/usr/lib/python2.7/dist-packages/swift/obj/reconstructor.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
from os.path import join
import random
import time
import itertools
from collections import defaultdict
import six
import six.moves.cPickle as pickle
import shutil
from eventlet import (GreenPile, GreenPool, Timeout, sleep, hubs, tpool,
spawn)
from eventlet.support.greenlets import GreenletExit
from swift import gettext_ as _
from swift.common.utils import (
whataremyips, unlink_older_than, compute_eta, get_logger,
dump_recon_cache, mkdirs, config_true_value, list_from_csv, get_hub,
tpool_reraise, GreenAsyncPile, Timestamp, remove_file)
from swift.common.header_key_dict import HeaderKeyDict
from swift.common.bufferedhttp import http_connect
from swift.common.daemon import Daemon
from swift.common.ring.utils import is_local_device
from swift.obj.ssync_sender import Sender as ssync_sender
from swift.common.http import HTTP_OK, HTTP_NOT_FOUND, \
HTTP_INSUFFICIENT_STORAGE
from swift.obj.diskfile import DiskFileRouter, get_data_dir, \
get_tmp_dir
from swift.common.storage_policy import POLICIES, EC_POLICY
from swift.common.exceptions import ConnectionTimeout, DiskFileError, \
SuffixSyncError
SYNC, REVERT = ('sync_only', 'sync_revert')
hubs.use_hub(get_hub())
def _get_partners(frag_index, part_nodes):
"""
Returns the left and right partners of the node whose index is
equal to the given frag_index.
:param frag_index: a fragment index
:param part_nodes: a list of primary nodes
:returns: [<node-to-left>, <node-to-right>]
"""
return [
part_nodes[(frag_index - 1) % len(part_nodes)],
part_nodes[(frag_index + 1) % len(part_nodes)],
]
class RebuildingECDiskFileStream(object):
"""
This class wraps the the reconstructed fragment archive data and
metadata in the DiskFile interface for ssync.
"""
def __init__(self, datafile_metadata, frag_index, rebuilt_fragment_iter):
# start with metadata from a participating FA
self.datafile_metadata = datafile_metadata
# the new FA is going to have the same length as others in the set
self._content_length = self.datafile_metadata['Content-Length']
# update the FI and delete the ETag, the obj server will
# recalc on the other side...
self.datafile_metadata['X-Object-Sysmeta-Ec-Frag-Index'] = frag_index
for etag_key in ('ETag', 'Etag'):
self.datafile_metadata.pop(etag_key, None)
self.frag_index = frag_index
self.rebuilt_fragment_iter = rebuilt_fragment_iter
def get_metadata(self):
return self.datafile_metadata
def get_datafile_metadata(self):
return self.datafile_metadata
@property
def content_length(self):
return self._content_length
def reader(self):
for chunk in self.rebuilt_fragment_iter:
yield chunk
class ObjectReconstructor(Daemon):
"""
Reconstruct objects using erasure code. And also rebalance EC Fragment
Archive objects off handoff nodes.
