diff --git a/doc/source/microversion_testing.rst b/doc/source/microversion_testing.rst
index 7da8ddb..ecf2930 100644
--- a/doc/source/microversion_testing.rst
+++ b/doc/source/microversion_testing.rst
@@ -350,6 +350,10 @@
 
   .. _2.32: https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#id29
 
+  * `2.33`_
+
+  .. _2.33: https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#id30
+
   * `2.36`_
 
   .. _2.36: https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#microversion
diff --git a/releasenotes/notes/set-default-value-of-concurrency-to-2-d916d5c31e3725d5.yaml b/releasenotes/notes/set-default-value-of-concurrency-to-2-d916d5c31e3725d5.yaml
new file mode 100644
index 0000000..0d964a9
--- /dev/null
+++ b/releasenotes/notes/set-default-value-of-concurrency-to-2-d916d5c31e3725d5.yaml
@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    [`bug 1948935 <https://bugs.launchpad.net/tempest/+bug/1948935>`_]
+    The default value of account-generator --concurrency parameter is now
+    set to 2 instead of 1.
diff --git a/tempest/api/compute/admin/test_hypervisor.py b/tempest/api/compute/admin/test_hypervisor.py
index 347193d..c7a1201 100644
--- a/tempest/api/compute/admin/test_hypervisor.py
+++ b/tempest/api/compute/admin/test_hypervisor.py
@@ -145,3 +145,26 @@
         hypers = self.client.search_hypervisor(
             hypers[0]['hypervisor_hostname'])['hypervisors']
         self.assertNotEmpty(hypers, "No hypervisors found.")
+
+
+class HypervisorAdminV253TestBase(base.BaseV2ComputeAdminTest):
+    """Tests Hypervisors API above 2.53 that require admin privileges"""
+
+    min_microversion = '2.53'
+
+    @classmethod
+    def setup_clients(cls):
+        super(HypervisorAdminV253TestBase, cls).setup_clients()
+        cls.client = cls.os_admin.hypervisor_client
+
+    @decorators.idempotent_id('4ab54a14-77a2-4e39-b9d2-1306d157c705')
+    def test_list_show_detail_hypervisors(self):
+        """Verify the list, list details, and show hypevisors
+
+        This verify the Hypervisor API response schema with v2.53 microversion
+        """
+        self.client.list_hypervisors(
+            detail=True, with_servers=True)['hypervisors']
+        hypers = self.client.list_hypervisors(with_servers=True)['hypervisors']
+        self.client.show_hypervisor(
+            hypers[0]['id'], with_servers=True)['hypervisor']
diff --git a/tempest/cmd/account_generator.py b/tempest/cmd/account_generator.py
index 917262e..ad0b547 100755
--- a/tempest/cmd/account_generator.py
+++ b/tempest/cmd/account_generator.py
@@ -81,11 +81,11 @@
   will have the prefix with the given TAG in its name. Using tag is recommended
   for the further using, cleaning resources.
 
-* ``-r, --concurrency CONCURRENCY`` (Optional) Concurrency count
-  (default: 1). The number of accounts required can be estimated as
-  CONCURRENCY x 2. Each user provided in *accounts.yaml* file will be in
-  a different tenant. This is required to provide isolation between test for
-  running in parallel.
+* ``-r, --concurrency CONCURRENCY`` (Optional) Concurrency count (default: 2).
+  The number of accounts generated will be same as CONCURRENCY. The higher the
+  number, the more tests will run in parallel. If you want to run tests
+  sequentially then use 1 as value for concurrency (beware that tests that need
+  more credentials will fail).
 
 * ``--with-admin`` (Optional) Creates admin for each concurrent group
   (default: False).
@@ -236,7 +236,7 @@
                         dest='tag',
                         help='Resources tag')
     parser.add_argument('-r', '--concurrency',
-                        default=1,
+                        default=2,
                         type=positive_int,
                         required=False,
                         dest='concurrency',
diff --git a/tempest/common/compute.py b/tempest/common/compute.py
index a062f6f..2443a67 100644
--- a/tempest/common/compute.py
+++ b/tempest/common/compute.py
@@ -197,6 +197,7 @@
     body = clients.servers_client.create_server(name=name, imageRef=image_id,
                                                 flavorRef=flavor,
                                                 **kwargs)
+    request_id = body.response['x-openstack-request-id']
 
     # handle the case of multiple servers
     if multiple_create_request:
@@ -234,7 +235,8 @@
         for server in servers:
             try:
                 waiters.wait_for_server_status(
-                    clients.servers_client, server['id'], wait_until)
+                    clients.servers_client, server['id'], wait_until,
+                    request_id=request_id)
 
                 # Multiple validatable servers are not supported for now. Their
                 # creation will fail with the condition above.
diff --git a/tempest/common/waiters.py b/tempest/common/waiters.py
index 1b69349..21d0109 100644
--- a/tempest/common/waiters.py
+++ b/tempest/common/waiters.py
@@ -32,7 +32,8 @@
 
 # NOTE(afazekas): This function needs to know a token and a subject.
 def wait_for_server_status(client, server_id, status, ready_wait=True,
-                           extra_timeout=0, raise_on_error=True):
+                           extra_timeout=0, raise_on_error=True,
+                           request_id=None):
     """Waits for a server to reach a given status."""
 
