NameNode未在伪分布式模式下启动

Question

我无法在hadoop fs-ls/命令上查看HDFS中的文件，我想这是因为name节点没有运行。我尝试了格式化namenode，并将core-site.xml中的端口更改为不同的值，但我的JPS没有列出namenode。

下面是这些文件：1）core-site.xml

               <configuration>
                       <property>
                       <name>hadoop.tmp.dir</name>
                       <value>/home/hduser/tmp</value>
                      <description>A base for other temporary directories.</description>
                        </property>
                         <property>
                         <name>fs.default.name</name>
                          <value>hdfs://localhost:50000</value>
                           <description>The name of the default file system. A URI whose
                          scheme and authority determine the FileSystem implementation. The
                          uri’s scheme determines the config property (fs.SCHEME.impl) naming
                           the FileSystem implementation class. The uri’s authority is used to
                                 determine the host, port, etc. for a filesystem.</description>
    </property>
    </configuration>

    <configuration>
                          <property>
                           <name>dfs.replication</name>
                              <value>1</value>
                              <description>Default block replication.
    The actual number of replications can be specified when the file is created.
    The default is used if replication is not specified in create time.
    </description>
    </property>
    <property>
         <name>dfs.name.dir</name>
        <value>/home/hduser/hadoop-1.2.1/data</value>
    </property>
    </configuration>

3）mapred-site.xml

                      <configuration>
                   <property>
         <name>mapred.job.tracker</name>
                           <value>localhost:54311</value>
             <description>The host and port that the MapReduce job tracker runs
                                 at. If “local”, then jobs are run in-process as a single map
                                 and reduce task.
                               </description>
                           </property>
                           </configuration>

JPS输出为：

21043作业跟踪器

20839数据阳极

Answer 1

如果再次发生相同的问题，则通过rm-rf tmp/从tmp文件夹中删除所有内容，然后格式化namenode，它就应该启动。或者您也可以尝试通过bin/hdfs namenode-recover恢复名称代码