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Support new replicas without the master.

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The replication method should have no_master flag set and
support getting the base backup from some external storage
(i.e. S3). At the moment we only support initialization of
replicas in the already existing cluster when no master is
present, since there is no 'one fits all' way to decide whether
to run initidb or wait for the replica data storage to become
available when dealing with the new cluster.
This commit is contained in:
Oleksii Kliukin
2016-01-26 15:24:32 +01:00
parent c650dc092e
commit 15bec1e28c
6 changed files with 111 additions and 35 deletions
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tests/test_postgresql.py
+22 -1
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@@ -259,6 +259,8 @@ class TestPostgresql(unittest.TestCase):
self.p.follow(self.leader, recovery=True)
self.p.rewind.return_value = False
self.p.follow(self.leader, recovery=True)
with mock.patch('patroni.postgresql.Postgresql.check_recovery_conf', MagicMock(return_value=True)):
self.assertTrue(self.p.follow(None))
def test_can_rewind(self):
tmp = self.p.pg_rewind
@@ -305,6 +307,9 @@ class TestPostgresql(unittest.TestCase):
self.p.query = Mock(side_effect=psycopg2.OperationalError)
self.p.schedule_load_slots = True
self.p.sync_replication_slots(cluster)
self.p.schedule_load_slots = False
with mock.patch('patroni.postgresql.Postgresql.role', new_callable=PropertyMock(return_value='replica')):
self.p.sync_replication_slots(cluster)
@patch.object(MockConnect, 'closed', 2)
def test__query(self):
@@ -364,7 +369,8 @@ class TestPostgresql(unittest.TestCase):
with patch('subprocess.call', Mock(return_value=1)):
self.assertRaises(PostgresException, self.p.bootstrap)
self.p.bootstrap()
self.p.bootstrap(self.leader)
with patch('patroni.postgresql.Postgresql.sync_from_leader', MagicMock(return_value=True)):
self.p.bootstrap(self.leader)
def test_remove_data_directory(self):
self.p.data_dir = 'data_dir'
@@ -478,3 +484,18 @@ class TestPostgresql(unittest.TestCase):
def test_restore_configuration_files(self, mock_copy):
shutil.copy = mock_copy
self.p.restore_configuration_files()
def test_can_create_replica_without_leader(self):
self.p.config['create_replica_method'] = []
self.assertFalse(self.p.can_create_replica_without_leader())
self.p.config['create_replica_method'] = ['wale', 'basebackup']
self.p.config['wale'] = {'command': 'foo', 'no_master': 1}
self.assertTrue(self.p.can_create_replica_without_leader())
def test_replica_method_can_work_without_leader(self):
self.assertFalse(self.p.replica_method_can_work_without_leader('basebackup'))
self.assertFalse(self.p.replica_method_can_work_without_leader('foobar'))
self.p.config['foo'] = {'command': 'bar', 'no_master': 1}
self.assertTrue(self.p.replica_method_can_work_without_leader('foo'))
self.p.config['foo'] = {'command': 'bar'}
self.assertFalse(self.p.replica_method_can_work_without_leader('foo'))