Remove support for deprecated driver import

Support for specifying the scheduler driver via a full classpath was
deprecated in Mitaka, and with this patch is removed in Ocata.

Change-Id: I72e392aafa886ba19c874f1e0a0c95f6d1757ab9

nova/scheduler/manager.py

@@ -23,12 +23,10 @@ from oslo_log import log as logging
 import oslo_messaging as messaging
 from oslo_serialization import jsonutils
 from oslo_service import periodic_task
-from oslo_utils import importutils
 from stevedore import driver
 
 import nova.conf
 from nova import exception
-from nova.i18n import _, _LW
 from nova import manager
 from nova import objects
 from nova import quota
@@ -51,28 +49,10 @@ class SchedulerManager(manager.Manager):
     def __init__(self, scheduler_driver=None, *args, **kwargs):
         if not scheduler_driver:
             scheduler_driver = CONF.scheduler_driver
-        try:
         self.driver = driver.DriverManager(
                 "nova.scheduler.driver",
                 scheduler_driver,
                 invoke_on_load=True).driver
-        # TODO(Yingxin): Change to catch stevedore.exceptions.NoMatches after
-        # stevedore v1.9.0
-        except RuntimeError:
-            # NOTE(Yingxin): Loading full class path is deprecated and should
-            # be removed in the N release.
-            try:
-                self.driver = importutils.import_object(scheduler_driver)
-                LOG.warning(_LW("DEPRECATED: scheduler_driver uses "
-                                "classloader to load %(path)s. This legacy "
-                                "loading style will be removed in the "
-                                "N release."),
-                            {'path': scheduler_driver})
-            except (ImportError, ValueError):
-                raise RuntimeError(
-                        _("Cannot load scheduler driver from configuration "
-                          "%(conf)s."),
-                        {'conf': scheduler_driver})
         super(SchedulerManager, self).__init__(service_name='scheduler',
                                                *args, **kwargs)
 

nova/tests/functional/notification_sample_tests/notification_sample_base.py

@@ -69,7 +69,7 @@ class NotificationSampleTestBase(test.TestCase,
 
         self.useFixture(utils_fixture.TimeFixture(test_services.fake_utcnow()))
 
-        self.flags(scheduler_driver='nova.scheduler.chance.ChanceScheduler')
+        self.flags(scheduler_driver='chance_scheduler')
         # the image fake backend needed for image discovery
         nova.tests.unit.image.fake.stub_out_image_service(self)
         self.addCleanup(nova.tests.unit.image.fake.FakeImageService_reset)

nova/tests/unit/scheduler/test_scheduler.py

@@ -71,23 +71,6 @@ class SchedulerManagerInitTestCase(test.NoDBTestCase):
         self.flags(scheduler_driver='nonexist_scheduler')
         self.assertRaises(RuntimeError, self.manager_cls)
 
-    # NOTE(Yingxin): Loading full class path is deprecated and should be
-    # removed in the N release.
-    @mock.patch.object(manager.LOG, 'warning')
-    @mock.patch.object(host_manager.HostManager, '_init_instance_info')
-    @mock.patch.object(host_manager.HostManager, '_init_aggregates')
-    def test_init_using_classpath_to_schedulerdriver(self,
-                                                     mock_init_agg,
-                                                     mock_init_inst,
-                                                     mock_warning):
-        self.flags(
-            scheduler_driver=
-            'nova.scheduler.chance.ChanceScheduler')
-        driver = self.manager_cls().driver
-        self.assertIsInstance(driver, chance.ChanceScheduler)
-        warn_args, kwargs = mock_warning.call_args
-        self.assertIn("DEPRECATED", warn_args[0])
-
 
 class SchedulerManagerTestCase(test.NoDBTestCase):
     """Test case for scheduler manager."""

releasenotes/notes/sched_remove_classpath_import-5d0f48eb388e6948.yaml

@@ -0,0 +1,6 @@
+---
+upgrades:
+  - The ability to specify the scheduler driver via a full class path was
+    deprecated in Mitaka, and has now been removed. Drivers must now be listed
+    as one of the entrypoints under the namespace 'nova.scheduler.driver' of
+    the 'setup.cfg' file.