diff --git a/nova/objects/request_spec.py b/nova/objects/request_spec.py
index f8f0edc860e1..2296d4979fc4 100644
--- a/nova/objects/request_spec.py
+++ b/nova/objects/request_spec.py
@@ -320,7 +320,8 @@ class RequestSpec(base.NovaObject):
         # the existing dictionary as a primitive.
         return {'group_updated': True,
                 'group_hosts': set(self.instance_group.hosts),
-                'group_policies': set(self.instance_group.policies)}
+                'group_policies': set(self.instance_group.policies),
+                'group_members': set(self.instance_group.members)}
 
     def to_legacy_request_spec_dict(self):
         """Returns a legacy request_spec dict from the RequestSpec object.
diff --git a/nova/tests/functional/regressions/test_bug_1719730.py b/nova/tests/functional/regressions/test_bug_1719730.py
new file mode 100644
index 000000000000..625949148033
--- /dev/null
+++ b/nova/tests/functional/regressions/test_bug_1719730.py
@@ -0,0 +1,117 @@
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from nova import exception
+from nova import test
+from nova.tests import fixtures as nova_fixtures
+from nova.tests.functional import integrated_helpers
+from nova.tests.unit import fake_network
+import nova.tests.unit.image.fake
+from nova.tests.unit import policy_fixture
+from nova.virt import fake
+
+
+class TestRescheduleWithServerGroup(test.TestCase,
+                                    integrated_helpers.InstanceHelperMixin):
+    """This tests a regression introduced in the Pike release.
+
+    In Pike we converted the affinity filter code to use the RequestSpec object
+    instead of legacy dicts. The filter used to populate server group info in
+    the filter_properties and the conversion removed that. However, in the
+    conductor, we are still converting RequestSpec back and forth between
+    object and primitive, and there is a mismatch between the keys being
+    set/get in filter_properties. So during a reschedule with a server group,
+    we hit an exception "'NoneType' object is not iterable" in the
+    RequestSpec.from_primitives method and the reschedule fails.
+    """
+    def setUp(self):
+        super(TestRescheduleWithServerGroup, self).setUp()
+
+        self.useFixture(policy_fixture.RealPolicyFixture())
+
+        # The NeutronFixture is needed to stub out validate_networks in API.
+        self.useFixture(nova_fixtures.NeutronFixture(self))
+
+        # This stubs out the network allocation in compute.
+        fake_network.set_stub_network_methods(self)
+
+        # We need the computes reporting into placement for the filter
+        # scheduler to pick a host.
+        self.useFixture(nova_fixtures.PlacementFixture())
+
+        api_fixture = self.useFixture(nova_fixtures.OSAPIFixture(
+            api_version='v2.1'))
+        self.api = api_fixture.api
+        # The admin API is used to get the server details to verify the
+        # host on which the server was built.
+        self.admin_api = api_fixture.admin_api
+
+        # 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)
+
+        self.start_service('conductor')
+        self.start_service('scheduler')
+
+        # We start two compute services because we're going to fake one raising
+        # RescheduledException to trigger a retry to the other compute host.
+        fake.set_nodes(['host1'])
+        self.addCleanup(fake.restore_nodes)
+        self.start_service('compute', host='host1')
+        fake.set_nodes(['host2'])
+        self.addCleanup(fake.restore_nodes)
+        self.start_service('compute', host='host2')
+
+        self.image_id = self.api.get_images()[0]['id']
+        self.flavor_id = self.api.get_flavors()[0]['id']
+
+        # This is our flag that we set when we hit the first host and
+        # made it fail.
+        self.failed_host = None
+        self.attempts = 0
+
+        def fake_validate_instance_group_policy(_self, *args, **kwargs):
+            self.attempts += 1
+            if self.failed_host is None:
+                # Set the failed_host value to the ComputeManager.host value.
+                self.failed_host = _self.host
+                raise exception.RescheduledException(instance_uuid='fake',
+                                                     reason='Policy violated')
+
+        self.stub_out('nova.compute.manager.ComputeManager.'
+                      '_validate_instance_group_policy',
+                      fake_validate_instance_group_policy)
+
+    def test_reschedule_with_server_group(self):
+        """Tests the reschedule with server group when one compute host fails.
+
+        This tests the scenario where we have two compute services and try to
+        build a single server. The test is setup such that the scheduler picks
+        the first host which we mock out to fail the late affinity check. This
+        should then trigger a retry on the second host.
+        """
+        group = {'name': 'a-name', 'policies': ['affinity']}
+        created_group = self.api.post_server_groups(group)
+
+        server = {'name': 'retry-with-server-group',
+                  'imageRef': self.image_id,
+                  'flavorRef': self.flavor_id}
+        hints = {'group': created_group['id']}
+        created_server = self.api.post_server({'server': server,
+                                               'os:scheduler_hints': hints})
+        found_server = self._wait_for_state_change(self.admin_api,
+                                                   created_server, 'ACTIVE')
+        # Assert that the host is not the failed host.
+        self.assertNotEqual(self.failed_host,
+                            found_server['OS-EXT-SRV-ATTR:host'])
+        # Assert that we retried.
+        self.assertEqual(2, self.attempts)
diff --git a/nova/tests/unit/objects/test_request_spec.py b/nova/tests/unit/objects/test_request_spec.py
index 1cb3273ed321..efe887fb4d5b 100644
--- a/nova/tests/unit/objects/test_request_spec.py
+++ b/nova/tests/unit/objects/test_request_spec.py
@@ -447,7 +447,8 @@ class _TestRequestSpecObject(object):
                                            disk_gb=10.0,
                                            memory_mb=8192.0),
             instance_group=objects.InstanceGroup(hosts=['fake1'],
-                                                 policies=['affinity']),
+                                                 policies=['affinity'],
+                                                 members=['inst1', 'inst2']),
             scheduler_hints={'foo': ['bar']})
         expected = {'ignore_hosts': ['ignoredhost'],
                     'force_hosts': ['fakehost'],
@@ -461,6 +462,7 @@ class _TestRequestSpecObject(object):
                     'group_updated': True,
                     'group_hosts': set(['fake1']),
                     'group_policies': set(['affinity']),
+                    'group_members': set(['inst1', 'inst2']),
                     'scheduler_hints': {'foo': 'bar'}}
         self.assertEqual(expected, spec.to_legacy_filter_properties_dict())