Monasca Database Persister
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monasca-persister/monasca_persister/tools/influxdb/db-per-tenant/migrate-to-db-per-tenant.py

249 lines
10 KiB

# (C) Copyright 2019 StackHPC Limited.
#
# 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.
""" Monasca InfluxDB tool for migration to database per tenant
Used to move data from monolithic database e.g. `monasca` to a database per
tenant model, e.g. `monasca_<tenant_id>`.
Please see the included README.rst for more details about creating an
appropriate configuration file.
"""
import os
import re
import sys
from monasca_persister import config
from monasca_persister.repositories.influxdb import metrics_repository
from oslo_config import cfg
from oslo_log import log
LOG = log.getLogger(__name__)
MIGRATE_QUERY = ('SELECT * INTO "{target_db}"..:MEASUREMENT'
' FROM "{measurement}"'
' WHERE _tenant_id=\'{tenant_id}\''
' AND time > {lower_time_offset}'
' AND time <= {upper_time_offset}'
' GROUP BY *')
class MigrationHelper(object):
def __init__(self):
repo = metrics_repository.MetricInfluxdbRepository()
self.conf = repo.conf
self.client = repo._influxdb_client
self.client.switch_database(self.conf.influxdb.database_name)
def _migrate(self, measurement, tenant_id, start_time_offset,
end_time_offset, retention_policy={}, time_unit='w',
db_per_tenant=True, **kwargs):
total_written = 0
first_upper_time_offset = None
last_lower_time_offset = None
time_offset = start_time_offset
if db_per_tenant:
target_db = "{}_{}".format(self.conf.influxdb.database_name, tenant_id)
self.client.create_database(target_db)
if retention_policy:
self.client.create_retention_policy(database=target_db, **retention_policy)
LOG.info(' into {}:'.format(target_db))
while end_time_offset > 0 and time_offset < end_time_offset:
lower_time_offset = 'now()-{}{}'.format(time_offset + 1, time_unit)
upper_time_offset = 'now()-{}{}'.format(time_offset, time_unit)
if not first_upper_time_offset:
first_upper_time_offset = upper_time_offset
migrate_query = MIGRATE_QUERY.format(
target_db=target_db,
measurement=measurement,
tenant_id=tenant_id,
lower_time_offset=lower_time_offset,
upper_time_offset=upper_time_offset,
)
LOG.debug(migrate_query)
written = next(self.client.query(migrate_query).get_points('result')).get('written')
total_written += written
time_offset += 1
if written > 0:
last_lower_time_offset = lower_time_offset
LOG.info(" migrated {} entries from {} -> {} (cumulative {})".format(
written,
lower_time_offset,
upper_time_offset,
total_written,
))
LOG.info(" finished migrating a total of {} entries from {} -> {}.".format(
total_written,
last_lower_time_offset,
first_upper_time_offset,
))
def get_measurements(self, fname):
measurements = []
if fname:
with open(fname, 'a+') as f:
measurements = [line.strip() for line in f.readlines()]
if not measurements:
result = self.client.query('SHOW MEASUREMENTS').get_points('measurements')
measurements = [m.get('name') for m in result]
if fname:
with open(fname, 'w') as f:
for r in measurements:
f.write(r + '\n')
return measurements
def get_tenancies(self, measurements):
result = self.client.query("SHOW TAG VALUES WITH KEY = _tenant_id")
return {m: [t.get('value') for t in result.get_points(m)] for m in measurements}
def get_complete(self, fname):
if fname:
with open(fname, 'a+') as fd:
return {line.strip() for line in fd.readlines()}
else:
return {}
def migrate(self,
tenant_defaults={},
default_start_time_offset=0, # Default: now
default_end_time_offset=520, # Default: 10 years
skip_regex=[],
measurements_file=None, success_file=None, failure_file=None, **kwargs):
measurements = self.get_measurements(measurements_file)
tenancy = self.get_tenancies(measurements)
done = self.get_complete(success_file)
default_rp = {}
hours = self.conf.influxdb.default_retention_hours
if hours > 0:
rp = '{}h'.format(hours)
default_rp = dict(name=rp, duration=rp, replication='1', default=True)
skip = set()
fail = set()
if failure_file:
if os.path.exists(failure_file):
os.remove(failure_file)
filtered_measurements = []
for measurement in measurements:
if any([f.match(measurement) for f in skip_regex]):
skip.add(measurement)
LOG.debug('Skipping {} because it matches a skip regex.'.format(measurement))
continue
elif measurement in done:
LOG.debug('Skipping {} because its already done.'.format(measurement))
continue
else:
filtered_measurements.append(measurement)
for i, measurement in enumerate(filtered_measurements):
LOG.info('Migrating {}'.format(measurement))
try:
for tenant_id in tenancy.get(measurement):
start_time_offset = tenant_defaults.get(
tenant_id, {}).get('start_time_offset_override',
default_start_time_offset)
end_time_offset = tenant_defaults.get(
tenant_id, {}).get('end_time_offset_override',
default_end_time_offset)
