namenode需要升级

java.io.IOException:
File system image contains an old layout version -18.
An upgrade to version -41 is required.
Please restart NameNode with -upgrade option.
at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:338)
at org.apache.hadoop.hdfs.server.namenode.FSDirectory.loadFSImage(FSDirectory.java:104)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.initialize(FSNamesystem.java:427)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.<init>(FSNamesystem.java:395)
at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:299)
at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:569)
at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1479)
at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1488)
2014-03-14 14:47:30,480 ERROR org.apache.hadoop.hdfs.server.namenode.NameNode: java.io.IOException:
File system image contains an old layout version -18.
An upgrade to version -41 is required.

运行hadoop namenode -upgrade，也可以将hadoop目录下的hdfs的几个文件夹全部删除（仅限于实验），hadoop namenode -format

2014-03-14 21:46:56,124 INFO org.apache.hadoop.ipc.Server: Stopping server on 9000
2014-03-14 21:46:56,125 INFO org.apache.hadoop.ipc.metrics.RpcInstrumentation: shut down
2014-03-14 21:46:56,125 ERROR org.apache.hadoop.hdfs.server.namenode.NameNode: java.net.BindException: Address already in use
at sun.nio.ch.Net.bind(Native Method)
at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:126)
at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:59)
at org.mortbay.jetty.nio.SelectChannelConnector.open(SelectChannelConnector.java:216)
at org.apache.hadoop.http.HttpServer.start(HttpServer.java:602)
at org.apache.hadoop.hdfs.server.namenode.NameNode$1.run(NameNode.java:517)
at org.apache.hadoop.hdfs.server.namenode.NameNode$1.run(NameNode.java:395)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1190)
at org.apache.hadoop.hdfs.server.namenode.NameNode.startHttpServer(NameNode.java

解决：  把9000（fs），9001(job)改成9002，9003就行啦