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# 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.
from collections import defaultdict
import os
import errno
from os.path import isdir, isfile, join, dirname
import random
import shutil
import time
import itertools
from six import viewkeys
import six.moves.cPickle as pickle
from swift import gettext_ as _
import eventlet
from eventlet import GreenPool, queue, tpool, Timeout, sleep
from eventlet.green import subprocess
from swift.common.constraints import check_drive
from swift.common.ring.utils import is_local_device
from swift.common.utils import whataremyips, unlink_older_than, \
compute_eta, get_logger, dump_recon_cache, \
rsync_module_interpolation, mkdirs, config_true_value, \
config_auto_int_value, storage_directory, \
load_recon_cache, PrefixLoggerAdapter, parse_override_options, \
distribute_evenly
from swift.common.bufferedhttp import http_connect
from swift.common.daemon import Daemon
from swift.common.http import HTTP_OK, HTTP_INSUFFICIENT_STORAGE
from swift.obj import ssync_sender
from swift.obj.diskfile import get_data_dir, get_tmp_dir, DiskFileRouter
from swift.common.storage_policy import POLICIES, REPL_POLICY
DEFAULT_RSYNC_TIMEOUT = 900
def _do_listdir(partition, replication_cycle):
return (((partition + replication_cycle) % 10) == 0)
class Stats(object):
fields = ['attempted', 'failure', 'hashmatch', 'remove', 'rsync',
'success', 'suffix_count', 'suffix_hash', 'suffix_sync',
'failure_nodes']
@classmethod
def from_recon(cls, dct):
return cls(**{k: v for k, v in dct.items() if k in cls.fields})
def to_recon(self):
return {k: getattr(self, k) for k in self.fields}
def __init__(self, attempted=0, failure=0, hashmatch=0, remove=0, rsync=0,
success=0, suffix_count=0, suffix_hash=0,
suffix_sync=0, failure_nodes=None):
self.attempted = attempted
self.failure = failure
self.hashmatch = hashmatch
self.remove = remove
self.rsync = rsync
self.success = success
self.suffix_count = suffix_count
self.suffix_hash = suffix_hash
self.suffix_sync = suffix_sync
self.failure_nodes = defaultdict(lambda: defaultdict(int),
(failure_nodes or {}))
def __add__(self, other):
total = type(self)()
total.attempted = self.attempted + other.attempted
total.failure = self.failure + other.failure
total.hashmatch = self.hashmatch + other.hashmatch
total.remove = self.remove + other.remove
total.rsync = self.rsync + other.rsync
total.success = self.success + other.success
total.suffix_count = self.suffix_count + other.suffix_count
total.suffix_hash = self.suffix_hash + other.suffix_hash
total.suffix_sync = self.suffix_sync + other.suffix_sync
all_failed_ips = (set(self.failure_nodes.keys() +
other.failure_nodes.keys()))
for ip in all_failed_ips:
self_devs = self.failure_nodes.get(ip, {})
other_devs = other.failure_nodes.get(ip, {})
this_ip_failures = {}
for dev in set(self_devs.keys() + other_devs.keys()):
this_ip_failures[dev] = (
self_devs.get(dev, 0) + other_devs.get(dev, 0))
total.failure_nodes[ip] = this_ip_failures
return total
def add_failure_stats(self, failures):
"""
Note the failure of one or more devices.
:param failures: a list of (ip, device-name) pairs that failed
"""
self.failure += len(failures)
for ip, device in failures:
self.failure_nodes[ip][device] += 1
class ObjectReplicator(Daemon):
"""
Replicate objects.
Encapsulates most logic and data needed by the object replication process.
Each call to .replicate() performs one replication pass. It's up to the
caller to do this in a loop.
"""
def __init__(self, conf, logger=None):
"""
:param conf: configuration object obtained from ConfigParser
:param logger: logging object
"""
self.conf = conf
self.logger = PrefixLoggerAdapter(
logger or get_logger(conf, log_route='object-replicator'), {})
self.devices_dir = 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.bind_ip = conf.get('bind_ip', '0.0.0.0')
self.servers_per_port = int(conf.get('servers_per_port', '0') or 0)
self.port = None if self.servers_per_port else \
int(conf.get('bind_port', 6200))
self.concurrency = int(conf.get('concurrency', 1))
self.replicator_workers = int(conf.get('replicator_workers', 0))
self.stats_interval = int(conf.get('stats_interval', '300'))
self.ring_check_interval = int(conf.get('ring_check_interval', 15))
self.next_check = time.time() + self.ring_check_interval
self.replication_cycle = random.randint(0, 9)
self.partition_times = []
self.interval = int(conf.get('interval') or
conf.get('run_pause') or 30)
if 'run_pause' in conf and 'interval' not in conf:
self.logger.warning('Option object-replicator/run_pause '
'is deprecated and will be removed in a '
'future version. Update your configuration'
' to use option object-replicator/'
'interval.')
