openstack/deb-python-kafka
Code Issues Proposed changes

Merge branch 'issue-35'

Browse Source 
Conflicts:
	kafka/__init__.py
	kafka/consumer.py
	test/test_integration.py
This commit is contained in:
David Arthur
2013-07-26 08:39:44 -04:00
parent 5684af438e 1d278f0f60
commit e297a7a8c8
6 changed files with 589 additions and 109 deletions
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18
README.md
View File

@@ -89,6 +89,24 @@ producer.send("key2", "this methode")
producer = KeyedProducer(kafka, "my-topic", partitioner=RoundRobinPartitioner)
```
## Multiprocess consumer
```python
from kafka.consume import MultiProcessConsumer
# This will split the number of partitions among two processes
consumer = MultiProcessConsumer(kafka, "my-topic", "my-group", num_procs=2)
# This will spawn processes such that each handles 2 partitions max
consumer = MultiProcessConsumer(kafka, "my-topic", "my-group",
partitions_per_proc=2)
for message in consumer:
print(message)
for message in consumer.get_messages(count=5, block=True, timeout=4):
print(message)
```
## Low level
```python

5
kafka/__init__.py
View File

@@ -11,10 +11,11 @@ from kafka.protocol import (
)
from kafka.producer import SimpleProducer, KeyedProducer
from kafka.partitioner import RoundRobinPartitioner, HashedPartitioner
from kafka.consumer import SimpleConsumer
from kafka.consumer import SimpleConsumer, MultiProcessConsumer
__all__ = [
'KafkaClient', 'KafkaConnection', 'SimpleProducer', 'KeyedProducer',
'RoundRobinPartitioner', 'HashedPartitioner', 'SimpleConsumer',
'create_message', 'create_gzip_message', 'create_snappy_message'
'MultiProcessConsumer', 'create_message', 'create_gzip_message',
'create_snappy_message'
]

14
kafka/client.py
View File

@@ -180,6 +180,10 @@ class KafkaClient(object):
for conn in self.conns.values():
conn.close()
def reinit(self):
for conn in self.conns.values():
conn.reinit()
def send_produce_request(self, payloads=[], acks=1, timeout=1000,
fail_on_error=True, callback=None):
"""
@@ -230,15 +234,19 @@ class KafkaClient(object):
return out
def send_fetch_request(self, payloads=[], fail_on_error=True,
callback=None):
callback=None, max_wait_time=100, min_bytes=4096):
"""
Encode and send a FetchRequest
Payloads are grouped by topic and partition so they can be pipelined
to the same brokers.
"""
resps = self._send_broker_aware_request(payloads,
KafkaProtocol.encode_fetch_request,
encoder = partial(KafkaProtocol.encode_fetch_request,
max_wait_time=max_wait_time,
min_bytes=min_bytes)
resps = self._send_broker_aware_request(payloads, encoder,
KafkaProtocol.decode_fetch_response)
out = []

9
kafka/conn.py
View File

@@ -86,3 +86,12 @@ class KafkaConnection(local):
def close(self):
"Close this connection"
self._sock.close()
def reinit(self):
"""
Re-initialize the socket connection
"""
self._sock.close()
self._sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self._sock.connect((self.host, self.port))
self._sock.settimeout(10)

