安装环境:vmware 安装的centos6.8 安装IP地址:192.168.52.136
kafka和zookeeper版本：kafka_2.13-2.4.0.tgz 和zookeeper-3.4.5.tar.gz
centos安装目录:
zookeeper 配置和启动就不说了
./zkServer.sh start
启动kafka
/usr/local/kafka/bin/kafka-server-start.sh /usr/local/kafka/config/server.properties
查看实时消息
./kafka-console-consumer.sh --bootstrap-server 192.168.52.136:9092 --topic test3 --from-beginning
server.properties
# Licensed to the Apache Software Foundation (ASF) under one or more # contributor license agreements. See the NOTICE file distributed with # this work for additional information regarding copyright ownership. # The ASF licenses this file to You under the Apache License, Version 2.0 # (the "License"); you may not use this file except in compliance with # the License. You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # see kafka.server.KafkaConfig for additional details and defaults ############################# Server Basics ############################# # The id of the broker. This must be set to a unique integer for each broker. broker.id=1 # Hostname and port the broker will advertise to producers and consumers. If not set, # it uses the value for "listeners" if configured. Otherwise, it will use the value # returned from java.net.InetAddress.getCanonicalHostName(). advertised.listeners=PLAINTEXT://192.168.52.136:9092 hostname=192.168.52.136 listeners=PLAINTEXT://192.168.52.136:9092 ############################# Socket Server Settings ############################# # The address the socket server listens on. It will get the value returned from # java.net.InetAddress.getCanonicalHostName() if not configured. # FORMAT: # listeners = listener_name://host_name:port # EXAMPLE: # listeners = PLAINTEXT://your.host.name:9092 # Hostname and port the broker will advertise to producers and consumers. If not set, # it uses the value for "listeners" if configured. Otherwise, it will use the value # returned from java.net.InetAddress.getCanonicalHostName(). #advertised.listeners=PLAINTEXT://192.168.52.36:9092 #listeners=PLAINTEXT://localhost:9092 # Maps listener names to security protocols, the default is for them to be the same. See the config documentation for more details #listener.security.protocol.map=PLAINTEXT:PLAINTEXT,SSL:SSL,SASL_PLAINTEXT:SASL_PLAINTEXT,SASL_SSL:SASL_SSL # The number of threads that the server uses for receiving requests from the network and sending responses to the network num.network.threads=3 # The number of threads that the server uses for processing requests, which may include disk I/O num.io.threads=8 # The send buffer (SO_SNDBUF) used by the socket server socket.send.buffer.bytes=102400 # The receive buffer (SO_RCVBUF) used by the socket server socket.receive.buffer.bytes=102400 # The maximum size of a request that the socket server will accept (protection against OOM) socket.request.max.bytes=104857600 ############################# Log Basics ############################# # A comma separated list of directories under which to store log files 不是日志 log.dirs=/tmp/kafka-logs # The default number of log partitions per topic. More partitions allow greater # parallelism for consumption, but this will also result in more files across # the brokers. num.partitions=1 # The number of threads per data directory to be used for log recovery at startup and flushing at shutdown. # This value is recommended to be increased for installations with data dirs located in RAID array. num.recovery.threads.per.data.dir=1 ############################# Internal Topic Settings ############################# # The replication factor for the group metadata internal topics "__consumer_offsets" and "__transaction_state" # For anything other than development testing, a value greater than 1 is recommended to ensure availability such as 3. offsets.topic.replication.factor=1 transaction.state.log.replication.factor=1 transaction.state.log.min.isr=1 ############################# Log Flush Policy ############################# # Messages are immediately written to the filesystem but by default we only fsync() to sync # the OS cache lazily. The following configurations control the flush of data to disk. # There are a few important trade-offs here: # 1. Durability: Unflushed data may be lost if you are not using replication. # 2. Latency: Very large flush intervals may lead to latency spikes when the flush does occur as there will be a lot of data to flush. # 3. Throughput: The flush is generally the most expensive operation, and a small flush interval may lead to excessive seeks. # The settings below allow one to configure the flush policy to flush data after a period of time or # every N messages (or both). This can be done globally and overridden on a per-topic basis. # The number of messages to accept before forcing a flush of data to disk #log.flush.interval.messages=10000 # The maximum amount of time a message can sit in a log