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# Copyright [2015] Hewlett-Packard Development Company, L.P.
# 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 oslo_log import log as logging
from trove.cluster import models
from trove.cluster.tasks import ClusterTasks
from trove.cluster.views import ClusterView
from trove.common import cfg
from trove.common import exception
from trove.common import server_group as srv_grp
from trove.common.strategies.cluster import base
from trove.common import utils
from trove.extensions.mgmt.clusters.views import MgmtClusterView
from trove.instance import models as inst_models
from trove.quota.quota import check_quotas
from trove.taskmanager import api as task_api
LOG = logging.getLogger(__name__)
CONF = cfg.CONF
class VerticaAPIStrategy(base.BaseAPIStrategy):
@property
def cluster_class(self):
return VerticaCluster
def _action_grow(self, cluster, body):
nodes = body['grow']
instances = []
for node in nodes:
instance = {
'flavor_id': utils.get_id_from_href(node['flavorRef'])
}
if 'name' in node:
instance['name'] = node['name']
if 'volume' in node:
instance['volume_size'] = int(node['volume']['size'])
instances.append(instance)
return cluster.grow(instances)
def _action_shrink(self, cluster, body):
nodes = body['shrink']
instance_ids = [node['id'] for node in nodes]
return cluster.shrink(instance_ids)
@property
def cluster_view_class(self):
return VerticaClusterView
@property
def mgmt_cluster_view_class(self):
return VerticaMgmtClusterView
class VerticaCluster(models.Cluster):
@staticmethod
def _create_instances(context, db_info, datastore, datastore_version,
instances, extended_properties, locality,
new_cluster=True):
vertica_conf = CONF.get(datastore_version.manager)
num_instances = len(instances)
existing = inst_models.DBInstance.find_all(cluster_id=db_info.id).all()
num_existing = len(existing)
# Matching number of instances with configured cluster_member_count
if (new_cluster and
num_instances != vertica_conf.cluster_member_count):
raise exception.ClusterNumInstancesNotSupported(
num_instances=vertica_conf.cluster_member_count)
models.validate_instance_flavors(
context, instances, vertica_conf.volume_support,
vertica_conf.device_path)
req_volume_size = models.get_required_volume_size(
instances, vertica_conf.volume_support)
models.assert_homogeneous_cluster(instances)
deltas = {'instances': num_instances, 'volumes': req_volume_size}
check_quotas(context.tenant, deltas)
flavor_id = instances[0]['flavor_id']
volume_size = instances[0].get('volume_size', None)
nics = [instance.get('nics', None) for instance in instances]
azs = [instance.get('availability_zone', None)
for instance in instances]
regions = [instance.get('region_name', None)
for instance in instances]
# Creating member instances
minstances = []
for i in range(0, num_instances):
if i == 0 and new_cluster:
member_config = {"id": db_info.id, "instance_type": "master"}
else:
member_config = {"id": db_info.id, "instance_type": "member"}
instance_name = "%s-member-%s" % (db_info.name,
str(i + num_existing + 1))
minstances.append(
inst_models.Instance.create(
context, instance_name, flavor_id,
datastore_version.image_id, [], [], datastore,
datastore_version, volume_size, None,
nics=nics[i], availability_zone=azs[i],
configuration_id=None, cluster_config=member_config,
modules=instances[i].get('modules'), locality=locality,
region_name=regions[i])
)
return minstances
@classmethod
def create(cls, context, name, datastore, datastore_version,
instances, extended_properties, locality):
LOG.debug("Initiating cluster creation.")
vertica_conf = CONF.get(datastore_version.manager)
num_instances = len(instances)
# Matching number of instances with configured cluster_member_count
if num_instances != vertica_conf.cluster_member_count:
raise exception.ClusterNumInstancesNotSupported(
num_instances=vertica_conf.cluster_member_count)
db_info = models.DBCluster.create(
name=name, tenant_id=context.tenant,
datastore_version_id=datastore_version.id,
task_status=ClusterTasks.BUILDING_INITIAL)
cls._create_instances(context, db_info, datastore, datastore_version,
instances, extended_properties, locality,
new_cluster=True)
# Calling taskmanager to further proceed for cluster-configuration
task_api.load(context, datastore_version.manager).create_cluster(
db_info.id)
return VerticaCluster(context, db_info, datastore, datastore_version)
@staticmethod
def k_safety(n):
"""
Vertica defines k-safety values of 0, 1 or 2:
https://my.vertica.com/docs/7.1.x/HTML/Content/Authoring/Glossary/
K-Safety.htm
"""
if n < 3:
return 0
elif n < 5:
return 1
else:
return 2
def grow(self, instances):
LOG.debug("Growing cluster.")
self.validate_cluster_available()
context = self.context
db_info = self.db_info
datastore = self.ds
datastore_version = self.ds_version
db_info.update(task_status=ClusterTasks.GROWING_CLUSTER)
locality = srv_grp.ServerGroup.convert_to_hint(self.server_group)
new_instances = self._create_instances(context, db_info, datastore,
datastore_version, instances,
None, locality,
new_cluster=False)
task_api.load(context, datastore_version.manager).grow_cluster(
db_info.id, [instance.id for instance in new_instances])
return VerticaCluster(context, db_info, datastore, datastore_version)
def shrink(self, instance_ids):
self.validate_cluster_available()
context = self.context
db_info = self.db_info
datastore_version = self.ds_version
for db_instance in self.db_instances:
if db_instance.type == 'master':
if db_instance.id in instance_ids:
raise exception.ClusterShrinkInstanceInUse(
id=db_instance.id,
reason="Cannot remove master node."
)
all_instance_ids = [db_instance.id for db_instance
in self.db_instances]
left_instances = [instance_id for instance_id
in all_instance_ids
if instance_id not in instance_ids]
k = self.k_safety(len(left_instances))
vertica_conf = CONF.get(datastore_version.manager)
if k < vertica_conf.min_ksafety:
raise exception.ClusterNumInstancesBelowSafetyThreshold()
db_info.update(task_status=ClusterTasks.SHRINKING_CLUSTER)
task_api.load(context, datastore_version.manager).shrink_cluster(
self.db_info.id, instance_ids)
return VerticaCluster(self.context, db_info,
self.ds, self.ds_version)
class VerticaClusterView(ClusterView):
def build_instances(self):
return self._build_instances(['member', 'master'],
['member', 'master'])
class VerticaMgmtClusterView(MgmtClusterView):
def build_instances(self):
return self._build_instances(['member', 'master'],
['member', 'master'])
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