523
kafka/consumer.py
View File

@@ -1,6 +1,10 @@
from collections import defaultdict
from itertools import izip_longest, repeat
import logging
import time
from threading import Lock
from multiprocessing import Process, Queue, Event, Value
from Queue import Empty
from kafka.common import (
ErrorMapping, FetchRequest,
@@ -16,37 +20,60 @@ log = logging.getLogger("kafka")
AUTO_COMMIT_MSG_COUNT = 100
AUTO_COMMIT_INTERVAL = 5000
FETCH_DEFAULT_BLOCK_TIMEOUT = 1
FETCH_MAX_WAIT_TIME = 100
FETCH_MIN_BYTES = 4096
class SimpleConsumer(object):
class FetchContext(object):
"""
A simple consumer implementation that consumes all partitions for a topic
client: a connected KafkaClient
group: a name for this consumer, used for offset storage and must be unique
topic: the topic to consume
auto_commit: default True. Whether or not to auto commit the offsets
auto_commit_every_n: default 100. How many messages to consume
before a commit
auto_commit_every_t: default 5000. How much time (in milliseconds) to
wait before commit
Auto commit details:
If both auto_commit_every_n and auto_commit_every_t are set, they will
reset one another when one is triggered. These triggers simply call the
commit method on this class. A manual call to commit will also reset
these triggers
Class for managing the state of a consumer during fetch
"""
def __init__(self, client, group, topic, auto_commit=False,
def __init__(self, consumer, block, timeout):
self.consumer = consumer
self.block = block
if block and not timeout:
timeout = FETCH_DEFAULT_BLOCK_TIMEOUT
self.timeout = timeout * 1000
def __enter__(self):
"""Set fetch values based on blocking status"""
if self.block:
self.consumer.fetch_max_wait_time = self.timeout
self.consumer.fetch_min_bytes = 1
else:
self.consumer.fetch_min_bytes = 0
def __exit__(self, type, value, traceback):
"""Reset values to default"""
self.consumer.fetch_max_wait_time = FETCH_MAX_WAIT_TIME
self.consumer.fetch_min_bytes = FETCH_MIN_BYTES
class Consumer(object):
"""
Base class to be used by other consumers. Not to be used directly
This base class provides logic for
* initialization and fetching metadata of partitions
* Auto-commit logic
* APIs for fetching pending message count
"""
def __init__(self, client, group, topic, partitions=None, auto_commit=True,
auto_commit_every_n=AUTO_COMMIT_MSG_COUNT,
auto_commit_every_t=AUTO_COMMIT_INTERVAL):
self.client = client
self.topic = topic
self.group = group
self.client._load_metadata_for_topics(topic)
self.offsets = {}
if not partitions:
partitions = self.client.topic_partitions[topic]
# Variables for handling offset commits
self.commit_lock = Lock()
self.commit_timer = None
@@ -73,84 +100,17 @@ class SimpleConsumer(object):
# Uncomment for 0.8.1
#
#for partition in self.client.topic_partitions[topic]:
#for partition in partitions:
# req = OffsetFetchRequest(topic, partition)
# (offset,) = self.client.send_offset_fetch_request(group, [req],
# callback=get_or_init_offset_callback,
# fail_on_error=False)
# self.offsets[partition] = offset
for partition in self.client.topic_partitions[topic]:
for partition in partitions:
self.offsets[partition] = 0
def stop(self):
if self.commit_timer is not None:
self.commit_timer.stop()
self.commit()
def seek(self, offset, whence):
"""
Alter the current offset in the consumer, similar to fseek
offset: how much to modify the offset
whence: where to modify it from
0 is relative to the earliest available offset (head)
1 is relative to the current offset
2 is relative to the latest known offset (tail)
"""
if whence == 1: # relative to current position
for partition, _offset in self.offsets.items():
self.offsets[partition] = _offset + offset
elif whence in (0, 2): # relative to beginning or end
# divide the request offset by number of partitions,
# distribute the remained evenly
(delta, rem) = divmod(offset, len(self.offsets))
deltas = {}
for partition, r in izip_longest(self.offsets.keys(),
repeat(1, rem), fillvalue=0):
deltas[partition] = delta + r
reqs = []
for partition in self.offsets.keys():
if whence == 0:
reqs.append(OffsetRequest(self.topic, partition, -2, 1))
elif whence == 2:
reqs.append(OffsetRequest(self.topic, partition, -1, 1))
else:
pass
resps = self.client.send_offset_request(reqs)
for resp in resps:
self.offsets[resp.partition] = resp.offsets[0] + \
deltas[resp.partition]
else:
raise ValueError("Unexpected value for `whence`, %d" % whence)
def pending(self, partitions=[]):
"""
Gets the pending message count
partitions: list of partitions to check for, default is to check all
"""
if len(partitions) == 0:
partitions = self.offsets.keys()
total = 0
reqs = []
for partition in partitions:
reqs.append(OffsetRequest(self.topic, partition, -1, 1))
resps = self.client.send_offset_request(reqs)
for resp in resps:
partition = resp.partition
pending = resp.offsets[0]
offset = self.offsets[partition]
total += pending - offset - (1 if offset > 0 else 0)
return total
def commit(self, partitions=[]):
def commit(self, partitions=None):
"""
Commit offsets for this consumer
@@ -170,7 +130,7 @@ class SimpleConsumer(object):
return
reqs = []
if len(partitions) == 0: # commit all partitions
if not partitions: # commit all partitions
partitions = self.offsets.keys()
for partition in partitions:
@@ -200,6 +160,148 @@ class SimpleConsumer(object):
if self.count_since_commit > self.auto_commit_every_n:
self.commit()
def stop(self):
if self.commit_timer is not None:
self.commit_timer.stop()
self.commit()
def pending(self, partitions=None):
"""
Gets the pending message count
partitions: list of partitions to check for, default is to check all
"""
if not partitions:
partitions = self.offsets.keys()
total = 0
reqs = []
for partition in partitions:
reqs.append(OffsetRequest(self.topic, partition, -1, 1))
resps = self.client.send_offset_request(reqs)
for resp in resps:
partition = resp.partition
pending = resp.offsets[0]
offset = self.offsets[partition]
total += pending - offset - (1 if offset > 0 else 0)
return total
class SimpleConsumer(Consumer):
"""
A simple consumer implementation that consumes all/specified partitions
for a topic
client: a connected KafkaClient
group: a name for this consumer, used for offset storage and must be unique
topic: the topic to consume
partitions: An optional list of partitions to consume the data from
auto_commit: default True. Whether or not to auto commit the offsets
auto_commit_every_n: default 100. How many messages to consume
before a commit
auto_commit_every_t: default 5000. How much time (in milliseconds) to
wait before commit
Auto commit details:
If both auto_commit_every_n and auto_commit_every_t are set, they will
reset one another when one is triggered. These triggers simply call the
commit method on this class. A manual call to commit will also reset
these triggers
"""
def __init__(self, client, group, topic, auto_commit=True, partitions=None,
auto_commit_every_n=AUTO_COMMIT_MSG_COUNT,
auto_commit_every_t=AUTO_COMMIT_INTERVAL):
self.partition_info = False # Do not return partition info in msgs
self.fetch_max_wait_time = FETCH_MAX_WAIT_TIME
self.fetch_min_bytes = FETCH_MIN_BYTES
self.fetch_started = defaultdict(bool) # defaults to false
super(SimpleConsumer, self).__init__(client, group, topic,
partitions=partitions,
auto_commit=auto_commit,
auto_commit_every_n=auto_commit_every_n,
auto_commit_every_t=auto_commit_every_t)
def provide_partition_info(self):
"""
Indicates that partition info must be returned by the consumer
"""
self.partition_info = True
def seek(self, offset, whence):
"""
Alter the current offset in the consumer, similar to fseek
offset: how much to modify the offset
whence: where to modify it from
0 is relative to the earliest available offset (head)
1 is relative to the current offset
2 is relative to the latest known offset (tail)
"""
if whence == 1: # relative to current position
for partition, _offset in self.offsets.items():
self.offsets[partition] = _offset + offset
elif whence in (0, 2): # relative to beginning or end
# divide the request offset by number of partitions,
# distribute the remained evenly
(delta, rem) = divmod(offset, len(self.offsets))
deltas = {}
for partition, r in izip_longest(self.offsets.keys(),
repeat(1, rem), fillvalue=0):
deltas[partition] = delta + r
reqs = []
for partition in self.offsets.keys():
if whence == 0:
reqs.append(OffsetRequest(self.topic, partition, -2, 1))
elif whence == 2:
reqs.append(OffsetRequest(self.topic, partition, -1, 1))
# The API returns back the next available offset
# For eg: if the current offset is 18, the API will return
# back 19. So, if we have to seek 5 points before, we will
# end up going back to 14, instead of 13. Adjust this
deltas[partition] -= 1
else:
pass
resps = self.client.send_offset_request(reqs)
for resp in resps:
self.offsets[resp.partition] = resp.offsets[0] + \
