Question

我目前正在使用Python进行Kafka集成，而且我是来自PHP背景的Kafka和Python的新手。

我设法让制作人工作但是由于等待来自Kafka的确认，它没有足够快地处理每条消息。

在GitHub页面（https://github.com/Parsely/pykafka）上，有以下示例应该异步处理消息并仍然允许发送报告：

>>> with topic.get_producer(delivery_reports=True) as producer:
...     count = 0
...     while True:
...         count += 1
...         producer.produce('test msg', partition_key='{}'.format(count))
...         if count % 10**5 == 0:  # adjust this or bring lots of RAM ;)
...             while True:
...                 try:
...                     msg, exc = producer.get_delivery_report(block=False)
...                     if exc is not None:
...                         print 'Failed to deliver msg {}: {}'.format(
...                             msg.partition_key, repr(exc))
...                     else:
...                         print 'Successfully delivered msg {}'.format(
...                         msg.partition_key)
...                 except Queue.Empty:
...                     break

我修改了示例，但是从测试中我可以看到第一条消息发送成功，但是抛出了Queue.empty异常。

这是我修改后的代码：

from pykafka import KafkaClient
import Queue
import json

client = KafkaClient(hosts='1.1.1.1:9092')
topic = client.topics['test']


sync = False
# sync = True

if sync:
    with topic.get_sync_producer() as producer:
        count = 0
        while True:
            count += 1
            producer.produce('Test message ' + str(count))
            print 'Sent message ' + str(count)
else:
    with topic.get_producer(delivery_reports=True) as producer:
        count = 0
        while True:
            count += 1
            if count >= 100:
                print 'Processed 100 messages'
                break
            producer.produce('Test message ' + str(count))
            while True:
                try:
                    msg, exc = producer.get_delivery_report(block=False)
                    if exc is not None:
                        print 'Failed to deliver msg {}: {}'.format(msg.offset, repr(exc))
                    else:
                        print 'Successfully delivered msg {}'.format(msg.offset)
                except Queue.Empty:
                    print 'Queue.empty'
                    break

输出：

/Users/jim/Projects/kafka_test/env/bin/python /Users/jim/Projects/kafka_test/producer.py
Queue.empty
...
... x100
Processed 100 messages

从检查我的消费者，我可以看到所有100条消息都已成功发送，但我无法告诉我的制作人。

您对如何改进此实施有任何建议吗，更具体地说，我是如何在保持检查邮件成功的能力的同时提高吞吐量的？

Answer 1

我发现了与此相关的GitHub问题：https://github.com/Parsely/pykafka/issues/291

我通过将min_queued_messages降低到1来解决这个问题。

with topic.get_sync_producer(min_queued_messages=1) as producer:
        count = 0
        while True:
            count += 1
            time_start = time.time()
            producer.produce('Test message ' + str(count))
            time_end = time.time()

            print 'Sent message %d, %ss duration' % (count, (time_end - time_start))

当block = false

1 个答案: