1 partitions have leader brokers without a matching listener, including [baidd-0] (org.apache.kafka.
一 故障描述
9月22日，全国kafka集群中的其中一台kafka因磁盘空间不足宕机后，业务会受到影响，无法生产与消费消息。程序报错：
WARN [Consumer clientId=consumer-1, groupId=console-consumer-55928] 1 partitions have leader brokers without a matching listener, including [baidd-0] (org.apache.kafka.clients.NetworkClient)
二 故障模拟
2.1 topic分区的replicas为1时情形
#生产消息
[root@Centos7-Mode-V8 kafka]# bin/kafka-console-producer.sh --broker-list 192.168.144.247:9193,192.168.144.251:9193,192.168.144.253:9193 --topic baidd
>aa
>bb
#消费消息：
[root@Centos7-Mode-V8 kafka]# bin/kafka-console-consumer.sh -bootstrap-server 192.168.144.247:9193,192.168.144.251:9193,192.168.144.253:9193 --topic baidd
aa
bb
2.1.1 模拟关掉该topic所属leader节点
#用kafka tool查看该topic的分区的leader在哪个节点上
/*
用kafka命令也可以看
bin/kafka-topics.sh --zookeeper 192.168.144.247:3292,192.168.144.251:3292,192.168.144.253:3292 --describe
结果输出如下：
*/
关掉其leader节点，发现生产者和所有消费者进程都一直在刷如下信息：
[2021-09-23 17:09:53,495] WARN [Consumer clientId=consumer-1, groupId=console-consumer-55928] 1 partitions have leader brokers without a matching listener, including [baidd-0] (org.apache.kafka.clients.NetworkClient)
无法发送消息，也无法消费消息。
2.1.2 模拟关掉非leader节点
有时消费者进程会报错：[2021-09-23 17:21:22,480] WARN [Consumer clientId=consumer-1, groupId=console-consumer-55928] Connection to node 2147483645 (/192.168.144.253:9193) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
报错期间可以正常生产消息，但无法消费这中间产生的数据。
2.1.3 总结
在分区replicats等于1的情况下，停掉任意一个节点，都会影响业务。
其中，当某个分区leader所在节点宕机，会影响生产消息与消费消息。
当非leader节点宕机，会影响消费消息。
2.2 分区有多个副本情形
分区在无其他副本情况下，影响业务可以理解，因此尝试为topic配置多个副本，发现竟然还是影响业务：
#创建一个拥有三副本的topic
bin/kafka-topics.sh --create --zookeeper 192.168.144.247:3292,192.168.144.251:3292,192.168.144.253:3292 --replication-factor 3 --partitions 1 --topic song
#查看副本信息
[root@Centos7-Mode-V8 kafka]# bin/kafka-topics.sh --zookeeper 192.168.144.247:3292,192.168.144.251:3292,192.168.144.253:3292 --describe --topic song
Topic:song PartitionCount:1 ReplicationFactor:3 Configs:
Topic: song Partition: 0 Leader: 0 Replicas: 0,2,1 Isr: 0,2,1
#发消息
bin/kafka-console-producer.sh --broker-list 192.168.144.247:9193,192.168.144.251:9193,192.168.144.253:9193 --topic song
#消费进程1
bin/kafka-console-consumer.sh -bootstrap-server 192.168.144.247:9193,192.168.144.251:9193,192.168.144.253:9193 --topic song --group g1
#消费进程2
bin/kafka-console-consumer.sh -bootstrap-server 192.168.144.247:9193,192.168.144.251:9193,192.168.144.253:9193 --topic song --group g2
#模拟关掉该topic所属leader节点
发现还能生产消息，没有报1 partitions have leader brokers without a matching listener错了，但是发现消费者在连不上topic leader后，有时报错：
[2021-09-24 19:01:06,316] WARN [Consumer clientId=consumer-1, groupId=console-consumer-27609] Connection to node 2147483647 (/192.168.144.247:9193) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
这期间生产的数据有时没有过来，无法消费节点故障期间产生的消息。
只是为什么有了多个副本之后节点宕机还是会丢消息呢？
答：__consumer_offsets只有1个副本，会导致即使拥有多个副本的topic也无法实现高可用。
#后来通过扩kafka自带的这个topic(__consumer_offsets)的副本，可以实现其他普通topic的高可用了，虽然停掉某个节点后，还是报Broker may not be available，但是不再影响业务了。
三 故障定位
Kafka配置文件中没配置default.replication.factor=3，而该参数默认为1，表示没有其他副本，因此相当于是单点。
四 解决办法
4.1 修改default.replication.factor参数
修改所有kafka节点配置文件，调大topic的默认副本因子（该参数默认为1）：
default.replication.factor=3
设置了default.replication.factor=3，offsets.topic.replication.factor也会默认为3。
注意，不要设置了default.replication.factor=3，又设置offsets.topic.replication.factor=1，这样offsets.topic.replication.factor的值会覆盖default.replication.factor的值。
#重启kafka，使配置生效
systemctl restart kafka
4.2 为现有普通topic扩副本
可参考https://blog.csdn.net/yabingshi_tech/article/details/120443647
4.3 为__consumer_offset扩副本
方法同上，json文件如下：
