def _timeout_for_bytesize(cls, bytes):
r"""Calculate the expected timeout depending on the message length.
>>> f = ChunksMessage._timeout_for_bytesize
>>> f(0) # 0 bytes - 1 minute
datetime.timedelta(0, 60)
>>> f(1024) # 1 kb - ~1 minute
datetime.timedelta(0, 60, 62500)
>>> f(1024 * 1024) # 1 Mb ~ 2 minutes 4 seconds
datetime.timedelta(0, 124)
>>> f(1024 * 1024 * 63) # 63 Mb ~ 1 hour 8 minutes 12 seconds
datetime.timedelta(0, 4092)
@param bytes: the length (in bytes).
@type bytes: numbers.Integral
@rtype: timedelta
"""
total_size_kb = round_up_to_multiply(bytes, 1024) // 1024
# On 128 kbit/s, the upload speed will be...
# let's think it will be 16 kbytes/s.
return timedelta(minutes=1) \
+ timedelta(seconds=1) * total_size_kb // 16
def _timeout_for_bytesize(cls, bytes):
r"""Calculate the expected timeout depending on the message length.
>>> f = ChunksMessage._timeout_for_bytesize
>>> f(0) # 0 bytes - 1 minute
datetime.timedelta(0, 60)
>>> f(1024) # 1 kb - ~1 minute
datetime.timedelta(0, 60, 62500)
>>> f(1024 * 1024) # 1 Mb ~ 2 minutes 4 seconds
datetime.timedelta(0, 124)
>>> f(1024 * 1024 * 63) # 63 Mb ~ 1 hour 8 minutes 12 seconds
datetime.timedelta(0, 4092)
@param bytes: the length (in bytes).
@type bytes: numbers.Integral
@rtype: timedelta
"""
total_size_kb = round_up_to_multiply(bytes, 1024) // 1024
# On 128 kbit/s, the upload speed will be...
# let's think it will be 16 kbytes/s.
return timedelta(minutes=1) \
+ timedelta(seconds=1) * total_size_kb // 16
def _incoming_chunks_body_received(self, data):
"""
@todo: What if the "since" field is too old?
"""
assert self.is_incoming(), repr(self)
sender = self.message.src
chunks = self.message.chunks
_chunk_lengths_iter = (ch.phys_size() for ch in chunks)
logger.verbose('Received %i chunk(s) from %r: %r',
len(chunks) if chunks else 0, sender, chunks)
# Check if the chunks were expected...
exp_chunk_tuples = [
HostQueries.HostChunks.get_expected_chunk(_chunk.uuid, sender.uuid)
for _chunk in chunks
]
byte_size_to_wipe = 0
for _chunk_len, exp_chunk_tuple in izip(_chunk_lengths_iter,
exp_chunk_tuples):
doing_replication_not_restore = exp_chunk_tuple is None or \
not exp_chunk_tuple.restore_flag
# But if it was the dummy replication chunk,
# we need to free some space by killing some dummy chunks.
if doing_replication_not_restore:
byte_size_to_wipe += _chunk_len
# Now really cleanup some dummy chunks
if byte_size_to_wipe != 0:
how_many_chunks_to_wipe = \
round_up_to_multiply(byte_size_to_wipe, 0x100000) // 0x100000
logger.debug('Before writing chunks body: wiping %i chunks',
how_many_chunks_to_wipe)
self.manager.app.chunk_storage.delete_some_dummy_chunks(
how_many_chunks_to_wipe)
# Let's consider it successful for the phase of chunks writing,
# unless even a single chunk fails to write.
overall_success = True
# And finally, loop over the chunks and write their bodies.
for _chunk, exp_chunk_tuple in izip(chunks, exp_chunk_tuples):
_chunk_uuid = _chunk.uuid
_expected_hash = _chunk.hash
_actual_hash = _chunk.hash_from_body
if _expected_hash != _actual_hash:
logger.error(
'Chunk %s has hash %s rather than %s; '
'writing this for now, but someday '
'might need to fix it to prevent '
'the cloud/deduplication clogging '
'with the unreadable files.', _chunk_uuid,
binascii.hexlify(_actual_hash),
binascii.hexlify(_expected_hash))
logger.debug('Writing chunk %r', _chunk)
try:
self.manager.app.chunk_storage.write_chunk(_chunk,
is_dummy=False)
except Exception:
logger.exception(
'Could not store the incoming chunk %r; '
'will be considered as failed', _chunk)
overall_success = False
else: # written successfully
if exp_chunk_tuple is not None:
# This is an expected chunk, either replication
# (restore_flag = False)
# or restore-related (restore_flag = True) one.
logger.debug(
'Received unexpected chunk %r from %r, '
'meeting expectation (%s)', _chunk_uuid, sender.uuid,
exp_chunk_tuple.restore_flag)
HostQueries.HostChunks.meet_expectations(
_chunk_uuid, sender.uuid, exp_chunk_tuple.restore_flag)
else:
# This is an unexpected chunk,
# assume it is a replication
logger.debug(
'Received unexpected chunk %r from %r, '
'assume replication', _chunk_uuid, sender)
# If something failed before this moment, the default value of
# C{incoming_success} of False will consider the transaction failed.
with self.open_state(for_update=True) as state:
state.incoming_success = overall_success
logger.debug('Overall success of %r is %r', self, overall_success)
# At the very end, regenerate back the dummy chunks, if needed.
logger.debug('After writing chunk body: recalculating dummy chunks')
self.manager.app.chunk_storage.update_dummy_chunks_size()
def _incoming_chunks_body_received(self, data):
"""
@todo: What if the "since" field is too old?
"""
assert self.is_incoming(), repr(self)
sender = self.message.src
chunks = self.message.chunks
_chunk_lengths_iter = (ch.phys_size() for ch in chunks)
logger.verbose('Received %i chunk(s) from %r: %r',
len(chunks) if chunks else 0,
sender,
chunks)
# Check if the chunks were expected...
exp_chunk_tuples = [HostQueries.HostChunks
.get_expected_chunk(_chunk.uuid,
sender.uuid)
for _chunk in chunks]
byte_size_to_wipe = 0
for _chunk_len, exp_chunk_tuple in izip(_chunk_lengths_iter,
exp_chunk_tuples):
doing_replication_not_restore = exp_chunk_tuple is None or \
not exp_chunk_tuple.restore_flag
# But if it was the dummy replication chunk,
# we need to free some space by killing some dummy chunks.
if doing_replication_not_restore:
byte_size_to_wipe += _chunk_len
# Now really cleanup some dummy chunks
if byte_size_to_wipe != 0:
how_many_chunks_to_wipe = \
round_up_to_multiply(byte_size_to_wipe, 0x100000) // 0x100000
logger.debug('Before writing chunks body: wiping %i chunks',
how_many_chunks_to_wipe)
self.manager.app.chunk_storage.delete_some_dummy_chunks(
how_many_chunks_to_wipe)
# Let's consider it successful for the phase of chunks writing,
# unless even a single chunk fails to write.
overall_success = True
# And finally, loop over the chunks and write their bodies.
for _chunk, exp_chunk_tuple in izip(chunks, exp_chunk_tuples):
_chunk_uuid = _chunk.uuid
_expected_hash = _chunk.hash
_actual_hash = _chunk.hash_from_body
if _expected_hash != _actual_hash:
logger.error('Chunk %s has hash %s rather than %s; '
'writing this for now, but someday '
'might need to fix it to prevent '
'the cloud/deduplication clogging '
'with the unreadable files.',
_chunk_uuid,
binascii.hexlify(_actual_hash),
binascii.hexlify(_expected_hash))
logger.debug('Writing chunk %r', _chunk)
try:
self.manager.app.chunk_storage.write_chunk(_chunk,
is_dummy=False)
except Exception:
logger.exception('Could not store the incoming chunk %r; '
'will be considered as failed',
_chunk)
overall_success = False
else: # written successfully
if exp_chunk_tuple is not None:
# This is an expected chunk, either replication
# (restore_flag = False)
# or restore-related (restore_flag = True) one.
logger.debug('Received unexpected chunk %r from %r, '
'meeting expectation (%s)',
_chunk_uuid,
sender.uuid,
exp_chunk_tuple.restore_flag)
HostQueries.HostChunks.meet_expectations(
_chunk_uuid, sender.uuid, exp_chunk_tuple.restore_flag)
else:
# This is an unexpected chunk,
# assume it is a replication
logger.debug('Received unexpected chunk %r from %r, '
'assume replication',
_chunk_uuid, sender)
# If something failed before this moment, the default value of
# C{incoming_success} of False will consider the transaction failed.
with self.open_state(for_update=True) as state:
state.incoming_success = overall_success
logger.debug('Overall success of %r is %r', self, overall_success)
# At the very end, regenerate back the dummy chunks, if needed.
logger.debug('After writing chunk body: recalculating dummy chunks')
self.manager.app.chunk_storage.update_dummy_chunks_size()
def update_dummy_chunks_size(self,
old_limit_mib=None, new_limit_mib=None):
"""
Whenever the situation with the chunks could have been changed,
update the dummy chunks: create new ones if there is a lack of them,
or remove unneeded ones if there is an excess of them.