deltas[resp.partition]
else:
raise ValueError("Unexpected value for `whence`, %d" % whence)
def get_messages(self, count=1, block=True, timeout=0.1):
"""
Fetch the specified number of messages
count: Indicates the maximum number of messages to be fetched
block: If True, the API will block till some messages are fetched.
timeout: If None, and block=True, the API will block infinitely.
If >0, API will block for specified time (in seconds)
"""
messages = []
iterator = self.__iter__()
# HACK: This splits the timeout between available partitions
timeout = timeout * 1.0 / len(self.offsets)
with FetchContext(self, block, timeout):
while count > 0:
try:
messages.append(next(iterator))
except StopIteration as exp:
break
count -= 1
return messages
def __iter__(self):
"""
Create an iterate per partition. Iterate through them calling next()
@@ -218,7 +320,10 @@ class SimpleConsumer(object):
for partition, it in iters.items():
try:
yield it.next()
if self.partition_info:
yield (partition, it.next())
else:
yield it.next()
except StopIteration:
log.debug("Done iterating over partition %s" % partition)
del iters[partition]
@@ -238,10 +343,23 @@ class SimpleConsumer(object):
the end of this partition.
"""
# The offset that is stored in the consumer is the offset that
# we have consumed. In subsequent iterations, we are supposed to
# fetch the next message (that is from the next offset)
# However, for the 0th message, the offset should be as-is.
# An OffsetFetchRequest to Kafka gives 0 for a new queue. This is
# problematic, since 0 is offset of a message which we have not yet
# consumed.
if self.fetch_started[partition]:
offset += 1
while True:
# TODO: configure fetch size
req = FetchRequest(self.topic, partition, offset, 1024)
(resp,) = self.client.send_fetch_request([req])
(resp,) = self.client.send_fetch_request([req],
max_wait_time=self.fetch_max_wait_time,
min_bytes=self.fetch_min_bytes)
assert resp.topic == self.topic
assert resp.partition == partition
@@ -249,10 +367,225 @@ class SimpleConsumer(object):
next_offset = None
for message in resp.messages:
next_offset = message.offset
yield message
# update the internal state _after_ we yield the message
# update the offset before the message is yielded. This is
# so that the consumer state is not lost in certain cases.
# For eg: the message is yielded and consumed by the caller,
# but the caller does not come back into the generator again.
# The message will be consumed but the status will not be
# updated in the consumer
self.fetch_started[partition] = True
self.offsets[partition] = message.offset
yield message
if next_offset is None:
break
else:
offset = next_offset + 1
class MultiProcessConsumer(Consumer):
"""
A consumer implementation that consumes partitions for a topic in
parallel using multiple processes
client: a connected KafkaClient
group: a name for this consumer, used for offset storage and must be unique
topic: the topic to consume
auto_commit: default True. Whether or not to auto commit the offsets
auto_commit_every_n: default 100. How many messages to consume
before a commit
auto_commit_every_t: default 5000. How much time (in milliseconds) to
wait before commit
num_procs: Number of processes to start for consuming messages.
The available partitions will be divided among these processes
partitions_per_proc: Number of partitions to be allocated per process
(overrides num_procs)
Auto commit details:
If both auto_commit_every_n and auto_commit_every_t are set, they will
reset one another when one is triggered. These triggers simply call the
commit method on this class. A manual call to commit will also reset
these triggers
"""
def __init__(self, client, group, topic, auto_commit=True,
auto_commit_every_n=AUTO_COMMIT_MSG_COUNT,
auto_commit_every_t=AUTO_COMMIT_INTERVAL,
num_procs=1, partitions_per_proc=0):
# Initiate the base consumer class
super(MultiProcessConsumer, self).__init__(client, group, topic,
partitions=None,
auto_commit=auto_commit,
auto_commit_every_n=auto_commit_every_n,
auto_commit_every_t=auto_commit_every_t)
# Variables for managing and controlling the data flow from
# consumer child process to master
self.queue = Queue(1024) # Child consumers dump messages into this
self.start = Event() # Indicates the consumers to start fetch
self.exit = Event() # Requests the consumers to shutdown
self.pause = Event() # Requests the consumers to pause fetch