before we force a flush #log.flush.interval.ms=1000 ############################# Log Retention Policy ############################# # The following configurations control the disposal of log segments. The policy can # be set to delete segments after a period of time, or after a given size has accumulated. # A segment will be deleted whenever *either* of these criteria are met. Deletion always happens # from the end of the log. # The minimum age of a log file to be eligible for deletion due to age log.retention.hours=168 # A size-based retention policy for logs. Segments are pruned from the log unless the remaining # segments drop below log.retention.bytes. Functions independently of log.retention.hours. #log.retention.bytes=1073741824 # The maximum size of a log segment file. When this size is reached a new log segment will be created. #1G大小 log.segment.bytes=1073741824 # The interval at which log segments are checked to see if they can be deleted according # to the retention policies log.retention.check.interval.ms=300000 ############################# Zookeeper ############################# # Zookeeper connection string (see zookeeper docs for details). # This is a comma separated host:port pairs, each corresponding to a zk # server. e.g. "127.0.0.1:3000,127.0.0.1:3001,127.0.0.1:3002". # You can also append an optional chroot string to the urls to specify the # root directory for all kafka znodes. zookeeper.connect=192.168.52.136:2181 # Timeout in ms for connecting to zookeeper zookeeper.connection.timeout.ms=60000 ############################# Group Coordinator Settings ############################# # The following configuration specifies the time, in milliseconds, that the GroupCoordinator will delay the initial consumer rebalance. # The rebalance will be further delayed by the value of group.initial.rebalance.delay.ms as new members join the group, up to a maximum of max.poll.interval.ms. # The default value for this is 3 seconds. # We override this to 0 here as it makes for a better out-of-the-box experience for development and testing. # However, in production environments the default value of 3 seconds is more suitable as this will help to avoid unnecessary, and potentially expensive, rebalances during application startup. group.initial.rebalance.delay.ms=0
java测试项目 采用maven 组织方式
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
<version>2.4.0</version>
</dependency>
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
<version>2.4.0</version>
</dependency>
</dependencies>
生产消息代码
public class ProducerDemo {
private final KafkaProducer<String, String> producer;
public final static String TOPIC = "test3";
private ProducerDemo() {
Properties props = new Properties();
props.put("bootstrap.servers", "192.168.52.136:9092");//xxx服务器ip
props.put("acks", "all");//所有follower都响应了才认为消息提交成功，即"committed"
props.put("retries", 0);//retries = MAX 无限重试，直到你意识到出现了问题:)
props.put("batch.size", 16384);//producer将试图批处理消息记录，以减少请求次数.默认的批量处理消息字节数
//batch.size当批量的数据大小达到设定值后，就会立即发送，不顾下面的linger.ms
props.put("linger.ms", 1);//延迟1ms发送，这项设置将通过增加小的延迟来完成--即，不是立即发送一条记录，producer将会等待给定的延迟时间以允许其他消息记录发送，这些消息记录可以批量处理
props.put("buffer.memory", 33554432);//producer可以用来缓存数据的内存大小。
props.put("key.serializer","org.apache.kafka.common.serialization.IntegerSerializer");
props.put("value.serializer","org.apache.kafka.common.serialization.StringSerializer");
producer = new KafkaProducer<String, String>(props);
}
public void produce() {
int messageNo = 1;
final int COUNT = 5;
while(messageNo < COUNT) {
String key = String.valueOf(messageNo);
String data = String.format("hello KafkaProducer message %s from hubo liuyahui ", key);
try {
Future f=producer.send(new ProducerRecord<String, String>(TOPIC, data));
System.out.println(f.get());
} catch (Exception e) {
e.printStackTrace();
}
messageNo++;
}
producer.close();
}
public static void main(String[] args) {
new ProducerDemo().produce();
}
}
消费消息代码
public class ConsumrTest {
public static void main(String[] args) {
String topicNmae="test3";
String groupID="test-group";
Properties props= new Properties();
props.put("bootstrap.servers","192.168.52.136:9092");
props.put("group.id",groupID);
props.put("enable.auto.commit","true");
props.put("auto.commit.interval.ms","1000");
props.put("auto.offset.reset","earliest");
props.put("key.deserializer","org.apache.kafka.common.serialization.StringDeserializer");
props.put("value.deserializer","org.apache.kafka.common.serialization.StringDeserializer");
KafkaConsumer<String,String> consumer=new KafkaConsumer<String, String>(props);
consumer.subscribe(Arrays.asList(topicNmae));
try {
while (true){
ConsumerRecords<String,String> records=consumer.poll(1000);
for (ConsumerRecord<String,String> record:records){
System.out.printf("offset = %d ,key =%s, value= %s%n" ,record.offset(),record.key(),record.value());
}
}
}finally {
consumer.close();
}
}
