/usr/lib/python2.7/dist-packages/swift/container/replicator.py is in python-swift 2.7.0-0ubuntu2.
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#
# 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 os
import itertools
import json
import time
from collections import defaultdict
from eventlet import Timeout
from swift.container.sync_store import ContainerSyncStore
from swift.container.backend import ContainerBroker, DATADIR
from swift.container.reconciler import (
MISPLACED_OBJECTS_ACCOUNT, incorrect_policy_index,
get_reconciler_container_name, get_row_to_q_entry_translator)
from swift.common import db_replicator
from swift.common.storage_policy import POLICIES
from swift.common.exceptions import DeviceUnavailable
from swift.common.http import is_success
from swift.common.db import DatabaseAlreadyExists
from swift.common.utils import (Timestamp, hash_path,
storage_directory, quorum_size)
class ContainerReplicator(db_replicator.Replicator):
server_type = 'container'
brokerclass = ContainerBroker
datadir = DATADIR
default_port = 6001
def report_up_to_date(self, full_info):
reported_key_map = {
'reported_put_timestamp': 'put_timestamp',
'reported_delete_timestamp': 'delete_timestamp',
'reported_bytes_used': 'bytes_used',
'reported_object_count': 'count',
}
for reported, value_key in reported_key_map.items():
if full_info[reported] != full_info[value_key]:
return False
return True
def _gather_sync_args(self, replication_info):
parent = super(ContainerReplicator, self)
sync_args = parent._gather_sync_args(replication_info)
if len(POLICIES) > 1:
sync_args += tuple(replication_info[k] for k in
('status_changed_at', 'count',
'storage_policy_index'))
return sync_args
def _handle_sync_response(self, node, response, info, broker, http,
different_region):
parent = super(ContainerReplicator, self)
if is_success(response.status):
remote_info = json.loads(response.data)
if incorrect_policy_index(info, remote_info):
status_changed_at = Timestamp(time.time())
broker.set_storage_policy_index(
remote_info['storage_policy_index'],
timestamp=status_changed_at.internal)
sync_timestamps = ('created_at', 'put_timestamp',
'delete_timestamp')
if any(info[key] != remote_info[key] for key in sync_timestamps):
broker.merge_timestamps(*(remote_info[key] for key in
sync_timestamps))
rv = parent._handle_sync_response(
node, response, info, broker, http, different_region)
return rv
def find_local_handoff_for_part(self, part):
"""
Look through devices in the ring for the first handoff device that was
identified during job creation as available on this node.
:returns: a node entry from the ring
"""
nodes = self.ring.get_part_nodes(part)
more_nodes = self.ring.get_more_nodes(part)
for node in itertools.chain(nodes, more_nodes):
if node['id'] in self._local_device_ids:
return node
return None
def get_reconciler_broker(self, timestamp):
"""
Get a local instance of the reconciler container broker that is
appropriate to enqueue the given timestamp.
:param timestamp: the timestamp of the row to be enqueued
:returns: a local reconciler broker
"""
container = get_reconciler_container_name(timestamp)
if self.reconciler_containers and \
container in self.reconciler_containers:
return self.reconciler_containers[container][1]
account = MISPLACED_OBJECTS_ACCOUNT
part = self.ring.get_part(account, container)
node = self.find_local_handoff_for_part(part)
if not node:
raise DeviceUnavailable(
'No mounted devices found suitable to Handoff reconciler '
'container %s in partition %s' % (container, part))
hsh = hash_path(account, container)
db_dir = storage_directory(DATADIR, part, hsh)
db_path = os.path.join(self.root, node['device'], db_dir, hsh + '.db')
broker = ContainerBroker(db_path, account=account, container=container)
if not os.path.exists(broker.db_file):
try:
broker.initialize(timestamp, 0)
except DatabaseAlreadyExists:
pass
if self.reconciler_containers is not None:
self.reconciler_containers[container] = part, broker, node['id']
return broker
def feed_reconciler(self, container, item_list):
"""
Add queue entries for rows in item_list to the local reconciler
container database.
:param container: the name of the reconciler container
:param item_list: the list of rows to enqueue
:returns: True if successfully enqueued
"""
try:
reconciler = self.get_reconciler_broker(container)
except DeviceUnavailable as e:
self.logger.warning('DeviceUnavailable: %s', e)
return False
self.logger.debug('Adding %d objects to the reconciler at %s',
len(item_list), reconciler.db_file)
try:
reconciler.merge_items(item_list)
except (Exception, Timeout):
self.logger.exception('UNHANDLED EXCEPTION: trying to merge '
'%d items to reconciler container %s',
len(item_list), reconciler.db_file)
return False
return True
def dump_to_reconciler(self, broker, point):
"""
Look for object rows for objects updates in the wrong storage policy
in broker with a ``ROWID`` greater than the rowid given as point.
