250 lines
10 KiB
Python
Executable File
250 lines
10 KiB
Python
Executable File
# (C) Copyright 2019 StackHPC Limited.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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""" Monasca InfluxDB tool for migration to database per tenant
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Used to move data from monolithic database e.g. `monasca` to a database per
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tenant model, e.g. `monasca_<tenant_id>`.
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Please see the included README.rst for more details about creating an
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appropriate configuration file.
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"""
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import os
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import re
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import sys
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from monasca_persister import config
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from monasca_persister.repositories.influxdb import metrics_repository
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from oslo_config import cfg
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from oslo_log import log
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LOG = log.getLogger(__name__)
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MIGRATE_QUERY = ('SELECT * INTO "{target_db}"..:MEASUREMENT'
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' FROM "{measurement}"'
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' WHERE _tenant_id=\'{tenant_id}\''
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' AND time > {lower_time_offset}'
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' AND time <= {upper_time_offset}'
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' GROUP BY *')
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class MigrationHelper(object):
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def __init__(self):
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repo = metrics_repository.MetricInfluxdbRepository()
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self.conf = repo.conf
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self.client = repo._influxdb_client
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self.client.switch_database(self.conf.influxdb.database_name)
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def _migrate(self, measurement, tenant_id, start_time_offset,
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end_time_offset, retention_policy={}, time_unit='w',
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db_per_tenant=True, **kwargs):
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total_written = 0
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first_upper_time_offset = None
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last_lower_time_offset = None
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time_offset = start_time_offset
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if db_per_tenant:
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target_db = "{}_{}".format(self.conf.influxdb.database_name, tenant_id)
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self.client.create_database(target_db)
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if retention_policy:
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self.client.create_retention_policy(database=target_db, **retention_policy)
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LOG.info(' into {}:'.format(target_db))
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while end_time_offset > 0 and time_offset < end_time_offset:
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lower_time_offset = 'now()-{}{}'.format(time_offset + 1, time_unit)
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upper_time_offset = 'now()-{}{}'.format(time_offset, time_unit)
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if not first_upper_time_offset:
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first_upper_time_offset = upper_time_offset
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migrate_query = MIGRATE_QUERY.format(
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target_db=target_db,
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measurement=measurement,
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tenant_id=tenant_id,
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lower_time_offset=lower_time_offset,
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upper_time_offset=upper_time_offset,
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)
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LOG.debug(migrate_query)
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written = next(self.client.query(migrate_query).get_points('result')).get('written')
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total_written += written
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time_offset += 1
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if written > 0:
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last_lower_time_offset = lower_time_offset
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LOG.info(" migrated {} entries from {} -> {} (cumulative {})".format(
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written,
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lower_time_offset,
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upper_time_offset,
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total_written,
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))
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LOG.info(" finished migrating a total of {} entries from {} -> {}.".format(
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total_written,
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last_lower_time_offset,
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first_upper_time_offset,
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))
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def get_measurements(self, fname):
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measurements = []
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if fname:
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with open(fname, 'a+') as f:
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measurements = [line.strip() for line in f.readlines()]
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if not measurements:
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result = self.client.query('SHOW MEASUREMENTS').get_points('measurements')
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measurements = [m.get('name') for m in result]
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if fname:
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with open(fname, 'w') as f:
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for r in measurements:
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f.write(r + '\n')
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return measurements
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def get_tenancies(self, measurements):
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result = self.client.query("SHOW TAG VALUES WITH KEY = _tenant_id")
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return {m: [t.get('value') for t in result.get_points(m)] for m in measurements}
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def get_complete(self, fname):
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if fname:
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with open(fname, 'a+') as fd:
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return {line.strip() for line in fd.readlines()}
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else:
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return {}
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def migrate(self,
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tenant_defaults={},
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default_start_time_offset=0, # Default: now
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default_end_time_offset=520, # Default: 10 years
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skip_regex=[],
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measurements_file=None, success_file=None, failure_file=None, **kwargs):
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measurements = self.get_measurements(measurements_file)
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tenancy = self.get_tenancies(measurements)
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done = self.get_complete(success_file)
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default_rp = {}
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hours = self.conf.influxdb.default_retention_hours
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if hours > 0:
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rp = '{}h'.format(hours)
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default_rp = dict(name=rp, duration=rp, replication='1', default=True)
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skip = set()
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fail = set()
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if failure_file:
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if os.path.exists(failure_file):
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os.remove(failure_file)
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filtered_measurements = []
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for measurement in measurements:
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if any([f.match(measurement) for f in skip_regex]):
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skip.add(measurement)
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LOG.debug('Skipping {} because it matches a skip regex.'.format(measurement))
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continue
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elif measurement in done:
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LOG.debug('Skipping {} because its already done.'.format(measurement))
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continue
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else:
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filtered_measurements.append(measurement)
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for i, measurement in enumerate(filtered_measurements):
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LOG.info('Migrating {}'.format(measurement))
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try:
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for tenant_id in tenancy.get(measurement):
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start_time_offset = tenant_defaults.get(
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tenant_id, {}).get('start_time_offset_override',
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default_start_time_offset)
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end_time_offset = tenant_defaults.get(
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tenant_id, {}).get('end_time_offset_override',
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default_end_time_offset)
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# NOTE (brtknr): Ensure that the default upper and lower
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# time offsets are respected during migration by the
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# projects with custom retention policies.
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start_time_offset = max(default_start_time_offset,
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start_time_offset)
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end_time_offset = min(default_end_time_offset,
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end_time_offset)
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retention_policy = tenant_defaults.get(
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tenant_id, {}).get('rp', default_rp)
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self._migrate(measurement, tenant_id,
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start_time_offset=start_time_offset,
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end_time_offset=end_time_offset,
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retention_policy=retention_policy, **kwargs)
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if success_file:
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with open(success_file, 'a+') as fd:
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fd.write('{}\n'.format(measurement))
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done.add(measurement)
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except Exception as e:
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LOG.error(e)
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if failure_file:
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with open(failure_file, 'a+') as fe:
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fe.write('{}\t{}\n'.format(measurement, e))
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fail.add(measurement)
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LOG.info("{}/{} (done {} + skip {} + fail {})/{}".format(
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i + 1, len(filtered_measurements), len(done), len(skip),
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len(fail), len(measurements)))
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def main():
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CONF = cfg.CONF
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cli_opts = [
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cfg.StrOpt('migrate-time-unit', choices=['h', 'd', 'w'], default='w',
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help='Unit of time, h=hour, d=day, w=week (default: "w").'),
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cfg.IntOpt('migrate-start-time-offset', default=0,
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help='Start time offset in the given unit of time (default: 0).'),
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cfg.IntOpt('migrate-end-time-offset', default=520,
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help='End time offset in the given unit of time (default: 520).'),
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cfg.DictOpt('migrate-retention-policy', default={},
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help=('Custom retention policy for projects in the provided'
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'time unit. (e.g. project-id-x:2,project-id-y:4)')),
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cfg.ListOpt('migrate-skip-regex', default=[],
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help=('Skip metrics that match this comma separated list of regex patterns.'
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'(e.g. ^log\\\\..+,^cpu\\\\..+ to skip metrics beginning with log.)')),
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]
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CONF.register_cli_opts(cli_opts)
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config.parse_args("Monasca InfluxDB database per tenant migration tool")
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# Configure custom retention policy for your existing projects. For
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# example, rp2w is a retention policy of two weeks which we can assign to
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# project example-project-id.
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tenant_defaults = dict()
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for k, v in CONF.migrate_retention_policy.items():
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if v.isdigit():
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rp = '{}{}'.format(v, CONF.migrate_time_unit)
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tenant_defaults[k] = dict(
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end_time_offset_override=int(v),
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rp=dict(name=rp, duration=rp, replication='1', default=True),
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)
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LOG.info('Project {} will be applied retention policy: {}.'.format(k, rp))
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else:
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raise ValueError('Retention policy for project {} must be an'
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'integer of given time unit. Current value:'
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'{}.'.format(k, v))
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skip_regex = []
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for p in CONF.migrate_skip_regex:
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skip_regex.append(re.compile(str(p)))
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LOG.info('Metrics matching pattern "{}" will be skipped.'.format(p))
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helper = MigrationHelper()
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helper.migrate(skip_regex=skip_regex,
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tenant_defaults=tenant_defaults,
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default_end_time_offset=CONF.migrate_end_time_offset,
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default_start_time_offset=CONF.migrate_start_time_offset,
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time_unit=CONF.migrate_time_unit,
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measurements_file='migrate-measurements',
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success_file='migrate-success',
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failure_file='migrate-failure')
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return 0
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if __name__ == "__main__":
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sys.exit(main())
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