self.size = Value('i', 0) # Indicator of number of messages to fetch
partitions = self.offsets.keys()
# If unspecified, start one consumer per partition
# The logic below ensures that
# * we do not cross the num_procs limit
# * we have an even distribution of partitions among processes
if not partitions_per_proc:
partitions_per_proc = round(len(partitions) * 1.0 / num_procs)
if partitions_per_proc < num_procs * 0.5:
partitions_per_proc += 1
# The final set of chunks
chunker = lambda *x: [] + list(x)
chunks = map(chunker, *[iter(partitions)] * int(partitions_per_proc))
self.procs = []
for chunk in chunks:
chunk = filter(lambda x: x is not None, chunk)
proc = Process(target=self._consume, args=(chunk,))
proc.daemon = True
proc.start()
self.procs.append(proc)
def _consume(self, partitions):
"""
A child process worker which consumes messages based on the
notifications given by the controller process
"""
# Make the child processes open separate socket connections
self.client.reinit()
# We will start consumers without auto-commit. Auto-commit will be
# done by the master controller process.
consumer = SimpleConsumer(self.client, self.group, self.topic,
partitions=partitions,
auto_commit=False,
auto_commit_every_n=None,
auto_commit_every_t=None)
# Ensure that the consumer provides the partition information
consumer.provide_partition_info()
while True:
# Wait till the controller indicates us to start consumption
self.start.wait()
# If we are asked to quit, do so
if self.exit.is_set():
break
# Consume messages and add them to the queue. If the controller
# indicates a specific number of messages, follow that advice
count = 0
for partition, message in consumer:
self.queue.put((partition, message))
count += 1
# We have reached the required size. The controller might have
# more than what he needs. Wait for a while.
# Without this logic, it is possible that we run into a big
# loop consuming all available messages before the controller
# can reset the 'start' event
if count == self.size.value:
self.pause.wait()
break
# In case we did not receive any message, give up the CPU for
# a while before we try again
if count == 0:
time.sleep(0.1)
consumer.stop()
def stop(self):
# Set exit and start off all waiting consumers
self.exit.set()
self.pause.set()
self.start.set()
for proc in self.procs:
proc.join()
proc.terminate()
super(MultiProcessConsumer, self).stop()
def __iter__(self):
"""
Iterator to consume the messages available on this consumer
"""
# Trigger the consumer procs to start off.
# We will iterate till there are no more messages available
self.size.value = 0
self.pause.set()
while True:
self.start.set()
try:
# We will block for a small while so that the consumers get
# a chance to run and put some messages in the queue
# TODO: This is a hack and will make the consumer block for
# at least one second. Need to find a better way of doing this
partition, message = self.queue.get(block=True, timeout=1)
except Empty:
break
# Count, check and commit messages if necessary
self.offsets[partition] = message.offset
self.start.clear()
yield message
self.count_since_commit += 1
self._auto_commit()
self.start.clear()
def get_messages(self, count=1, block=True, timeout=10):
"""
Fetch the specified number of messages
count: Indicates the maximum number of messages to be fetched
block: If True, the API will block till some messages are fetched.
timeout: If None, and block=True, the API will block infinitely.
If >0, API will block for specified time (in seconds)
"""
messages = []
# Give a size hint to the consumers. Each consumer process will fetch
# a maximum of "count" messages. This will fetch more messages than
# necessary, but these will not be committed to kafka. Also, the extra
# messages can be provided in subsequent runs
self.size.value = count
self.pause.clear()
while count > 0:
# Trigger consumption only if the queue is empty
# By doing this, we will ensure that consumers do not
# go into overdrive and keep consuming thousands of
# messages when the user might need only a few
if self.queue.empty():
self.start.set()
try:
partition, message = self.queue.get(block, timeout)
except Empty:
break
messages.append(message)
# Count, check and commit messages if necessary
self.offsets[partition] = message.offset
self.count_since_commit += 1
self._auto_commit()
count -= 1
self.size.value = 0
self.start.clear()
self.pause.set()
return messages

