def relink(swift_dir='/etc/swift',
devices='/srv/node',
skip_mount_check=False,
logger=logging.getLogger(),
device=None):
mount_check = not skip_mount_check
run = False
relinked = errors = 0
for policy in POLICIES:
policy.object_ring = None # Ensure it will be reloaded
policy.load_ring(swift_dir)
part_power = policy.object_ring.part_power
next_part_power = policy.object_ring.next_part_power
if not next_part_power or next_part_power == part_power:
continue
logging.info('Relinking files for policy %s under %s', policy.name,
devices)
run = True
datadir = diskfile.get_data_dir(policy)
locks = [None]
states = {}
relink_devices_filter = partial(devices_filter, device)
relink_hook_pre_device = partial(hook_pre_device, locks, states,
datadir)
relink_hook_post_device = partial(hook_post_device, locks)
relink_partition_filter = partial(partitions_filter, states,
STEP_RELINK, part_power,
next_part_power)
relink_hook_post_partition = partial(hook_post_partition, states,
STEP_RELINK)
relink_hashes_filter = partial(hashes_filter, next_part_power)
locations = audit_location_generator(
devices,
datadir,
mount_check=mount_check,
devices_filter=relink_devices_filter,
hook_pre_device=relink_hook_pre_device,
hook_post_device=relink_hook_post_device,
partitions_filter=relink_partition_filter,
hook_post_partition=relink_hook_post_partition,
hashes_filter=relink_hashes_filter)
for fname, _, _ in locations:
newfname = replace_partition_in_path(fname, next_part_power)
try:
diskfile.relink_paths(fname, newfname, check_existing=True)
relinked += 1
except OSError as exc:
errors += 1
logger.warning("Relinking %s to %s failed: %s", fname,
newfname, exc)
if not run:
logger.warning("No policy found to increase the partition power.")
return 2
logging.info('Relinked %d diskfiles (%d errors)', relinked, errors)
if errors > 0:
return 1
return 0
def relink(swift_dir='/etc/swift',
devices='/srv/node',
skip_mount_check=False,
logger=logging.getLogger()):
mount_check = not skip_mount_check
run = False
relinked = errors = 0
for policy in POLICIES:
policy.object_ring = None # Ensure it will be reloaded
policy.load_ring(swift_dir)
part_power = policy.object_ring.part_power
next_part_power = policy.object_ring.next_part_power
if not next_part_power or next_part_power == part_power:
continue
logging.info('Relinking files for policy %s under %s',
policy.name, devices)
run = True
locations = audit_location_generator(
devices,
diskfile.get_data_dir(policy),
mount_check=mount_check)
for fname, _, _ in locations:
newfname = replace_partition_in_path(fname, next_part_power)
try:
diskfile.relink_paths(fname, newfname, check_existing=True)
relinked += 1
except OSError as exc:
errors += 1
logger.warning("Relinking %s to %s failed: %s",
fname, newfname, exc)
if not run:
logger.warning("No policy found to increase the partition power.")
return 2
logging.info('Relinked %d diskfiles (%d errors)', relinked, errors)
if errors > 0:
return 1
return 0
def check_existing(self, new_file):
existing_link = None
link_created = False
start = self.next_part_power - 1
stop = max(start - self.conf['link_check_limit'], -1)
for check_part_power in range(start, stop, -1):
# Try to create the link from each of several previous part power
# locations. If an attempt succeeds then either a link was made or
# an existing link with the same inode as the next part power
# location was found: either is acceptable. The part power location
# that previously failed with EEXIST is included in the further
# attempts here for simplicity.
target_file = replace_partition_in_path(
self.conf['devices'], new_file, check_part_power)
try:
link_created = diskfile.relink_paths(target_file, new_file,
ignore_missing=False)
existing_link = target_file
break
except OSError:
pass
return existing_link, link_created
def process_location(self, hash_path, new_hash_path):