{"version": 1, "partitions": [{"topic": "__consumer_offsets", "partition": 0, "replicas": [0, 1, 2 ]},{"topic": "__consumer_offsets", "partition": 1, "replicas": [0, 1, 2 ]},{"topic": "__consumer_offsets", "partition": 2, "replicas": [0, 1, 2 ]},{"topic": "__consumer_offsets", "partition": 3, "replicas": [1, 2, 0 ]},{"topic": "__consumer_offsets", "partition": 4, "replicas": [1, 2, 0 ]},{"topic": "__consumer_offsets", "partition": 5, "replicas": [1, 2, 0 ]},{"topic": "__consumer_offsets", "partition": 6, "replicas": [2, 0, 1 ]},{"topic": "__consumer_offsets", "partition": 7, "replicas": [2, 0, 1 ]},{"topic": "__consumer_offsets", "partition": 8, "replicas": [2, 0, 1 ]},{"topic": "__consumer_offsets", "partition": 9, "replicas": [0, 1, 2 ]},{"topic": "__consumer_offsets", "partition": 10, "replicas": [0, 1, 2 ]},{"topic": "__consumer_offsets", "partition": 11, "replicas": [0, 1, 2]},{"topic": "__consumer_offsets", "partition": 12, "replicas": [1, 2, 0 ]},{"topic": "__consumer_offsets", "partition": 13, "replicas": [1, 2, 0 ]},{"topic": "__consumer_offsets", "partition": 14, "replicas": [1, 2, 0 ]},{"topic": "__consumer_offsets", "partition": 15, "replicas": [2, 0, 1 ]},{"topic": "__consumer_offsets", "partition": 16, "replicas": [2, 0, 1 ]},{"topic": "__consumer_offsets", "partition": 17, "replicas": [2, 0, 1 ]},{"topic": "__consumer_offsets", "partition": 18, "replicas": [0, 1, 2 ]},{"topic": "__consumer_offsets", "partition": 19, "replicas": [0, 1, 2 ]},{"topic": "__consumer_offsets", "partition": 20, "replicas": [0, 1, 2 ]},{"topic": "__consumer_offsets", "partition": 21, "replicas": [1, 2, 0 ]},{"topic": "__consumer_offsets", "partition": 22, "replicas": [1, 2, 0 ]},{"topic": "__consumer_offsets", "partition": 23, "replicas": [1, 2, 0 ]},{"topic": "__consumer_offsets", "partition": 24, "replicas": [2, 0, 1 ]},{"topic": "__consumer_offsets", "partition": 25, "replicas": [2, 0, 1 ]},{"topic": "__consumer_offsets", "partition": 26, "replicas": [2, 0, 1 ]},{"topic": "__consumer_offsets", "partition": 27, "replicas": [0, 1, 2 ]},{"topic": "__consumer_offsets", "partition": 28, "replicas": [0, 1, 2 ]},{"topic": "__consumer_offsets", "partition": 29, "replicas": [0, 1, 2 ]},{"topic": "__consumer_offsets", "partition": 30, "replicas": [1, 2, 0 ]},{"topic": "__consumer_offsets", "partition": 31, "replicas": [1, 2, 0 ]},{"topic": "__consumer_offsets", "partition": 32, "replicas": [1, 2, 0 ]},{"topic": "__consumer_offsets", "partition": 33, "replicas": [2, 0, 1 ]},{"topic": "__consumer_offsets", "partition": 34, "replicas": [2, 0, 1 ]},{"topic": "__consumer_offsets", "partition": 35, "replicas": [2, 0, 1 ]},{"topic": "__consumer_offsets", "partition": 36, "replicas": [0, 1, 2 ]},{"topic": "__consumer_offsets", "partition": 37, "replicas": [0, 1, 2 ]},{"topic": "__consumer_offsets", "partition": 38, "replicas": [0, 1, 2 ]},{"topic": "__consumer_offsets", "partition": 39, "replicas": [1, 2, 0 ]},{"topic": "__consumer_offsets", "partition": 40, "replicas": [1, 2, 0 ]},{"topic": "__consumer_offsets", "partition": 41, "replicas": [1, 2, 0 ]},{"topic": "__consumer_offsets", "partition": 42, "replicas": [2, 0, 1 ]},{"topic": "__consumer_offsets", "partition": 43, "replicas": [2, 0, 1 ]},{"topic": "__consumer_offsets", "partition": 44, "replicas": [2, 0, 1 ]},{"topic": "__consumer_offsets", "partition": 45, "replicas": [0, 1, 2 ]},{"topic": "__consumer_offsets", "partition": 46, "replicas": [0, 1, 2 ]},{"topic": "__consumer_offsets", "partition": 47, "replicas": [1, 2, 0 ]},{"topic": "__consumer_offsets", "partition": 48, "replicas": [1, 2, 0 ]},{"topic": "__consumer_offsets", "partition": 49, "replicas": [2, 0, 1 ]}]
}
--本篇文章参考了：Kafka突然宕机了？稳住，莫慌！
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