129
test/test_integration.py
View File

@@ -1,6 +1,7 @@
import logging
import unittest
import time
from datetime import datetime
from kafka import * # noqa
from kafka.common import * # noqa
@@ -544,7 +545,7 @@ class TestKafkaClient(unittest.TestCase):
producer.stop()
class TestSimpleConsumer(unittest.TestCase):
class TestConsumer(unittest.TestCase):
@classmethod
def setUpClass(cls): # noqa
cls.zk = ZookeeperFixture.instance()
@@ -559,9 +560,9 @@ class TestSimpleConsumer(unittest.TestCase):
cls.server2.close()
cls.zk.close()
def test_consumer(self):
def test_simple_consumer(self):
# Produce 100 messages to partition 0
produce1 = ProduceRequest("test_consumer", 0, messages=[
produce1 = ProduceRequest("test_simple_consumer", 0, messages=[
create_message("Test message 0 %d" % i) for i in range(100)
])
@@ -570,7 +571,7 @@ class TestSimpleConsumer(unittest.TestCase):
self.assertEquals(resp.offset, 0)
# Produce 100 messages to partition 1
produce2 = ProduceRequest("test_consumer", 1, messages=[
produce2 = ProduceRequest("test_simple_consumer", 1, messages=[
create_message("Test message 1 %d" % i) for i in range(100)
])
@@ -579,7 +580,7 @@ class TestSimpleConsumer(unittest.TestCase):
self.assertEquals(resp.offset, 0)
# Start a consumer
consumer = SimpleConsumer(self.client, "group1", "test_consumer")
consumer = SimpleConsumer(self.client, "group1", "test_simple_consumer")
all_messages = []
for message in consumer:
all_messages.append(message)
@@ -602,31 +603,141 @@ class TestSimpleConsumer(unittest.TestCase):
self.assertEquals(len(all_messages), 13)
# Blocking API
start = datetime.now()
messages = consumer.get_messages(block=True, timeout=5)
diff = (datetime.now() - start).total_seconds()
self.assertGreaterEqual(diff, 5)
self.assertEqual(len(messages), 0)
# Send 10 messages
produce = ProduceRequest("test_simple_consumer", 0, messages=[
create_message("Test message 0 %d" % i) for i in range(10)
])
for resp in self.client.send_produce_request([produce]):
self.assertEquals(resp.error, 0)
self.assertEquals(resp.offset, 100)
# Fetch 5 messages
messages = consumer.get_messages(count=5, block=True, timeout=5)
self.assertEqual(len(messages), 5)
# Fetch 10 messages
start = datetime.now()
messages = consumer.get_messages(count=10, block=True, timeout=5)
self.assertEqual(len(messages), 5)
diff = (datetime.now() - start).total_seconds()
self.assertGreaterEqual(diff, 5)
consumer.stop()
def test_pending(self):
def test_simple_consumer_pending(self):
# Produce 10 messages to partition 0 and 1
produce1 = ProduceRequest("test_pending", 0, messages=[
produce1 = ProduceRequest("test_simple_pending", 0, messages=[
create_message("Test message 0 %d" % i) for i in range(10)
])
for resp in self.client.send_produce_request([produce1]):
self.assertEquals(resp.error, 0)
self.assertEquals(resp.offset, 0)
produce2 = ProduceRequest("test_pending", 1, messages=[
produce2 = ProduceRequest("test_simple_pending", 1, messages=[
create_message("Test message 1 %d" % i) for i in range(10)
])