Encapsulates most logic and data needed by the object reconstruction
process. Each call to .reconstruct() performs one 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 = logger or get_logger(
conf, log_route='object-reconstructor')
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', 6000))
self.concurrency = int(conf.get('concurrency', 1))
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.reclaim_age = int(conf.get('reclaim_age', 86400 * 7))
self.partition_times = []
self.interval = int(conf.get('interval') or
conf.get('run_pause') or 30)
self.http_timeout = int(conf.get('http_timeout', 60))
self.lockup_timeout = int(conf.get('lockup_timeout', 1800))
self.recon_cache_path = conf.get('recon_cache_path',
'/var/cache/swift')
self.rcache = os.path.join(self.recon_cache_path, "object.recon")
# defaults subject to change after beta
self.conn_timeout = float(conf.get('conn_timeout', 0.5))
self.node_timeout = float(conf.get('node_timeout', 10))
self.network_chunk_size = int(conf.get('network_chunk_size', 65536))
self.disk_chunk_size = int(conf.get('disk_chunk_size', 65536))
self.headers = {
'Content-Length': '0',
'user-agent': 'obj-reconstructor %s' % os.getpid()}
self.handoffs_first = config_true_value(conf.get('handoffs_first',
False))
self._df_router = DiskFileRouter(conf, self.logger)
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 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 _full_path(self, node, part, path, policy):
return '%(replication_ip)s:%(replication_port)s' \
'/%(device)s/%(part)s%(path)s ' \
'policy#%(policy)d frag#%(frag_index)s' % {
'replication_ip': node['replication_ip'],
'replication_port': node['replication_port'],
'device': node['device'],
'part': part, 'path': path,
'policy': policy,
'frag_index': node.get('index', 'handoff'),
}
def _get_response(self, node, part, path, headers, policy):
"""
Helper method for reconstruction that GETs a single EC fragment
archive
:param node: the node to GET from
:param part: the partition
:param path: full path of the desired EC archive
:param headers: the headers to send
:param policy: an instance of
:class:`~swift.common.storage_policy.BaseStoragePolicy`
:returns: response
"""
resp = None
try:
with ConnectionTimeout(self.conn_timeout):
conn = http_connect(node['ip'], node['port'], node['device'],
part, 'GET', path, headers=headers)
with Timeout(self.node_timeout):
resp = conn.getresponse()
if resp.status not in [HTTP_OK, HTTP_NOT_FOUND]:
self.logger.warning(
_("Invalid response %(resp)s from %(full_path)s"),
{'resp': resp.status,
'full_path': self._full_path(node, part, path, policy)})
resp = None
elif resp.status == HTTP_NOT_FOUND:
resp = None
except (Exception, Timeout):
self.logger.exception(
_("Trying to GET %(full_path)s"), {
'full_path': self._full_path(node, part, path, policy)})
return resp
def reconstruct_fa(self, job, node, datafile_metadata):
"""
Reconstructs a fragment archive - this method is called from ssync
after a remote node responds that is missing this object - the local
diskfile is opened to provide metadata - but to reconstruct the
missing fragment archive we must connect to multiple object servers.
:param job: job from ssync_sender
:param node: node that we're rebuilding to
:param datafile_metadata: the datafile metadata to attach to
the rebuilt fragment archive
:returns: a DiskFile like class for use by ssync
:raises DiskFileError: if the fragment archive cannot be reconstructed
"""
part_nodes = job['policy'].object_ring.get_part_nodes(
job['partition'])
part_nodes.remove(node)
# the fragment index we need to reconstruct is the position index
# of the node we're rebuilding to within the primary part list
fi_to_rebuild = node['index']
# KISS send out connection requests to all nodes, see what sticks
headers = self.headers.copy()
headers['X-Backend-Storage-Policy-Index'] = int(job['policy'])
pile = GreenAsyncPile(len(part_nodes))
path = datafile_metadata['name']
for node in part_nodes:
pile.spawn(self._get_response, node, job['partition'],
path, headers, job['policy'])
responses = []
etag = None
for resp in pile:
if not resp:
continue
resp.headers = HeaderKeyDict(resp.getheaders())
if str(fi_to_rebuild) == \
resp.headers.get('X-Object-Sysmeta-Ec-Frag-Index'):
continue
if resp.headers.get('X-Object-Sysmeta-Ec-Frag-Index') in set(
r.headers.get('X-Object-Sysmeta-Ec-Frag-Index')
for r in responses):
continue
responses.append(resp)
etag = sorted(responses, reverse=True,
key=lambda r: Timestamp(
r.headers.get('X-Backend-Timestamp')
))[0].headers.get('X-Object-Sysmeta-Ec-Etag')
responses = [r for r in responses if
r.headers.get('X-Object-Sysmeta-Ec-Etag') == etag]
if len(responses) >= job['policy'].ec_ndata:
break
else:
self.logger.error(
'Unable to get enough responses (%s/%s) '
'to reconstruct %s with ETag %s' % (
len(responses), job['policy'].ec_ndata,
self._full_path(node, job['partition'],
datafile_metadata['name'], job['policy']),
etag))
raise DiskFileError('Unable to reconstruct EC archive')
rebuilt_fragment_iter = self.make_rebuilt_fragment_iter(
responses[:job['policy'].ec_ndata], path, job['policy'],
fi_to_rebuild)
return RebuildingECDiskFileStream(datafile_metadata, fi_to_rebuild,
rebuilt_fragment_iter)
def _reconstruct(self, policy, fragment_payload, frag_index):
return policy.pyeclib_driver.reconstruct(fragment_payload,
[frag_index])[0]
def make_rebuilt_fragment_iter(self, responses, path, policy, frag_index):
"""
Turn a set of connections from backend object servers into a generator
that yields up the rebuilt fragment archive for frag_index.