     # NOTE(afazekas): UNKNOWN status possible on ERROR
@@ -71,11 +72,12 @@
                      '/'.join((server_status, str(task_state))),
                      time.time() - start_time)
         if (server_status == 'ERROR') and raise_on_error:
+            details = ''
             if 'fault' in body:
-                raise exceptions.BuildErrorException(body['fault'],
-                                                     server_id=server_id)
-            else:
-                raise exceptions.BuildErrorException(server_id=server_id)
+                details += 'Fault: %s.' % body['fault']
+            if request_id:
+                details += ' Server boot request ID: %s.' % request_id
+            raise exceptions.BuildErrorException(details, server_id=server_id)
 
         timed_out = int(time.time()) - start_time >= timeout
 
@@ -88,6 +90,8 @@
                         'status': status,
                         'expected_task_state': expected_task_state,
                         'timeout': timeout})
+            if request_id:
+                message += ' Server boot request ID: %s.' % request_id
             message += ' Current status: %s.' % server_status
             message += ' Current task state: %s.' % task_state
             caller = test_utils.find_test_caller()
diff --git a/tempest/lib/api_schema/response/compute/v2_33/__init__.py b/tempest/lib/api_schema/response/compute/v2_33/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tempest/lib/api_schema/response/compute/v2_33/__init__.py
diff --git a/tempest/lib/api_schema/response/compute/v2_33/hypervisors.py b/tempest/lib/api_schema/response/compute/v2_33/hypervisors.py
new file mode 100644
index 0000000..9773605
--- /dev/null
+++ b/tempest/lib/api_schema/response/compute/v2_33/hypervisors.py
@@ -0,0 +1,53 @@
+# Copyright 2018 ZTE Corporation.  All rights reserved.
+#
+#    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.
+
+import copy
+
+from tempest.lib.api_schema.response.compute.v2_1 import parameter_types
+from tempest.lib.api_schema.response.compute.v2_28 \
+    import hypervisors as hypervisorsv228
+
+###########################################################################
+#
+# 2.33:
+#
+# hypervisor_links parameter is added to the response body for the following
+# APIs:
+#
+# - GET /os-hypervisors
+# - GET /os-hypervisors/detail
+###########################################################################
+list_search_hypervisors = copy.deepcopy(
+    hypervisorsv228.list_search_hypervisors)
+list_search_hypervisors['response_body']['properties'].update(
+    {'hypervisors_links': parameter_types.links}
+)
+
+list_hypervisors_detail = copy.deepcopy(
+    hypervisorsv228.list_hypervisors_detail)
+list_hypervisors_detail['response_body']['properties'].update(
+    {'hypervisors_links': parameter_types.links}
+)
+
+# NOTE(zhufl): Below are the unchanged schema in this microversion. We need
+# to keep this schema in this file to have the generic way to select the
+# right schema based on self.schema_versions_info mapping in service client.
+# ****** Schemas unchanged since microversion 2.28 ***
+get_hypervisor = copy.deepcopy(hypervisorsv228.get_hypervisor)
+hypervisor_detail = copy.deepcopy(hypervisorsv228.hypervisor_detail)
+get_hypervisor_statistics = \
+    copy.deepcopy(hypervisorsv228.get_hypervisor_statistics)
+get_hypervisor_uptime = copy.deepcopy(hypervisorsv228.get_hypervisor_uptime)
+get_hypervisors_servers = copy.deepcopy(
+    hypervisorsv228.get_hypervisors_servers)
diff --git a/tempest/lib/api_schema/response/compute/v2_53/hypervisors.py b/tempest/lib/api_schema/response/compute/v2_53/hypervisors.py
new file mode 100644
index 0000000..e172f1f
--- /dev/null
+++ b/tempest/lib/api_schema/response/compute/v2_53/hypervisors.py
@@ -0,0 +1,68 @@
+# Copyright 2018 ZTE Corporation.  All rights reserved.
+#
+#    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.
+
+import copy
+
+from tempest.lib.api_schema.response.compute.v2_33 \
+    import hypervisors as hypervisorsv233
+
+###########################################################################
+#
+# 2.53:
+#
+# servers parameter is added to the response body for the following
+# APIs:
+#
+# - GET /os-hypervisor
+# - GET /os-hypervisors
+# - GET /os-hypervisors/detail
+#
+###########################################################################
+
+servers = {
+    'type': 'array',
+    'items': {
+        'type': 'object',
+        'properties': {
+            'uuid': {'type': 'string', 'format': 'uuid'},
+            'name': {'type': 'string'},
+        },
+        'additionalProperties': False,
+    },
+}
+
+hypervisor_detail = copy.deepcopy(hypervisorsv233.hypervisor_detail)
+hypervisor_detail['properties'].update({'servers': servers})
+get_hypervisor = copy.deepcopy(hypervisorsv233.get_hypervisor)
+get_hypervisor['response_body']['properties'].update(
+    {'hypervisor': hypervisor_detail})
+list_hypervisors_detail = copy.deepcopy(
+    hypervisorsv233.list_hypervisors_detail)
+list_hypervisors_detail['response_body']['properties']['hypervisors'].update(
+    {'items': hypervisor_detail})
+
+list_search_hypervisors = copy.deepcopy(
+    hypervisorsv233.list_search_hypervisors)
+list_search_hypervisors['response_body']['properties']['hypervisors'][
+    'items']['properties'].update({'servers': servers})
+
+# NOTE(zhufl): Below are the unchanged schema in this microversion. We need
+# to keep this schema in this file to have the generic way to select the
+# right schema based on self.schema_versions_info mapping in service client.
+# ****** Schemas unchanged since microversion 2.33 ***
+get_hypervisor_statistics = \
+    copy.deepcopy(hypervisorsv233.get_hypervisor_statistics)
+get_hypervisor_uptime = copy.deepcopy(hypervisorsv233.get_hypervisor_uptime)
+get_hypervisors_servers = copy.deepcopy(
+    hypervisorsv233.get_hypervisors_servers)
diff --git a/tempest/lib/common/rest_client.py b/tempest/lib/common/rest_client.py
index 3f735f5..ef14dfc 100644
--- a/tempest/lib/common/rest_client.py
+++ b/tempest/lib/common/rest_client.py
@@ -907,8 +907,8 @@
             if int(time.time()) - start_time >= self.build_timeout:
                 message = ('Failed to delete %(resource_type)s %(id)s within '
                            'the required time (%(timeout)s s). Timer started '
-                           'at %(start_time)s. Timer ended at %(end_time)s'
-                           'waited for %(wait_time)s' %
+                           'at %(start_time)s. Timer ended at %(end_time)s. '
+                           'Waited for %(wait_time)s s.' %
                            {'resource_type': self.resource_type, 'id': id,
                             'timeout': self.build_timeout,
                             'start_time': start_time,
diff --git a/tempest/lib/services/compute/hypervisor_client.py b/tempest/lib/services/compute/hypervisor_client.py
index 1cbfcc3..e237845 100644
--- a/tempest/lib/services/compute/hypervisor_client.py
+++ b/tempest/lib/services/compute/hypervisor_client.py
@@ -13,12 +13,18 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from urllib import parse as urllib
+
 from oslo_serialization import jsonutils as json
 
