如何解决为什么不能在Kafka上正确使用消费者? kafka1 kafka2 kafka3 kafka1 kafka2 kafka3
有3个kafka服务器
在所有3台服务器上设置/etc/hosts
。
192.168.0.1 kafka1
192.168.0.2 kafka2
192.168.0.3 kafka3
通过配置将Zookeeper和kafka安装在所有它们上
/usr/local/kafka_2.12-2.6.0/config/server.properties
kafka1
#
broker.id=1
listeners=PLAINTEXT://kafka1:9092
advertised.listeners=PLAINTEXT://kafka1:9092
kafka2
#
broker.id=2
listeners=PLAINTEXT://kafka2:9092
advertised.listeners=PLAINTEXT://kafka2:9092
kafka3
#
broker.id=3
listeners=PLAINTEXT://kafka3:9092
advertised.listeners=PLAINTEXT://kafka3:9092
启动zookeeper和kafka之后,创建一个新主题
[kafka@kafka1 ~]$ bin/kafka-topics.sh --create --zookeeper kafka1:2181,kafka2:2181,kafka3:2181 --replication-factor 1 --partitions 6 --topic topic1 --config cleanup.policy=delete --config delete.retention.ms=60000
检查所有三个节点上的群集状态
kafka1
[kafka@kafka1 ~]$ bin/kafka-topics.sh --describe --zookeeper kafka1:2181 --topic topic1
Topic: topic1 PartitionCount: 6 ReplicationFactor: 1 Configs: cleanup.policy=delete,delete.retention.ms=60000
Topic: topic1 Partition: 0 Leader: 2 Replicas: 2 Isr: 2
Topic: topic1 Partition: 1 Leader: 3 Replicas: 3 Isr: 3
Topic: topic1 Partition: 2 Leader: 1 Replicas: 1 Isr: 1
Topic: topic1 Partition: 3 Leader: 2 Replicas: 2 Isr: 2
Topic: topic1 Partition: 4 Leader: 3 Replicas: 3 Isr: 3
Topic: topic1 Partition: 5 Leader: 1 Replicas: 1 Isr: 1
kafka2
[kafka@kafka2 ~]$ bin/kafka-topics.sh --describe --zookeeper kafka1:2181 --topic topic1
Topic: topic1 PartitionCount: 6 ReplicationFactor: 1 Configs: cleanup.policy=delete,delete.retention.ms=60000
Topic: topic1 Partition: 0 Leader: 2 Replicas: 2 Isr: 2
Topic: topic1 Partition: 1 Leader: 3 Replicas: 3 Isr: 3
Topic: topic1 Partition: 2 Leader: 1 Replicas: 1 Isr: 1
Topic: topic1 Partition: 3 Leader: 2 Replicas: 2 Isr: 2
Topic: topic1 Partition: 4 Leader: 3 Replicas: 3 Isr: 3
Topic: topic1 Partition: 5 Leader: 1 Replicas: 1 Isr: 1
kafka3
[kafka@kafka3 ~]$ bin/kafka-topics.sh --describe --zookeeper kafka1:2181 --topic topic1
Topic: topic1 PartitionCount: 6 ReplicationFactor: 1 Configs: cleanup.policy=delete,delete.retention.ms=60000
Topic: topic1 Partition: 0 Leader: 2 Replicas: 2 Isr: 2
Topic: topic1 Partition: 1 Leader: 3 Replicas: 3 Isr: 3
Topic: topic1 Partition: 2 Leader: 1 Replicas: 1 Isr: 1
Topic: topic1 Partition: 3 Leader: 2 Replicas: 2 Isr: 2
Topic: topic1 Partition: 4 Leader: 3 Replicas: 3 Isr: 3
Topic: topic1 Partition: 5 Leader: 1 Replicas: 1 Isr: 1
但是当测试集群时,在kafka1上创建了一个生产器
[kafka@kafka1 ~]$ bin/kafka-console-producer.sh --broker-list kafka1:9092 --topic topic1
>
在其他任何节点(包括当前kafka1节点)上,运行consumer
bin/kafka-console-consumer.sh --bootstrap-server kafka1:9092 --topic topic1
遇到相同的错误:
# kafka1
[2020-08-21 02:09:57,299] WARN [Consumer clientId=consumer-console-consumer-39789-1,groupId=console-consumer-39789] Connection to node 2147483645 (kafka2/192.168.0.2:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
# kafka2
[2020-08-21 03:05:00,573] WARN [Consumer clientId=consumer-console-consumer-71891-1,groupId=console-consumer-71891] Connection to node -1 (kafka1/192.168.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
# kafka3
[2020-08-21 03:05:14,331] WARN [Consumer clientId=consumer-console-consumer-55574-1,groupId=console-consumer-55574] Connection to node -1 (kafka1/192.168.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
在/usr/local/kafka_2.12-2.6.0/config/server.properties
中,我还尝试设置为
listeners=PLAINTEXT://localhost:9092
advertised.listeners=PLAINTEXT://localhost:9092
在所有3个节点上。但是同样的问题。
解决方法
“侦听器”应代表生产者和使用者可以访问的节点FQDN和端口。 当生产者/消费者连接到Kafka时,就像在您的帖子中一样:
bin/kafka-console-consumer.sh --bootstrap-server kafka1:9092 --topic topic1
它打开到kafka1:9092的连接,然后从Kafka获取包含所有代理,它们的FQDN,PORT以及每个代理领导的主题分区的集群图。
您设法创建了使用Zookeeper完成且有效的主题。
根据您的WARN日志,“ broker1,2,3”被解析为192.168.0.1/2/3,因此IP解析正常。
尝试检查端口9092上的网络连接: 来自broker1运行:“ telnet broker2 9092”
或运行生产者命令以访问远程代理,即:
[kafka@**kafka1** ~]$ bin/kafka-console-producer.sh --broker-list **kafka2**:9092 --topic topic1
这将告诉您是否能够在端口9092上从broker1连接到broker2。
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