698 lines
30 KiB
Python
698 lines
30 KiB
Python
# Copyright (c) 2010-2012 OpenStack, LLC.
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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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from __future__ import with_statement
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import os
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import random
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import math
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import time
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import shutil
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import uuid
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import errno
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import re
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from eventlet import GreenPool, sleep, Timeout
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from eventlet.green import subprocess
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import simplejson
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import swift.common.db
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from swift.common.direct_client import quote
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from swift.common.utils import get_logger, whataremyips, storage_directory, \
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renamer, mkdirs, lock_parent_directory, config_true_value, \
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unlink_older_than, dump_recon_cache, rsync_ip
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from swift.common import ring
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from swift.common.http import HTTP_NOT_FOUND, HTTP_INSUFFICIENT_STORAGE
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from swift.common.bufferedhttp import BufferedHTTPConnection
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from swift.common.exceptions import DriveNotMounted, ConnectionTimeout
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from swift.common.daemon import Daemon
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from swift.common.swob import Response, HTTPNotFound, HTTPNoContent, \
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HTTPAccepted, HTTPBadRequest
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DEBUG_TIMINGS_THRESHOLD = 10
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def quarantine_db(object_file, server_type):
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"""
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In the case that a corrupt file is found, move it to a quarantined area to
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allow replication to fix it.
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:param object_file: path to corrupt file
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:param server_type: type of file that is corrupt
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('container' or 'account')
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"""
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object_dir = os.path.dirname(object_file)
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quarantine_dir = os.path.abspath(
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os.path.join(object_dir, '..', '..', '..', '..', 'quarantined',
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server_type + 's', os.path.basename(object_dir)))
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try:
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renamer(object_dir, quarantine_dir)
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except OSError, e:
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if e.errno not in (errno.EEXIST, errno.ENOTEMPTY):
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raise
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quarantine_dir = "%s-%s" % (quarantine_dir, uuid.uuid4().hex)
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renamer(object_dir, quarantine_dir)
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def roundrobin_datadirs(datadirs):
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"""
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Generator to walk the data dirs in a round robin manner, evenly
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hitting each device on the system, and yielding any .db files
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found (in their proper places). The partitions within each data
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dir are walked randomly, however.
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:param datadirs: a list of (path, node_id) to walk
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:returns: A generator of (partition, path_to_db_file, node_id)
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"""
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def walk_datadir(datadir, node_id):
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partitions = os.listdir(datadir)
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random.shuffle(partitions)
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for partition in partitions:
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part_dir = os.path.join(datadir, partition)
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if not os.path.isdir(part_dir):
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continue
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suffixes = os.listdir(part_dir)
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for suffix in suffixes:
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suff_dir = os.path.join(part_dir, suffix)
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if not os.path.isdir(suff_dir):
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continue
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hashes = os.listdir(suff_dir)
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for hsh in hashes:
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hash_dir = os.path.join(suff_dir, hsh)
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if not os.path.isdir(hash_dir):
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continue
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object_file = os.path.join(hash_dir, hsh + '.db')
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if os.path.exists(object_file):
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yield (partition, object_file, node_id)
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its = [walk_datadir(datadir, node_id) for datadir, node_id in datadirs]
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while its:
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for it in its:
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try:
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yield it.next()
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except StopIteration:
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its.remove(it)
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class ReplConnection(BufferedHTTPConnection):
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"""
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Helper to simplify REPLICATEing to a remote server.
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"""
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def __init__(self, node, partition, hash_, logger):
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""
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self.logger = logger
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self.node = node
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host = "%s:%s" % (node['replication_ip'], node['replication_port'])
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BufferedHTTPConnection.__init__(self, host)
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self.path = '/%s/%s/%s' % (node['device'], partition, hash_)
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def replicate(self, *args):
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"""
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Make an HTTP REPLICATE request
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:param args: list of json-encodable objects
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:returns: httplib response object
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"""
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try:
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body = simplejson.dumps(args)
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self.request('REPLICATE', self.path, body,
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{'Content-Type': 'application/json'})
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response = self.getresponse()
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response.data = response.read()
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return response
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except (Exception, Timeout):
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self.logger.exception(
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_('ERROR reading HTTP response from %s'), self.node)
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return None
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class Replicator(Daemon):
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"""
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Implements the logic for directing db replication.
