Kafka消费者在获取主题元数据时“找不到领导者”

Question

当我尝试使用Kafka producer and consumer（0.9.0）脚本从一个主题推/拉消息时，我得到以下错误。

[2016-01-13 02:49:40,078] ERROR Error when sending message to topic test with key: null, value: 11 bytes with error: Failed to update metadata after 60000 ms. (org.apache.kafka.clients.producer.internals.ErrorLoggingCallback)

> [2016-01-13 02:47:18,620] WARN
> [console-consumer-90116_f89a0b380f19-1452653212738-9f857257-leader-finder-thread],
> Failed to find leader for Set([test,0])
> (kafka.consumer.ConsumerFetcherManager$LeaderFinderThread)
> kafka.common.KafkaException: fetching topic metadata for topics
> [Set(test)] from broker
> [ArrayBuffer(BrokerEndPoint(0,192.168.99.100,9092))] failed   at
> kafka.client.ClientUtils$.fetchTopicMetadata(ClientUtils.scala:73)    at
> kafka.client.ClientUtils$.fetchTopicMetadata(ClientUtils.scala:94)    at
> kafka.consumer.ConsumerFetcherManager$LeaderFinderThread.doWork(ConsumerFetcherManager.scala:66)
>   at kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:63)
> Caused by: java.io.EOFException   at
> org.apache.kafka.common.network.NetworkReceive.readFromReadableChannel(NetworkReceive.java:83)
>   at
> kafka.network.BlockingChannel.readCompletely(BlockingChannel.scala:129)
>   at kafka.network.BlockingChannel.receive(BlockingChannel.scala:120)
>   at kafka.producer.SyncProducer.liftedTree1$1(SyncProducer.scala:77)
>   at
> kafka.producer.SyncProducer.kafka$producer$SyncProducer$$doSend(SyncProducer.scala:74)
>   at kafka.producer.SyncProducer.send(SyncProducer.scala:119)     at
> kafka.client.ClientUtils$.fetchTopicMetadata(ClientUtils.scala:59)
>   ... 3 more

为什么我会得到这个错误，我如何解决它？

在Mac上运行Docker容器中的所有组件。ZooKeeper和Kafka分别运行在Docker容器中。

Docker计算机(boot2docker)IP地址:192.168.99.100ZooKeeper端口:2181Kafka端口:9092

host.name=localhost
broker.id=0
port=9092
advertised.host.name=192.168.99.100
advertised.port=9092

我从kafka server Docker容器中运行以下命令。我已经创建了一个带有一个分区和复制因子为1的主题。

请注意，领导指定为0，这可能是问题的一部分。

root@f89a0b380f19:/opt/kafka/dist# ./bin/kafka-topics.sh --zookeeper 192.168.99.100:2181 --topic test --describe
Topic:test  PartitionCount:1    ReplicationFactor:1 Configs:
    Topic: test Partition: 0    Leader: 0   Replicas: 0 Isr: 0

然后我执行以下操作来发送一些消息：

root@f89a0b380f19:/opt/kafka/dist# ./bin/kafka-console-producer.sh --broker-list 192.168.99.100:9092 --topic test
one message
two message
three message
four message
[2016-01-13 02:49:40,078] ERROR Error when sending message to topic test with key: null, value: 11 bytes with error: Failed to update metadata after 60000 ms. (org.apache.kafka.clients.producer.internals.ErrorLoggingCallback)
[2016-01-13 02:50:40,080] ERROR Error when sending message to topic test with key: null, value: 11 bytes with error: Failed to update metadata after 60000 ms. (org.apache.kafka.clients.producer.internals.ErrorLoggingCallback)
[2016-01-13 02:51:40,081] ERROR Error when sending message to topic test with key: null, value: 13 bytes with error: Failed to update metadata after 60000 ms. (org.apache.kafka.clients.producer.internals.ErrorLoggingCallback)
[2016-01-13 02:52:40,083] ERROR Error when sending message to topic test with key: null, value: 12 bytes with error: Failed to update metadata after 60000 ms. (org.apache.kafka.clients.producer.internals.ErrorLoggingCallback)

root@f89a0b380f19:/opt/kafka/dist# ./bin/kafka-console-consumer.sh --zookeeper 192.168.99.100:2181 --topic test --from-beginning

我已确认端口2181和9092是打开的，可以从Kafka Docker容器中访问：

root@f89a0b380f19:/# nc -z 192.168.99.100 2181; echo $?;
0
root@f89a0b380f19:/# nc -z 192.168.99.100 9092; echo $?;
0

Answer 1

解决办法完全不是我所期望的。错误消息与实际发生的情况不符。

主要问题是将Docker中的日志目录挂载到本地文件系统。我的Docker run命令使用卷挂载将容器中的Kafkalog.dir文件夹挂载到实际挂载到我的Mac的主机VM上的本地目录。后一点才是问题所在。

例如,

docker run --name kafka -v /Users/<me>/kafka/logs:/var/opt/kafka:rw -p 9092:9092 -d kafka