/usr/lib/python2.7/dist-packages/kafka/cluster.py is in python-kafka 1.3.2-0ubuntu1.
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import collections
import copy
import logging
import threading
import time
from kafka.vendor import six
from . import errors as Errors
from .future import Future
from .structs import BrokerMetadata, PartitionMetadata, TopicPartition
log = logging.getLogger(__name__)
class ClusterMetadata(object):
DEFAULT_CONFIG = {
'retry_backoff_ms': 100,
'metadata_max_age_ms': 300000,
}
def __init__(self, **configs):
self._brokers = {} # node_id -> BrokerMetadata
self._partitions = {} # topic -> partition -> PartitionMetadata
self._broker_partitions = collections.defaultdict(set) # node_id -> {TopicPartition...}
self._groups = {} # group_name -> node_id
self._last_refresh_ms = 0
self._last_successful_refresh_ms = 0
self._need_update = False
self._future = None
self._listeners = set()
self._lock = threading.Lock()
self.need_all_topic_metadata = False
self.unauthorized_topics = set()
self.internal_topics = set()
self.controller = None
self.config = copy.copy(self.DEFAULT_CONFIG)
for key in self.config:
if key in configs:
self.config[key] = configs[key]
def brokers(self):
"""Get all BrokerMetadata
Returns:
set: {BrokerMetadata, ...}
"""
return set(self._brokers.values())
def broker_metadata(self, broker_id):
"""Get BrokerMetadata
Arguments:
broker_id (int): node_id for a broker to check
Returns:
BrokerMetadata or None if not found
"""
return self._brokers.get(broker_id)
def partitions_for_topic(self, topic):
"""Return set of all partitions for topic (whether available or not)
Arguments:
topic (str): topic to check for partitions
Returns:
set: {partition (int), ...}
"""
if topic not in self._partitions:
return None
return set(self._partitions[topic].keys())
def available_partitions_for_topic(self, topic):
"""Return set of partitions with known leaders
Arguments:
topic (str): topic to check for partitions
Returns:
set: {partition (int), ...}
"""
if topic not in self._partitions:
return None
return set([partition for partition, metadata
in six.iteritems(self._partitions[topic])
if metadata.leader != -1])
def leader_for_partition(self, partition):
"""Return node_id of leader, -1 unavailable, None if unknown."""
if partition.topic not in self._partitions:
return None
elif partition.partition not in self._partitions[partition.topic]:
return None
return self._partitions[partition.topic][partition.partition].leader
def partitions_for_broker(self, broker_id):
"""Return TopicPartitions for which the broker is a leader.
Arguments:
broker_id (int): node id for a broker
Returns:
set: {TopicPartition, ...}
"""
return self._broker_partitions.get(broker_id)
def coordinator_for_group(self, group):
"""Return node_id of group coordinator.
Arguments:
group (str): name of consumer group
Returns:
int: node_id for group coordinator
"""
return self._groups.get(group)
def ttl(self):
"""Milliseconds until metadata should be refreshed"""
now = time.time() * 1000
if self._need_update:
ttl = 0
else:
metadata_age = now - self._last_successful_refresh_ms
ttl = self.config['metadata_max_age_ms'] - metadata_age
retry_age = now - self._last_refresh_ms
next_retry = self.config['retry_backoff_ms'] - retry_age
return max(ttl, next_retry, 0)
def refresh_backoff(self):
"""Return milliseconds to wait before attempting to retry after failure"""
return self.config['retry_backoff_ms']
def request_update(self):
"""Flags metadata for update, return Future()
Actual update must be handled separately. This method will only
change the reported ttl()
Returns:
kafka.future.Future (value will be the cluster object after update)
"""
with self._lock:
self._need_update = True
if not self._future or self._future.is_done:
self._future = Future()
return self._future
def topics(self, exclude_internal_topics=True):
"""Get set of known topics.
Arguments:
exclude_internal_topics (bool): Whether records from internal topics
(such as offsets) should be exposed to the consumer. If set to
True the only way to receive records from an internal topic is
subscribing to it. Default True
Returns:
set: {topic (str), ...}
"""
topics = set(self._partitions.keys())
if exclude_internal_topics:
return topics - self.internal_topics
else:
return topics
def failed_update(self, exception):
"""Update cluster state given a failed MetadataRequest."""
f = None
with self._lock:
if self._future:
f = self._future
self._future = None
if f:
f.failure(exception)
self._last_refresh_ms = time.time() * 1000
def update_metadata(self, metadata):
"""Update cluster state given a MetadataResponse.