"""
def _get_one_fragment(resp):
buff = ''
remaining_bytes = policy.fragment_size
while remaining_bytes:
chunk = resp.read(remaining_bytes)
if not chunk:
break
remaining_bytes -= len(chunk)
buff += chunk
return buff
def fragment_payload_iter():
# We need a fragment from each connections, so best to
# use a GreenPile to keep them ordered and in sync
pile = GreenPile(len(responses))
while True:
for resp in responses:
pile.spawn(_get_one_fragment, resp)
try:
with Timeout(self.node_timeout):
fragment_payload = [fragment for fragment in pile]
except (Exception, Timeout):
self.logger.exception(
_("Error trying to rebuild %(path)s "
"policy#%(policy)d frag#%(frag_index)s"),
{'path': path,
'policy': policy,
'frag_index': frag_index,
})
break
if not all(fragment_payload):
break
rebuilt_fragment = self._reconstruct(
policy, fragment_payload, frag_index)
yield rebuilt_fragment
return fragment_payload_iter()
def stats_line(self):
"""
Logs various stats for the currently running reconstruction pass.
"""
if (self.device_count and self.part_count and
self.reconstruction_device_count):
elapsed = (time.time() - self.start) or 0.000001
rate = self.reconstruction_part_count / elapsed
total_part_count = (self.part_count *
self.device_count /
self.reconstruction_device_count)
self.logger.info(
_("%(reconstructed)d/%(total)d (%(percentage).2f%%)"
" partitions of %(device)d/%(dtotal)d "
"(%(dpercentage).2f%%) devices"
" reconstructed in %(time).2fs "
"(%(rate).2f/sec, %(remaining)s remaining)"),
{'reconstructed': self.reconstruction_part_count,
'total': self.part_count,
'percentage':
self.reconstruction_part_count * 100.0 / self.part_count,
'device': self.reconstruction_device_count,
'dtotal': self.device_count,
'dpercentage':
self.reconstruction_device_count * 100.0 / self.device_count,
'time': time.time() - self.start, 'rate': rate,
'remaining': '%d%s' %
compute_eta(self.start,
self.reconstruction_part_count,
total_part_count)})
if self.suffix_count and self.partition_times:
self.logger.info(
_("%(checked)d suffixes checked - "
"%(hashed).2f%% hashed, %(synced).2f%% synced"),
{'checked': self.suffix_count,
'hashed': (self.suffix_hash * 100.0) / self.suffix_count,
'synced': (self.suffix_sync * 100.0) / self.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 reconstructed for %s seconds."),
(time.time() - self.start))
def kill_coros(self):
"""Utility function that kills all coroutines currently running."""
for coro in list(self.run_pool.coroutines_running):
try:
coro.kill(GreenletExit)
except GreenletExit:
pass
def heartbeat(self):
"""
Loop that runs in the background during reconstruction. It
periodically logs progress.
"""
while True:
sleep(self.stats_interval)
self.stats_line()
def detect_lockups(self):
"""
In testing, the pool.waitall() call very occasionally failed to return.
This is an attempt to make sure the reconstructor finishes its
reconstruction pass in some eventuality.
"""
while True:
sleep(self.lockup_timeout)
if self.reconstruction_count == self.last_reconstruction_count:
self.logger.error(_("Lockup detected.. killing live coros."))
self.kill_coros()
self.last_reconstruction_count = self.reconstruction_count
def _get_hashes(self, policy, path, recalculate=None, do_listdir=False):
df_mgr = self._df_router[policy]
hashed, suffix_hashes = tpool_reraise(
df_mgr._get_hashes, path, recalculate=recalculate,
do_listdir=do_listdir, reclaim_age=self.reclaim_age)
self.logger.update_stats('suffix.hashes', hashed)
return suffix_hashes
def get_suffix_delta(self, local_suff, local_index,
remote_suff, remote_index):
"""
Compare the local suffix hashes with the remote suffix hashes
for the given local and remote fragment indexes. Return those
suffixes which should be synced.
