Kafka错误2_ERROR Unexpected exception, exiting abnormally异常的一种原因

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#kafka #zookeeper

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本文详细描述了在使用Zookeeper和Kafka时遇到的冲突问题，包括Zookeeper启动失败的原因分析和解决方案，以及如何正确操作Kafka避免相关错误。通过将Zookeeper关闭后再进行操作，最终成功解决了问题。

继续进行尝试，

在Slave1、Slave2、Slave3上启动zookeeper，并未关闭时，去Kafka下进行操作：

[root@Slave1 local]# cd kafka/bin
[root@Slave1 bin]# ls
kafka-console-consumer.sh            kafka-run-class.sh
kafka-console-producer.sh            kafka-server-start.sh
kafka-consumer-offset-checker.sh     kafka-server-stop.sh
kafka-consumer-perf-test.sh          kafka-simple-consumer-shell.sh
kafka-mirror-maker.sh                kafka-topics.sh
kafka-preferred-replica-election.sh  windows
kafka-producer-perf-test.sh          zookeeper-server-start.sh
kafka-reassign-partitions.sh         zookeeper-server-stop.sh
kafka-replay-log-producer.sh         zookeeper-shell.sh
kafka-replica-verification.sh
[root@Slave1 bin]# cd ..
[root@Slave1 kafka]# bin/zookeeper-server-start.sh config/zookeeper.properties

结果，发现报错：

[2015-10-10 00:02:34,464] ERROR Unexpected exception, exiting abnormally (org.apache.zookeeper.server.ZooKeeperServerMain)
java.net.BindException: Address already in use
	at sun.nio.ch.Net.bind0(Native Method)
	at sun.nio.ch.Net.bind(Net.java:444)
	at sun.nio.ch.Net.bind(Net.java:436)
	at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:214)
	at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
	at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:67)
	at org.apache.zookeeper.server.NIOServerCnxnFactory.configure(NIOServerCnxnFactory.java:95)
	at org.apache.zookeeper.server.ZooKeeperServerMain.runFromConfig(ZooKeeperServerMain.java:111)
	at org.apache.zookeeper.server.ZooKeeperServerMain.initializeAndRun(ZooKeeperServerMain.java:86)
	at org.apache.zookeeper.server.ZooKeeperServerMain.main(ZooKeeperServerMain.java:52)
	at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:116)
	at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:78)

寻找错误原因，猜测可能是因为zookeeper已经启动，

故将zookeeper关闭后，再进行操作：

[root@Slave1 kafka]# cd ../zookeeper/bin
[root@Slave1 bin]# sh zkServer.sh stop
JMX enabled by default
Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg
Stopping zookeeper ... STOPPED
[root@Slave1 bin]# cd ../../kafka
[root@Slave1 kafka]# bin/zookeeper-server-start.sh config/zookeeper.properties

此时，结果正确，不再出现上面的报错信息。