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PostgresNode: add backup_fs_hot and backup_fs_cold 

These simple methods rely on RecursiveCopy to create a filesystem-level
backup of a server.  They aren't currently used anywhere yet,but will be
useful for future tests.

Author: Craig Ringer
Reviewed-By: Michael Paquier, Salvador Fandino, Álvaro Herrera
Commitfest-URL: https://commitfest.postgresql.org/9/569/
This commit is contained in:
Alvaro Herrera 2016-03-09 19:54:03 -03:00
parent a31aaec406
commit 28f6df3c36
1 changed files with 88 additions and 6 deletions
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94
src/test/perl/PostgresNode.pm
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@ -46,7 +46,14 @@ PostgresNode - class representing PostgreSQL server instance
or print "timed out";
# Do an online pg_basebackup
my $ret = $node->backup('testbackup');
my $ret = $node->backup('testbackup1');
# Take a backup of a running server
my $ret = $node->backup_fs_hot('testbackup2');
# Take a backup of a stopped server
$node->stop;
my $ret = $node->backup_fs_cold('testbackup3')
# Restore it to create a new independent node (not a replica)
my $replica = get_new_node('replica');
@ -448,11 +455,11 @@ sub append_conf
=item $node->backup(backup_name)
Create a hot backup with pg_basebackup in $node->backup_dir,
including the transaction logs. xlogs are fetched at the
end of the backup, not streamed.
Create a hot backup with B<pg_basebackup> in subdirectory B<backup_name> of
B<< $node->backup_dir >>, including the transaction logs. Transaction logs are
fetched at the end of the backup, not streamed.
You'll have to configure a suitable max_wal_senders on the
You'll have to configure a suitable B<max_wal_senders> on the
target server since it isn't done by default.
=cut
@ -464,11 +471,86 @@ sub backup
my $port = $self->port;
my $name = $self->name;
print "# Taking backup $backup_name from node \"$name\"\n";
print "# Taking pg_basebackup $backup_name from node \"$name\"\n";
TestLib::system_or_bail("pg_basebackup -D $backup_path -p $port -x");
print "# Backup finished\n";
}
=item $node->backup_fs_hot(backup_name)
Create a backup with a filesystem level copy in subdirectory B<backup_name> of
B<< $node->backup_dir >>, including transaction logs.
Archiving must be enabled, as B<pg_start_backup()> and B<pg_stop_backup()> are
used. This is not checked or enforced.
The backup name is passed as the backup label to B<pg_start_backup()>.
=cut
sub backup_fs_hot
{
my ($self, $backup_name) = @_;
$self->_backup_fs($backup_name, 1);
}
=item $node->backup_fs_cold(backup_name)
Create a backup with a filesystem level copy in subdirectory B<backup_name> of
B<< $node->backup_dir >>, including transaction logs. The server must be
stopped as no attempt to handle concurrent writes is made.
Use B<backup> or B<backup_fs_hot> if you want to back up a running server.
=cut
sub backup_fs_cold
{
my ($self, $backup_name) = @_;
$self->_backup_fs($backup_name, 0);
}
# Common sub of backup_fs_hot and backup_fs_cold
sub _backup_fs
{
my ($self, $backup_name, $hot) = @_;
my $backup_path = $self->backup_dir . '/' . $backup_name;
my $port = $self->port;
my $name = $self->name;
print "# Taking filesystem backup $backup_name from node \"$name\"\n";
if ($hot)
{
my $stdout = $self->safe_psql('postgres',
"SELECT * FROM pg_start_backup('$backup_name');");
print "# pg_start_backup: $stdout\n";
}
RecursiveCopy::copypath(
$self->data_dir,
$backup_path,
filterfn => sub {
my $src = shift;
return ($src ne 'pg_log' and $src ne 'postmaster.pid');
});
if ($hot)
{
# We ignore pg_stop_backup's return value. We also assume archiving
# is enabled; otherwise the caller will have to copy the remaining
# segments.
my $stdout = $self->safe_psql('postgres',
'SELECT * FROM pg_stop_backup();');
print "# pg_stop_backup: $stdout\n";
}
print "# Backup finished\n";
}
=pod
=item $node->init_from_backup(root_node, backup_name)