Hadoop 0.20.2装配启动后 jps找不到NameNode 解决方案 单机伪分布式

Hadoop 0.20.2安装启动后 jps找不到NameNode 解决方案 单机伪分布式

cat hadoop-hadoop-namenode-ubuntu.log:

2013-01-19 00:34:55,812 ERROR org.apache.hadoop.hdfs.server.namenode.FSNamesystem: FSNamesystem initialization failed.

java.io.IOException: NameNode is not formatted.
    at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:317)
    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)
2013-01-19 00:34:55,813 INFO org.apache.hadoop.ipc.Server: Stopping server on 9000
2013-01-19 00:34:55,814 ERROR org.apache.hadoop.hdfs.server.namenode.NameNode: java.io.IOException: NameNode is not formatted.
    at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:317)
    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)

单击为分布式安装：

<configuration>
    <property>
        <name>dfs.replication</name>
        <value>1</value>
    </property>

     <property>  
      <name>dfs.permissions</name>  
      <value>false</value>  
     </property>  

    <property>
        <name>dfs.name.dir</name>
        <value>/home/hadoop/collector_3h/hadoop-0.20.2/hdfs/name</value>
    </property>

    <property>
        <name>dfs.data.dir</name>
        <value>/home/hadoop/collector_3h/hadoop-0.20.2/hdfs/data</value>
    </property>
</configuration>

解决方案：

直接删除namenode的配置文件目录,在重新format

1,rm -rf ../hdfs/na*

2,./hadoop namenode -format

再次jps

hadoop@ubuntu:~/collector_3h/hadoop-0.20.2/bin$ jps
15742 JobTracker
15662 SecondaryNameNode
15499 DataNode
15895 TaskTracker
15335 NameNode
16127 Jps
hadoop@ubuntu:~/collector_3h/hadoop-0.20.2/bin$

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