:param local_suff: the local suffix hashes (from _get_hashes)
:param local_index: the local fragment index for the job
:param remote_suff: the remote suffix hashes (from remote
REPLICATE request)
:param remote_index: the remote fragment index for the job
:returns: a list of strings, the suffix dirs to sync
"""
suffixes = []
for suffix, sub_dict_local in local_suff.items():
sub_dict_remote = remote_suff.get(suffix, {})
if (sub_dict_local.get(None) != sub_dict_remote.get(None) or
sub_dict_local.get(local_index) !=
sub_dict_remote.get(remote_index)):
suffixes.append(suffix)
return suffixes
def rehash_remote(self, node, job, suffixes):
try:
with Timeout(self.http_timeout):
conn = http_connect(
node['replication_ip'], node['replication_port'],
node['device'], job['partition'], 'REPLICATE',
'/' + '-'.join(sorted(suffixes)),
headers=self.headers)
conn.getresponse().read()
except (Exception, Timeout):
self.logger.exception(
_("Trying to sync suffixes with %s") % self._full_path(
node, job['partition'], '', job['policy']))
def _get_suffixes_to_sync(self, job, node):
"""
For SYNC jobs we need to make a remote REPLICATE request to get
the remote node's current suffix's hashes and then compare to our
local suffix's hashes to decide which suffixes (if any) are out
of sync.
:param: the job dict, with the keys defined in ``_get_part_jobs``
:param node: the remote node dict
:returns: a (possibly empty) list of strings, the suffixes to be
synced with the remote node.
"""
# get hashes from the remote node
remote_suffixes = None
try:
with Timeout(self.http_timeout):
resp = http_connect(
node['replication_ip'], node['replication_port'],
node['device'], job['partition'], 'REPLICATE',
'', headers=self.headers).getresponse()
if resp.status == HTTP_INSUFFICIENT_STORAGE:
self.logger.error(
_('%s responded as unmounted'),
self._full_path(node, job['partition'], '',
job['policy']))
elif resp.status != HTTP_OK:
full_path = self._full_path(node, job['partition'], '',
job['policy'])
self.logger.error(
_("Invalid response %(resp)s from %(full_path)s"),
{'resp': resp.status, 'full_path': full_path})
else:
remote_suffixes = pickle.loads(resp.read())
except (Exception, Timeout):
# all exceptions are logged here so that our caller can
# safely catch our exception and continue to the next node
# without logging
self.logger.exception('Unable to get remote suffix hashes '
'from %r' % self._full_path(
node, job['partition'], '',
job['policy']))
if remote_suffixes is None:
raise SuffixSyncError('Unable to get remote suffix hashes')
suffixes = self.get_suffix_delta(job['hashes'],
job['frag_index'],
remote_suffixes,
node['index'])
# now recalculate local hashes for suffixes that don't
# match so we're comparing the latest
local_suff = self._get_hashes(job['policy'], job['path'],
recalculate=suffixes)
suffixes = self.get_suffix_delta(local_suff,
job['frag_index'],
remote_suffixes,
node['index'])
self.suffix_count += len(suffixes)
return suffixes
def delete_reverted_objs(self, job, objects, frag_index):
"""
For EC we can potentially revert only some of a partition
so we'll delete reverted objects here. Note that we delete
the fragment index of the file we sent to the remote node.
:param job: the job being processed
:param objects: a dict of objects to be deleted, each entry maps
hash=>timestamp
:param frag_index: (int) the fragment index of data files to be deleted
"""
df_mgr = self._df_router[job['policy']]
for object_hash, timestamps in objects.items():
try:
df = df_mgr.get_diskfile_from_hash(
job['local_dev']['device'], job['partition'],
object_hash, job['policy'],
frag_index=frag_index)
df.purge(timestamps['ts_data'], frag_index)
except DiskFileError:
self.logger.exception(
'Unable to purge DiskFile (%r %r %r)',
object_hash, timestamps['ts_data'], frag_index)
continue
def process_job(self, job):
"""
Sync the local partition with the remote node(s) according to
the parameters of the job. For primary nodes, the SYNC job type
will define both left and right hand sync_to nodes to ssync with
as defined by this primary nodes index in the node list based on
the fragment index found in the partition. For non-primary
nodes (either handoff revert, or rebalance) the REVERT job will
define a single node in sync_to which is the proper/new home for
the fragment index.
