问题描述
Kafka 2.8.1 ZooKeeper启动失败。
zookeeper-server-start.bat ../../config/zookeeper.properties[2023-09-04 18:21:49,497] INFO binding to port 0.0.0.0/0.0.0.0:2181 (org.apache.zookeeper.server.NIOServerCnxnFactory)
[2023-09-04 18:21:49,498] ERROR Unexpected exception, exiting abnormally (org.apache.zookeeper.server.ZooKeeperServerMain)
java.net.BindException: Address already in use: bind
at java.base/sun.nio.ch.Net.bind0(Native Method)
at java.base/sun.nio.ch.Net.bind(Net.java:555)
at java.base/sun.nio.ch.ServerSocketChannelImpl.netBind(ServerSocketChannelImpl.java:337)
at java.base/sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:294)
at java.base/sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:89)
at java.base/sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:81)
at org.apache.zookeeper.server.NIOServerCnxnFactory.configure(NIOServerCnxnFactory.java:687)
at org.apache.zookeeper.server.ZooKeeperServerMain.runFromConfig(ZooKeeperServerMain.java:144)
at org.apache.zookeeper.server.ZooKeeperServerMain.initializeAndRun(ZooKeeperServerMain.java:107)
at org.apache.zookeeper.server.ZooKeeperServerMain.main(ZooKeeperServerMain.java:65)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:128)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:82)原因分析
2181端口被占用。
打开cmd。
netstat -ano |findstr 2181无结果返回，找不到占用2181端口的程序。
解决方案
修改config/zookeeper.properties
找到：
clientPort=2181改为：
clientPort=21810重新启动ZooKeeper，启动成功。
[2023-09-04 18:32:51,963] INFO binding to port 0.0.0.0/0.0.0.0:21810 (org.apache.zookeeper.server.NIOServerCnxnFactory)
[2023-09-04 18:32:51,979] INFO zookeeper.snapshotSizeFactor = 0.33 (org.apache.zookeeper.server.ZKDatabase)
[2023-09-04 18:32:51,981] INFO Reading snapshot tmpzookeeperversion-2snapshot.0 (org.apache.zookeeper.server.persistence.FileSnap)
[2023-09-04 18:32:51,988] INFO Snapshotting: 0x0 to tmpzookeeperversion-2snapshot.0 (org.apache.zookeeper.server.persistence.FileTxnSnapLog)
[2023-09-04 18:32:51,999] INFO PrepRequestProcessor (sid:0) started, reconfigEnabled=false (org.apache.zookeeper.server.PrepRequestProcessor)
[2023-09-04 18:32:52,004] INFO Using checkIntervalMs=60000 maxPerMinute=10000 (org.apache.zookeeper.server.ContainerManager)记得修改config/server.properties，不然Kafka Server无法连接。
找到：
zookeeper.connect=localhost:2181改为：
zookeeper.connect=localhost:2181