diff --git a/nova/api/openstack/placement/lib.py b/nova/api/openstack/placement/lib.py
index ce16ecd24e..58c230db7b 100644
--- a/nova/api/openstack/placement/lib.py
+++ b/nova/api/openstack/placement/lib.py
@@ -37,3 +37,17 @@ class RequestGroup(object):
         self.required_traits = required_traits or set()
         self.forbidden_traits = forbidden_traits or set()
         self.member_of = member_of or []
+
+    def __str__(self):
+        ret = 'RequestGroup(use_same_provider=%s' % str(self.use_same_provider)
+        ret += ', resources={%s}' % ', '.join(
+            '%s:%d' % (rc, amount)
+            for rc, amount in sorted(list(self.resources.items())))
+        ret += ', traits=[%s]' % ', '.join(
+            sorted(self.required_traits) +
+            ['!%s' % ft for ft in self.forbidden_traits])
+        ret += ', aggregates=[%s]' % ', '.join(
+            sorted('[%s]' % ', '.join(agglist)
+                   for agglist in sorted(self.member_of)))
+        ret += ')'
+        return ret
diff --git a/nova/scheduler/client/report.py b/nova/scheduler/client/report.py
index 2b4469eb9d..7f225af785 100644
--- a/nova/scheduler/client/report.py
+++ b/nova/scheduler/client/report.py
@@ -374,18 +374,13 @@ class SchedulerReportClient(object):
                     version)
 
         args = {
-            'resources': res,
+            'resource_request': str(resources),
             'status_code': resp.status_code,
             'err_text': resp.text,
         }
         msg = ("Failed to retrieve allocation candidates from placement "
-               "API for filters %(resources)s, traits %(traits)s, "
-               "aggregates %(aggregates)s. Got "
-               "%(status_code)d: %(err_text)s.")
-        query_traits = [v for k, v in qs_params if k == 'required']
-        query_aggs = [v for k, v in qs_params if k == 'member_of']
-        args['traits'] = query_traits and query_traits[0] or '(none)'
-        args['aggregates'] = ','.join(query_aggs) or '(none)'
+               "API for filters: %(resource_request)s\n"
+               "Got %(status_code)d: %(err_text)s.")
         LOG.error(msg, args)
         return None, None, None
 
diff --git a/nova/scheduler/utils.py b/nova/scheduler/utils.py
index 6a635ffea2..4b16af76cf 100644
--- a/nova/scheduler/utils.py
+++ b/nova/scheduler/utils.py
@@ -57,6 +57,10 @@ class ResourceRequest(object):
         # { ident: RequestGroup }
         self._rg_by_id = {}
 
+    def __str__(self):
+        return ', '.join(sorted(
+            list(str(rg) for rg in list(self._rg_by_id.values()))))
+
     def get_request_group(self, ident):
         if ident not in self._rg_by_id:
             rq_grp = placement_lib.RequestGroup(use_same_provider=bool(ident))
diff --git a/nova/tests/unit/scheduler/test_utils.py b/nova/tests/unit/scheduler/test_utils.py
index 6b22aa810b..a9c321c5a9 100644
--- a/nova/tests/unit/scheduler/test_utils.py
+++ b/nova/tests/unit/scheduler/test_utils.py
@@ -290,6 +290,14 @@ class TestUtils(test.NoDBTestCase):
         self.assertEqual([('foo', 'bar'), ('baz',)],
                          req.get_request_group(None).member_of)
 
+        # Test stringification
+        self.assertEqual(
+            'RequestGroup(use_same_provider=False, '
+            'resources={DISK_GB:1, MEMORY_MB:1024, VCPU:1}, '
+            'traits=[], '
+            'aggregates=[[baz], [foo, bar]])',
+            str(req))
+
     def test_resources_from_request_spec_no_aggregates(self):
         flavor = objects.Flavor(vcpus=1, memory_mb=1024,
                                 root_gb=1, ephemeral_gb=0,
@@ -481,8 +489,28 @@ class TestUtils(test.NoDBTestCase):
                 'DISK_GB': 5,
             }
         )
-        self.assertResourceRequestsEqual(
-            expected, utils.ResourceRequest.from_extra_specs(extra_specs))
+        rr = utils.ResourceRequest.from_extra_specs(extra_specs)
+        self.assertResourceRequestsEqual(expected, rr)
+
+        # Test stringification
+        self.assertEqual(
+            'RequestGroup(use_same_provider=False, '
+            'resources={MEMORY_MB:2048, VCPU:2}, '
+            'traits=[CUSTOM_MAGIC, HW_CPU_X86_AVX, !CUSTOM_BRONZE], '
+            'aggregates=[]), '
+            'RequestGroup(use_same_provider=True, '
+            'resources={DISK_GB:5}, '
+            'traits=[], '
+            'aggregates=[]), '
+            'RequestGroup(use_same_provider=True, '
+            'resources={IPV4_ADDRESS:1, SRIOV_NET_VF:1}, '
+            'traits=[CUSTOM_PHYSNET_NET1, !CUSTOM_PHYSNET_NET2], '
+            'aggregates=[]), '
+            'RequestGroup(use_same_provider=True, '
+            'resources={IPV4_ADDRESS:2, SRIOV_NET_VF:1}, '
+            'traits=[CUSTOM_PHYSNET_NET2, HW_NIC_ACCEL_SSL], '
+            'aggregates=[])',
+            str(rr))
 
     def test_resource_request_from_extra_specs_append_request(self):
         extra_specs = {