N.B. ring rebalancing can be time consuming and handoff nodes'
fragment indexes do not have a stable order, it's possible to
have more than one REVERT job for a partition, and in some rare
failure conditions there may even also be a SYNC job for the
same partition - but each one will be processed separately
because each job will define a separate list of node(s) to
'sync_to'.
:param: the job dict, with the keys defined in ``_get_job_info``
"""
self.headers['X-Backend-Storage-Policy-Index'] = int(job['policy'])
begin = time.time()
if job['job_type'] == REVERT:
self._revert(job, begin)
else:
self._sync(job, begin)
self.partition_times.append(time.time() - begin)
self.reconstruction_count += 1
def _sync(self, job, begin):
"""
Process a SYNC job.
"""
self.logger.increment(
'partition.update.count.%s' % (job['local_dev']['device'],))
# after our left and right partners, if there's some sort of
# failure we'll continue onto the remaining primary nodes and
# make sure they're in sync - or potentially rebuild missing
# fragments we find
dest_nodes = itertools.chain(
job['sync_to'],
# I think we could order these based on our index to better
# protect against a broken chain
[
n for n in
job['policy'].object_ring.get_part_nodes(job['partition'])
if n['id'] != job['local_dev']['id'] and
n['id'] not in (m['id'] for m in job['sync_to'])
],
)
syncd_with = 0
for node in dest_nodes:
if syncd_with >= len(job['sync_to']):
# success!
break
try:
suffixes = self._get_suffixes_to_sync(job, node)
except SuffixSyncError:
continue
if not suffixes:
syncd_with += 1
continue
# ssync any out-of-sync suffixes with the remote node
success, _ = ssync_sender(
self, node, job, suffixes)()
# let remote end know to rehash it's suffixes
self.rehash_remote(node, job, suffixes)
# update stats for this attempt
self.suffix_sync += len(suffixes)
self.logger.update_stats('suffix.syncs', len(suffixes))
if success:
syncd_with += 1
self.logger.timing_since('partition.update.timing', begin)
def _revert(self, job, begin):
"""
Process a REVERT job.
"""
self.logger.increment(
'partition.delete.count.%s' % (job['local_dev']['device'],))
# we'd desperately like to push this partition back to it's
# primary location, but if that node is down, the next best thing
# is one of the handoff locations - which *might* be us already!
dest_nodes = itertools.chain(
job['sync_to'],
job['policy'].object_ring.get_more_nodes(job['partition']),
)
syncd_with = 0
reverted_objs = {}
for node in dest_nodes:
if syncd_with >= len(job['sync_to']):
break
if node['id'] == job['local_dev']['id']:
# this is as good a place as any for this data for now
break
success, in_sync_objs = ssync_sender(
self, node, job, job['suffixes'])()
self.rehash_remote(node, job, job['suffixes'])
if success:
syncd_with += 1
reverted_objs.update(in_sync_objs)
if syncd_with >= len(job['sync_to']):
self.delete_reverted_objs(
job, reverted_objs, job['frag_index'])
self.logger.timing_since('partition.delete.timing', begin)
def _get_part_jobs(self, local_dev, part_path, partition, policy):
"""
Helper function to build jobs for a partition, this method will
read the suffix hashes and create job dictionaries to describe
the needed work. There will be one job for each fragment index
discovered in the partition.
For a fragment index which corresponds to this node's ring
index, a job with job_type SYNC will be created to ensure that
the left and right hand primary ring nodes for the part have the
corresponding left and right hand fragment archives.
A fragment index (or entire partition) for which this node is
not the primary corresponding node, will create job(s) with
job_type REVERT to ensure that fragment archives are pushed to
the correct node and removed from this one.
A partition may result in multiple jobs. Potentially many
REVERT jobs, and zero or one SYNC job.