:param broker: the container broker with misplaced objects
:param point: the last verified ``reconciler_sync_point``
:returns: the last successful enqueued rowid
"""
max_sync = broker.get_max_row()
misplaced = broker.get_misplaced_since(point, self.per_diff)
if not misplaced:
return max_sync
translator = get_row_to_q_entry_translator(broker)
errors = False
low_sync = point
while misplaced:
batches = defaultdict(list)
for item in misplaced:
container = get_reconciler_container_name(item['created_at'])
batches[container].append(translator(item))
for container, item_list in batches.items():
success = self.feed_reconciler(container, item_list)
if not success:
errors = True
point = misplaced[-1]['ROWID']
if not errors:
low_sync = point
misplaced = broker.get_misplaced_since(point, self.per_diff)
return low_sync
def _post_replicate_hook(self, broker, info, responses):
if info['account'] == MISPLACED_OBJECTS_ACCOUNT:
return
try:
self.sync_store.update_sync_store(broker)
except Exception:
self.logger.exception('Failed to update sync_store %s' %
broker.db_file)
point = broker.get_reconciler_sync()
if not broker.has_multiple_policies() and info['max_row'] != point:
broker.update_reconciler_sync(info['max_row'])
return
max_sync = self.dump_to_reconciler(broker, point)
success = responses.count(True) >= quorum_size(len(responses))
if max_sync > point and success:
# to be safe, only slide up the sync point with a quorum on
# replication
broker.update_reconciler_sync(max_sync)
def delete_db(self, broker):
"""
Ensure that reconciler databases are only cleaned up at the end of the
replication run.
"""
if (self.reconciler_cleanups is not None and
broker.account == MISPLACED_OBJECTS_ACCOUNT):
# this container shouldn't be here, make sure it's cleaned up
self.reconciler_cleanups[broker.container] = broker
return
try:
# DB is going to get deleted. Be preemptive about it
self.sync_store.remove_synced_container(broker)
except Exception:
self.logger.exception('Failed to remove sync_store entry %s' %
broker.db_file)
return super(ContainerReplicator, self).delete_db(broker)
def replicate_reconcilers(self):
"""
Ensure any items merged to reconciler containers during replication
are pushed out to correct nodes and any reconciler containers that do
not belong on this node are removed.
"""
self.logger.info('Replicating %d reconciler containers',
len(self.reconciler_containers))
for part, reconciler, node_id in self.reconciler_containers.values():
self.cpool.spawn_n(
self._replicate_object, part, reconciler.db_file, node_id)
self.cpool.waitall()
# wipe out the cache do disable bypass in delete_db
cleanups = self.reconciler_cleanups
self.reconciler_cleanups = self.reconciler_containers = None
self.logger.info('Cleaning up %d reconciler containers',
len(cleanups))
for reconciler in cleanups.values():
self.cpool.spawn_n(self.delete_db, reconciler)
self.cpool.waitall()
self.logger.info('Finished reconciler replication')
def run_once(self, *args, **kwargs):
self.reconciler_containers = {}
self.reconciler_cleanups = {}
self.sync_store = ContainerSyncStore(self.root,
self.logger,
self.mount_check)
rv = super(ContainerReplicator, self).run_once(*args, **kwargs)
if any([self.reconciler_containers, self.reconciler_cleanups]):
self.replicate_reconcilers()
return rv
class ContainerReplicatorRpc(db_replicator.ReplicatorRpc):
def _parse_sync_args(self, args):
parent = super(ContainerReplicatorRpc, self)
remote_info = parent._parse_sync_args(args)
if len(args) > 9:
remote_info['status_changed_at'] = args[7]
remote_info['count'] = args[8]
remote_info['storage_policy_index'] = args[9]
return remote_info
def _get_synced_replication_info(self, broker, remote_info):
"""
Sync the remote_info storage_policy_index if needed and return the
newly synced replication info.
:param broker: the database broker
:param remote_info: the remote replication info
:returns: local broker replication info
"""
info = broker.get_replication_info()
if incorrect_policy_index(info, remote_info):
status_changed_at = Timestamp(time.time()).internal
broker.set_storage_policy_index(
remote_info['storage_policy_index'],
timestamp=status_changed_at)
info = broker.get_replication_info()
return info
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