log-bin is not set on slave %s. This host cannot be a master.\n",
$_->get_hostinfo() )
);
}
}
$error = $self->validate_repl_filter($master)
if ($check_repl_filter);
return $error;
}
sub get_alive_server_by_ipport {
my $self = shift;
my $ip = shift;
my $port = shift;
$self->get_server_by_ipport( $ip, $port, 1 );
}
sub get_server_by_ipport {
my $self = shift;
my $ip = shift;
my $port = shift;
my $alive_only = shift;
my @servers;
if ($alive_only) {
@servers = $self->get_alive_servers();
}
else {
@servers = $self->get_servers();
}
foreach (@servers) {
if ( $_->{ip} eq $ip && $_->{port} == $port ) {
return $_;
}
}
return;
}
sub get_alive_server_by_hostport {
my $self = shift;
my $host = shift;
my $port = shift;
my @servers = $self->get_alive_servers();
foreach (@servers) {
if ( $_->{hostname} eq $host && $_->{port} == $port ) {
return $_;
}
}
return;
}
sub get_server_from_by_id {
my $self = shift;
my $servers_ref = shift;
my $id = shift;
my @servers = @$servers_ref;
foreach (@servers) {
if ( $_->{id} eq $id ) {
return $_;
}
}
return;
}
sub get_alive_server_by_id {
my $self = shift;
my $id = shift;
my @alive_servers = $self->get_alive_servers();
foreach (@alive_servers) {
if ( $_->{id} eq $id ) {
return $_;
}
}
return;
}
sub get_alive_slave_by_id {
my $self = shift;
my $id = shift;
my @alive_slaves = $self->get_alive_slaves();
foreach (@alive_slaves) {
if ( $_->{id} eq $id ) {
return $_;
}
}
return;
}
sub get_master_by_slave {
my $self = shift;
my $slave = shift;
return $self->get_server_by_ipport( $slave->{Master_IP},
$slave->{Master_Port} );
}
sub validate_current_master($) {
my $self = shift;
my $log = $self->{logger};
my @alive_servers = $self->get_alive_servers();
my %master_hash;
my $num_slaves = 0;
my $not_slave_servers = 0;
foreach (@alive_servers) {
if ( $_->{not_slave} eq '0' ) {
$master_hash{"$_->{Master_IP}:$_->{Master_Port}"} = $_;
$num_slaves++;
}
else {
$not_slave_servers++;
}
}
if ( $not_slave_servers >= 2 ) {
$log->error(
"There are $not_slave_servers non-slave servers! MHA manages at most one non-slave server. Check configurations."
);
croak;
}
if ( $num_slaves < 1 ) {
$log->error(
"There is not any alive slave! Check slave settings for details.");
croak;
}
# verify masters exist in a config file
my $master;
foreach my $key ( keys(%master_hash) ) {
my $slave = $master_hash{$key};
$master = $self->get_master_by_slave($slave);
unless ($master) {
$log->error(
sprintf(
"Master %s:%d from which slave %s replicates is not defined in the configuration file!",
$slave->{Master_IP}, $slave->{Master_Port},
$slave->get_hostinfo()
)
);
croak;
}
}
my $real_master;
if ( keys(%master_hash) >= 2 ) {
$real_master = $self->get_primary_master( \%master_hash );
}
else {
$real_master = $master;
$self->set_orig_master($real_master);
}
$self->validate_master_ip_port($real_master);
return $real_master;
}
sub validate_master_ip_port {
my $self = shift;
my $real_master = shift;
my $log = $self->{logger};
my $has_unmanaged_slaves = 0;
my @alive_servers = $self->get_alive_servers();
foreach my $slave (@alive_servers) {
next if ( $slave->{id} eq $real_master->{id} );
unless ( $self->get_alive_slave_by_id( $slave->{id} ) ) {
$log->error(
sprintf( "Server %s is alive, but does not work as a slave!",
$slave->get_hostinfo() )
);
croak;
}
if (
!(
( $slave->{Master_IP} eq $real_master->{ip} )
&& ( $slave->{Master_Port} == $real_master->{port} )
)
)
{
if ( $slave->{multi_tier_slave} ) {
$slave->{unmanaged} = 1;
$has_unmanaged_slaves = 1;
}
else {
my $msg = sprintf(
"Slave %s replicates from %s:%d, but real master is %s!",