self.rsync_timeout = int(conf.get('rsync_timeout',
DEFAULT_RSYNC_TIMEOUT))
self.rsync_io_timeout = conf.get('rsync_io_timeout', '30')
self.rsync_bwlimit = conf.get('rsync_bwlimit', '0')
self.rsync_compress = config_true_value(
conf.get('rsync_compress', 'no'))
self.rsync_module = conf.get('rsync_module', '').rstrip('/')
if not self.rsync_module:
self.rsync_module = '{replication_ip}::object'
self.http_timeout = int(conf.get('http_timeout', 60))
self.recon_cache_path = conf.get('recon_cache_path',
'/var/cache/swift')
self.rcache = os.path.join(self.recon_cache_path, "object.recon")
self._next_rcache_update = time.time() + self.stats_interval
self.conn_timeout = float(conf.get('conn_timeout', 0.5))
self.node_timeout = float(conf.get('node_timeout', 10))
self.sync_method = getattr(self, conf.get('sync_method') or 'rsync')
self.network_chunk_size = int(conf.get('network_chunk_size', 65536))
self.default_headers = {
'Content-Length': '0',
'user-agent': 'object-replicator %s' % os.getpid()}
self.rsync_error_log_line_length = \
int(conf.get('rsync_error_log_line_length', 0))
self.handoffs_first = config_true_value(conf.get('handoffs_first',
False))
self.handoff_delete = config_auto_int_value(
conf.get('handoff_delete', 'auto'), 0)
if any((self.handoff_delete, self.handoffs_first)):
self.logger.warning('Handoff only mode is not intended for normal '
'operation, please disable handoffs_first and '
'handoff_delete before the next '
'normal rebalance')
self.is_multiprocess_worker = None
self._df_router = DiskFileRouter(conf, self.logger)
self._child_process_reaper_queue = queue.LightQueue()
def _zero_stats(self):
self.stats_for_dev = defaultdict(Stats)
@property
def total_stats(self):
return sum(self.stats_for_dev.values(), Stats())
def _emplace_log_prefix(self, worker_index):
self.logger.set_prefix("[worker %d/%d pid=%d] " % (
worker_index + 1, # use 1-based indexing for more readable logs
self.replicator_workers,
os.getpid()))
def _get_my_replication_ips(self):
my_replication_ips = set()
ips = whataremyips()
for policy in POLICIES:
self.load_object_ring(policy)
for local_dev in [dev for dev in policy.object_ring.devs
if dev and dev['replication_ip'] in ips and
dev['replication_port'] == self.port]:
my_replication_ips.add(local_dev['replication_ip'])
return list(my_replication_ips)
def _child_process_reaper(self):
"""
Consume processes from self._child_process_reaper_queue and wait() for
them
"""
procs = set()
done = False
while not done:
timeout = 60 if procs else None
try:
new_proc = self._child_process_reaper_queue.get(
timeout=timeout)
if new_proc is not None:
procs.add(new_proc)
else:
done = True
except queue.Empty:
pass
reaped_procs = set()
for proc in procs:
# this will reap the process if it has exited, but
# otherwise will not wait
if proc.poll() is not None:
reaped_procs.add(proc)
procs -= reaped_procs
def get_worker_args(self, once=False, **kwargs):
if self.replicator_workers < 1:
return []
override_opts = parse_override_options(once=once, **kwargs)
have_overrides = bool(override_opts.devices or override_opts.partitions
or override_opts.policies)
# save this off for ring-change detection later in is_healthy()
self.all_local_devices = self.get_local_devices()
if override_opts.devices:
devices_to_replicate = [
d for d in override_opts.devices
if d in self.all_local_devices]
else:
# The sort isn't strictly necessary since we're just trying to
# spread devices around evenly, but it makes testing easier.
devices_to_replicate = sorted(self.all_local_devices)
# Distribute devices among workers as evenly as possible
self.replicator_workers = min(self.replicator_workers,
len(devices_to_replicate))
return [{'override_devices': devs,
'override_partitions': override_opts.partitions,
'override_policies': override_opts.policies,
'have_overrides': have_overrides,
'multiprocess_worker_index': index}
for index, devs in enumerate(
distribute_evenly(devices_to_replicate,
self.replicator_workers))]
def is_healthy(self):
"""
Check whether our set of local devices remains the same.