 from tempest.lib.api_schema.response.compute.v2_1 \
     import hypervisors as schemav21
 from tempest.lib.api_schema.response.compute.v2_28 \
     import hypervisors as schemav228
+from tempest.lib.api_schema.response.compute.v2_33 \
+    import hypervisors as schemav233
+from tempest.lib.api_schema.response.compute.v2_53 \
+    import hypervisors as schemav253
 from tempest.lib.common import rest_client
 from tempest.lib.services.compute import base_compute_client
 
@@ -27,9 +33,11 @@
 
     schema_versions_info = [
         {'min': None, 'max': '2.27', 'schema': schemav21},
-        {'min': '2.28', 'max': None, 'schema': schemav228}]
+        {'min': '2.28', 'max': '2.32', 'schema': schemav228},
+        {'min': '2.33', 'max': '2.52', 'schema': schemav233},
+        {'min': '2.53', 'max': None, 'schema': schemav253}]
 
-    def list_hypervisors(self, detail=False):
+    def list_hypervisors(self, detail=False, **kwargs):
         """List hypervisors information."""
         url = 'os-hypervisors'
         schema = self.get_schema(self.schema_versions_info)
@@ -37,14 +45,19 @@
         if detail:
             url += '/detail'
             _schema = schema.list_hypervisors_detail
+        if kwargs:
+            url += '?%s' % urllib.urlencode(kwargs)
 
         resp, body = self.get(url)
         body = json.loads(body)
         self.validate_response(_schema, resp, body)
         return rest_client.ResponseBody(resp, body)
 
-    def show_hypervisor(self, hypervisor_id):
+    def show_hypervisor(self, hypervisor_id, **kwargs):
         """Display the details of the specified hypervisor."""
+        url = 'os-hypervisors/%s' % hypervisor_id
+        if kwargs:
+            url += '?%s' % urllib.urlencode(kwargs)
         resp, body = self.get('os-hypervisors/%s' % hypervisor_id)
         body = json.loads(body)
         schema = self.get_schema(self.schema_versions_info)