for resp in self.client.send_produce_request([produce2]):
self.assertEquals(resp.error, 0)
self.assertEquals(resp.offset, 0)
consumer = SimpleConsumer(self.client, "group1", "test_pending")
consumer = SimpleConsumer(self.client, "group1", "test_simple_pending")
self.assertEquals(consumer.pending(), 20)
self.assertEquals(consumer.pending(partitions=[0]), 10)
self.assertEquals(consumer.pending(partitions=[1]), 10)
consumer.stop()
def test_multi_process_consumer(self):
# Produce 100 messages to partition 0
produce1 = ProduceRequest("test_mpconsumer", 0, messages=[
create_message("Test message 0 %d" % i) for i in range(100)
])
for resp in self.client.send_produce_request([produce1]):
self.assertEquals(resp.error, 0)
self.assertEquals(resp.offset, 0)
# Produce 100 messages to partition 1
produce2 = ProduceRequest("test_mpconsumer", 1, messages=[
create_message("Test message 1 %d" % i) for i in range(100)
])
for resp in self.client.send_produce_request([produce2]):
self.assertEquals(resp.error, 0)
self.assertEquals(resp.offset, 0)
# Start a consumer
consumer = MultiProcessConsumer(self.client, "grp1", "test_mpconsumer")
all_messages = []
for message in consumer:
all_messages.append(message)
self.assertEquals(len(all_messages), 200)
# Make sure there are no duplicates
self.assertEquals(len(all_messages), len(set(all_messages)))
# Blocking API
start = datetime.now()
messages = consumer.get_messages(block=True, timeout=5)
diff = (datetime.now() - start).total_seconds()
self.assertGreaterEqual(diff, 5)
self.assertEqual(len(messages), 0)
# Send 10 messages
produce = ProduceRequest("test_mpconsumer", 0, messages=[
create_message("Test message 0 %d" % i) for i in range(10)
])
for resp in self.client.send_produce_request([produce]):
self.assertEquals(resp.error, 0)
self.assertEquals(resp.offset, 100)
# Fetch 5 messages
messages = consumer.get_messages(count=5, block=True, timeout=5)
self.assertEqual(len(messages), 5)
# Fetch 10 messages
start = datetime.now()
messages = consumer.get_messages(count=10, block=True, timeout=5)
self.assertEqual(len(messages), 5)
diff = (datetime.now() - start).total_seconds()
self.assertGreaterEqual(diff, 5)
consumer.stop()
def test_multi_proc_pending(self):
# Produce 10 messages to partition 0 and 1
produce1 = ProduceRequest("test_mppending", 0, messages=[
create_message("Test message 0 %d" % i) for i in range(10)
])
for resp in self.client.send_produce_request([produce1]):
self.assertEquals(resp.error, 0)
self.assertEquals(resp.offset, 0)
produce2 = ProduceRequest("test_mppending", 1, messages=[
create_message("Test message 1 %d" % i) for i in range(10)
])
for resp in self.client.send_produce_request([produce2]):
self.assertEquals(resp.error, 0)
self.assertEquals(resp.offset, 0)
consumer = MultiProcessConsumer(self.client, "group1", "test_mppending")
self.assertEquals(consumer.pending(), 20)
self.assertEquals(consumer.pending(partitions=[0]), 10)
self.assertEquals(consumer.pending(partitions=[1]), 10)
consumer.stop()
if __name__ == "__main__":
logging.basicConfig(level=logging.DEBUG)