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"""
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def __init__(self, conf):
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self.conf = conf
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self.logger = get_logger(conf, log_route='replicator')
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self.root = conf.get('devices', '/srv/node')
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self.mount_check = config_true_value(conf.get('mount_check', 'true'))
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self.port = int(conf.get('bind_port', self.default_port))
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concurrency = int(conf.get('concurrency', 8))
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self.cpool = GreenPool(size=concurrency)
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swift_dir = conf.get('swift_dir', '/etc/swift')
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self.ring = ring.Ring(swift_dir, ring_name=self.server_type)
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self.per_diff = int(conf.get('per_diff', 1000))
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self.max_diffs = int(conf.get('max_diffs') or 100)
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self.interval = int(conf.get('interval') or
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conf.get('run_pause') or 30)
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self.vm_test_mode = config_true_value(conf.get('vm_test_mode', 'no'))
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self.node_timeout = int(conf.get('node_timeout', 10))
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self.conn_timeout = float(conf.get('conn_timeout', 0.5))
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self.reclaim_age = float(conf.get('reclaim_age', 86400 * 7))
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swift.common.db.DB_PREALLOCATION = \
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config_true_value(conf.get('db_preallocation', 'f'))
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self._zero_stats()
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self.recon_cache_path = conf.get('recon_cache_path',
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'/var/cache/swift')
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self.recon_replicator = '%s.recon' % self.server_type
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self.rcache = os.path.join(self.recon_cache_path,
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self.recon_replicator)
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self.extract_device_re = re.compile('%s%s([^%s]+)' % (
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self.root, os.path.sep, os.path.sep))
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def _zero_stats(self):
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"""Zero out the stats."""
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self.stats = {'attempted': 0, 'success': 0, 'failure': 0, 'ts_repl': 0,
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'no_change': 0, 'hashmatch': 0, 'rsync': 0, 'diff': 0,
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'remove': 0, 'empty': 0, 'remote_merge': 0,
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'start': time.time(), 'diff_capped': 0}
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def _report_stats(self):
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"""Report the current stats to the logs."""
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self.logger.info(
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_('Attempted to replicate %(count)d dbs in %(time).5f seconds '
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'(%(rate).5f/s)'),
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{'count': self.stats['attempted'],
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'time': time.time() - self.stats['start'],
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'rate': self.stats['attempted'] /
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(time.time() - self.stats['start'] + 0.0000001)})
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self.logger.info(_('Removed %(remove)d dbs') % self.stats)
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self.logger.info(_('%(success)s successes, %(failure)s failures')
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% self.stats)
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dump_recon_cache(
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{'replication_stats': self.stats,
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'replication_time': time.time() - self.stats['start'],
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'replication_last': time.time()},
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self.rcache, self.logger)
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self.logger.info(' '.join(['%s:%s' % item for item in
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self.stats.items() if item[0] in
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('no_change', 'hashmatch', 'rsync', 'diff', 'ts_repl',
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'empty', 'diff_capped')]))
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def _rsync_file(self, db_file, remote_file, whole_file=True):
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"""
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Sync a single file using rsync. Used by _rsync_db to handle syncing.
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:param db_file: file to be synced
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:param remote_file: remote location to sync the DB file to
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:param whole-file: if True, uses rsync's --whole-file flag
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:returns: True if the sync was successful, False otherwise
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"""
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popen_args = ['rsync', '--quiet', '--no-motd',
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'--timeout=%s' % int(math.ceil(self.node_timeout)),
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'--contimeout=%s' % int(math.ceil(self.conn_timeout))]
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if whole_file:
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popen_args.append('--whole-file')
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popen_args.extend([db_file, remote_file])
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proc = subprocess.Popen(popen_args)
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proc.communicate()
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if proc.returncode != 0:
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self.logger.error(_('ERROR rsync failed with %(code)s: %(args)s'),
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{'code': proc.returncode, 'args': popen_args})
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return proc.returncode == 0
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def _rsync_db(self, broker, device, http, local_id,
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replicate_method='complete_rsync', replicate_timeout=None):
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"""
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Sync a whole db using rsync.
