kafka安装前期准备:
1,准备三个节点(根据自己需求决定)
2,三个节点上安装好zookeeper(也可以使用kafka自带的zookeeper)
3,关闭防火墙
chkconfig iptables off
一、下载安装包
Kafka官网下载安装包 http://kafka.apache.org/downloads.html
找到 Binary downloads(已编译好的): 下载后解压
Mac:
$ brew cask install homebrew/cask-versions/adoptopenjdk8
$ brew install kafka
软件位置 /usr/local/Cellar/zookeeper /usr/local/Cellar/kafka 配置文件位置 /usr/local/etc/kafka/zookeeper.properties
/usr/local/etc/kafka/server.properties
备注:后续操作均需进入 /usr/local/Cellar/kafka/xxxx/bin 目录下。
启动zookeeper
zookeeper-server-start /usr/local/etc/kafka/zookeeper.properties
启动kafka服务
kafka-server-start /usr/local/etc/kafka/server.properties或者
$ brew services start zookeeper
$ brew services start kafka
创建topic
kafka-topics --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic test1查看创建的topic
kafka-topics --list --zookeeper localhost:2181生产数据
kafka-console-producer --broker-list localhost:9092 --topic test1
消费数据
kafka-console-consumer --bootstrap-server 127.0.0.1:9092 --topic test1 --from-beginning
备注:--from-beginning 将从第一个消息还是接收go操作kafka
Kafka是一种高吞吐量的分布式发布订阅消息系统,它可以处理消费者规模的网站中的所有动作流数据,具有高性能、持久化、多副本备份、横向扩展等特点。本文介绍了如何使用Go语言发送和接收kafka消息。
sarama
Go语言中连接kafka使用第三方库:github.com/Shopify/sarama。
下载及安装
$ go get github.com/Shopify/sarama
注意事项
sarama
v1.20之后的版本加入了zstd
压缩算法,需要用到cgo,在Windows平台编译时会提示类似如下错误:
# github.com/DataDog/zstd
exec: "gcc":executable file not found in %PATH%
所以在Windows平台请使用v1.19版本的sarama。
连接kafka发送消息
package main import ( "fmt" "github.com/Shopify/sarama" ) // 基于sarama第三方库开发的kafka client func main() { config := sarama.NewConfig() config.Producer.RequiredAcks = sarama.WaitForAll // 发送完数据需要leader和follow都确认 config.Producer.Partitioner = sarama.NewRandomPartitioner // 新选出一个partition config.Producer.Return.Successes = true // 成功交付的消息将在success channel返回 // 构造一个消息 msg := &sarama.ProducerMessage{} msg.Topic = "web_log" msg.Value = sarama.StringEncoder("this is a test log") // 连接kafka client, err := sarama.NewSyncProducer([]string{"192.168.1.7:9092"}, config) if err != nil { fmt.Println("producer closed, err:", err) return } defer client.Close() // 发送消息 pid, offset, err := client.SendMessage(msg) if err != nil { fmt.Println("send msg failed, err:", err) return } fmt.Printf("pid:%v offset:%v\n", pid, offset) }
连接kafka消费消息
package main import ( "fmt" "github.com/Shopify/sarama" ) // kafka consumer func main() { consumer, err := sarama.NewConsumer([]string{"127.0.0.1:9092"}, nil) if err != nil { fmt.Printf("fail to start consumer, err:%v\n", err) return } partitionList, err := consumer.Partitions("web_log") // 根据topic取到所有的分区 if err != nil { fmt.Printf("fail to get list of partition:err%v\n", err) return } fmt.Println(partitionList) for partition := range partitionList { // 遍历所有的分区 // 针对每个分区创建一个对应的分区消费者 pc, err := consumer.ConsumePartition("web_log", int32(partition), sarama.OffsetNewest) if err != nil { fmt.Printf("failed to start consumer for partition %d,err:%v\n", partition, err) return } defer pc.AsyncClose() // 异步从每个分区消费信息 go func(sarama.PartitionConsumer) { for msg := range pc.Messages() { fmt.Printf("Partition:%d Offset:%d Key:%v Value:%v", msg.Partition, msg.Offset, msg.Key, msg.Value) } }(pc) } }
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