187725fafb
In order to allow replication sets to be all on the same hypervisor (affinity) or all on different hypervisors (anti-affinity) a new argument (locality) needed to be added to the Trove create API. This changeset addresses the Trove server part of this feature. 'locality' can now be added to the ReST payload for a create command and it is passed along as a scheduler hint to Nova. The replication scenario tests were enhanced to test that 'affinity' works and 'anti-affinity' fails (since devstack sets up a single hypervisor by default). A check for the existance (and lack of) server-groups was added. This is to ensure that not only is the server-group created properly, but also that it has been deleted after all the related instances are gone. DocImpact: New functionality Partially implements: blueprint replication-cluster-locality Depends-On: I18f242983775526a7f1e2644302ebdc0dac025cf Change-Id: I7d924c25d832f9ff4386e9497bfd214f1b2b3503
97 lines
3.3 KiB
Python
97 lines
3.3 KiB
Python
# Copyright 2016 Tesora, Inc.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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import six
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from oslo_log import log as logging
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from trove.common import cfg
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from trove.common.i18n import _
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from trove.common.remote import create_nova_client
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CONF = cfg.CONF
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LOG = logging.getLogger(__name__)
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class ServerGroup(object):
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@classmethod
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def load(cls, context, compute_id):
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client = create_nova_client(context)
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server_group = None
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try:
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for sg in client.server_groups.list():
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if compute_id in sg.members:
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server_group = sg
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except Exception:
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LOG.exception(_("Could not load server group for compute %s") %
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compute_id)
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return server_group
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@classmethod
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def create(cls, context, locality, name_suffix):
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client = create_nova_client(context)
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server_group_name = "%s_%s" % ('locality', name_suffix)
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server_group = client.server_groups.create(
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name=server_group_name, policies=[locality])
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LOG.debug("Created '%s' server group called %s (id: %s)." %
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(locality, server_group_name, server_group.id))
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return server_group
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@classmethod
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def delete(cls, context, server_group, force=False):
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# Only delete the server group if we're the last member in it, or if
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# it has no members
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if server_group:
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if force or len(server_group.members) <= 1:
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client = create_nova_client(context)
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client.server_groups.delete(server_group.id)
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LOG.debug("Deleted server group %s." % server_group.id)
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else:
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LOG.debug("Skipping delete of server group %s (members: %s)." %
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(server_group.id, server_group.members))
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@classmethod
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def convert_to_hint(cls, server_group, hints=None):
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if server_group:
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hints = hints or {}
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hints["group"] = server_group.id
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return hints
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@classmethod
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def build_scheduler_hint(cls, context, locality, name_suffix):
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scheduler_hint = None
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if locality:
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# Build the scheduler hint, but only if locality's a string
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if isinstance(locality, six.string_types):
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server_group = cls.create(
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context, locality, name_suffix)
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scheduler_hint = cls.convert_to_hint(
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server_group)
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else:
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# otherwise assume it's already in hint form (i.e. a dict)
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scheduler_hint = locality
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return scheduler_hint
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@classmethod
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def get_locality(cls, server_group):
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locality = None
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if server_group:
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locality = server_group.policies[0]
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return locality
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