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:param broker: DB broker object of DB to be synced
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:param device: device to sync to
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:param http: ReplConnection object
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:param local_id: unique ID of the local database replica
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:param replicate_method: remote operation to perform after rsync
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:param replicate_timeout: timeout to wait in seconds
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"""
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device_ip = rsync_ip(device['replication_ip'])
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if self.vm_test_mode:
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remote_file = '%s::%s%s/%s/tmp/%s' % (
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device_ip, self.server_type, device['replication_port'],
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device['device'], local_id)
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else:
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remote_file = '%s::%s/%s/tmp/%s' % (
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device_ip, self.server_type, device['device'], local_id)
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mtime = os.path.getmtime(broker.db_file)
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if not self._rsync_file(broker.db_file, remote_file):
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return False
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# perform block-level sync if the db was modified during the first sync
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if os.path.exists(broker.db_file + '-journal') or \
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os.path.getmtime(broker.db_file) > mtime:
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# grab a lock so nobody else can modify it
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with broker.lock():
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if not self._rsync_file(broker.db_file, remote_file, False):
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return False
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with Timeout(replicate_timeout or self.node_timeout):
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response = http.replicate(replicate_method, local_id)
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return response and response.status >= 200 and response.status < 300
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def _usync_db(self, point, broker, http, remote_id, local_id):
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"""
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Sync a db by sending all records since the last sync.
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:param point: synchronization high water mark between the replicas
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:param broker: database broker object
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:param http: ReplConnection object for the remote server
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:param remote_id: database id for the remote replica
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:param local_id: database id for the local replica
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:returns: boolean indicating completion and success
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"""
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self.stats['diff'] += 1
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self.logger.increment('diffs')
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self.logger.debug(_('Syncing chunks with %s'), http.host)
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sync_table = broker.get_syncs()
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objects = broker.get_items_since(point, self.per_diff)
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diffs = 0
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while len(objects) and diffs < self.max_diffs:
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diffs += 1
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with Timeout(self.node_timeout):
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response = http.replicate('merge_items', objects, local_id)
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if not response or response.status >= 300 or response.status < 200:
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if response:
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self.logger.error(_('ERROR Bad response %(status)s from '
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'%(host)s'),
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{'status': response.status,
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'host': http.host})
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return False
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point = objects[-1]['ROWID']
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objects = broker.get_items_since(point, self.per_diff)
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if objects:
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self.logger.debug(_(
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'Synchronization for %s has fallen more than '
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'%s rows behind; moving on and will try again next pass.') %
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(broker.db_file, self.max_diffs * self.per_diff))
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self.stats['diff_capped'] += 1
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self.logger.increment('diff_caps')
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else:
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with Timeout(self.node_timeout):
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response = http.replicate('merge_syncs', sync_table)
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if response and response.status >= 200 and response.status < 300:
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broker.merge_syncs([{'remote_id': remote_id,
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'sync_point': point}],
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incoming=False)
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return True
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return False
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def _in_sync(self, rinfo, info, broker, local_sync):
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"""
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Determine whether or not two replicas of a databases are considered
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to be in sync.