If devices have been added or removed, then we return False here so
that we can kill off any worker processes and then distribute the
new set of local devices across a new set of workers so that all
devices are, once again, being worked on.
This function may also cause recon stats to be updated.
:returns: False if any local devices have been added or removed,
True otherwise
"""
# We update recon here because this is the only function we have in
# a multiprocess replicator that gets called periodically in the
# parent process.
if time.time() >= self._next_rcache_update:
update = self.aggregate_recon_update()
dump_recon_cache(update, self.rcache, self.logger)
return self.get_local_devices() == self.all_local_devices
def get_local_devices(self):
"""
Returns a set of all local devices in all replication-type storage
policies.
This is the device names, e.g. "sdq" or "d1234" or something, not
the full ring entries.
"""
ips = whataremyips(self.bind_ip)
local_devices = set()
for policy in POLICIES:
if policy.policy_type != REPL_POLICY:
continue
self.load_object_ring(policy)
for device in policy.object_ring.devs:
if device and is_local_device(
ips, self.port,
device['replication_ip'],
device['replication_port']):
local_devices.add(device['device'])
return local_devices
# Just exists for doc anchor point
def sync(self, node, job, suffixes, *args, **kwargs):
"""
Synchronize local suffix directories from a partition with a remote
node.
:param node: the "dev" entry for the remote node to sync with
:param job: information about the partition being synced
:param suffixes: a list of suffixes which need to be pushed
:returns: boolean and dictionary, boolean indicating success or failure
"""
return self.sync_method(node, job, suffixes, *args, **kwargs)
def load_object_ring(self, policy):
"""
Make sure the policy's rings are loaded.
:param policy: the StoragePolicy instance
:returns: appropriate ring object
"""
policy.load_ring(self.swift_dir)
return policy.object_ring
def _limit_rsync_log(self, line):
"""
If rsync_error_log_line_length is defined then
limit the error to that length
:param line: rsync log line
:return: If enabled the line limited to rsync_error_log_line_length
otherwise the initial line.
"""
if self.rsync_error_log_line_length:
return line[:self.rsync_error_log_line_length]
return line
def _rsync(self, args):
"""
Execute the rsync binary to replicate a partition.
:returns: return code of rsync process. 0 is successful
"""
start_time = time.time()
proc = None
try:
with Timeout(self.rsync_timeout):
proc = subprocess.Popen(args,
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT)
results = proc.stdout.read()
ret_val = proc.wait()
except Timeout:
self.logger.error(
self._limit_rsync_log(
_("Killing long-running rsync: %s") % str(args)))
if proc:
proc.kill()
try:
# Note: Python 2.7's subprocess.Popen class doesn't take
# any arguments for wait(), but Python 3's does.
# However, Eventlet's replacement Popen takes a timeout
# argument regardless of Python version, so we don't
# need any conditional code here.
proc.wait(timeout=1.0)
except subprocess.TimeoutExpired:
# Sometimes a process won't die immediately even after a
# SIGKILL. This can be due to failing disks, high load,
# or other reasons. We can't wait for it forever since
# we're taking up a slot in the (green)thread pool, so
# we send it over to another greenthread, not part of
# our pool, whose sole duty is to wait for child
# processes to exit.
self._child_process_reaper_queue.put(proc)
return 1 # failure response code
total_time = time.time() - start_time
for result in results.split('\n'):
if result == '':
continue
if result.startswith('cd+'):
continue
if not ret_val:
self.logger.info(result)
else:
self.logger.error(result)
if ret_val:
self.logger.error(
self._limit_rsync_log(
_('Bad rsync return code: %(ret)d <- %(args)s') %
{'args': str(args), 'ret': ret_val}))
else:
log_method = self.logger.info if results else self.logger.debug
log_method(
_("Successful rsync of %(src)s at %(dst)s (%(time).03f)"),
{'src': args[-2], 'dst': args[-1], 'time': total_time})
return ret_val
def rsync(self, node, job, suffixes):
"""
Uses rsync to implement the sync method. This was the first
sync method in Swift.