$slave->get_hostinfo(), $slave->{Master_Host},
$slave->{Master_Port}, $real_master->get_hostinfo()
);
$log->error($msg);
croak;
}
}
}
if ($has_unmanaged_slaves) {
$self->init_servers();
}
}
sub get_multi_master_print_info {
my $self = shift;
my $master_hash_ref = shift;
my %master_hash = %$master_hash_ref;
my $str = "";
foreach my $key ( keys(%master_hash) ) {
my $slave = $master_hash{$key};
my $master = $self->get_master_by_slave($slave);
$str .= "Master " . $master->get_hostinfo();
$str .=
", replicating from $master->{Master_Host}($master->{Master_IP}:$master->{Master_Port})"
if ( $master->{Master_Host} );
$str .= ", read-only" if ( $master->{read_only} );
$str .= ", dead" if ( $master->{dead} );
$str .= "\n";
}
$str .= "\n";
return $str;
}
sub get_primary_master {
my $self = shift;
my $master_hash_ref = shift;
my $log = $self->{logger};
my @alive_servers = $self->get_alive_servers();
my %master_hash = %$master_hash_ref;
my $num_real_masters = 0;
my $real_master;
foreach my $key ( keys(%master_hash) ) {
my $slave = $master_hash{$key};
my $master = $self->get_master_by_slave($slave);
next if ( !$master->{dead} && $master->{read_only} );
$real_master = $master;
$num_real_masters++;
}
if ( $num_real_masters < 1 ) {
$log->error(
sprintf(
"Multi-master configuration is detected, but all of them are read-only! Check configurations for details. Master configurations are as below: \n%s",
$self->get_multi_master_print_info($master_hash_ref) )
);
croak;
}
elsif ( $num_real_masters >= 2 ) {
$log->error(
sprintf(
"Multi-master configuration is detected, but two or more masters are either writable (read-only is not set) or dead! Check configurations for details. Master configurations are as below: \n%s",
$self->get_multi_master_print_info($master_hash_ref) )
);
croak;
}
else {
$self->set_orig_master($real_master);
$log->info(
sprintf(
"Multi-master configuration is detected. Current primary(writable) master is %s",
$real_master->get_hostinfo() )
);
$log->info(
sprintf( "Master configurations are as below: \n%s",
$self->get_multi_master_print_info($master_hash_ref) )
);
$self->init_servers();
}
return $real_master;
}
sub get_candidate_masters($) {
my $self = shift;
my $log = $self->{logger};
my @servers = $self->get_servers();
my @ret_servers = ();
foreach (@servers) {
next if ( $_->{dead} eq '1' );
if ( $_->{candidate_master} >= 1 ) {
push( @ret_servers, $_ );
}
}
return @ret_servers;
}
sub print_dead_servers {
my $self = shift;
$self->print_servers( $self->{dead_servers} );
}
sub print_alive_servers {
my $self = shift;
my $log = $self->{logger};
my @alive_servers = $self->get_alive_servers();
foreach (@alive_servers) {
$log->info( " " . $_->get_hostinfo() );
}
}
sub print_alive_slaves {
my $self = shift;
$self->print_servers( $self->{alive_slaves} );
}
sub print_latest_slaves {
my $self = shift;
$self->print_servers( $self->{latest_slaves} );
}
sub print_oldest_slaves {
my $self = shift;
$self->print_servers( $self->{oldest_slaves} );
}
sub print_failed_slaves_if {
my $self = shift;
my $log = $self->{logger};
my @failed_slaves = $self->get_failed_slaves();
if ( $#failed_slaves >= 0 ) {
$log->info("Failed Slaves:");
$self->print_servers( $self->{failed_slaves} );
}
}
sub print_unmanaged_slaves_if {
my $self = shift;
my $log = $self->{logger};
my @unmanaged_slaves = $self->get_unmanaged_slaves();
if ( $#unmanaged_slaves >= 0 ) {
$log->info("Unmanaged Servers:");
$self->print_servers( $self->{unmanaged_slaves} );
}
}
sub print_servers {
my ( $self, $servers_ref ) = @_;