# Compare the contents of each hash dir with contents of same hash
# dir in its new partition to verify that the new location has the
# most up to date set of files. The new location may have newer
# files if it has been updated since relinked.
self.stats['hash_dirs'] += 1
# Get on disk data for new and old locations, cleaning up any
# reclaimable or obsolete files in each. The new location is
# cleaned up *before* the old location to prevent false negatives
# where the old still has a file that has been cleaned up in the
# new; cleaning up the new location first ensures that the old will
# always be 'cleaner' than the new.
new_df_data = self.diskfile_mgr.cleanup_ondisk_files(new_hash_path)
old_df_data = self.diskfile_mgr.cleanup_ondisk_files(hash_path)
# Now determine the most up to date set of on disk files would be
# given the content of old and new locations...
new_files = set(new_df_data['files'])
old_files = set(old_df_data['files'])
union_files = new_files.union(old_files)
union_data = self.diskfile_mgr.get_ondisk_files(union_files,
'',
verify=False)
obsolete_files = set(info['filename']
for info in union_data.get('obsolete', []))
# drop 'obsolete' files but retain 'unexpected' files which might
# be misplaced diskfiles from another policy
required_files = union_files.difference(obsolete_files)
required_links = required_files.intersection(old_files)
missing_links = 0
created_links = 0
unwanted_files = []
for filename in required_links:
# Before removing old files, be sure that the corresponding
# required new files exist by calling relink_paths again. There
# are several possible outcomes:
# - The common case is that the new file exists, in which case
# relink_paths checks that the new file has the same inode
# as the old file. An exception is raised if the inode of
# the new file is not the same as the old file.
# - The new file may not exist because the relinker failed to
# create the link to the old file and has erroneously moved
# on to cleanup. In this case the relink_paths will create
# the link now or raise an exception if that fails.
# - The new file may not exist because some other process,
# such as an object server handling a request, has cleaned
# it up since we called cleanup_ondisk_files(new_hash_path).
# In this case a new link will be created to the old file.
# This is unnecessary but simpler than repeating the
# evaluation of what links are now required and safer than
# assuming that a non-existent file that *was* required is
# no longer required. The new file will eventually be
# cleaned up again.
self.stats['files'] += 1
old_file = os.path.join(hash_path, filename)
new_file = os.path.join(new_hash_path, filename)
try:
if diskfile.relink_paths(old_file, new_file):
self.logger.debug("Relinking%s created link: %s to %s",
' (cleanup)' if self.do_cleanup else '',
old_file, new_file)
created_links += 1
self.stats['linked'] += 1
except OSError as exc:
if exc.errno == errno.EEXIST and filename.endswith('.ts'):
# special case for duplicate tombstones, see:
# https://bugs.launchpad.net/swift/+bug/1921718
# https://bugs.launchpad.net/swift/+bug/1934142
self.logger.debug(
"Relinking%s: tolerating different inodes for "
"tombstone with same timestamp: %s to %s",
' (cleanup)' if self.do_cleanup else '', old_file,
new_file)
else:
self.logger.warning(
"Error relinking%s: failed to relink %s to %s: %s",
' (cleanup)' if self.do_cleanup else '', old_file,
new_file, exc)
self.stats['errors'] += 1
missing_links += 1
if created_links:
self.linked_into_partitions.add(
get_partition_from_path(self.conf['devices'], new_hash_path))
try:
diskfile.invalidate_hash(os.path.dirname(new_hash_path))
except (Exception, LockTimeout) as exc:
# at this point, the link's created. even if we counted it as
# an error, a subsequent run wouldn't find any work to do. so,
# don't bother; instead, wait for replication to be re-enabled
# so post-replication rehashing or periodic rehashing can
# eventually pick up the change
self.logger.warning('Error invalidating suffix for %s: %r',
new_hash_path, exc)
if self.do_cleanup and not missing_links:
# use the sorted list to help unit testing
unwanted_files = old_df_data['files']