:param local_dev: the local device
:param part_path: full path to partition
:param partition: partition number
:param policy: the policy
:returns: a list of dicts of job info
"""
# find all the fi's in the part, and which suffixes have them
hashes = self._get_hashes(policy, part_path, do_listdir=True)
non_data_fragment_suffixes = []
data_fi_to_suffixes = defaultdict(list)
for suffix, fi_hash in hashes.items():
if not fi_hash:
# this is for sanity and clarity, normally an empty
# suffix would get del'd from the hashes dict, but an
# OSError trying to re-hash the suffix could leave the
# value empty - it will log the exception; but there's
# no way to properly address this suffix at this time.
continue
data_frag_indexes = [f for f in fi_hash if f is not None]
if not data_frag_indexes:
non_data_fragment_suffixes.append(suffix)
else:
for fi in data_frag_indexes:
data_fi_to_suffixes[fi].append(suffix)
# helper to ensure consistent structure of jobs
def build_job(job_type, frag_index, suffixes, sync_to):
return {
'job_type': job_type,
'frag_index': frag_index,
'suffixes': suffixes,
'sync_to': sync_to,
'partition': partition,
'path': part_path,
'hashes': hashes,
'policy': policy,
'local_dev': local_dev,
# ssync likes to have it handy
'device': local_dev['device'],
}
# aggregate jobs for all the fragment index in this part
jobs = []
# check the primary nodes - to see if the part belongs here
part_nodes = policy.object_ring.get_part_nodes(partition)
for node in part_nodes:
if node['id'] == local_dev['id']:
# this partition belongs here, we'll need a sync job
frag_index = node['index']
try:
suffixes = data_fi_to_suffixes.pop(frag_index)
except KeyError:
suffixes = []
sync_job = build_job(
job_type=SYNC,
frag_index=frag_index,
suffixes=suffixes,
sync_to=_get_partners(frag_index, part_nodes),
)
# ssync callback to rebuild missing fragment_archives
sync_job['sync_diskfile_builder'] = self.reconstruct_fa
jobs.append(sync_job)
break
# assign remaining data fragment suffixes to revert jobs
ordered_fis = sorted((len(suffixes), fi) for fi, suffixes
in data_fi_to_suffixes.items())
for count, fi in ordered_fis:
revert_job = build_job(
job_type=REVERT,
frag_index=fi,
suffixes=data_fi_to_suffixes[fi],
sync_to=[part_nodes[fi]],
)
jobs.append(revert_job)
# now we need to assign suffixes that have no data fragments
if non_data_fragment_suffixes:
if jobs:
# the first job will be either the sync_job, or the
# revert_job for the fragment index that is most common
# among the suffixes
jobs[0]['suffixes'].extend(non_data_fragment_suffixes)
else:
# this is an unfortunate situation, we need a revert job to
# push partitions off this node, but none of the suffixes
# have any data fragments to hint at which node would be a
# good candidate to receive the tombstones.
jobs.append(build_job(
job_type=REVERT,
frag_index=None,
suffixes=non_data_fragment_suffixes,
# this is super safe
sync_to=part_nodes,
# something like this would be probably be better
# sync_to=random.sample(part_nodes, 3),
))
# return a list of jobs for this part
return jobs
def collect_parts(self, override_devices=None,
override_partitions=None):
"""
Helper for yielding partitions in the top level reconstructor
"""
override_devices = override_devices or []
override_partitions = override_partitions or []
ips = whataremyips(self.bind_ip)
for policy in POLICIES:
if policy.policy_type != EC_POLICY:
continue
self._diskfile_mgr = self._df_router[policy]
self.load_object_ring(policy)
data_dir = get_data_dir(policy)
local_devices = list(six.moves.filter(
lambda dev: dev and is_local_device(
ips, self.port,
dev['replication_ip'], dev['replication_port']),
policy.object_ring.devs))
if override_devices:
self.device_count = len(override_devices)
else:
self.device_count = len(local_devices)
for local_dev in local_devices:
if override_devices and (local_dev['device'] not in
override_devices):
continue
self.reconstruction_device_count += 1
dev_path = self._df_router[policy].get_dev_path(
local_dev['device'])
if not dev_path:
self.logger.warning(_('%s is not mounted'),
local_dev['device'])
continue
obj_path = join(dev_path, data_dir)
tmp_path = join(dev_path, get_tmp_dir(int(policy)))
unlink_older_than(tmp_path, time.time() -
self.reclaim_age)