"""
if not os.path.exists(job['path']):
return False, {}
args = [
'rsync',
'--recursive',
'--whole-file',
'--human-readable',
'--xattrs',
'--itemize-changes',
'--ignore-existing',
'--timeout=%s' % self.rsync_io_timeout,
'--contimeout=%s' % self.rsync_io_timeout,
'--bwlimit=%s' % self.rsync_bwlimit,
'--exclude=.*.%s' % ''.join('[0-9a-zA-Z]' for i in range(6))
]
if self.rsync_compress and \
job['region'] != node['region']:
# Allow for compression, but only if the remote node is in
# a different region than the local one.
args.append('--compress')
rsync_module = rsync_module_interpolation(self.rsync_module, node)
had_any = False
for suffix in suffixes:
spath = join(job['path'], suffix)
if os.path.exists(spath):
args.append(spath)
had_any = True
if not had_any:
return False, {}
data_dir = get_data_dir(job['policy'])
args.append(join(rsync_module, node['device'],
data_dir, job['partition']))
return self._rsync(args) == 0, {}
def ssync(self, node, job, suffixes, remote_check_objs=None):
return ssync_sender.Sender(
self, node, job, suffixes, remote_check_objs)()
def check_ring(self, object_ring):
"""
Check to see if the ring has been updated
:param object_ring: the ring to check
:returns: boolean indicating whether or not the ring has changed
"""
if time.time() > self.next_check:
self.next_check = time.time() + self.ring_check_interval
if object_ring.has_changed():
return False
return True
def update_deleted(self, job):
"""
High-level method that replicates a single partition that doesn't
belong on this node.
:param job: a dict containing info about the partition to be replicated
"""
def tpool_get_suffixes(path):
return [suff for suff in os.listdir(path)
if len(suff) == 3 and isdir(join(path, suff))]
stats = self.stats_for_dev[job['device']]
stats.attempted += 1
self.logger.increment('partition.delete.count.%s' % (job['device'],))
headers = dict(self.default_headers)
headers['X-Backend-Storage-Policy-Index'] = int(job['policy'])
failure_devs_info = set()
begin = time.time()
handoff_partition_deleted = False
try:
responses = []
suffixes = tpool.execute(tpool_get_suffixes, job['path'])
synced_remote_regions = {}
delete_objs = None
if suffixes:
for node in job['nodes']:
stats.rsync += 1
kwargs = {}
if node['region'] in synced_remote_regions and \
self.conf.get('sync_method', 'rsync') == 'ssync':
kwargs['remote_check_objs'] = \
synced_remote_regions[node['region']]
# candidates is a dict(hash=>timestamp) of objects
# for deletion
success, candidates = self.sync(
node, job, suffixes, **kwargs)
if success:
with Timeout(self.http_timeout):
conn = http_connect(
node['replication_ip'],
node['replication_port'],
node['device'], job['partition'], 'REPLICATE',
'/' + '-'.join(suffixes), headers=headers)
conn.getresponse().read()
if node['region'] != job['region']:
synced_remote_regions[node['region']] = viewkeys(
candidates)
else:
failure_devs_info.add((node['replication_ip'],
node['device']))
responses.append(success)
for cand_objs in synced_remote_regions.values():
if delete_objs is None:
delete_objs = cand_objs
else:
delete_objs = delete_objs & cand_objs
if self.handoff_delete:
# delete handoff if we have had handoff_delete successes
delete_handoff = len([resp for resp in responses if resp]) >= \
self.handoff_delete
else:
# delete handoff if all syncs were successful
delete_handoff = len(responses) == len(job['nodes']) and \
all(responses)
if delete_handoff:
stats.remove += 1
if (self.conf.get('sync_method', 'rsync') == 'ssync' and
delete_objs is not None):
self.logger.info(_("Removing %s objects"),
len(delete_objs))
_junk, error_paths = self.delete_handoff_objs(
job, delete_objs)
