python如何连接kafka？
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标签：
python
kafka
老师回答
1、kafka-python安装:
# PyPI安装
pip install kafka-python
# conda安装
conda install -c conda-forge kafka-python
# anaconda自带pip安装
/root/anaconda3/bin/pip install kafka-python2、kafka-python生产者
producer.py
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import datetime
import json
import time
import uuid
from kafka import KafkaProducer
from kafka.errors import KafkaError
producer = KafkaProducer(bootstrap_servers='100.69.222.221:9092,100.69.222.222:9092,100.69.222.223:9092')
topic = 'test_20181105'
def test():
print('begin')
try:
n = 0
while True:
dic = {}
dic['id'] = n
n = n + 1
dic['myuuid'] = str(uuid.uuid4().hex)
dic['time'] = datetime.datetime.now().strftime("%Y%m%d %H:%M:%S")
producer.send(topic, json.dumps(dic).encode())
print("send:" + json.dumps(dic))
time.sleep(0.5)
except KafkaError as e:
print(e)
finally:
producer.close()
print('done')
if __name__ == '__main__':
test()服务器集群中配置好Kafka, 修改上面程序中的ip地址和端口号, 执行python脚本就可以成功将消息发送到 topic: test_20181105
send:{"id": 1411, "myuuid": "a25a3d0361f94d3b8fffd5967ab5df01", "time": "20181105 16:11:14"}
send:{"id": 1412, "myuuid": "784efd5389564194941240dca66233b6", "time": "20181105 16:11:14"}
send:{"id": 1413, "myuuid": "6a211195319e447aa559614662f70590", "time": "20181105 16:11:15"}
send:{"id": 1414, "myuuid": "2cc45bd82baf4a1cb41ea4786e50a0df", "time": "20181105 16:11:15"}
send:{"id": 1415, "myuuid": "b7dfed4919c74164b83cf3ec28e257b6", "time": "20181105 16:11:16"}
send:{"id": 1416, "myuuid": "9218eceb17834c228f5ab01ca7595272", "time": "20181105 16:11:16"}
send:{"id": 1417, "myuuid": "c2751c54c390453f9eedd417fb1e5a31", "time": "20181105 16:11:17"}
send:{"id": 1418, "myuuid": "9bbc4ef2cfbb42148332eb979b1142cb", "time": "20181105 16:11:17"}
send:{"id": 1419, "myuuid": "f4998a862494445c976137793b55ed73", "time": "20181105 16:11:18"}3、kafka-python消费者
consumer.py
#!/bin/env python
from kafka import KafkaConsumer
# connect to Kafka server and pass the topic we want to consume
consumer = KafkaConsumer('test_20181105',group_id = 'test_group2', bootstrap_servers='100.69.222.221:9092,100.69.222.222:9092,100.69.222.223:9092')
try:
for msg in consumer:
print(msg)
# print("%s:%d:%d: key=%s value=%s" % (msg.topic, msg.partition, msg.offset, msg.key, msg.value))
except KeyboardInterrupt as e:
print(e)同样修改上面的Ip地址和端口号,就可以接收 topic: test_20181105上的消息:
ConsumerRecord(topic='test_20181105', partition=1, offset=951, timestamp=1541405600340, timestamp_type=0, key=None, value=b'{"id": 1663, "myuuid": "0f744021b2d9468886908ee6685a0fdb", "time": "20181105 16:13:20"}', checksum=1357895145, serialized_key_size=-1, serialized_value_size=87)
ConsumerRecord(topic='test_20181105', partition=0, offset=935, timestamp=1541405600841, timestamp_type=0, key=None, value=b'{"id": 1664, "myuuid": "9379f68f656644bdb2d30911f06240e4", "time": "20181105 16:13:20"}', checksum=-715594646, serialized_key_size=-1, serialized_value_size=87)
ConsumerRecord(topic='test_20181105', partition=1, offset=952, timestamp=1541405601341, timestamp_type=0, key=None, value=b'{"id": 1665, "myuuid": "f4a5fa5b32cd4b7991612b626bea4b0e", "time": "20181105 16:13:21"}', checksum=-2068072013, serialized_key_size=-1, serialized_value_size=87)可以通过设置不同的group_id 来实现消息队列或消息订阅:
如果所有的consumer都具有相同的group,这种情况和queue模式很像;消息将会在consumers之间负载均衡.
如果所有的consumer都具有不同的group,那这就是"发布-订阅";消息将会广播给所有的消费者.
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