hadoop nameNode 无法启动

/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG: host = master/192.168.2.1
STARTUP_MSG: args = []
STARTUP_MSG: version = 0.20.2
STARTUP_MSG: build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.20 -r 911707; compiled by 'chrisdo' on Fri Feb 19 08:07:34 UTC 2010
************************************************************/
2015-10-17 09:09:11,197 INFO org.apache.hadoop.ipc.metrics.RpcMetrics: Initializing RPC Metrics with hostName=NameNode, port=9000
2015-10-17 09:09:11,210 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: Namenode up at: master/192.168.2.1:9000
2015-10-17 09:09:11,213 INFO org.apache.hadoop.metrics.jvm.JvmMetrics: Initializing JVM Metrics with processName=NameNode, sessionId=null
2015-10-17 09:09:11,216 INFO org.apache.hadoop.hdfs.server.namenode.metrics.NameNodeMetrics: Initializing NameNodeMeterics using context object:org.apache.hadoop.metrics.spi.NullContext
2015-10-17 09:09:11,327 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: fsOwner=hadoop,hadoop
2015-10-17 09:09:11,328 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: supergroup=supergroup
2015-10-17 09:09:11,328 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: isPermissionEnabled=true
2015-10-17 09:09:11,340 INFO org.apache.hadoop.hdfs.server.namenode.metrics.FSNamesystemMetrics: Initializing FSNamesystemMetrics using context object:org.apache.hadoop.metrics.spi.NullContext
2015-10-17 09:09:11,342 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Registered FSNamesystemStatusMBean

ext object:org.apache.hadoop.metrics.spi.NullContext
2015-10-17 09:09:11,342 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Registered FSNamesystemStatusMBean
2015-10-17 09:09:11,423 ERROR org.apache.hadoop.hdfs.server.namenode.FSNamesystem: FSNamesystem initialization failed.
java.io.EOFException
at java.io.DataInputStream.readInt(DataInputStream.java:375)
at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:847)
at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:807)
at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:364)
at org.apache.hadoop.hdfs.server.namenode.FSDirectory.loadFSImage(FSDirectory.java:87)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.initialize(FSNamesystem.java:311)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.<init>(FSNamesystem.java:292)
at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:201)
at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:279)
at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:956)
at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:965)
2015-10-17 09:09:11,425 INFO org.apache.hadoop.ipc.Server: Stopping server on 9000
2015-10-17 09:09:11,429 ERROR org.apache.hadoop.hdfs.server.namenode.NameNode: java.io.EOFException
at java.io.DataInputStream.readInt(DataInputStream.java:375)
at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:847)
at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:807)
at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:364)
at org.apache.hadoop.hdfs.server.namenode.FSDirectory.loadFSImage(FSDirectory.java:87)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.initialize(FSNamesystem.java:311)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.<init>(FSNamesystem.java:292)
at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:201)
at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:279)
at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:956)
at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:965)

2015-10-17 09:09:11,430 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: SHUTDOWN_MSG:

/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at master/192.168.2.1
************************************************************/

解决办法：1.删除原来的/tmp目录，core-site.xml中所设置的目录

 　　　　　2.格式化：hadoop namenode -format