# if replication works for a hand-off device and it failed,
# the remote devices which are target of the replication
# from the hand-off device will be marked. Because cleanup
# after replication failed means replicator needs to
# replicate again with the same info.
if error_paths:
failure_devs_info.update(
[(failure_dev['replication_ip'],
failure_dev['device'])
for failure_dev in job['nodes']])
else:
self.delete_partition(job['path'])
handoff_partition_deleted = True
elif not suffixes:
self.delete_partition(job['path'])
handoff_partition_deleted = True
except (Exception, Timeout):
self.logger.exception(_("Error syncing handoff partition"))
stats.add_failure_stats(failure_devs_info)
finally:
target_devs_info = set([(target_dev['replication_ip'],
target_dev['device'])
for target_dev in job['nodes']])
stats.success += len(target_devs_info - failure_devs_info)
if not handoff_partition_deleted:
self.handoffs_remaining += 1
self.partition_times.append(time.time() - begin)
self.logger.timing_since('partition.delete.timing', begin)
def delete_partition(self, path):
self.logger.info(_("Removing partition: %s"), path)
tpool.execute(shutil.rmtree, path)
def delete_handoff_objs(self, job, delete_objs):
success_paths = []
error_paths = []
for object_hash in delete_objs:
object_path = storage_directory(job['obj_path'], job['partition'],
object_hash)
tpool.execute(shutil.rmtree, object_path, ignore_errors=True)
suffix_dir = dirname(object_path)
try:
os.rmdir(suffix_dir)
success_paths.append(object_path)
except OSError as e:
if e.errno not in (errno.ENOENT, errno.ENOTEMPTY):
error_paths.append(object_path)
self.logger.exception(
"Unexpected error trying to cleanup suffix dir:%r",
suffix_dir)
return success_paths, error_paths
def update(self, job):
"""
High-level method that replicates a single partition.
:param job: a dict containing info about the partition to be replicated
"""
stats = self.stats_for_dev[job['device']]
stats.attempted += 1
self.logger.increment('partition.update.count.%s' % (job['device'],))
headers = dict(self.default_headers)
headers['X-Backend-Storage-Policy-Index'] = int(job['policy'])
target_devs_info = set()
failure_devs_info = set()
begin = time.time()
df_mgr = self._df_router[job['policy']]
try:
hashed, local_hash = tpool.execute(
df_mgr._get_hashes, job['device'],
job['partition'], job['policy'],
do_listdir=_do_listdir(
int(job['partition']),
self.replication_cycle))
stats.suffix_hash += hashed
self.logger.update_stats('suffix.hashes', hashed)
attempts_left = len(job['nodes'])
synced_remote_regions = set()
random.shuffle(job['nodes'])
nodes = itertools.chain(
job['nodes'],
job['policy'].object_ring.get_more_nodes(
int(job['partition'])))
while attempts_left > 0:
# If this throws StopIteration it will be caught way below
node = next(nodes)
target_devs_info.add((node['replication_ip'], node['device']))
attempts_left -= 1
# if we have already synced to this remote region,
# don't sync again on this replication pass
if node['region'] in synced_remote_regions:
continue
try:
with Timeout(self.http_timeout):
resp = http_connect(
node['replication_ip'], node['replication_port'],
node['device'], job['partition'], 'REPLICATE',
'', headers=headers).getresponse()
if resp.status == HTTP_INSUFFICIENT_STORAGE:
self.logger.error(
_('%(replication_ip)s/%(device)s '
'responded as unmounted'), node)
attempts_left += 1
failure_devs_info.add((node['replication_ip'],
node['device']))
continue
if resp.status != HTTP_OK:
self.logger.error(_("Invalid response %(resp)s "
"from %(ip)s"),
{'resp': resp.status,
'ip': node['replication_ip']})
failure_devs_info.add((node['replication_ip'],
node['device']))
continue
remote_hash = pickle.loads(resp.read())
del resp
suffixes = [suffix for suffix in local_hash if
local_hash[suffix] !=
remote_hash.get(suffix, -1)]
if not suffixes:
stats.hashmatch += 1
continue
hashed, recalc_hash = tpool.execute(
df_mgr._get_hashes,
job['device'], job['partition'], job['policy'],
recalculate=suffixes)
self.logger.update_stats('suffix.hashes', hashed)
local_hash = recalc_hash
suffixes = [suffix for suffix in local_hash if
local_hash[suffix] !=
remote_hash.get(suffix, -1)]
stats.rsync += 1
success, _junk = self.sync(node, job, suffixes)
with Timeout(self.http_timeout):
conn = http_connect(
node['replication_ip'], node['replication_port'],
node['device'], job['partition'], 'REPLICATE',
'/' + '-'.join(suffixes),
headers=headers)
conn.getresponse().read()
if not success:
failure_devs_info.add((node['replication_ip'],
node['device']))
# add only remote region when replicate succeeded
if success and node['region'] != job['region']:
synced_remote_regions.add(node['region'])
stats.suffix_sync += len(suffixes)
self.logger.update_stats('suffix.syncs', len(suffixes))
except (Exception, Timeout):
failure_devs_info.add((node['replication_ip'],
node['device']))
self.logger.exception(_("Error syncing with node: %s") %
node)
stats.suffix_count += len(local_hash)
except StopIteration:
self.logger.error('Ran out of handoffs while replicating '
'partition %s of policy %d',
job['partition'], int(job['policy']))
except (Exception, Timeout):
failure_devs_info.update(target_devs_info)
self.logger.exception(_("Error syncing partition"))
finally:
stats.add_failure_stats(failure_devs_info)
stats.success += len(target_devs_info - failure_devs_info)
self.partition_times.append(time.time() - begin)
self.logger.timing_since('partition.update.timing', begin)
def stats_line(self):
"""
Logs various stats for the currently running replication pass.