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:param rinfo: remote database info
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:param info: local database info
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:param broker: database broker object
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:param local_sync: cached last sync point between replicas
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:returns: boolean indicating whether or not the replicas are in sync
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"""
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if max(rinfo['point'], local_sync) >= info['max_row']:
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self.stats['no_change'] += 1
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self.logger.increment('no_changes')
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return True
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if rinfo['hash'] == info['hash']:
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self.stats['hashmatch'] += 1
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self.logger.increment('hashmatches')
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broker.merge_syncs([{'remote_id': rinfo['id'],
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'sync_point': rinfo['point']}],
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incoming=False)
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return True
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def _http_connect(self, node, partition, db_file):
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"""
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Make an http_connection using ReplConnection
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:param node: node dictionary from the ring
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:param partition: partition partition to send in the url
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:param db_file: DB file
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:returns: ReplConnection object
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"""
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return ReplConnection(node, partition,
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os.path.basename(db_file).split('.', 1)[0],
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self.logger)
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def _repl_to_node(self, node, broker, partition, info):
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"""
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Replicate a database to a node.
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:param node: node dictionary from the ring to be replicated to
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:param broker: DB broker for the DB to be replication
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:param partition: partition on the node to replicate to
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:param info: DB info as a dictionary of {'max_row', 'hash', 'id',
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'created_at', 'put_timestamp', 'delete_timestamp',
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'metadata'}
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:returns: True if successful, False otherwise
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"""
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with ConnectionTimeout(self.conn_timeout):
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http = self._http_connect(node, partition, broker.db_file)
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if not http:
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self.logger.error(
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_('ERROR Unable to connect to remote server: %s'), node)
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return False
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with Timeout(self.node_timeout):
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response = http.replicate(
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'sync', info['max_row'], info['hash'], info['id'],
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info['created_at'], info['put_timestamp'],
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info['delete_timestamp'], info['metadata'])
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if not response:
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return False
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elif response.status == HTTP_NOT_FOUND: # completely missing, rsync
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self.stats['rsync'] += 1
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self.logger.increment('rsyncs')
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return self._rsync_db(broker, node, http, info['id'])
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elif response.status == HTTP_INSUFFICIENT_STORAGE:
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raise DriveNotMounted()
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elif response.status >= 200 and response.status < 300:
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rinfo = simplejson.loads(response.data)
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local_sync = broker.get_sync(rinfo['id'], incoming=False)
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if self._in_sync(rinfo, info, broker, local_sync):
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return True
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# if the difference in rowids between the two differs by
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# more than 50%, rsync then do a remote merge.
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if rinfo['max_row'] / float(info['max_row']) < 0.5:
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self.stats['remote_merge'] += 1
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self.logger.increment('remote_merges')
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return self._rsync_db(broker, node, http, info['id'],
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replicate_method='rsync_then_merge',
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replicate_timeout=(info['count'] / 2000))
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# else send diffs over to the remote server
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return self._usync_db(max(rinfo['point'], local_sync),
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broker, http, rinfo['id'], info['id'])
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def _replicate_object(self, partition, object_file, node_id):
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"""
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Replicate the db, choosing method based on whether or not it
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already exists on peers.
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:param partition: partition to be replicated to
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:param object_file: DB file name to be replicated
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:param node_id: node id of the node to be replicated to
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"""
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start_time = time.time()
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self.logger.debug(_('Replicating db %s'), object_file)
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self.stats['attempted'] += 1
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self.logger.increment('attempts')
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shouldbehere = True
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try:
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broker = self.brokerclass(object_file, pending_timeout=30)
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broker.reclaim(time.time() - self.reclaim_age,
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time.time() - (self.reclaim_age * 2))
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info = broker.get_replication_info()
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full_info = broker.get_info()
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bpart = self.ring.get_part(
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full_info['account'], full_info.get('container'))
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if bpart != int(partition):
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partition = bpart
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# Important to set this false here since the later check only
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# checks if it's on the proper device, not partition.
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shouldbehere = False
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name = '/' + quote(full_info['account'])
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if 'container' in full_info:
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name += '/' + quote(full_info['container'])
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self.logger.error(
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'Found %s for %s when it should be on partition %s; will '
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'replicate out and remove.' % (object_file, name, bpart))
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except (Exception, Timeout), e:
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if 'no such table' in str(e):
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self.logger.error(_('Quarantining DB %s'), object_file)
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quarantine_db(broker.db_file, broker.db_type)
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else:
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self.logger.exception(_('ERROR reading db %s'), object_file)
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self.stats['failure'] += 1
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self.logger.increment('failures')
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return
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# The db is considered deleted if the delete_timestamp value is greater
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# than the put_timestamp, and there are no objects.
