Hadoop - namenode 未启动 [英] Hadoop - namenode is not starting up

问题描述

我试图以 root 用户身份运行 hadoop，我在 Hadoop 文件系统运行时执行了 namenode 格式命令 hadoop namenode -format.

I am trying to run hadoop as a root user, i executed namenode format command hadoop namenode -format when the Hadoop file system is running.

此后，当我尝试启动名称节点服务器时，它显示如下错误

After this, when i try to start the name node server, it shows error like below

13/05/23 04:11:37 ERROR namenode.FSNamesystem: FSNamesystem initialization failed.
java.io.IOException: NameNode is not formatted.
        at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:330)
        at org.apache.hadoop.hdfs.server.namenode.FSDirectory.loadFSImage(FSDirectory.java:100)
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.initialize(FSNamesystem.java:411)

我试图寻找任何解决方案，但找不到任何明确的解决方案.

I tried to search for any solution, but cannot find any clear solution.

有人可以推荐吗?

谢谢.

推荐答案

酷，我找到了解决方案.

Cool, i have found the solution.

停止所有正在运行的服务器

Stop all running server

1) stop-all.sh 

编辑文件/usr/local/hadoop/conf/hdfs-site.xml，如果缺少则添加以下配置

Edit the file /usr/local/hadoop/conf/hdfs-site.xml and add below configuration if its missing

<property>
    <name>dfs.data.dir</name>
    <value>/app/hadoop/tmp/dfs/name/data</value> 
    <final>true</final> 
    </property> 
    <property> 
    <name>dfs.name.dir</name>
    <value>/app/hadoop/tmp/dfs/name</value> 
    <final>true</final> 
</property>

同时启动 HDFS 和 MapReduce 守护进程

Start both HDFS and MapReduce Daemons

2) start-dfs.sh
3) start-mapred.sh

然后现在运行其余的步骤来运行 此链接

Then now run the rest of the steps to run the map reduce sample given in this link

注意:如果直接命令没有运行，你应该运行命令 bin/start-all.sh.

Note : You should be running the command bin/start-all.sh if the direct command is not running.

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