# NOTE (brtknr): Ensure that the default upper and lower
# time offsets are respected during migration by the
# projects with custom retention policies.
start_time_offset = max(default_start_time_offset,
start_time_offset)
end_time_offset = min(default_end_time_offset,
end_time_offset)
retention_policy = tenant_defaults.get(
tenant_id, {}).get('rp', default_rp)
self._migrate(measurement, tenant_id,
start_time_offset=start_time_offset,
end_time_offset=end_time_offset,
retention_policy=retention_policy, **kwargs)
if success_file:
with open(success_file, 'a+') as fd:
fd.write('{}\n'.format(measurement))
done.add(measurement)
except Exception as e:
LOG.error(e)
if failure_file:
with open(failure_file, 'a+') as fe:
fe.write('{}\t{}\n'.format(measurement, e))
fail.add(measurement)
LOG.info("{}/{} (done {} + skip {} + fail {})/{}".format(
i + 1, len(filtered_measurements), len(done), len(skip),
len(fail), len(measurements)))
def main():
CONF = cfg.CONF
cli_opts = [
cfg.StrOpt('migrate-time-unit', choices=['h', 'd', 'w'], default='w',
help='Unit of time, h=hour, d=day, w=week (default: "w").'),
cfg.IntOpt('migrate-start-time-offset', default=0,
help='Start time offset in the given unit of time (default: 0).'),
cfg.IntOpt('migrate-end-time-offset', default=520,
help='End time offset in the given unit of time (default: 520).'),
cfg.DictOpt('migrate-retention-policy', default={},
help=('Custom retention policy for projects in the provided'
'time unit. (e.g. project-id-x:2,project-id-y:4)')),
cfg.ListOpt('migrate-skip-regex', default=[],
help=('Skip metrics that match this comma separated list of regex patterns.'
'(e.g. ^log\\\\..+,^cpu\\\\..+ to skip metrics beginning with log.)')),
]
CONF.register_cli_opts(cli_opts)
config.parse_args("Monasca InfluxDB database per tenant migration tool")
# Configure custom retention policy for your existing projects. For
# example, rp2w is a retention policy of two weeks which we can assign to
# project example-project-id.
tenant_defaults = dict()
for k, v in CONF.migrate_retention_policy.items():
if v.isdigit():
rp = '{}{}'.format(v, CONF.migrate_time_unit)
tenant_defaults[k] = dict(
end_time_offset_override=int(v),
rp=dict(name=rp, duration=rp, replication='1', default=True),
)
LOG.info('Project {} will be applied retention policy: {}.'.format(k, rp))
else:
raise ValueError('Retention policy for project {} must be an'
'integer of given time unit. Current value:'
'{}.'.format(k, v))
skip_regex = []
for p in CONF.migrate_skip_regex:
skip_regex.append(re.compile(str(p)))
LOG.info('Metrics matching pattern "{}" will be skipped.'.format(p))
helper = MigrationHelper()
helper.migrate(skip_regex=skip_regex,
tenant_defaults=tenant_defaults,
default_end_time_offset=CONF.migrate_end_time_offset,
default_start_time_offset=CONF.migrate_start_time_offset,
time_unit=CONF.migrate_time_unit,
measurements_file='migrate-measurements',
success_file='migrate-success',
failure_file='migrate-failure')
return 0
if __name__ == "__main__":
sys.exit(main())