if not os.path.exists(obj_path):
try:
mkdirs(obj_path)
except Exception:
self.logger.exception(
'Unable to create %s' % obj_path)
continue
try:
partitions = os.listdir(obj_path)
except OSError:
self.logger.exception(
'Unable to list partitions in %r' % obj_path)
continue
self.part_count += len(partitions)
for partition in partitions:
part_path = join(obj_path, partition)
if not (partition.isdigit() and
os.path.isdir(part_path)):
self.logger.warning(
'Unexpected entity in data dir: %r' % part_path)
remove_file(part_path)
self.reconstruction_part_count += 1
continue
partition = int(partition)
if override_partitions and (partition not in
override_partitions):
continue
part_info = {
'local_dev': local_dev,
'policy': policy,
'partition': partition,
'part_path': part_path,
}
yield part_info
self.reconstruction_part_count += 1
def build_reconstruction_jobs(self, part_info):
"""
Helper function for collect_jobs to build jobs for reconstruction
using EC style storage policy
"""
jobs = self._get_part_jobs(**part_info)
random.shuffle(jobs)
if self.handoffs_first:
# Move the handoff revert jobs to the front of the list
jobs.sort(key=lambda job: job['job_type'], reverse=True)
self.job_count += len(jobs)
return jobs
def _reset_stats(self):
self.start = time.time()
self.job_count = 0
self.part_count = 0
self.device_count = 0
self.suffix_count = 0
self.suffix_sync = 0
self.suffix_hash = 0
self.reconstruction_count = 0
self.reconstruction_part_count = 0
self.reconstruction_device_count = 0
self.last_reconstruction_count = -1
def delete_partition(self, path):
self.logger.info(_("Removing partition: %s"), path)
tpool.execute(shutil.rmtree, path, ignore_errors=True)
def reconstruct(self, **kwargs):
"""Run a reconstruction pass"""
self._reset_stats()
self.partition_times = []
stats = spawn(self.heartbeat)
lockup_detector = spawn(self.detect_lockups)
sleep() # Give spawns a cycle
try:
self.run_pool = GreenPool(size=self.concurrency)
for part_info in self.collect_parts(**kwargs):
if not self.check_ring(part_info['policy'].object_ring):
self.logger.info(_("Ring change detected. Aborting "
"current reconstruction pass."))
return
jobs = self.build_reconstruction_jobs(part_info)
if not jobs:
# If this part belongs on this node, _get_part_jobs
# will *always* build a sync_job - even if there's
# no suffixes in the partition that needs to sync.
# If there's any suffixes in the partition then our
# job list would have *at least* one revert job.
# Therefore we know this part a) doesn't belong on
# this node and b) doesn't have any suffixes in it.
self.run_pool.spawn(self.delete_partition,
part_info['part_path'])
for job in jobs:
self.run_pool.spawn(self.process_job, job)
with Timeout(self.lockup_timeout):
self.run_pool.waitall()
except (Exception, Timeout):
self.logger.exception(_("Exception in top-level"
"reconstruction loop"))
self.kill_coros()
finally:
stats.kill()
lockup_detector.kill()
self.stats_line()
def run_once(self, *args, **kwargs):
start = time.time()
self.logger.info(_("Running object reconstructor in script mode."))
override_devices = list_from_csv(kwargs.get('devices'))
override_partitions = [int(p) for p in
list_from_csv(kwargs.get('partitions'))]
self.reconstruct(
override_devices=override_devices,
override_partitions=override_partitions)
total = (time.time() - start) / 60
self.logger.info(
_("Object reconstruction complete (once). (%.02f minutes)"), total)
if not (override_partitions or override_devices):
dump_recon_cache({'object_reconstruction_time': total,
'object_reconstruction_last': time.time()},
self.rcache, self.logger)
def run_forever(self, *args, **kwargs):
self.logger.info(_("Starting object reconstructor in daemon mode."))
# Run the reconstructor continually
while True:
start = time.time()
self.logger.info(_("Starting object reconstruction pass."))
# Run the reconstructor
self.reconstruct()
total = (time.time() - start) / 60
self.logger.info(
_("Object reconstruction complete. (%.02f minutes)"), total)
dump_recon_cache({'object_reconstruction_time': total,
'object_reconstruction_last': time.time()},
self.rcache, self.logger)
self.logger.debug('reconstruction sleeping for %s seconds.',
self.interval)
sleep(self.interval)
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