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delete_timestamp = 0
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try:
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delete_timestamp = float(info['delete_timestamp'])
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except ValueError:
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pass
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put_timestamp = 0
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try:
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put_timestamp = float(info['put_timestamp'])
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except ValueError:
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pass
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if delete_timestamp < (time.time() - self.reclaim_age) and \
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delete_timestamp > put_timestamp and \
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info['count'] in (None, '', 0, '0'):
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if self.report_up_to_date(full_info):
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self.delete_db(object_file)
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self.logger.timing_since('timing', start_time)
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return
|
|
responses = []
|
|
nodes = self.ring.get_part_nodes(int(partition))
|
|
if shouldbehere:
|
|
shouldbehere = bool([n for n in nodes if n['id'] == node_id])
|
|
# See Footnote [1] for an explanation of the repl_nodes assignment.
|
|
i = 0
|
|
while i < len(nodes) and nodes[i]['id'] != node_id:
|
|
i += 1
|
|
repl_nodes = nodes[i + 1:] + nodes[:i]
|
|
more_nodes = self.ring.get_more_nodes(int(partition))
|
|
for node in repl_nodes:
|
|
success = False
|
|
try:
|
|
success = self._repl_to_node(node, broker, partition, info)
|
|
except DriveNotMounted:
|
|
repl_nodes.append(more_nodes.next())
|
|
self.logger.error(_('ERROR Remote drive not mounted %s'), node)
|
|
except (Exception, Timeout):
|
|
self.logger.exception(_('ERROR syncing %(file)s with node'
|
|
' %(node)s'),
|
|
{'file': object_file, 'node': node})
|
|
self.stats['success' if success else 'failure'] += 1
|
|
self.logger.increment('successes' if success else 'failures')
|
|
responses.append(success)
|
|
if not shouldbehere and all(responses):
|
|
# If the db shouldn't be on this node and has been successfully
|
|
# synced to all of its peers, it can be removed.
|
|
self.delete_db(object_file)
|
|
self.logger.timing_since('timing', start_time)
|
|
|
|
def delete_db(self, object_file):
|
|
hash_dir = os.path.dirname(object_file)
|
|
suf_dir = os.path.dirname(hash_dir)
|
|
with lock_parent_directory(object_file):
|
|
shutil.rmtree(hash_dir, True)
|
|
try:
|
|
os.rmdir(suf_dir)
|
|
except OSError, err:
|
|
if err.errno not in (errno.ENOENT, errno.ENOTEMPTY):
|
|
self.logger.exception(
|
|
_('ERROR while trying to clean up %s') % suf_dir)
|
|
self.stats['remove'] += 1
|
|
device_name = self.extract_device(object_file)
|
|
self.logger.increment('removes.' + device_name)
|
|
|
|
def extract_device(self, object_file):
|
|
"""
|
|
Extract the device name from an object path. Returns "UNKNOWN" if the
|
|
path could not be extracted successfully for some reason.
|
|
|
|
:param object_file: the path to a database file.
|
|
"""
|
|
match = self.extract_device_re.match(object_file)
|
|
if match:
|
|
return match.groups()[0]
|
|
return "UNKNOWN"
|
|
|
|
def report_up_to_date(self, full_info):
|
|
return True
|
|
|
|
def run_once(self, *args, **kwargs):
|
|
"""Run a replication pass once."""
|
|
self._zero_stats()
|
|
dirs = []
|
|
ips = whataremyips()
|
|
if not ips:
|
|
self.logger.error(_('ERROR Failed to get my own IPs?'))
