def test_mit_db(self):
"Test mit_db functions"
print ""
mit_db = MITDBService(config=self.config)
query = "SELECT SiteName FROM Sites WHERE SiteName=%s"
values = ['T2_US_Nebraska']
expected = 'T2_US_Nebraska'
json_data = mit_db.fetch(query=query, values=values, cache=False)
result = json_data['data'][0][0]
self.assertEqual(result, expected)
def __init__(self, config=dict()):
self.logger = logging.getLogger(__name__)
self.config = config
self.phedex = PhEDExService(self.config)
self.mit_db = MITDBService(self.config)
self.datasets = DatasetManager(self.config)
self.sites = SiteManager(self.config)
self.storage = StorageManager(self.config)
self.rankings = DeltaRanking(self.config)
self.max_gb = int(self.config['rocker_board']['max_gb'])
self.min_rank = float(self.config['rocker_board']['min_rank'])
class RockerBoard(object):
"""
RockerBoard is a system balancing algorithm using popularity metrics to predict popularity
and make appropriate replications to keep the system balanced
"""
def __init__(self, config=dict()):
self.logger = logging.getLogger(__name__)
self.config = config
self.phedex = PhEDExService(self.config)
self.mit_db = MITDBService(self.config)
self.datasets = DatasetManager(self.config)
self.sites = SiteManager(self.config)
self.storage = StorageManager(self.config)
self.rankings = DeltaRanking(self.config)
self.max_gb = int(self.config['rocker_board']['max_gb'])
self.min_rank = float(self.config['rocker_board']['min_rank'])
def start(self):
"""
Begin Rocker Board Algorithm
"""
t1 = datetime.datetime.utcnow()
subscriptions = self.balance()
for subscription in subscriptions:
self.logger.info('site: %s\tdataset: %s', subscription[1], subscription[0])
self.subscribe(subscriptions)
t2 = datetime.datetime.utcnow()
td = t2 - t1
self.logger.info('Rocker Board took %s', str(td))
def balance(self):
"""
Balance system by creating new replicas based on popularity
"""
subscriptions = list()
dataset_rankings = self.rankings.dataset_rankings()
site_rankings = self.rankings.site_rankings()
subscribed_gb = 0
while subscribed_gb < self.max_gb:
tmp_site_rankings = site_rankings
dataset_name = weighted_choice(dataset_rankings)
if (not dataset_name) or (dataset_rankings[dataset_name] < self.min_rank):
break
size_gb = self.datasets.get_size(dataset_name)
unavailable_sites = set(self.datasets.get_sites(dataset_name))
for site_name in tmp_site_rankings.keys():
if (self.sites.get_available_storage(site_name) < size_gb) or (tmp_site_rankings[site_name] <= 0):
unavailable_sites.add(site_name)
for site_name in unavailable_sites:
try:
del tmp_site_rankings[site_name]
except:
continue
if not tmp_site_rankings:
break
site_name = weighted_choice(tmp_site_rankings)
subscription = (dataset_name, site_name)
subscriptions.append(subscription)
subscribed_gb += size_gb
avail_storage = self.sites.get_available_storage(site_name)
self.logger.info('rank: %s\tsize: %.2f\tdataset: %s', dataset_rankings[dataset_name], size_gb, dataset_name)
self.logger.info('rank: %s\tstorage: %d\site: %s', site_rankings[site_name], avail_storage, site_name)
new_avail_storage = avail_storage - self.datasets.get_size(dataset_name)
if new_avail_storage > 0:
new_rank = 0.0
else:
new_rank = (site_rankings[site_name]/avail_storage)*new_avail_storage
site_rankings[site_name] = new_rank
del dataset_rankings[dataset_name]
self.logger.info('Subscribed %dGB', subscribed_gb)
return subscriptions
def subscribe(self, subscriptions):
"""
Make subscriptions to phedex
subscriptions = [(dataset_name, site_name), ...]
"""
new_subscriptions = dict()
for subscription in subscriptions:
dataset_name = subscription[0]
site_name = subscription[1]
try:
new_subscriptions[site_name].append(dataset_name)
except:
new_subscriptions[site_name] = list()
new_subscriptions[site_name].append(dataset_name)
for site_name, dataset_names in new_subscriptions.items():
data = self.phedex.generate_xml(dataset_names)
comments = 'This dataset is predicted to become popular and has therefore been automatically replicated by cuadrnt'
api = 'subscribe'
params = [('node', site_name), ('data', data), ('level','dataset'), ('move', 'n'), ('custodial', 'n'), ('group', 'AnalysisOps'), ('request_only', 'n'), ('no_mail', 'n'), ('comments', comments)]
json_data = self.phedex.fetch(api=api, params=params, method='post')
# insert into db
group_name = 'AnalysisOps'
request_id = 0
request_type = 0
try:
request = json_data['phedex']
request_id = request['request_created'][0]['id']
request_created = timestamp_to_datetime(request['request_timestamp'])
except:
self.logger.warning('Subscription did not succeed\n\tSite:%s\n\tDatasets: %s', str(site_name), str(dataset_names))
continue
for dataset_name in dataset_names:
coll = 'dataset_popularity'
date = datetime_day(datetime.datetime.utcnow())
pipeline = list()
match = {'$match':{'name':dataset_name, 'date':date}}
pipeline.append(match)
project = {'$project':{'delta_popularity':1, '_id':0}}
pipeline.append(project)
data = self.storage.get_data(coll=coll, pipeline=pipeline)
dataset_rank = data[0]['delta_popularity']
query = "INSERT INTO Requests(RequestId, RequestType, DatasetId, SiteId, GroupId, Rank, Date) SELECT %s, %s, Datasets.DatasetId, Sites.SiteId, Groups.GroupId, %s, %s FROM Datasets, Sites, Groups WHERE Datasets.DatasetName=%s AND Sites.SiteName=%s AND Groups.GroupName=%s"
values = (request_id, request_type, dataset_rank, request_created, dataset_name, site_name, group_name)
self.mit_db.query(query=query, values=values, cache=False)