@param old_limit_mib: The previous total amount of chunks to keep
in storage, assumed 0 if None.
@type old_limit_mib: numbers.Integral, NoneType
@param new_limit_mib: The new total amount of chunks to keep
in storage, taken from the settings if None.
@type new_limit_mib: numbers.Integral, NoneType
"""
# For clarity only
super(ChunkStorageFS, self).update_dummy_chunks_size(old_limit_mib,
new_limit_mib)
# TODO! TODO! TODO! we don't bother with dummy chunks for now
logger.warn('update_dummy_chunks_size() disabled')
return
if new_limit_mib is None:
assert old_limit_mib is None
new_limit_mib = \
HostQueries.HostSettings.get(Queries.Settings
.MAX_STORAGE_SIZE_MIB)
# This two variables will be used to specify the progress of the task.
num, of = 0, 0
_operation = '<generic operation>'
@exceptions_logged(logger)
def timercb():
"""
Callback function called on timer firing.
"""
if (num, of) != (0, 0):
logger_status_chunks_op.info(
'The chunk reallocation takes too long, completed %i/%i',
num, of,
extra={'_type': 'chunks_allocation.progress',
'num': num,
'of': of})
timer_service = TimerService(1.0, timercb)
# If the task takes more than 3 seconds,
# start notifying about the progress
_callLater = reactor.callLater # pylint:disable=E1101,C0103
# Won't worry about deferToThread here, cause it is very fast.
long_task_timer = _callLater(3.0, timer_service.startService)
logger.debug('Resizing dummy chunk set from %s to %s',
old_limit_mib, new_limit_mib)
with self.__chunk_op_lock:
try:
# Check for dummy chunks before the check for present files,
# as the check for dummy chunks also may remove some
# of the files.
# What dummy chunks are available?
# list, so it can be used twice.
# TODO: do we need to use it twice?
dummy_chunk_uuids = list(self.__get_dummy_chunk_uuids_on_fs())
how_many_dummy_chunks = len(dummy_chunk_uuids)
# What chunk files are present on the FS,...
present_chunk_filenames_iter = \
self.__get_chunk_filenames_on_fs(self.__chunk_dir)
# ... and what are the chunk UUIDs?
# present_chunk_uuids = \
# self.__class__.convert_chunk_filenames_to_uuids(
# present_chunk_filenames)
# How many bytes/MiB do we need to have preallocated?
reserved_mib = long(new_limit_mib)
reserved_size = reserved_mib * 0x100000
# How many bytes/MiB is preallocated already?
present_chunk_size = \
sum(os.stat(f).st_size
for f in present_chunk_filenames_iter)
del present_chunk_filenames_iter # help GC
present_chunks_in_mib = \
round_up_to_multiply(present_chunk_size,
0x100000) // 0x100000
if reserved_mib > present_chunks_in_mib:
# Add new chunks
how_many_new_chunks = reserved_mib - present_chunks_in_mib
of = how_many_new_chunks
_operation = 'allocation'
for u in self.__create_some_dummy_chunks(
how_many_new_chunks):
num += 1
elif reserved_mib < present_chunks_in_mib:
# Try to remove some dummy chunks...
how_many_chunks_try_to_remove = \
present_chunks_in_mib - reserved_mib
# But we cannot remove more than len(dummy_chunk_uuids)!
if how_many_dummy_chunks < how_many_chunks_try_to_remove:
logger.debug('Trying to remove %i chunks, '
'but only %i dummy chunks available!',
how_many_chunks_try_to_remove,
how_many_dummy_chunks)
how_many_chunks_to_remove = \
min(how_many_chunks_try_to_remove,
how_many_dummy_chunks)
of = how_many_chunks_to_remove
_operation = 'removing'
chunk_uuids_to_delete = take(how_many_chunks_to_remove,
dummy_chunk_uuids)
for u in self.delete_some_dummy_chunks(
how_many_chunks_to_remove,
chunk_uuids_to_delete):
num += 1
except Exception as e:
logger_status_chunks_op_error.error(
'The chunk %s failed: %r',
_operation, e,
extra={'_type': 'chunks_allocation.error',
'_exc': e,
'_tb': traceback.format_exc()})
finally:
# We've done with the chunks allocation.
# Now stop the timer, and manually report that 100%
# of the work is done.
if (not long_task_timer.called and
not long_task_timer.cancelled):
long_task_timer.cancel()
if timer_service.running:
timer_service.stopService()
timercb()
