kafka學習(1)linux下的安裝和啟動,以及Java示例程式碼
1. 安裝
1.1 下載kafka並解壓
wget http://mirror.bit.edu.cn/apache/kafka/0.11.0.0/kafka_2.11-0.11.0.0.tgz
tar -zxvf kafka_2.11-0.11.0.0.tgz
1.2 修改配置
(1)配置zookeeper地址
vim /data/kafka_2.11-0.11.0.0/config/server.properties
zookeeper.connect=localhost:2181,localhost:2182,localhost:2183
(2)配置記憶體
vim /data/kafka_2.11-0.11.0.0/bin/kafka-server-start.sh
if [ "x$KAFKA_HEAP_OPTS" = "x" ]; then
export KAFKA_HEAP_OPTS="-Xmx256m -Xms256m"
fi
(3)敲黑板!修改對外的IP地址,否則kafka在別的機器上無法釋出和訂閱
[[email protected] kafka_2.11-0.11.0.0]# vim config/server.properties
advertised.listeners=PLAINTEXT://123.56.13.70:9092
1.3 啟動
sh /data/kafka_2.11-0.11.0.0/bin/kafka-server -start.sh /data/kafka_2.11-0.11.0.0/config/server.properties
2. 傳送和訂閱訊息
2.1 建立主題
bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic test
2.2 檢視主題
[[email protected] kafka_2.11-0.11.0.0]# bin/kafka-topics.sh --list --zookeeper localhost:2181
test
2.3 傳送訊息produce
[[email protected] kafka_2.11-0.11.0.0]# bin/kafka-console-producer.sh --broker-list localhost:9092 --topic test
>我是高天悅
>
2.4 接收訊息consume
[root@iZ2zei0nwllapkwklisoncZ kafka_2.11-0.11.0.0]# bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic test --from-beginning
this is a msg
this is another msg
你好
3. Java API 程式碼
3.1 生產者
public static String testProduce() {
Properties props = new Properties();
props.put("bootstrap.servers", KafkaConstants.BROKER_LIST);
props.put("acks", "all");
props.put("retries", 0);
props.put("batch.size", 16384);
props.put("linger.ms", 1);
props.put("buffer.memory", 33554432);
props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
Producer<String, String> producer = new KafkaProducer<>(props);
for (int i = 0; i < 100; i++)
producer.send(
new ProducerRecord<String, String>("test", Integer.toString(i), Integer.toString(i)));
producer.close();
return "ok";
}
3.2 消費者
public static Object testConsume() {
Properties props = new Properties();
props.put("bootstrap.servers", "123.56.13.70:9092");
props.put("group.id", "d2");
props.put("enable.auto.commit", "false");
props.put("auto.commit.interval.ms", "1000");
props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
props.put("session.timeout.ms", "30000");
KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);
// consumer.subscribe(Arrays.asList("foo", "bar", "test"));
consumer.subscribe(Arrays.asList("test"));
long timeout = 10000;
while (true) {
ConsumerRecords<String, String> records = consumer.poll(timeout);
for (ConsumerRecord<String, String> record : records)
System.out.printf("offset = %d, key = %s, value = %s%n", record.offset(), record.key(),
record.value());
}
}
在控制檯和Eclipse console同時看到生產和消費之間的通訊,bingo!
tips: kafka的持久化在/tmp/kafka-logs下
[[email protected] kafka-logs]# pwd
/tmp/kafka-logs
[[email protected] kafka-logs]# ll
total 232
drwxr-xr-x 2 root root 4096 Oct 15 19:07 baotest-0
drwxr-xr-x 2 root root 4096 Oct 15 19:07 bar-0
-rw-r–r– 1 root root 0 Oct 14 21:32 cleaner-offset-checkpoint
drwxr-xr-x 2 root root 4096 Oct 15 19:23 __consumer_offsets-0
drwxr-xr-x 2 root root 4096 Oct 15 19:07 __consumer_offsets-1
….
drwxr-xr-x 2 root root 4096 Oct 15 19:07 __consumer_offsets-5
drwxr-xr-x 2 root root 4096 Oct 15 19:07 __consumer_offsets-6
drwxr-xr-x 2 root root 4096 Oct 15 19:07 __consumer_offsets-7
drwxr-xr-x 2 root root 4096 Oct 15 19:07 __consumer_offsets-8
drwxr-xr-x 2 root root 4096 Oct 15 19:07 __consumer_offsets-9
drwxr-xr-x 2 root root 4096 Oct 15 19:07 foo-0
-rw-r–r– 1 root root 4 Oct 15 20:47 log-start-offset-checkpoint
-rw-r–r– 1 root root 54 Oct 14 21:33 meta.properties
-rw-r–r– 1 root root 1244 Oct 15 20:47 recovery-point-offset-checkpoint
-rw-r–r– 1 root root 1248 Oct 15 20:48 replication-offset-checkpoint
drwxr-xr-x 2 root root 4096 Oct 15 19:15 test-0
[[email protected] kafka-logs]#