"""
stats = self.total_stats
replication_count = stats.attempted
if replication_count > self.last_replication_count:
self.last_replication_count = replication_count
elapsed = (time.time() - self.start) or 0.000001
rate = replication_count / elapsed
self.logger.info(
_("%(replicated)d/%(total)d (%(percentage).2f%%)"
" partitions replicated in %(time).2fs (%(rate).2f/sec, "
"%(remaining)s remaining)"),
{'replicated': replication_count, 'total': self.job_count,
'percentage': replication_count * 100.0 / self.job_count,
'time': time.time() - self.start, 'rate': rate,
'remaining': '%d%s' % compute_eta(self.start,
replication_count,
self.job_count)})
self.logger.info(_('%(success)s successes, %(failure)s failures')
% dict(success=stats.success,
failure=stats.failure))
if stats.suffix_count:
self.logger.info(
_("%(checked)d suffixes checked - "
"%(hashed).2f%% hashed, %(synced).2f%% synced"),
{'checked': stats.suffix_count,
'hashed':
(stats.suffix_hash * 100.0) / stats.suffix_count,
'synced':
(stats.suffix_sync * 100.0) / stats.suffix_count})
self.partition_times.sort()
self.logger.info(
_("Partition times: max %(max).4fs, "
"min %(min).4fs, med %(med).4fs"),
{'max': self.partition_times[-1],
'min': self.partition_times[0],
'med': self.partition_times[
len(self.partition_times) // 2]})
else:
self.logger.info(
_("Nothing replicated for %s seconds."),
(time.time() - self.start))
def heartbeat(self):
"""
Loop that runs in the background during replication. It periodically
logs progress.
"""
while True:
eventlet.sleep(self.stats_interval)
self.stats_line()
def build_replication_jobs(self, policy, ips, override_devices=None,
override_partitions=None):
"""
Helper function for collect_jobs to build jobs for replication
using replication style storage policy
"""
jobs = []
df_mgr = self._df_router[policy]
self.all_devs_info.update(
[(dev['replication_ip'], dev['device'])
for dev in policy.object_ring.devs if dev])
data_dir = get_data_dir(policy)
found_local = False
for local_dev in [dev for dev in policy.object_ring.devs
if (dev
and is_local_device(ips,
self.port,
dev['replication_ip'],
dev['replication_port'])
and (override_devices is None
or dev['device'] in override_devices))]:
found_local = True
local_dev_stats = self.stats_for_dev[local_dev['device']]
try:
dev_path = check_drive(self.devices_dir, local_dev['device'],
self.mount_check)
except ValueError as err:
local_dev_stats.add_failure_stats(
[(failure_dev['replication_ip'],
failure_dev['device'])
for failure_dev in policy.object_ring.devs
if failure_dev])
self.logger.warning("%s", err)
continue
obj_path = join(dev_path, data_dir)
tmp_path = join(dev_path, get_tmp_dir(policy))
unlink_older_than(tmp_path, time.time() -
df_mgr.reclaim_age)
if not os.path.exists(obj_path):
try:
mkdirs(obj_path)
except Exception:
self.logger.exception('ERROR creating %s' % obj_path)
continue
for partition in os.listdir(obj_path):
if (override_partitions is not None
and partition not in override_partitions):
continue
if (partition.startswith('auditor_status_') and
partition.endswith('.json')):
# ignore auditor status files
continue
part_nodes = None
try:
job_path = join(obj_path, partition)
part_nodes = policy.object_ring.get_part_nodes(
int(partition))
nodes = [node for node in part_nodes
if node['id'] != local_dev['id']]
jobs.append(
dict(path=job_path,
device=local_dev['device'],
obj_path=obj_path,
nodes=nodes,
delete=len(nodes) > len(part_nodes) - 1,
policy=policy,
partition=partition,
region=local_dev['region']))
except ValueError:
if part_nodes:
local_dev_stats.add_failure_stats(
[(failure_dev['replication_ip'],
failure_dev['device'])
for failure_dev in nodes])
else:
local_dev_stats.add_failure_stats(
[(failure_dev['replication_ip'],
failure_dev['device'])
for failure_dev in policy.object_ring.devs
if failure_dev])
continue
if not found_local:
self.logger.error("Can't find itself in policy with index %d with"
" ips %s and with port %s in ring file, not"
" replicating",
int(policy), ", ".join(ips), self.port)
return jobs
def collect_jobs(self, override_devices=None, override_partitions=None,
override_policies=None):
"""
Returns a sorted list of jobs (dictionaries) that specify the
partitions, nodes, etc to be rsynced.