# the new partition hash dir has the most up to date set of on
# disk files so it is safe to delete the old location...
rehash = False
for filename in unwanted_files:
old_file = os.path.join(hash_path, filename)
try:
os.remove(old_file)
except OSError as exc:
self.logger.warning('Error cleaning up %s: %r', old_file, exc)
self.stats['errors'] += 1
else:
rehash = True
self.stats['removed'] += 1
self.logger.debug("Removed %s", old_file)
if rehash:
# Even though we're invalidating the suffix, don't update
# self.linked_into_partitions -- we only care about them for
# relinking into the new part-power space
try:
diskfile.invalidate_hash(os.path.dirname(hash_path))
except (Exception, LockTimeout) as exc:
# note: not counted as an error
self.logger.warning('Error invalidating suffix for %s: %r',
hash_path, exc)
def relink(conf, logger, device):
diskfile_router = diskfile.DiskFileRouter(conf, logger)
found_policy = False
relinked = errors = 0
error_counter = {}
for policy in POLICIES:
diskfile_mgr = diskfile_router[policy]
policy.object_ring = None # Ensure it will be reloaded
policy.load_ring(conf['swift_dir'])
part_power = policy.object_ring.part_power
next_part_power = policy.object_ring.next_part_power
if not next_part_power or next_part_power == part_power:
continue
logger.info('Relinking files for policy %s under %s', policy.name,
conf['devices'])
found_policy = True
datadir = diskfile.get_data_dir(policy)
locks = [None]
states = {
"part_power": part_power,
"next_part_power": next_part_power,
"state": {},
}
relink_devices_filter = partial(devices_filter, device)
relink_hook_pre_device = partial(hook_pre_device, locks, states,
datadir)
relink_hook_post_device = partial(hook_post_device, locks)
relink_partition_filter = partial(partitions_filter, states,
part_power, next_part_power)
relink_hook_post_partition = partial(hook_post_partition, states,
STEP_RELINK, policy, diskfile_mgr)
relink_hashes_filter = partial(hashes_filter, next_part_power)
locations = audit_location_generator(
conf['devices'],
datadir,
mount_check=conf['mount_check'],
devices_filter=relink_devices_filter,
hook_pre_device=relink_hook_pre_device,
hook_post_device=relink_hook_post_device,
partitions_filter=relink_partition_filter,
hook_post_partition=relink_hook_post_partition,
hashes_filter=relink_hashes_filter,
logger=logger,
error_counter=error_counter)
if conf['files_per_second'] > 0:
locations = RateLimitedIterator(locations,
conf['files_per_second'])
for fname, _, _ in locations:
newfname = replace_partition_in_path(fname, next_part_power)
try:
diskfile.relink_paths(fname, newfname, check_existing=True)
relinked += 1
suffix_dir = os.path.dirname(os.path.dirname(newfname))
diskfile.invalidate_hash(suffix_dir)
except OSError as exc:
errors += 1
logger.warning("Relinking %s to %s failed: %s", fname,
newfname, exc)
return determine_exit_code(
logger=logger,
found_policy=found_policy,
processed=relinked,
action='relinked',
action_errors=errors,
error_counter=error_counter,
)
def process_location(self, hash_path, new_hash_path):
# Compare the contents of each hash dir with contents of same hash
# dir in its new partition to verify that the new location has the
# most up to date set of files. The new location may have newer
# files if it has been updated since relinked.
self.stats['hash_dirs'] += 1
# Get on disk data for new and old locations, cleaning up any
# reclaimable or obsolete files in each. The new location is
# cleaned up *before* the old location to prevent false negatives
# where the old still has a file that has been cleaned up in the
# new; cleaning up the new location first ensures that the old will
# always be 'cleaner' than the new.
new_df_data = self.diskfile_mgr.cleanup_ondisk_files(new_hash_path)
old_df_data = self.diskfile_mgr.cleanup_ondisk_files(hash_path)