Arguments:
metadata (MetadataResponse): broker response to a metadata request
Returns: None
"""
# In the common case where we ask for a single topic and get back an
# error, we should fail the future
if len(metadata.topics) == 1 and metadata.topics[0][0] != 0:
error_code, topic = metadata.topics[0][:2]
error = Errors.for_code(error_code)(topic)
return self.failed_update(error)
if not metadata.brokers:
log.warning("No broker metadata found in MetadataResponse")
for broker in metadata.brokers:
if metadata.API_VERSION == 0:
node_id, host, port = broker
rack = None
else:
node_id, host, port, rack = broker
self._brokers.update({
node_id: BrokerMetadata(node_id, host, port, rack)
})
if metadata.API_VERSION == 0:
self.controller = None
else:
self.controller = self._brokers.get(metadata.controller_id)
_new_partitions = {}
_new_broker_partitions = collections.defaultdict(set)
_new_unauthorized_topics = set()
_new_internal_topics = set()
for topic_data in metadata.topics:
if metadata.API_VERSION == 0:
error_code, topic, partitions = topic_data
is_internal = False
else:
error_code, topic, is_internal, partitions = topic_data
if is_internal:
_new_internal_topics.add(topic)
error_type = Errors.for_code(error_code)
if error_type is Errors.NoError:
_new_partitions[topic] = {}
for p_error, partition, leader, replicas, isr in partitions:
_new_partitions[topic][partition] = PartitionMetadata(
topic=topic, partition=partition, leader=leader,
replicas=replicas, isr=isr, error=p_error)
if leader != -1:
_new_broker_partitions[leader].add(
TopicPartition(topic, partition))
elif error_type is Errors.LeaderNotAvailableError:
log.warning("Topic %s is not available during auto-create"
" initialization", topic)
elif error_type is Errors.UnknownTopicOrPartitionError:
log.error("Topic %s not found in cluster metadata", topic)
elif error_type is Errors.TopicAuthorizationFailedError:
log.error("Topic %s is not authorized for this client", topic)
_new_unauthorized_topics.add(topic)
elif error_type is Errors.InvalidTopicError:
log.error("'%s' is not a valid topic name", topic)
else:
log.error("Error fetching metadata for topic %s: %s",
topic, error_type)
with self._lock:
self._partitions = _new_partitions
self._broker_partitions = _new_broker_partitions
self.unauthorized_topics = _new_unauthorized_topics
self.internal_topics = _new_internal_topics
f = None
if self._future:
f = self._future
self._future = None
self._need_update = False
now = time.time() * 1000
self._last_refresh_ms = now
self._last_successful_refresh_ms = now
if f:
f.success(self)
log.debug("Updated cluster metadata to %s", self)
for listener in self._listeners:
listener(self)
def add_listener(self, listener):
"""Add a callback function to be called on each metadata update"""
self._listeners.add(listener)
def remove_listener(self, listener):
"""Remove a previously added listener callback"""
self._listeners.remove(listener)
def add_group_coordinator(self, group, response):
"""Update with metadata for a group coordinator
Arguments:
group (str): name of group from GroupCoordinatorRequest
response (GroupCoordinatorResponse): broker response
Returns:
bool: True if metadata is updated, False on error
"""
log.debug("Updating coordinator for %s: %s", group, response)
error_type = Errors.for_code(response.error_code)
if error_type is not Errors.NoError:
log.error("GroupCoordinatorResponse error: %s", error_type)
self._groups[group] = -1
return False
node_id = response.coordinator_id
coordinator = BrokerMetadata(
response.coordinator_id,
response.host,
response.port,
None)
# Assume that group coordinators are just brokers
# (this is true now, but could diverge in future)
if node_id not in self._brokers:
self._brokers[node_id] = coordinator
# If this happens, either brokers have moved without
# changing IDs, or our assumption above is wrong
else:
node = self._brokers[node_id]
if coordinator.host != node.host or coordinator.port != node.port:
log.error("GroupCoordinator metadata conflicts with existing"
" broker metadata. Coordinator: %s, Broker: %s",
coordinator, node)
self._groups[group] = node_id
return False
log.info("Group coordinator for %s is %s", group, coordinator)
self._groups[group] = node_id
return True
def with_partitions(self, partitions_to_add):
"""Returns a copy of cluster metadata with partitions added"""
new_metadata = ClusterMetadata(**self.config)
new_metadata._brokers = copy.deepcopy(self._brokers)
new_metadata._partitions = copy.deepcopy(self._partitions)
new_metadata._broker_partitions = copy.deepcopy(self._broker_partitions)
new_metadata._groups = copy.deepcopy(self._groups)
new_metadata.internal_topics = copy.deepcopy(self.internal_topics)
new_metadata.unauthorized_topics = copy.deepcopy(self.unauthorized_topics)
for partition in partitions_to_add:
new_metadata._partitions[partition.topic][partition.partition] = partition
if partition.leader is not None and partition.leader != -1:
new_metadata._broker_partitions[partition.leader].add(
TopicPartition(partition.topic, partition.partition))
return new_metadata
def __str__(self):
return 'ClusterMetadata(brokers: %d, topics: %d, groups: %d)' % \
(len(self._brokers), len(self._partitions), len(self._groups))
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