Hadoop Name 无法启动 Caused by: java.net.BindException: Address already in use

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启动hadoop 后，jps如下,没有datanode

查看hadoop/log 下的namenode日志如下

9829 ResourceManager
6887 Worker
2615 Main
9657 SecondaryNameNode
9993 NodeManager
5500 Launcher
4685 Launcher
6798 Master
9470 DataNode

2018-08-28 14:35:18,334 INFO org.apache.hadoop.http.HttpServer2: HttpServer.start() threw a non Bind IOException
java.net.BindException: Port in use: 0.0.0.0:50070
    at org.apache.hadoop.http.HttpServer2.openListeners(HttpServer2.java:998)
    at org.apache.hadoop.http.HttpServer2.start(HttpServer2.java:935)
    at org.apache.hadoop.hdfs.server.namenode.NameNodeHttpServer.start(NameNodeHttpServer.java:171)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.startHttpServer(NameNode.java:842)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:693)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:906)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:885)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1626)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1694)
Caused by: java.net.BindException: Address already in use
    at sun.nio.ch.Net.bind0(Native Method)
    at sun.nio.ch.Net.bind(Net.java:433)
    at sun.nio.ch.Net.bind(Net.java:425)
    at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
    at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
    at org.mortbay.jetty.nio.SelectChannelConnector.open(SelectChannelConnector.java:216)
    at org.apache.hadoop.http.HttpServer2.openListeners(HttpServer2.java:993)
    ... 8 more
2018-08-28 14:35:18,335 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Stopping NameNode metrics system...
2018-08-28 14:35:18,336 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: NameNode metrics system stopped.
2018-08-28 14:35:18,336 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: NameNode metrics system shutdown complete.
2018-08-28 14:35:18,336 ERROR org.apache.hadoop.hdfs.server.namenode.NameNode: Failed to start namenode.
java.net.BindException: Port in use: 0.0.0.0:50070
    at org.apache.hadoop.http.HttpServer2.openListeners(HttpServer2.java:998)
    at org.apache.hadoop.http.HttpServer2.start(HttpServer2.java:935)
    at org.apache.hadoop.hdfs.server.namenode.NameNodeHttpServer.start(NameNodeHttpServer.java:171)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.startHttpServer(NameNode.java:842)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:693)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:906)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:885)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1626)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1694)
Caused by: java.net.BindException: Address already in use
    at sun.nio.ch.Net.bind0(Native Method)
    at sun.nio.ch.Net.bind(Net.java:433)
    at sun.nio.ch.Net.bind(Net.java:425)
    at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
    at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
    at org.mortbay.jetty.nio.SelectChannelConnector.open(SelectChannelConnector.java:216)
    at org.apache.hadoop.http.HttpServer2.openListeners(HttpServer2.java:993)
    ... 8 more
2018-08-28 14:35:18,337 INFO org.apache.hadoop.util.ExitUtil: Exiting with status 1
2018-08-28 14:35:18,339 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: SHUTDOWN_MSG: 

端口50070被占用导致namenode起不来，通过命令 lsof -i:50070 查看进程id，kill掉该进程然后重启hadoop即可