# Now determine the most up to date set of on disk files would be
# given the content of old and new locations...
new_files = set(new_df_data['files'])
old_files = set(old_df_data['files'])
union_files = new_files.union(old_files)
union_data = self.diskfile_mgr.get_ondisk_files(
union_files, '', verify=False)
obsolete_files = set(info['filename']
for info in union_data.get('obsolete', []))
# drop 'obsolete' files but retain 'unexpected' files which might
# be misplaced diskfiles from another policy
required_files = union_files.difference(obsolete_files)
required_links = required_files.intersection(old_files)
missing_links = 0
created_links = 0
unwanted_files = []
for filename in required_links:
# Before removing old files, be sure that the corresponding
# required new files exist by calling relink_paths again. There
# are several possible outcomes:
# - The common case is that the new file exists, in which case
# relink_paths checks that the new file has the same inode
# as the old file. An exception is raised if the inode of
# the new file is not the same as the old file.
# - The new file may not exist because the relinker failed to
# create the link to the old file and has erroneously moved
# on to cleanup. In this case the relink_paths will create
# the link now or raise an exception if that fails.
# - The new file may not exist because some other process,
# such as an object server handling a request, has cleaned
# it up since we called cleanup_ondisk_files(new_hash_path).
# In this case a new link will be created to the old file.
# This is unnecessary but simpler than repeating the
# evaluation of what links are now required and safer than
# assuming that a non-existent file that *was* required is
# no longer required. The new file will eventually be
# cleaned up again.
self.stats['files'] += 1
old_file = os.path.join(hash_path, filename)
new_file = os.path.join(new_hash_path, filename)
try:
if diskfile.relink_paths(old_file, new_file):
self.logger.debug(
"Relinking%s created link: %s to %s",
' (cleanup)' if self.do_cleanup else '',
old_file, new_file)
created_links += 1
self.stats['linked'] += 1
except OSError as exc:
existing_link = None
link_created = False
if exc.errno == errno.EEXIST and filename.endswith('.ts'):
# special case for duplicate tombstones in older partition
# power locations
# (https://bugs.launchpad.net/swift/+bug/1921718)
existing_link, link_created = self.check_existing(new_file)
if existing_link:
self.logger.debug(
"Relinking%s: link not needed: %s to %s due to "
"existing %s", ' (cleanup)' if self.do_cleanup else '',
old_file, new_file, existing_link)
if link_created:
# uncommon case: the retry succeeded in creating a link
created_links += 1
self.stats['linked'] += 1
wanted_file = replace_partition_in_path(
self.conf['devices'], old_file, self.part_power)
if old_file not in (existing_link, wanted_file):
# A link exists to a different file and this file
# is not the current target for client requests. If
# this file is visited again it is possible that
# the existing_link will have been cleaned up and
# the check will fail, so clean it up now.
self.logger.info(
"Relinking%s: cleaning up unwanted file: %s",
' (cleanup)' if self.do_cleanup else '', old_file)
unwanted_files.append(filename)
else:
self.logger.warning(
"Error relinking%s: failed to relink %s to %s: %s",
' (cleanup)' if self.do_cleanup else '',
old_file, new_file, exc)
self.stats['errors'] += 1
missing_links += 1
if created_links:
diskfile.invalidate_hash(os.path.dirname(new_hash_path))
if self.do_cleanup and not missing_links:
# use the sorted list to help unit testing
unwanted_files = old_df_data['files']
# the new partition hash dir has the most up to date set of on
# disk files so it is safe to delete the old location...
rehash = False
for filename in unwanted_files:
old_file = os.path.join(hash_path, filename)
try:
os.remove(old_file)
except OSError as exc:
self.logger.warning('Error cleaning up %s: %r', old_file, exc)
self.stats['errors'] += 1
else:
rehash = True
self.stats['removed'] += 1
self.logger.debug("Removed %s", old_file)
if rehash:
try:
diskfile.invalidate_hash(os.path.dirname(hash_path))
except Exception as exc:
# note: not counted as an error
self.logger.warning(
'Error invalidating suffix for %s: %r',
hash_path, exc)