:param override_devices: if set, only jobs on these devices
will be returned
:param override_partitions: if set, only jobs on these partitions
will be returned
:param override_policies: if set, only jobs in these storage
policies will be returned
"""
jobs = []
ips = whataremyips(self.bind_ip)
for policy in POLICIES:
# Skip replication if next_part_power is set. In this case
# every object is hard-linked twice, but the replicator can't
# detect them and would create a second copy of the file if not
# yet existing - and this might double the actual transferred
# and stored data
next_part_power = getattr(
policy.object_ring, 'next_part_power', None)
if next_part_power is not None:
self.logger.warning(
_("next_part_power set in policy '%s'. Skipping"),
policy.name)
continue
if policy.policy_type == REPL_POLICY:
if (override_policies is not None and
policy.idx not in override_policies):
continue
# ensure rings are loaded for policy
self.load_object_ring(policy)
jobs += self.build_replication_jobs(
policy, ips, override_devices=override_devices,
override_partitions=override_partitions)
random.shuffle(jobs)
if self.handoffs_first:
# Move the handoff parts to the front of the list
jobs.sort(key=lambda job: not job['delete'])
self.job_count = len(jobs)
return jobs
def replicate(self, override_devices=None, override_partitions=None,
override_policies=None, start_time=None):
"""Run a replication pass"""
if start_time is None:
start_time = time.time()
self.start = start_time
self.last_replication_count = 0
self.replication_cycle = (self.replication_cycle + 1) % 10
self.partition_times = []
self.my_replication_ips = self._get_my_replication_ips()
self.all_devs_info = set()
self.handoffs_remaining = 0
stats = eventlet.spawn(self.heartbeat)
eventlet.sleep() # Give spawns a cycle
current_nodes = None
dev_stats = None
num_jobs = 0
try:
self.run_pool = GreenPool(size=self.concurrency)
jobs = self.collect_jobs(override_devices=override_devices,
override_partitions=override_partitions,
override_policies=override_policies)
for job in jobs:
dev_stats = self.stats_for_dev[job['device']]
num_jobs += 1
current_nodes = job['nodes']
try:
check_drive(self.devices_dir, job['device'],
self.mount_check)
except ValueError as err:
dev_stats.add_failure_stats([
(failure_dev['replication_ip'], failure_dev['device'])
for failure_dev in job['nodes']])
self.logger.warning("%s", err)
continue
if self.handoffs_first and not job['delete']:
# in handoffs first mode, we won't process primary
# partitions until rebalance was successful!
if self.handoffs_remaining:
self.logger.warning(_(
"Handoffs first mode still has handoffs "
"remaining. Aborting current "
"replication pass."))
break
if not self.check_ring(job['policy'].object_ring):
self.logger.info(_("Ring change detected. Aborting "
"current replication pass."))
return
try:
if isfile(job['path']):
# Clean up any (probably zero-byte) files where a
# partition should be.
self.logger.warning(
'Removing partition directory '
'which was a file: %s', job['path'])
os.remove(job['path'])
continue
except OSError:
continue
if job['delete']:
self.run_pool.spawn(self.update_deleted, job)
else:
self.run_pool.spawn(self.update, job)
current_nodes = None
self.run_pool.waitall()
except (Exception, Timeout) as err:
if dev_stats:
if current_nodes:
dev_stats.add_failure_stats(
[(failure_dev['replication_ip'],
failure_dev['device'])
for failure_dev in current_nodes])
else:
dev_stats.add_failure_stats(self.all_devs_info)
self.logger.exception(
_("Exception in top-level replication loop: %s"), err)
finally:
stats.kill()
self.stats_line()
def update_recon(self, total, end_time, override_devices):
