def _proc_fetch_request(self, assignment, node_id, request):
needs_wakeup = False
try:
response = yield from self._client.send(node_id, request)
except Errors.KafkaError as err:
log.error("Failed fetch messages from %s: %s", node_id, err)
return False
except asyncio.CancelledError:
# Either `close()` or partition unassigned. Either way the result
# is no longer of interest.
return False
if not assignment.active:
log.debug(
"Discarding fetch response since the assignment changed during"
" fetch")
return False
fetch_offsets = {}
for topic, partitions in request.topics:
for partition, offset, _ in partitions:
fetch_offsets[TopicPartition(topic, partition)] = offset
for topic, partitions in response.topics:
for partition, error_code, highwater, *part_data in partitions:
tp = TopicPartition(topic, partition)
error_type = Errors.for_code(error_code)
fetch_offset = fetch_offsets[tp]
tp_state = assignment.state_value(tp)
if not tp_state.has_valid_position or \
tp_state.position != fetch_offset:
log.debug(
"Discarding fetch response for partition %s "
"since its offset %s does not match the current "
"position", tp, fetch_offset)
continue
if error_type is Errors.NoError:
tp_state.highwater = highwater
# part_data also contains lso, aborted_transactions.
# message_set is last
records = MemoryRecords(part_data[-1])
if records.has_next():
log.debug(
"Adding fetched record for partition %s with"
" offset %d to buffered record list", tp,
fetch_offset)
message_iterator = self._unpack_records(tp, records)
self._records[tp] = FetchResult(
tp,
message_iterator=message_iterator,
assignment=assignment,
backoff=self._prefetch_backoff,
fetch_offset=fetch_offset,
loop=self._loop)
# We added at least 1 successful record
needs_wakeup = True
elif records.size_in_bytes() > 0:
# we did not read a single message from a non-empty
# buffer because that message's size is larger than
# fetch size, in this case record this exception
err = RecordTooLargeError(
"There are some messages at [Partition=Offset]: "
"%s=%s whose size is larger than the fetch size %s"
" and hence cannot be ever returned. "
"Increase the fetch size, or decrease the maximum "
"message size the broker will allow.", tp,
fetch_offset, self._max_partition_fetch_bytes)
self._set_error(tp, err)
tp_state.consumed_to(tp_state.position + 1)
needs_wakeup = True
elif error_type in (Errors.NotLeaderForPartitionError,
Errors.UnknownTopicOrPartitionError):
self._client.force_metadata_update()
elif error_type is Errors.OffsetOutOfRangeError:
if self._default_reset_strategy != \
OffsetResetStrategy.NONE:
tp_state.await_reset(self._default_reset_strategy)
else:
err = Errors.OffsetOutOfRangeError({tp: fetch_offset})
self._set_error(tp, err)
needs_wakeup = True
log.info(
"Fetch offset %s is out of range for partition %s,"
" resetting offset", fetch_offset, tp)
elif error_type is Errors.TopicAuthorizationFailedError:
log.warning("Not authorized to read from topic %s.",
tp.topic)
err = Errors.TopicAuthorizationFailedError(tp.topic)
self._set_error(tp, err)
needs_wakeup = True
else:
log.warning('Unexpected error while fetching data: %s',
error_type.__name__)
return needs_wakeup
def _proc_fetch_request(self, node_id, request):
needs_wakeup = False
needs_position_update = []
try:
response = yield from self._client.send(node_id, request)
except Errors.KafkaError as err:
log.error("Failed fetch messages from %s: %s", node_id, err)
return False
finally:
self._in_flight.remove(node_id)
fetch_offsets = {}
for topic, partitions in request.topics:
for partition, offset, _ in partitions:
fetch_offsets[TopicPartition(topic, partition)] = offset
for topic, partitions in response.topics:
for partition, error_code, highwater, raw_batch in partitions:
tp = TopicPartition(topic, partition)
error_type = Errors.for_code(error_code)
if not self._subscriptions.is_fetchable(tp):
# this can happen when a rebalance happened
log.debug(
"Ignoring fetched records for partition %s"
" since it is no longer fetchable", tp)
elif error_type is Errors.NoError:
tp_assignment = self._subscriptions.assignment[tp]
tp_assignment.highwater = highwater
# `drop_pending_message_set` is set after a seek to another
# position. If we request the *new* position we have to
# drop this flag, so we catch future seek's.
fetch_offset = fetch_offsets[tp]
if fetch_offset == tp_assignment.position:
tp_assignment.drop_pending_message_set = False
records = MemoryRecords(raw_batch)
if records.has_next():
log.debug(
"Adding fetched record for partition %s with"
" offset %d to buffered record list", tp,
fetch_offset)
message_iterator = self._unpack_records(tp, records)
self._records[tp] = FetchResult(
tp,
records=message_iterator,
subscriptions=self._subscriptions,
backoff=self._prefetch_backoff,
loop=self._loop)
# We added at least 1 successful record
needs_wakeup = True
elif records.size_in_bytes() > 0:
# we did not read a single message from a non-empty
# buffer because that message's size is larger than
# fetch size, in this case record this exception
err = RecordTooLargeError(
"There are some messages at [Partition=Offset]: "
"%s=%s whose size is larger than the fetch size %s"
" and hence cannot be ever returned. "
"Increase the fetch size, or decrease the maximum "
"message size the broker will allow.", tp,
fetch_offset, self._max_partition_fetch_bytes)
self._set_error(tp, err)
needs_wakeup = True
self._subscriptions.assignment[tp].position += 1
elif error_type in (Errors.NotLeaderForPartitionError,
Errors.UnknownTopicOrPartitionError):
self._client.force_metadata_update()
elif error_type is Errors.OffsetOutOfRangeError:
fetch_offset = fetch_offsets[tp]
if self._subscriptions.has_default_offset_reset_policy():
self._subscriptions.need_offset_reset(tp)
needs_position_update.append(tp)
else:
err = Errors.OffsetOutOfRangeError({tp: fetch_offset})
self._set_error(tp, err)
needs_wakeup = True
log.info(
"Fetch offset %s is out of range for partition %s,"
" resetting offset", fetch_offset, tp)
elif error_type is Errors.TopicAuthorizationFailedError:
log.warn("Not authorized to read from topic %s.", tp.topic)
err = Errors.TopicAuthorizationFailedError(tp.topic)
self._set_error(tp, err)
needs_wakeup = True
else:
log.warn('Unexpected error while fetching data: %s',
error_type.__name__)
if needs_position_update:
try:
yield from self.update_fetch_positions(needs_position_update)
except Exception: # pragma: no cover
log.error("Unexpected error updating fetch positions",
exc_info=True)
return needs_wakeup
