前面已经介绍了如何利用Thrift Source生产数据,今天介绍如何用Kafka Sink消费数据。
其实之前已经在Flume配置文件里设置了用Kafka Sink消费数据
agent1.sinks.kafkaSink.type = org.apache.flume.sink.kafka.KafkaSink
agent1.sinks.kafkaSink.topic = TRAFFIC_LOG
agent1.sinks.kafkaSink.brokerList = 10.208.129.3:,10.208.129.4:,10.208.129.5:
agent1.sinks.kafkaSink.metadata.broker.list = 10.208.129.3:,10.208.129.4:,10.208.129.5:
agent1.sinks.kafkaSink.producer.type=sync
agent1.sinks.kafkaSink.serializer.class=kafka.serializer.DefaultEncoder
agent1.sinks.kafkaSink.channel = memoryChannel
那么当Flume的channel收到数据的时候,会根据配置文件主动把数据event发送到Kafka的broker上,所以只要安装好Kafka就可以消费收据了。
Step 1: Download the code
下载安装包并解压
> tar -xzf kafka_2.11-0.10.0.0.tgz
> cd kafka_2.11-0.10.0.0
Step 2: Start the server
Kafka是基于Zookeeperl来实现分布式协同的,因此先启动Zookeeper:
> %Zookeeper_Home%/bin/zkServer.sh start
在配置文件server.properties中把下面一句前面的注释去掉,然后启动Kafka服务器
> #listeners=PLAINTEXT://:9092
> bin/kafka-server-start.sh config/server.properties
接下来启动其他两个broker:
> cp config/server.properties config/server-1.properties
> cp config/server.properties config/server-2.properties
修改配置文件,broker.id不能重复
config/server-1.properties:
broker.id=1
config/server-2.properties:
broker.id=2
Step 3: Create a topic
创建一个TRAFFIC_LOG主题的broker,复制因子为3(因为有3个Kafka服务器集群),分区个数为1
> bin/kafka-topics.sh --create --zookeeper 10.208.129.4:2181 --replication-factor 3 --partitions 1 --topic TRAFFIC_LOG
Step 5: Start a consumer
> bin/kafka-console-consumer.sh --zookeeper 10.208.129.4:2181/kafka --topic TRAFFIC_LOG --from-beginning
topic一定要写正确了,否则消费不到数据
如果在终端看到之前接入的Thrift Source输出,那么整个Flume+Kafka算是跑通了
这里已经引入了Flume和Kafka,下一篇将介绍Kafka以及Flume和Kafka的区别