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OpenStack Study: updater.py**** CubicPower OpenStack Study ****
# Copyright (c) 2010-2012 OpenStack Foundation # # 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. import logging import os import signal import sys import time from swift import gettext_ as _ from random import random, shuffle from tempfile import mkstemp from eventlet import spawn, patcher, Timeout import swift.common.db from swift.container.backend import ContainerBroker, DATADIR from swift.common.bufferedhttp import http_connect from swift.common.exceptions import ConnectionTimeout from swift.common.ring import Ring from swift.common.utils import get_logger, config_true_value, ismount, \ dump_recon_cache, quorum_size from swift.common.daemon import Daemon from swift.common.http import is_success, HTTP_INTERNAL_SERVER_ERROR
**** CubicPower OpenStack Study **** class ContainerUpdater(Daemon): """Update container information in account listings."""
**** CubicPower OpenStack Study **** def __init__(self, conf): self.conf = conf self.logger = get_logger(conf, log_route='container-updater') self.devices = conf.get('devices', '/srv/node') self.mount_check = config_true_value(conf.get('mount_check', 'true')) self.swift_dir = conf.get('swift_dir', '/etc/swift') self.interval = int(conf.get('interval', 300)) self.account_ring = None self.concurrency = int(conf.get('concurrency', 4)) self.slowdown = float(conf.get('slowdown', 0.01)) self.node_timeout = int(conf.get('node_timeout', 3)) self.conn_timeout = float(conf.get('conn_timeout', 0.5)) self.no_changes = 0 self.successes = 0 self.failures = 0 self.account_suppressions = {} self.account_suppression_time = \ float(conf.get('account_suppression_time', 60)) self.new_account_suppressions = None swift.common.db.DB_PREALLOCATION = \ config_true_value(conf.get('db_preallocation', 'f')) self.recon_cache_path = conf.get('recon_cache_path', '/var/cache/swift') self.rcache = os.path.join(self.recon_cache_path, "container.recon") self.user_agent = 'container-updater %s' % os.getpid()
**** CubicPower OpenStack Study **** def get_account_ring(self): """Get the account ring. Load it if it hasn't been yet.""" if not self.account_ring: self.account_ring = Ring(self.swift_dir, ring_name='account') return self.account_ring
**** CubicPower OpenStack Study **** def get_paths(self): """ Get paths to all of the partitions on each drive to be processed. :returns: a list of paths """ paths = [] for device in os.listdir(self.devices): dev_path = os.path.join(self.devices, device) if self.mount_check and not ismount(dev_path): self.logger.warn(_('%s is not mounted'), device) continue con_path = os.path.join(dev_path, DATADIR) if not os.path.exists(con_path): continue for partition in os.listdir(con_path): paths.append(os.path.join(con_path, partition)) shuffle(paths) return paths
**** CubicPower OpenStack Study **** def _load_suppressions(self, filename): try: with open(filename, 'r') as tmpfile: for line in tmpfile: account, until = line.split() until = float(until) self.account_suppressions[account] = until except Exception: self.logger.exception( _('ERROR with loading suppressions from %s: ') % filename) finally: os.unlink(filename)
**** CubicPower OpenStack Study **** def run_forever(self, *args, **kwargs): """ Run the updator continuously. """ time.sleep(random() * self.interval) while True: self.logger.info(_('Begin container update sweep')) begin = time.time() now = time.time() expired_suppressions = \ [a for a, u in self.account_suppressions.iteritems() if u < now] for account in expired_suppressions: del self.account_suppressions[account] pid2filename = {} # read from account ring to ensure it's fresh self.get_account_ring().get_nodes('') for path in self.get_paths(): while len(pid2filename) >= self.concurrency: pid = os.wait()[0] try: self._load_suppressions(pid2filename[pid]) finally: del pid2filename[pid] fd, tmpfilename = mkstemp() os.close(fd) pid = os.fork() if pid: pid2filename[pid] = tmpfilename else: signal.signal(signal.SIGTERM, signal.SIG_DFL) patcher.monkey_patch(all=False, socket=True) self.no_changes = 0 self.successes = 0 self.failures = 0 self.new_account_suppressions = open(tmpfilename, 'w') forkbegin = time.time() self.container_sweep(path) elapsed = time.time() - forkbegin self.logger.debug( _('Container update sweep of %(path)s completed: ' '%(elapsed).02fs, %(success)s successes, %(fail)s ' 'failures, %(no_change)s with no changes'), {'path': path, 'elapsed': elapsed, 'success': self.successes, 'fail': self.failures, 'no_change': self.no_changes}) sys.exit() while pid2filename: pid = os.wait()[0] try: self._load_suppressions(pid2filename[pid]) finally: del pid2filename[pid] elapsed = time.time() - begin self.logger.info(_('Container update sweep completed: %.02fs'), elapsed) dump_recon_cache({'container_updater_sweep': elapsed}, self.rcache, self.logger) if elapsed < self.interval: time.sleep(self.interval - elapsed)
**** CubicPower OpenStack Study **** def run_once(self, *args, **kwargs): """ Run the updater once. """ patcher.monkey_patch(all=False, socket=True) self.logger.info(_('Begin container update single threaded sweep')) begin = time.time() self.no_changes = 0 self.successes = 0 self.failures = 0 for path in self.get_paths(): self.container_sweep(path) elapsed = time.time() - begin self.logger.info(_( 'Container update single threaded sweep completed: ' '%(elapsed).02fs, %(success)s successes, %(fail)s failures, ' '%(no_change)s with no changes'), {'elapsed': elapsed, 'success': self.successes, 'fail': self.failures, 'no_change': self.no_changes}) dump_recon_cache({'container_updater_sweep': elapsed}, self.rcache, self.logger)
**** CubicPower OpenStack Study **** def container_sweep(self, path): """ Walk the path looking for container DBs and process them. :param path: path to walk """ for root, dirs, files in os.walk(path): for file in files: if file.endswith('.db'): self.process_container(os.path.join(root, file)) time.sleep(self.slowdown)
**** CubicPower OpenStack Study **** def process_container(self, dbfile): """ Process a container, and update the information in the account. :param dbfile: container DB to process """ start_time = time.time() broker = ContainerBroker(dbfile, logger=self.logger) info = broker.get_info() # Don't send updates if the container was auto-created since it # definitely doesn't have up to date statistics. if float(info['put_timestamp']) <= 0: return if self.account_suppressions.get(info['account'], 0) > time.time(): return if info['put_timestamp'] > info['reported_put_timestamp'] or \ info['delete_timestamp'] > info['reported_delete_timestamp'] \ or info['object_count'] != info['reported_object_count'] or \ info['bytes_used'] != info['reported_bytes_used']: container = '/%s/%s' % (info['account'], info['container']) part, nodes = self.get_account_ring().get_nodes(info['account']) events = [spawn(self.container_report, node, part, container, info['put_timestamp'], info['delete_timestamp'], info['object_count'], info['bytes_used']) for node in nodes] successes = 0 for event in events: if is_success(event.wait()): successes += 1 if successes >= quorum_size(len(events)): self.logger.increment('successes') self.successes += 1 self.logger.debug( _('Update report sent for %(container)s %(dbfile)s'), {'container': container, 'dbfile': dbfile}) broker.reported(info['put_timestamp'], info['delete_timestamp'], info['object_count'], info['bytes_used']) else: self.logger.increment('failures') self.failures += 1 self.logger.debug( _('Update report failed for %(container)s %(dbfile)s'), {'container': container, 'dbfile': dbfile}) self.account_suppressions[info['account']] = until = \ time.time() + self.account_suppression_time if self.new_account_suppressions: print >>self.new_account_suppressions, \ info['account'], until # Only track timing data for attempted updates: self.logger.timing_since('timing', start_time) else: self.logger.increment('no_changes') self.no_changes += 1
**** CubicPower OpenStack Study **** def container_report(self, node, part, container, put_timestamp, delete_timestamp, count, bytes): """ Report container info to an account server. :param node: node dictionary from the account ring :param part: partition the account is on :param container: container name :param put_timestamp: put timestamp :param delete_timestamp: delete timestamp :param count: object count in the container :param bytes: bytes used in the container """ with ConnectionTimeout(self.conn_timeout): try: headers = { 'X-Put-Timestamp': put_timestamp, 'X-Delete-Timestamp': delete_timestamp, 'X-Object-Count': count, 'X-Bytes-Used': bytes, 'X-Account-Override-Deleted': 'yes', 'user-agent': self.user_agent} conn = http_connect( node['ip'], node['port'], node['device'], part, 'PUT', container, headers=headers) except (Exception, Timeout): self.logger.exception(_( 'ERROR account update failed with ' '%(ip)s:%(port)s/%(device)s (will retry later): '), node) return HTTP_INTERNAL_SERVER_ERROR with Timeout(self.node_timeout): try: resp = conn.getresponse() resp.read() return resp.status except (Exception, Timeout): if self.logger.getEffectiveLevel() <= logging.DEBUG: self.logger.exception( _('Exception with %(ip)s:%(port)s/%(device)s'), node) return HTTP_INTERNAL_SERVER_ERROR finally: conn.close()
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