my @servers = @$servers_ref;
foreach (@servers) {
$_->print_server();
}
}
sub disconnect_all($) {
my $self = shift;
my $log = $self->{logger};
my @servers = $self->get_alive_servers();
foreach (@servers) {
$_->disconnect();
}
}
# Check master is not reachable from all alive slaves
# prerequisite: all slaves see the same master
# return 0;ok 1: running
sub is_master_reachable_from_slaves($$) {
my $self = shift;
my $slaves_ref = shift;
my $log = $self->{logger};
my @slaves = $self->get_alive_slaves();
$log->info("Checking the current master is not reachable from all slaves..");
foreach (@slaves) {
my $dbhelper = $_->{dbhelper};
$dbhelper->stop_io_thread();
$dbhelper->start_io_thread();
sleep(3);
my %status = $dbhelper->check_slave_status();
if ( $status{Status} ne '0' || !defined( $status{Slave_IO_Running} ) ) {
$log->error(
sprintf( "Got error when stopping/starting io thread on %s",
$_->get_hostinfo() )
);
return 1;
}
if ( $status{Slave_IO_Running} eq "Yes" ) {
$log->warning(
sprintf( "Master is reachable from slave %s", $_->get_hostinfo() ) );
return 1;
}
$dbhelper->stop_io_thread();
$log->info(
sprintf( " Master is not reachable from slave %s", $_->get_hostinfo() ) );
}
$log->info(" done.");
return 0;
}
# checking slave status again before starting main operations.
# alive slaves info was already fetched by connect_all_and_read_server_status,
# so check_slave_status should not fail here. If it fails, we die here.
sub read_slave_status($) {
my $self = shift;
my $log = $self->{logger};
my @slaves = $self->get_alive_slaves();
$log->debug("Fetching current slave status..");
foreach (@slaves) {
my $dbhelper = $_->{dbhelper};
my ($sstatus) = ();
my %status = $dbhelper->check_slave_status();
# This should not happen so die if it happens
if ( $status{Status} ) {
my $msg = "Checking slave status failed.";
$msg .= " err=$status{Errstr}" if ( $status{Errstr} );
$log->error($msg);
croak;
}
$_->{latest} = 0;
$_->{Master_Log_File} = $status{Master_Log_File};
$_->{Read_Master_Log_Pos} = $status{Read_Master_Log_Pos};
$_->{Relay_Master_Log_File} = $status{Relay_Master_Log_File};
$_->{Exec_Master_Log_Pos} = $status{Exec_Master_Log_Pos};
$_->{Relay_Log_File} = $status{Relay_Log_File};
$_->{Relay_Log_Pos} = $status{Relay_Log_Pos};
$_->{Retrieved_Gtid_Set} = $status{Retrieved_Gtid_Set};
$_->{Executed_Gtid_Set} = $status{Executed_Gtid_Set};
}
$log->debug(" Fetching current slave status done.");
}
sub start_sql_threads_if($) {
my $self = shift;
my @slaves = $self->get_alive_slaves();
foreach my $slave (@slaves) {
$slave->start_sql_thread_if();
}
}
sub get_failover_advisory_locks($) {
my $self = shift;
my $log = $self->{logger};
my @slaves = $self->get_alive_slaves();
foreach my $slave (@slaves) {
if ( $slave->get_failover_advisory_lock() ) {
$log->error(
sprintf(
"Getting advisory lock failed on %s. Maybe failover script or purge_relay_logs script is running on the same slave?",
$slave->get_hostinfo() )
);
croak;
}
}
}
sub identify_latest_slaves($$) {
my $self = shift;
my $find_oldest = shift;
$find_oldest = 0 unless ($find_oldest);
my $log = $self->{logger};
my @slaves = $self->get_alive_slaves();
my @latest = ();
foreach (@slaves) {
my $a = $latest[0]{Master_Log_File};
my $b = $latest[0]{Read_Master_Log_Pos};
if (
!$find_oldest
&& (
( !$a && !defined($b) )
|| ( $_->{Master_Log_File} gt $latest[0]{Master_Log_File} )
|| ( ( $_->{Master_Log_File} ge $latest[0]{Master_Log_File} )
&& $_->{Read_Master_Log_Pos} > $latest[0]{Read_Master_Log_Pos} )
)
)
{
@latest = ();
push( @latest, $_ );
}