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"""
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
"""
from __future__ import absolute_import
import copy
import json
import logging
"""
import org.I0Itec.zkclient.ZkClient
import org.I0Itec.zkclient.exception.ZkNoNodeException
import org.I0Itec.zkclient.exception.ZkNodeExistsException
import org.I0Itec.zkclient.serialize.ZkSerializer
import org.apache.zookeeper.ZooDefs;
"""
from kafka.streams.errors import StreamsError
log = logging.getLogger(__name__)
class InternalTopicManager(object):
# TODO: the following ZK dependency should be removed after KIP-4
ZK_TOPIC_PATH = '/brokers/topics'
ZK_BROKER_PATH = '/brokers/ids'
ZK_DELETE_TOPIC_PATH = '/admin/delete_topics'
ZK_ENTITY_CONFIG_PATH = '/config/topics'
# TODO: the following LogConfig dependency should be removed after KIP-4
CLEANUP_POLICY_PROP = 'cleanup.policy'
COMPACT = 'compact'
ZK_ENCODING = 'utf-8'
def __init__(self, zk_connect=None, replication_factor=0):
if zk_connect:
#self.zk_client = ZkClient(zk_connect, 30 * 1000, 30 * 1000, self.ZK_ENCODING)
self.zk_client = None
else:
self.zk_client = None
self.replication_factor = replication_factor
def make_ready(self, topic, num_partitions, compact_topic):
topic_not_ready = True
while topic_not_ready:
topic_metadata = self.get_topic_metadata(topic)
if not topic_metadata:
try:
self.create_topic(topic, num_partitions, self.replication_factor, compact_topic)
except Exception: #ZkNodeExistsError:
# ignore and continue
pass
else:
if len(topic_metadata) > num_partitions:
# else if topic exists with more #.partitions than needed, delete in order to re-create it
try:
self.delete_topic(topic)
except Exception: #ZkNodeExistsError:
# ignore and continue
pass
elif len(topic_metadata) < num_partitions:
# else if topic exists with less #.partitions than needed, add partitions
try:
self.add_partitions(topic, num_partitions - len(topic_metadata), self.replication_factor, topic_metadata)
except Exception: #ZkNoNodeError:
# ignore and continue
pass
else:
topic_not_ready = False
def get_brokers(self):
brokers = []
for broker in self.zk_client.get_children(self.ZK_BROKER_PATH):
brokers.append(int(broker))
brokers.sort()
log.debug("Read brokers %s from ZK in partition assignor.", brokers)
return brokers
def get_topic_metadata(self, topic):
data = self.zk_client.read_data(self.ZK_TOPIC_PATH + "/" + topic, True)
if data is None:
return None
try:
partitions = json.loads(data).get('partitions')
log.debug("Read partitions %s for topic %s from ZK in partition assignor.", partitions, topic)
return partitions
except Exception as e:
raise StreamsError("Error while reading topic metadata from ZK for internal topic " + topic, e)
def create_topic(self, topic, num_partitions, replication_factor, compact_topic):
log.debug("Creating topic %s with %s partitions from ZK in partition assignor.", topic, num_partitions)
brokers = self.get_brokers()
num_brokers = len(brokers)
if num_brokers < replication_factor:
log.warn("Not enough brokers found. The replication factor is reduced from " + replication_factor + " to " + num_brokers)
replication_factor = num_brokers
assignment = {}
for i in range(num_partitions):
broker_list = []
for r in range(replication_factor):
shift = r * num_brokers / replication_factor
broker_list.append(brokers[(i + shift) % num_brokers])
assignment[i] = broker_list
# write out config first just like in AdminUtils.scala createOrUpdateTopicPartitionAssignmentPathInZK()
if compact_topic:
try:
data_map = {
'version': 1,
'config': {
'cleanup.policy': 'compact'
}
}
data = json.dumps(data_map)
#zk_client.create_persistent(self.ZK_ENTITY_CONFIG_PATH + "/" + topic, data, ZooDefs.Ids.OPEN_ACL_UNSAFE)
except Exception as e:
raise StreamsError('Error while creating topic config in ZK for internal topic ' + topic, e)
# try to write to ZK with open ACL
try:
data_map = {
'version': 1,
'partitions': assignment
}
data = json.dumps(data_map)
#zk_client.create_persistent(self.ZK_TOPIC_PATH + "/" + topic, data, ZooDefs.Ids.OPEN_ACL_UNSAFE)
except Exception as e:
raise StreamsError('Error while creating topic metadata in ZK for internal topic ' + topic, e)
def delete_topic(self, topic):
log.debug('Deleting topic %s from ZK in partition assignor.', topic)
#zk_client.create_persistent(self.ZK_DELETE_TOPIC_PATH + "/" + topic, "", ZooDefs.Ids.OPEN_ACL_UNSAFE)
def add_partitions(self, topic, num_partitions, replication_factor, existing_assignment):
log.debug('Adding %s partitions topic %s from ZK with existing'
' partitions assigned as %s in partition assignor.',
topic, num_partitions, existing_assignment)
brokers = self.get_brokers()
num_brokers = len(brokers)
if (num_brokers < replication_factor):
log.warning('Not enough brokers found. The replication factor is'
' reduced from %s to %s', replication_factor, num_brokers)
replication_factor = num_brokers
start_index = len(existing_assignment)
new_assignment = copy.deepcopy(existing_assignment)
for i in range(num_partitions):
broker_list = []
for r in range(replication_factor):
shift = r * num_brokers / replication_factor
broker_list.append(brokers[(i + shift) % num_brokers])
new_assignment[i + start_index] = broker_list
# try to write to ZK with open ACL
try:
data_map = {
'version': 1,
'partitions': new_assignment
}
data = json.dumps(data_map)
#zk_client.write_data(ZK_TOPIC_PATH + "/" + topic, data)
except Exception as e:
raise StreamsError('Error while updating topic metadata in ZK for internal topic ' + topic, e)
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