|
|
return
|
|
for node in self.ring.devs:
|
|
if (node and node['replication_ip'] in ips and
|
|
node['replication_port'] == self.port):
|
|
if self.mount_check and not os.path.ismount(
|
|
os.path.join(self.root, node['device'])):
|
|
self.logger.warn(
|
|
_('Skipping %(device)s as it is not mounted') % node)
|
|
continue
|
|
unlink_older_than(
|
|
os.path.join(self.root, node['device'], 'tmp'),
|
|
time.time() - self.reclaim_age)
|
|
datadir = os.path.join(self.root, node['device'], self.datadir)
|
|
if os.path.isdir(datadir):
|
|
dirs.append((datadir, node['id']))
|
|
self.logger.info(_('Beginning replication run'))
|
|
for part, object_file, node_id in roundrobin_datadirs(dirs):
|
|
self.cpool.spawn_n(
|
|
self._replicate_object, part, object_file, node_id)
|
|
self.cpool.waitall()
|
|
self.logger.info(_('Replication run OVER'))
|
|
self._report_stats()
|
|
|
|
def run_forever(self, *args, **kwargs):
|
|
"""
|
|
Replicate dbs under the given root in an infinite loop.
|
|
"""
|
|
sleep(random.random() * self.interval)
|
|
while True:
|
|
begin = time.time()
|
|
try:
|
|
self.run_once()
|
|
except (Exception, Timeout):
|
|
self.logger.exception(_('ERROR trying to replicate'))
|
|
elapsed = time.time() - begin
|
|
if elapsed < self.interval:
|
|
sleep(self.interval - elapsed)
|
|
|
|
|
|
class ReplicatorRpc(object):
|
|
"""Handle Replication RPC calls. TODO(redbo): document please :)"""
|
|
|
|
def __init__(self, root, datadir, broker_class, mount_check=True,
|
|
logger=None):
|
|
self.root = root
|
|
self.datadir = datadir
|
|
self.broker_class = broker_class
|
|
self.mount_check = mount_check
|
|
self.logger = logger or get_logger({}, log_route='replicator-rpc')
|
|
|
|
def dispatch(self, replicate_args, args):
|
|
if not hasattr(args, 'pop'):
|
|
return HTTPBadRequest(body='Invalid object type')
|
|
op = args.pop(0)
|
|
drive, partition, hsh = replicate_args
|
|
if self.mount_check and \
|
|
not os.path.ismount(os.path.join(self.root, drive)):
|
|
return Response(status='507 %s is not mounted' % drive)
|
|
db_file = os.path.join(self.root, drive,
|
|
storage_directory(self.datadir, partition, hsh),
|
|
hsh + '.db')
|
|
if op == 'rsync_then_merge':
|
|
return self.rsync_then_merge(drive, db_file, args)
|
|
if op == 'complete_rsync':
|
|
return self.complete_rsync(drive, db_file, args)
|
|
else:
|
|
# someone might be about to rsync a db to us,
|
|
# make sure there's a tmp dir to receive it.
|
|
mkdirs(os.path.join(self.root, drive, 'tmp'))
|
|
if not os.path.exists(db_file):
|
|
return HTTPNotFound()
|
|
return getattr(self, op)(self.broker_class(db_file), args)
|
|
|
|
def sync(self, broker, args):
|
|
(remote_sync, hash_, id_, created_at, put_timestamp,
|
|
delete_timestamp, metadata) = args
|
|
timemark = time.time()
|
|
try:
|
|
info = broker.get_replication_info()
|
|
except (Exception, Timeout), e:
|
|
if 'no such table' in str(e):
|
|
self.logger.error(_("Quarantining DB %s") % broker.db_file)
|
|
quarantine_db(broker.db_file, broker.db_type)
|
|
return HTTPNotFound()
|
|
raise
|
|
timespan = time.time() - timemark
|
|
if timespan > DEBUG_TIMINGS_THRESHOLD:
|
|
self.logger.debug(_('replicator-rpc-sync time for info: %.02fs') %
|
|
timespan)
|
|
if metadata:
|
|
timemark = time.time()
|
|
broker.update_metadata(simplejson.loads(metadata))
|
|
timespan = time.time() - timemark
|
|
if timespan > DEBUG_TIMINGS_THRESHOLD:
|
|
self.logger.debug(_('replicator-rpc-sync time for '
|
|
'update_metadata: %.02fs') % timespan)
|
|
if info['put_timestamp'] != put_timestamp or \
|
|
info['created_at'] != created_at or \
|
|
info['delete_timestamp'] != delete_timestamp:
|
|
timemark = time.time()
|
|
broker.merge_timestamps(
|
|
created_at, put_timestamp, delete_timestamp)
|
|
timespan = time.time() - timemark
|
|
if timespan > DEBUG_TIMINGS_THRESHOLD:
|
|
self.logger.debug(_('replicator-rpc-sync time for '
|
|
'merge_timestamps: %.02fs') % timespan)
|
|
timemark = time.time()
|
|
info['point'] = broker.get_sync(id_)
|
|
timespan = time.time() - timemark
|
|
if timespan > DEBUG_TIMINGS_THRESHOLD:
|
|
self.logger.debug(_('replicator-rpc-sync time for get_sync: '
|
|
'%.02fs') % timespan)
|
|
if hash_ == info['hash'] and info['point'] < remote_sync:
|
|
timemark = time.time()
|
|
broker.merge_syncs([{'remote_id': id_,
|
|
'sync_point': remote_sync}])
|
|
info['point'] = remote_sync
|
|
timespan = time.time() - timemark
|
|
if timespan > DEBUG_TIMINGS_THRESHOLD:
|
|
self.logger.debug(_('replicator-rpc-sync time for '
|
|
'merge_syncs: %.02fs') % timespan)
|
|
return Response(simplejson.dumps(info))
|
|
|
|
def merge_syncs(self, broker, args):
|
|
broker.merge_syncs(args[0])
|
|
return HTTPAccepted()
|
|
|
|
def merge_items(self, broker, args):
|
|
broker.merge_items(args[0], args[1])
|
|
return HTTPAccepted()
|
|
|
|
def complete_rsync(self, drive, db_file, args):
|
|
old_filename = os.path.join(self.root, drive, 'tmp', args[0])
|
|
if os.path.exists(db_file):
|
|
return HTTPNotFound()
|
|
if not os.path.exists(old_filename):
|
|
return HTTPNotFound()
|
|
broker = self.broker_class(old_filename)
|
|
broker.newid(args[0])
|
|
renamer(old_filename, db_file)
|
|
return HTTPNoContent()
|
|
|
|
def rsync_then_merge(self, drive, db_file, args):
|
|
old_filename = os.path.join(self.root, drive, 'tmp', args[0])
|
|
if not os.path.exists(db_file) or not os.path.exists(old_filename):
|
|
return HTTPNotFound()
|
|
new_broker = self.broker_class(old_filename)
|
|
existing_broker = self.broker_class(db_file)
|
|
point = -1
|
|
objects = existing_broker.get_items_since(point, 1000)
|
|
while len(objects):
|
|
new_broker.merge_items(objects)
|
|
point = objects[-1]['ROWID']
|
|
objects = existing_broker.get_items_since(point, 1000)
|
|
sleep()
|
|
new_broker.newid(args[0])
|
|
renamer(old_filename, db_file)
|
|
return HTTPNoContent()
|
|
|
|
# Footnote [1]:
|
|
# This orders the nodes so that, given nodes a b c, a will contact b then c,
|
|
# b will contact c then a, and c will contact a then b -- in other words, each
|
|
# node will always contact the next node in the list first.
|
|
# This helps in the case where databases are all way out of sync, so each
|
|
# node is likely to be sending to a different node than it's receiving from,
|
|
# rather than two nodes talking to each other, starving out the third.
|
|
# If the third didn't even have a copy and the first two nodes were way out
|
|
# of sync, such starvation would mean the third node wouldn't get any copy
|
|
# until the first two nodes finally got in sync, which could take a while.
|
|
# This new ordering ensures such starvation doesn't occur, making the data
|
|
# more durable.
|