# Called at the end of a replication pass to update recon stats.
if self.is_multiprocess_worker:
# If it weren't for the failure_nodes field, we could do this as
# a bunch of shared memory using multiprocessing.Value, which
# would be nice because it'd avoid dealing with existing data
# during an upgrade.
update = {
'object_replication_per_disk': {
od: {'replication_stats':
self.stats_for_dev[od].to_recon(),
'replication_time': total,
'replication_last': end_time,
'object_replication_time': total,
'object_replication_last': end_time}
for od in override_devices}}
else:
update = {'replication_stats': self.total_stats.to_recon(),
'replication_time': total,
'replication_last': end_time,
'object_replication_time': total,
'object_replication_last': end_time}
dump_recon_cache(update, self.rcache, self.logger)
def aggregate_recon_update(self):
per_disk_stats = load_recon_cache(self.rcache).get(
'object_replication_per_disk', {})
recon_update = {}
min_repl_last = float('inf')
min_repl_time = float('inf')
# If every child has reported some stats, then aggregate things.
if all(ld in per_disk_stats for ld in self.all_local_devices):
aggregated = Stats()
for device_name, data in per_disk_stats.items():
aggregated += Stats.from_recon(data['replication_stats'])
min_repl_time = min(
min_repl_time, data['object_replication_time'])
min_repl_last = min(
min_repl_last, data['object_replication_last'])
recon_update['replication_stats'] = aggregated.to_recon()
recon_update['replication_last'] = min_repl_last
recon_update['replication_time'] = min_repl_time
recon_update['object_replication_last'] = min_repl_last
recon_update['object_replication_time'] = min_repl_time
# Clear out entries for old local devices that we no longer have
devices_to_remove = set(per_disk_stats) - set(self.all_local_devices)
if devices_to_remove:
recon_update['object_replication_per_disk'] = {
dtr: {} for dtr in devices_to_remove}
return recon_update
def run_once(self, multiprocess_worker_index=None,
have_overrides=False, *args, **kwargs):
if multiprocess_worker_index is not None:
self.is_multiprocess_worker = True
self._emplace_log_prefix(multiprocess_worker_index)
rsync_reaper = eventlet.spawn(self._child_process_reaper)
self._zero_stats()
self.logger.info(_("Running object replicator in script mode."))
override_opts = parse_override_options(once=True, **kwargs)
devices = override_opts.devices or None
partitions = override_opts.partitions or None
policies = override_opts.policies or None
start_time = time.time()
self.replicate(
override_devices=devices,
override_partitions=partitions,
override_policies=policies,
start_time=start_time)
end_time = time.time()
total = (end_time - start_time) / 60
self.logger.info(
_("Object replication complete (once). (%.02f minutes)"), total)
# If we've been manually run on a subset of
# policies/devices/partitions, then our recon stats are not
# representative of how replication is doing, so we don't publish
# them.
if self.is_multiprocess_worker:
# The main process checked for overrides and determined that
# there were none
should_update_recon = not have_overrides
else:
# We are single-process, so update recon only if we worked on
# everything
should_update_recon = not (partitions or devices or policies)
if should_update_recon:
self.update_recon(total, end_time, devices)
# Give rsync processes one last chance to exit, then bail out and
# let them be init's problem
self._child_process_reaper_queue.put(None)
rsync_reaper.wait()
def run_forever(self, multiprocess_worker_index=None,
override_devices=None, *args, **kwargs):
if multiprocess_worker_index is not None:
self.is_multiprocess_worker = True
self._emplace_log_prefix(multiprocess_worker_index)
self.logger.info(_("Starting object replicator in daemon mode."))
eventlet.spawn_n(self._child_process_reaper)
# Run the replicator continually
while True:
self._zero_stats()
self.logger.info(_("Starting object replication pass."))
# Run the replicator
start = time.time()
self.replicate(override_devices=override_devices)
end = time.time()
total = (end - start) / 60
self.logger.info(
_("Object replication complete. (%.02f minutes)"), total)
self.update_recon(total, end, override_devices)
self.logger.debug('Replication sleeping for %s seconds.',
self.interval)
sleep(self.interval)
def post_multiprocess_run(self):
# This method is called after run_once using multiple workers.
update = self.aggregate_recon_update()
dump_recon_cache(update, self.rcache, self.logger)