Reduce the query time of the instances when call get_instance_list()
The problem is that watcher is passing limit=-1 to novaclient when
listing servers which will always make at least two API calls to be
sure it's done paging:
https://github.com/openstack/python-novaclient/blob/13.0.1/novaclient/v2/servers.py#L896
If we can determine before we list servers that there are only a
certain number where the number of servers is less than 1000. For
example: 4, we should just pass the limit=len(servers) to novaclient
and avoid the second call for paging which takes extra time and
yields no results.
Change-Id: I797ad934a0f8496dbcbf65798e28b0443f238137
Closes-Bug: #1834679
(cherry picked from commit 1e8b17ac46
)
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parent
0f90ad596c
commit
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@ -76,19 +76,25 @@ class NovaHelper(object):
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LOG.exception(exc)
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raise exception.ComputeNodeNotFound(name=node_hostname)
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def get_instance_list(self, filters=None):
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def get_instance_list(self, filters=None, limit=-1):
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"""List servers for all tenants with details.
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This always gets servers with the all_tenants=True filter.
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:param filters: dict of additional filters
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:param filters: dict of additional filters (optional).
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:param limit: Maximum number of servers to return (optional).
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If limit == -1, all servers will be returned,
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note that limit == -1 will have a performance
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penalty. For details, please see:
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https://bugs.launchpad.net/watcher/+bug/1834679
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:returns: list of novaclient Server objects
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"""
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search_opts = {'all_tenants': True}
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if filters:
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search_opts.update(filters)
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# TODO(chenker) Add marker param to list Server objects.
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return self.nova.servers.list(search_opts=search_opts,
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limit=-1)
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limit=limit)
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def get_flavor_list(self):
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return self.nova.flavors.list(**{'is_public': None})
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@ -328,8 +328,18 @@ class ModelBuilder(object):
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return
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host = node.service["host"]
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compute_node = self.model.get_node_by_uuid(host)
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filters = {'host': host}
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limit = len(instances) if len(instances) <= 1000 else -1
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# Get all servers on this compute host.
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instances = self.nova_helper.get_instance_list({'host': host})
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# Note that the advantage of passing the limit parameter is
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# that it can speed up the call time of novaclient. 1000 is
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# the default maximum number of return servers provided by
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# compute API. If we need to request more than 1000 servers,
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# we can set limit=-1. For details, please see:
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# https://bugs.launchpad.net/watcher/+bug/1834679
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instances = self.nova_helper.get_instance_list(
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filters=filters,
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limit=limit)
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for inst in instances:
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# Add Node
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instance = self._build_instance_node(inst)
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@ -106,4 +106,26 @@ class TestNovaClusterDataModelCollector(base.TestCase):
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self.assertEqual(instance.uuid, 'ef500f7e-dac8-470f-960c-169486fce71b')
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m_nova_helper.get_instance_list.assert_called_once_with(
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{'host': fake_compute_node.service['host']})
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filters={'host': fake_compute_node.service['host']}, limit=1)
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class TestModelBuilder(base.TestCase):
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@mock.patch.object(nova_helper, 'NovaHelper', mock.MagicMock())
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def test_add_instance_node(self):
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model_builder = nova.ModelBuilder(osc=mock.MagicMock())
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model_builder.model = mock.MagicMock()
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mock_node = mock.MagicMock()
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mock_host = mock_node.service["host"]
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mock_instances = [mock.MagicMock()]
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model_builder.add_instance_node(mock_node, mock_instances)
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# verify that when len(instances) <= 1000, limit == len(instance).
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model_builder.nova_helper.get_instance_list.assert_called_once_with(
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filters={'host': mock_host}, limit=1)
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# verify that when len(instances) > 1000, limit == -1.
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mock_instance = mock.Mock()
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mock_instances = [mock_instance] * 1001
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model_builder.add_instance_node(mock_node, mock_instances)
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model_builder.nova_helper.get_instance_list.assert_called_with(
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filters={'host': mock_host}, limit=-1)
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